Comprehensive Glossary of Telecom Abbreviations and Acronyms

Table of Contents Preface ...

Author: Ali Akbar Arabi

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Table of Contents Preface ......................................................................................................

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Introduction .............................................................................................. xiii Acronyms and Abbreviations ...................................................................

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Annex A .................................................................................................... 383 Annex B .................................................................................................... 387

Preface Abbreviations are the important part of any scientiﬁc language of modern life. In recent decades, all branches of science have been widely expanded and many words and terms have been utilized to express their concept. Many of them are compound phrases and high-frequency terms, and if we use them as they are, our speech and writing becomes very lengthy and boring. That is why people prefer the short forms (abbreviations) for frequently used compound phrases. The main objective of technical abbreviations is to save time and decrease speech and writing to facilitate engineers’ communication. The other intention is the explicitness, ﬂuency, and beauty of our speech and writing. Any method, which can help us to achieve these goals, is acceptable. Abbreviations contribute to faster writing, reading, speaking, and better understanding of technical and scientiﬁc articles, reports, and lectures. They can save time and money by reducing the time and cost of writing, typing, editing, and composition resetting costs. They also reduce the space required for texts, tables, and diagrams. Therefore, they are very good tools to enhance any live and dynamic language. The words of the English and other European languages comprise a few special characters implying distinct technical meanings, such as l for wavelength or 4 for phase. In these languages, abbreviations play a similar role, but each of them implies the meaning of a “phrase” instead of a “word.” Thus, they can be considered as the elements of that language and are treated like the original words. Sometimes, the short form of a phrase is more common than that of its original form because they are very proper and effective tools for communication. In most languages, especially in English, coining abbreviations is a common practice and most of the high-frequency compound terms are used in short forms. For this reason, the abbreviations of a language are considered as “a language within that language”, and from the socio-linguistic point

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of view, they are comparable with a “dialect.” Therefore, utilization of abbreviations is inevitable and it is a wise decision to take action for their standardization. Without standard rules and principles, there will be many debates and discussions about writing style, when engineers are writing their manuscripts. To avoid these debates, it is recommended that writing principles and rules are formulated and standardized. With this in mind, I have followed the principles and rules adopted by John Markus, the composer of “Electronics Dictionary” as described in the fourth edition and recommend them to be standardized for international application. This book is entitled as “Comprehensive Glossary of Telecom Abbreviations”, but since each branch of science listed below are somehow interrelated and intermingled with telecommunications engineering, I have also included the abbreviations of those branches. The abbreviations listed in this work have been compiled over years from intensive study of various resources. A glossary of abbreviations is a growing work and will never be perfect and fully comprehensive. Despite this, I have tried all my best to include a collection of over 16,200 entries from almost all the ﬁelds of telecommunications, satellite communications, electronics, computer, Internet, broadcasting, ﬁber optics, information technology (IT), ICT, live Internet chat, e-learning, e-commerce, remote sensing, cellular networks, avionics, Ham radio, radar, and military communications terms to satisfy the needs of engineers, technical writers, technicians, and university students. Particular attention is paid to the abbreviations used in ITU, IMO, Intelsat, Inmarsat, and APSCC documents. Telecommunication magazines are not forgotten and many titles and volumes have been searched. You may also ﬁnd many abbreviations used in contracts and ﬁnancial documents. The most famous telecom companies and operators are included. A larger number of abbreviations made and used by the specialized institutions and standard organizations such as IEEE, ETSI, IETF, and ISO are also included. New technologies and systems such as ISDN, ATM, TMN, SONET, SDH, DECT, and Bluetooth are of special importance in this glossary. All entries are listed in alphabetical order. Where two or more entries differ only in capitalization or punctuation, the forms comprised of uppercased (capital) letters will follow the lowercased forms, and those having dots, slashes, or spaces precede the capital forms. Entries commencing with numbers are collected before all others. Where more than one phrase stand for a given abbreviation, both or all phrases are mentioned and marked by numbers. Entries of Greek symbols or letters are also alphabetized as if they were spelt out. Following the phrases, the relevant ﬁeld of each entry has also been shown in parentheses or

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brackets to clarify or limit the usage ﬁeld. If an entry does not fall into a speciﬁc category, the name of the company which coined that abbreviation is mentioned in parentheses. Ali Akbar Arabi

Acknowledgments My sincere gratitude goes to dear friends Abbas Pourkhesalian and Peyman Rezaee for their constructive help and valuable consultations. They contributed so much to solve and cope with the problems, which I faced while compiling this glossary.

Introduction STRUCTURE OF ABBREVIATIONS Abbreviation, in its simplest deﬁnition, is a shortened form of a word or phrase used mostly in writing to imply and represent the complete form of that word or phrase. There are many ways to build abbreviations for words or phrases which fall into eight main categories as follows. 1. Acronyms: The pronounceable abbreviations coined from the combination of the ﬁrst letters of each successive words of a compound term or phrase, as in radar, laser, maser, and sonar. The most common acronyms are normally written in lowercase letters and pronounced in the same way as the ordinary words. They may be either initially capitalized or set in all capitals in titles and headings. 2. Initials: A category of abbreviations in which the ﬁrst letters of a series of words are selected and spelt out letter by letter but are not separated by dots, as in ISDN, CDMA, and DWDM. 3. Blendings: Another category of abbreviations in which the ﬁrst syllables of two or three words are combined and pronounced as an ordinary word, such as codec for coder–decoder, modem for modulator–demodulator, and Inmarsat for International maritime satellite Organization. Other forms of blendings are made of the ﬁrst syllable of the ﬁrst word and the last syllable of the second word, such as netiquette, which stands for network-etiquette and webinar standing for Web-based seminar. 4. Clippings: A category of abbreviations in which some of the letters or sounds of a word are omitted and the key letters are combined, e.g., Bldg for building and MUX for multiplexer. 5. Truncations: A category of abbreviations in which a word is simply shortened by cutting off the ﬁrst or last syllable, such as phone for telephone, amp for ampliﬁer, and Fig for ﬁgure. For building such short forms, it is recommended to select at least three letters of the word.

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6. Contractions: A category of abbreviations in which the ﬁrst and last letters of a word is selected, such as Mr for Mister and Dr for Doctor. 7. Symbols: Single letters generally used to represent an element, a quality, a physical or numerical quantity, often appended with subscripts or superscripts to qualify their meaning, such as C for Capacitor and R for Resistor. Symbols may not be related to the words that they represent. Examples are C for speed of light in a vacuum, G for electrical conductance, H for magnetic ﬁeld strength, and L for inductance or an inductor. 8. Signs: A category of abbreviations which are printed or written ﬁgures (mostly Greek letters) each one conventionally stands for a word, phrase, or mathematical operation, e.g., U for ohm, F for phase, m for micro, l for wavelength, and 8 for degree. RULES FOLLOWED IN THIS GLOSSARY (Courtesy of John Markus and McGrawHill) Part A: Rules for abbreviations 1. All the abbreviations formed from ﬁrst letters of key words in a phrase are uppercased (capital) letters, except the units of measures which conform to the French SI units of measure adopted by the American National Standards Institute. There is another exception for the soundalike words, such as laser, maser, and radar, which are lowercased. 2. Abbreviations of phrases are generally pronounced letter by letter, but this is not a requirement for capitalizing. Thus, FET can be pronounced either letter by letter or as a word. Long abbreviations such as JFET and MOSFET are usually pronounced partially or entirely as words. 3. A Hyphen (-) is seldom used in abbreviations. When used, it will generally have one of the meanings represented by the slash. Thus, in A/D-D/A the hyphen stands for or, but in P-P it stands for -to-. 4. A hyphen should be used after an abbreviation when it is combined with another word to form a compound adjective, such as “JPEG-formatted picture.” 5. A hyphen should be used before an abbreviation when it is combined with another word to form a compound adjective, such as “BroadbandISDN.” 6. For plural forms of capital-letter abbreviations, especially the acronyms and blendings, regardless of whether in text or headings, same as the ordinary words, simply add a lowercase “s”, e.g., ICs, VSATs, FETs, RAMs, LEDs, SCRs, MICs, and PCBs. Same rule applies to plurals of numbers, e.g., 0s and 1s. 7. Use an apostrophe with the plurals of lowercase letters, as in “programming has two m’s.” 8. Use an apostrophe for the possessive form of a capital-letter abbreviation, as in “the SCR’s heat sink.”

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9. Use a space between a number and its abbreviated unit of measure in noun phrases, such as “5 kU and 100 VAR.” 10. Use a numerical exponent to indicate repetition of a letter in abbreviations for logic terms, such as T2L which stands for TTL. 11. A slash (/) generally means -to-, such as S/N (signal-to-noise). It will also have the meaning of per when it is used with letter symbols, such as kHz/s which stands for “kilo Hertz per second.” 12. Although the names of programming languages are acronyms and therefore are pronounced as words, it is now a common usage to type or print them in capital letters, e.g., ALGOL, COBOL, BASIC, and FORTRAN. 13. Do not italicize R, L, and C where they represent resistance or resistor, inductance or coil, and capacitance or capacitor, respectively. When R, L, and C are used in combination, run the letters together without hyphens, as in RC coupling and RLC circuit. Italicize these letters only in mathematical equations where they represent values of resistance, inductance, and capacitance, respectively, and in expressions like LC product, L /C ratio, and RC constant. Part B: Rules for SI Units of measure 1. When a letter symbol in SI system of units is derived from the name of a pioneer in the ﬁeld, capitalize the letter that represents the ﬁrst letter of the surname, such as “mF” which stands for microfarad. 2. Standard preﬁxes are used in lowercase letters as multipliers with the SI letter symbols. Note that only six largest preﬁxes have capital letters for their symbols, e.g., M for mega-, G for giga-, T for tera-, P for peta-, Y for yotta-, and Z for zetta-. 3. Letter symbols always represent both singular and plural forms of units of measure. Never add a lowercase “s” for plural because it represents seconds in the SI system of units. 4. Use an exponent after a length symbol to change it to an area or volume symbol. (The abbreviations sq for square and cu for cubic are used with SI units.) Pronunciation is unchanged; thus, in2 is pronounced “square inches” and in3 is pronounced “cubic inches.” 5. Use a space between a number and its abbreviated unit of measure in noun phrases. 6. Use a hyphen (-) between a number and its abbreviated unit of measure in compound adjectives, such as “a 20-kHz signal.” 7. Use a hyphen between two numbers that are the upper and lower limits of a range. In this case, the meaning of hyphen is “up to and including.” 8. Do not use a letter symbol without a numerical value. Spell out units of measure whenever they are used with words that represent approximations.

The Author Ali Akbar Arabi is a senior technical engineer with Inmarsat Mobile Satellite Communication Systems, handling the affairs of the Inmarsat network plus the IMSO and APSCC organizations in Iran. He holds degrees in Telecommunications Engineering and Marine Communications Engineering. He served for ﬁve years as “Radio Ofﬁcer” on board the Iranian Shipping lines, two years in Railway Communications, six years in Inmarsat satellites new systems, many years as the Inmarsat network operations coordinator of Iran, and now serves as the senior expert of satellites affairs for the Iranian Space Agency (ISA). As an author of ﬁve books, Mr. Arabi is a well-known name in the Iranian publisher’s society. In any Iranian public library you may ﬁnd one of his books. He holds membership in the Iranian Association of Electrical and Electronics Engineers (IAEEE), the Iranian branch of IEEE. He is also a member of the Academy of Persian Language and Literature on standardization of Persian scientiﬁc words. He has cooperated with the Institute of Standards and Industrial Research of Iran (ISIRI) in compiling the standards for Iranian telecom companies. He has invented a “home-based automatic earthquake alarm” and may be contacted at [email protected] .

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Acronyms and Abbreviations Numbers (0–9)

0 00 0RL 0TLP 1!EV-DO 1.44M 10/100 10BaseF 10BaseFP 10BaseT 10GBE 10GEA 100BaseFX 100BaseT 100BaseT2 14.4 16-QAM 1BL 1F4 1FB 1FL

The standard number dialed for accessing a local telephone company operator The standard number dialed for accessing an international telephone company operator Zero Relative Level (transmission) Zero Transmission Level Point (transmission) 1!Evolution-Data Optimized The capacity of high-density 3.5-inch ﬂoppy disks An Ethernet supporting 10 Mbps and 100 Mbps at same port A 10-Mbps Baseband Ethernet using Fiber-optic cabling (IEEE) A 10-Mbps Fiber-Passive Baseband Ethernet (IEEE) A 10-Mbps Baseband LANs using Twisted-pair cabling (IEEE) 10 Gigabit Ethernet (IEEE) 10 Gigabit Ethernet Alliance (IEEE) A 100-Mbps Baseband Fast Ethernet using multimode Fiberoptic cabling (IEEE) 100 Mbps, Baseband, Twisted pair (IEEE) 100 Mbps, Baseband, with two Twisted pair (IEEE) Having maximum data transfer rate of 14.4 kbps (modems) 16-state Quadrature Amplitude Modulation One Business Line (class of service) One Four-user party line (class of service) One Flat-rate Business phone line (class of service) One Family phone Line (class of service) 1

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1FR 1G 1MB 1MR 1NF 2-FSK 2/4-QPSK 21CN 23BCD 24!7 2B1Q 2BCD 2F 2FR 2G 2.5G 286 287 28.8 2NF 2W 3C 386 387 3B/2T 3D 3D API 3DES 3DGF 3FR 3G 3GL 3GPP 3GPP2 3GSM 3GTS 486 486DX 486SL 476SX 4B/3T 4B/5B 4-DEPSK 4F

One Flat-rate Residential phone line (class of service) First Generation (mobile phones) One Measured-rate Business phone line (class of service) One Measured-rate, Residential phone line (class of service) First Normal Form (computer database) Two-level FSK (modulation) Two Quadrature PSK (modulation) 21st Century Network Having 23 Bearer channels and one Data channel (ISDN) 24 Hours of a day, Seven days of a week (technical support) Two Binary, One Quaternary (ISDN) Having two Bearer channel and one Data channel (ISDN) Two-Fiber (line or cable) Flat-Rate party line having two subscribers (service code) Second Generation (mobile phones) Second-and-half Generation (mobile phones) A simple expression for Intel’s 80286 microprocessor A simple expression for Intel’s 80287 microprocessor Having a maximum transfer rate of 28.8 kbps (modems) Second Normal Form (computer database) Two-Wire (line or cable) An operating system developed by 3Com Company (networking) A simple expression for Intel’s 80386 microprocessor A simple expression for Intel’s 80387 microprocessor Three Binary bits encoded into two Ternary symbols Three-Dimensional 3D Application Programming Interface (computer) Triple Data Encryption Standard 3D Geometry File Flat-Rate party line having Three subscribers (service code) Third Generation (mobile phones) Third Generation Programming Language Third Generation Partnership Project (GSM) Counterpart of 3GPP responsible for CDMA-2000 (GSM) Third-Generation GSM Third-Generation Test System (Agilient Company) A simple expression for Intel’s 80486 microprocessor A simple expression for Intel’s 80486DX microprocessor A simple expression for Intel’s 80486SL microprocessor A simple expression for Intel’s 80476SX microprocessor 4 Binary bits encoded into 3 Ternary (data encoding) 4 Binary bits encoded into 5 Binary bits (data encoding) 4-phase Differentially-Encoded PSK (modulation) Four-Fiber (cable)

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Numbers (0–9)

4FR 4FSK 4G 4GL 4NF 4PDT 4PST 4W 4WL-WDM 5!5 5!B 56K 586 56 kbps 5B6B 5ESS 5NF 64 kbps 64QAM 6800 73 80286 80287 80386 80386DX 80386SL 80386SX 80387 80387SX 80486 80486SL 80486SX 8080 8086 8087 8088 88 8B/6T 8B/10B 8FR 8PSK 9600

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Flat-Rate party line having four subscribers (service code) Four-level FSK (modulation) Fourth-Generation (mobile phones) The Fourth-Generation Programming Language Fourth Normal Form (computer database) Four-Pole Double-Throw (switches) Four-Pole Single-Throw (switches) Four-Wire (line or cable) Four-Wavelength Wavelength-Division Multiplexing Five by Five (teletype communication) No. 5 CrossBar Circuit Switch Having a maximum data transfer rate of 56 kbps (modems) An unofﬁcial name for Intel’s Pentium microprocessor 56,000 Bits Per Second 5 Binary bits encoded into 6 Binary bits (data encoding) Number 5 Electronic Switching System (AT&T) Fifth Normal Form (computer database) 64,000 Bits Per Second 64-state Quadrature Amplitude Modulation An 8-bit microprocessor developed by Motorola Best Regards (Morse code transmissions) A 16-bit microprocessor developed by Intel A coprocessor for use with the 80286 microprocessors (Intel) See 80386DX A 32-bit microprocessor developed by Intel A microprocessor developed by Intel for laptop PCs A low-cost version of 80386DX microprocessor (Intel) A coprocessor for use with the 80386 microprocessors (Intel) A coprocessor for use with the 80386SX microprocessors (Intel) See i486DX See i486SL See i486SX One of the ﬁrst chipsets served as the basis of PCs The original microprocessor in the 80!86 family (Intel) A coprocessor developed by Intel for use with the 8086/8088 and microprocessors (Intel) The original microprocessor of the ﬁrst IBM PCs Love and Kisses (Morse code transmissions) 8 Binary bits encoded into 6 Tri-state symbols (data encoding) 8 Binary bits encoded into 10 Binary bits (data encoding) Flat-Rate party line having eight subscribers (service code) Octant Phase Shift Keying (modulation) Having a maximum data transfer rate of 9600 bps (modems)

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A

Aa

a A

A˚ A2DP A-BPSK A-QPSK A-TDMA A/D A/D-D/A A/m aA AA

AAA AAAC AAAI

Symbol for preﬁx atto-, denoting one-quintillionth or 10K18 1. Symbol for Ampere (electronics) 2. Symbol for Anode (electronics) 3. Symbol for Acceleration 4. Symbol for Area Symbol for Angstrom (unit of wavelength of light) Advanced Audio Distribution Proﬁle Aviation Binary Phase Shift Keying (modulation) Aviation Quadrature Phase Shit Keying (modulation) Advanced TDMA (access) Analog-to-Digital (converters) Analog-to-Digital or Digital-to-Analog (converters) Ampere per meter attoampere 1. Accounting Authority (Inmarsat) 2. Automated Attendant 3. Auto Answer (modems) 4. Access Adapter 1. Authentication, Authorization, and Accounting (LAN server) 2. ATM Access Adapter All Aluminum Alloy Cable American Association for Artiﬁcial Intelligence 5

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AAAS AABS AAC

AACR AACS AAIC AAL AAL-1 AAL-2 AAL-3/4 AAL-5 AAN AAP AAPI AAR AARP AARS AARTS AAS AATS AATSR AAV AB ABARIS ABC

American Association for the Advancement of Science Automated Attendant Billing System 1. Airline Administrative Communications 2. Aeronautical Administrative Communications 3. Augmentative and Alternative Communications (ICT) 4. Automatic Amplitude Control 5. Abbreviated Address Calling 6. Advanced Audio Codec 7. Access Authorization Certiﬁcate (Inmarsat) All America Cables and Radio, Inc. Attitude and Articulation Control Subsystem (spacecraft) 1. Accounting Authority Identiﬁcation Code (Inmarsat) 2. Active Addressing Integrated Circuit ATM Adaptation Layer ATM Adaptation Layer 1 ATM Adaptation Layer 2 ATM Adaptation Layers 3 and 4 ATM Adaptation Layer 5 Associated Account Number (wireless) 1. Application Access Point 2. Address Allocation Protocol 3. Alternative Access Provider Audio Application Programming Interface (computer) Automatic Alternate Routing (network feature) AppleTalk Address Resolution Protocol Asian Association of Remote Sensing Automatic Audio Remote Test Set 1. Authorized Application Specialist 2. Aeronautical Advisory Station Access Approval Test System Advanced Along-track Scanning Radiometer (remote sensing) Automated Address Veriﬁcation 1. Access Burst (GSM) 2. Additional Bits (MUX) 3. Asynchronous Balanced mode (OSI model) Advanced Broadband Architecture for Internet Services 1. Arbitration Bass Controller (electronics) 2. Automatic Bill Calling (payphone) 3. Automatic Bias Compensation (circuit) 4. Activity-Based Costing (ICT ﬁnance) 5. Automated Brightness Control (television) 6. Australian Broadcasting Corporation (TV broadcaster)

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Aa

ABCS ABD ABDN ABEC ABEL ABEND ABF ABI ABIOS ABIST ABM ABME ABN ABR abs ABS ABSBH ABT ABU ABUI ABX AC

AC/AC AC/DC ACA

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7. Armored Brush Cable 8. Automated Business Connection Advanced Business Communications via Satellite Average Business Day Attendant Blocking of Directory Number Alternate Billing Entity Codes Advanced Boolean Equation Language 1. Abnormal END (computer) 2. Abortive END Air-Blown Fiber Application Binary Interface Advanced BIOS (computer) Autonomous Built-in Self-Test 1. Asynchronous Balanced Mode (LANs) 2. Apogee Booster Motor Asynchronous Balanced Mode Extended abnormal (alarm status) 1. Available Bit Rate (ATM) 2. Area Border Router 3. Auto Baud Rate detect (data communications) absolute value (mathematics) 1. Alternate Billing Services (INs) 2. Average Busy Season 3. Aeronautical Broadcast Station Average Busy Season Busy Hour Advanced Broadcast Television about (Morse code transmissions) Asia-Paciﬁc Broadcasting Union Association of Banyan Users International Advanced Branch Exchange 1. Alternating Current (electronics) 2. Assignment Channel 3. Absorption Coefﬁcient (ﬁber optics) 4. Access Control (LANs) 5. Access Code 6. Acquisition Cycle 7. Authentication Center Alternating Current to Alternating Current (power) 1. Alternating Current to Direct Current (power) 2. Operating both with AC and DC power lines (equipment) 1. American Communication Association 2. Australian Communications Authority 3. Automatic Circuit Assurance (PBX feature)

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AcademNet ACAR ACARD ACARS ACAT ACATS ACB

ACC

ACCS ACCOLC ACCU ACCH ACD ACE ACEC ACELP ACeS ACF ACF/NCP ACF/VTAM ACFG ACG ACH ACI ACIA

Academic Research Network (Russia) Aluminum Conductor Alloy-Reinforced 1. Advisory Council for Applied Research and Development 2. Acquisition Card program ARINC Communications Addressing and Reporting System Additional Cooperative Acceptance Testing (test method) Advisory Committee on Advanced Television Service (standard) 1. Annoyance Call Bureau 2. Architecture Control Board 3. ATM Cell Bus 4. Automatic Callback 1. Analog Control Channel (wireless) 2. Area Control Center (COMSAR) 3. Authorization Control Center 4. Adaptive Cruise Control (car radar) 5. Automatic Callback Calling 6. Arthur C. Clarke Institute for Modern Technologies 1. Automatic Calling Card Service 2. Associated Common-Channel Signaling Access Overload Class Association of C and CCC Users Associated Control Channel (GSM) 1. Automatic Call Distributor (PBX) 2. Average Call Distance Automatic Cross-connection Equipment Advisory Committee for Electronics and Communications Algebraic Code Excited Linear Prediction (voice coding) Asian Cellular Satellite Advanced Communication Function (software) ACF Network Control Program (software) ACF Virtual Terminal Access Method (software) autoconfiguration (BIOS extensions) Automatic Call Gapping Attempts per Circuit per Hour (call centers) Adjacent Channel Interference Asynchronous Communications Interface Adapter (computer)

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ACID ACIF ACIR ACIS ACITS ACK ACL

ACLC ACLR ACM

ACMPA ACNA ACO ACON ACONet ACOST ACP

ACPI ACPR ACPW ACR ACRFNET ACS

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Atomic, Consistent, Isolation, Durable (database transaction) Australian Communications Industry Forum Adjacent Channel Interference Ratio (microwave) 1. Advanced Cargo Information System 2. Automatic Caller/Customer Identiﬁcation Service 3. Andy, Charles, Ian’s System (computer modeling) Advisory Committee on Information Technology Standardization acknowledge (control character) 1. Access Control List (networking) 2. Advanced CMOS Logic (digital electronics) 3. Application Connectivity Link (Siemens’ protocol) 4. Association for Computational Linguistics Adaptive Communication Line Converter Adjacent Channel Leakage Ratio (microwave) 1. Association for Computing Machinery 2. Automatic Call Manager 3. Address Control Memory 4. Address Complete Message (ATM) 5. Advanced Communications Function Aperture-Coupled Microstrip Patch Antenna (microwave) Access Customer Name Abbreviation 1. Additional Call Offering (ISDN) 2. Alarm Cut Off (MUX) Administrative Operating Company Number Academic Computer Network (Australia) Advisory Council on Science and Technology 1. Activity Concentration Point 2. Adjacent Channel Power (microwave) 3. Association of Computing Professionals 4. Azimuth Change Pulse Advanced Conﬁguration and Power Interface (computer) Adjacent Channel Power Ratio (microwave) Asymmetric Coplanar Waveguide (microwave) 1. Allowed Cell Rate (ATM) 2. Abandon Call and Retry 3. Attenuation to Crosstalk Ratio (transmission) Academic Computing Research Facility Network 1. Automatic Call Sequencer 2. Advanced Communication System (AT&T) 3. ATM Circuit Steering

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ACSB ACSE ACSL ACSnet ACSS ACT ACTA ACTAS ACTE ACTGA ACTIUS ACTL ACTOM ACTRIS ACTS

ACU ACUTA ACV ACWG ACWPBX AD ADA ADACC

4. Australian Computer Society Amplitute Compandored Single SideBand 1. Access Control and Signaling Equipment (Inmarsat) 2. Association Control Service Element (OSI model) Advanced Continuous Simulation Language (programming) Australian Computer Society national computer network Association of Computer Support Specialists 1. Applied Computer Telephony 2. Authorization Code Table 3. Association of Communications Technicians 1. America’s Carriers Telecommunications Association 2. Administrative Council for Terminal Attachments (FCC) Alliance of Computer-based Telephony Application Suppliers Approvals Committee for Terminal Equipment (GSM) Attendant Control of Trunk Group Access Association of Computer Telephone Integration and Users and Suppliers (U.K.) Access Customer Terminal Location (code) Advisory Committee on Technical and Operational Matters (ITU) Association for Cooperation in Telecommunications Research In Switzerland 1. Advanced Communications Technologies and Services 2. Advanced Communications Technology Satellite (NASA) 3. Association of Competitive Telecommunications Suppliers 4. Automatic Coin Toll Service 1. Antenna Control Unit (GSM) 2. Automatic Calling Unit (IBM) Association of College and University Telecommunications Administrators (standards organization) Advanced Common View Asymmetrical Coplanar Wave-Guide (microwave) Advanced Cordless Wireless Private Branch Exchange Administrative Domain 1. Average Delay to Abandon 2. ADA Lovelace Language (programming) Automatic Directory Assistance Call Completion

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ADAD ADAR ADAS ADB ADC ADCA ADCCP ADCU ADDMD ADE ADEOS ADF ADFOC ADH ADI ADIO ADK ADL ADLNet ADM ADMD ADML ADN ADNT ADO ADONIS ADP ADPCM ADPCOD ADPDEC ADPE ADPS ADPSSO

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Automatic Dialing and Announcing Device Advanced Design Array Radar Automated Directory Assistance Service (Northern Telecom) Apple Desktop Bus (Macintosh) 1. Analog-to-Digital Converter (electronics) 2. Automated Data Collection 3. Asia DAB Committee 1. Automatic Data Collection Association 2. Automatic Data Capture Association Advanced Data Communications Control Protocol (ANSI) Association of Data Communications Users Administrative Directory Management Domain (X.500) Above-Decks Equipment Advanced Earth Observing Satellite (remote sensing) 1. Automatic Direction Finder (equipment) 2. Automatic Document Feeder All Dielectric Fiber-Optic Cable 1. Average Delay to Handle 2. Automatic Data Handling Alternate Digit Inversion (data encoding) Analog/Digital Input/Output Application-Deﬁnable Keys Advanced Distributed Learning (e-learning) Advanced Distributed Learning Network (e-learning) 1. Adaptive Delta Modulation 2. Add and Drop Multiplexer (MUX) Administration Management Domain (X.400) Asymmetric Digital Microcell Link (Telcordia standard) Advanced Digital Network (Bell) Advanced Digital Network Trunking Auxiliary Disconnect Outlet Article Delivery Over Network Information Systems (ICT) Automatic Data Processor (computer) 1. Adaptive Differential PCM (modulation) 2. Association for Data Processing and Computer Management Adaptive Prediction Encoder Adaptive Prediction Decoder Automatic Data Processing Equipment Automatic Data Processing System Automatic Data Processing System Security Ofﬁcer

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ADQ ADR

ADRMP ADRT ADS

ADSI ADSL ADSP ADSR ADSTAR ADSU ADT ADTF ADTV ADU

ADX AE AEA AEB AEC AECS AECT AEEC

Average Delay in Queue 1. Achievable Data Rate 2. Aggregate Data Rate 3. Analog to Digital Recording 4. Alternate Destination Routing (AT&T) Auto-Dialing Recorded Message Player Approximate Discrete Radon Transform 1. Automatic Dependent Surveillance (aviation) 2. Automatic Data System 3. Advanced Design System (Agilient’s microwave) 4. Angular Displacement Sensor (remote sensing) 5. AudioGram Delivery Services (Nortel) Analog Display Services Interface (Telcordia standard) Asymmetric DSL (access) AppleTalk Data Stream Protocol (networking) Automatic Data Speed Recognition Automated Document Storage And Retrieval 1. ATM Digital Service Unit (ATM hardware) 2. Automatic Dependent Surveillance Unit (aviation) 1. Abstract Data Type 2. Audio, Data, and Teletext 3. Automatic Detection and Tracking (radar) ACR Decrease Time Factor Advanced Deﬁnition Television 1. Asynchronous Data Unit 2. Above-Deck Unit (satellite terminals) 3. Area Decision Unit (MUX) 4. Average Daily Use 5. Automatic Dialing Unit Automatic Data Exchange 1. Acoustic Emission 2. Application Entity (OSI model) 3. Account Executive 1. American Electronics Association 2. American Engineering Association 3. Aerial Experimental Association (Bell) Analog Expansion Bus (computer) 1. Acoustic Echo Canceller 2. Alternate Exchange Carrier Aeronautical Emergency Communications System (avionics) Association for Educational Communications and Technology Airlines Electronic Engineering Committee (ARINC)

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AEEM AEF AEGIS AEI AEJMC AEMIS AEP AER AEROSAT AEROTHAI AES

AESA AESS AET AEU

AEW AF AFACTS AFAQ AFAST AFC AFCEA AFDW AFE AFI

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Aerospace Engineering and Engineering Mechanics Aircraft Emergency Frequency 1. Advanced Electronic Guidance and Instrumentation System 2. Airborne Early-warning Ground Integration System Automatic Equipment Identiﬁcation Association for Education in Journalism and Mass Communication Automatic Electronic Management Information System (AT&T) AppleTalk Echo Protocol (networking) Advanced Edge Router Aeronautical Satellite Communications System Aeronautical Radio of Thailand 1. Aeronautical Earth Station (Inmarsat) 2. Audio Engineering Society 3. Advanced Encryption Standard 4. Application Environment Standard (or Service) Active Electronically Steered Array (microwave antennas) Aerospace and Electronics System Society Application Entity Title (OSI model) 1. Auxiliary Electronics Unit 2. Aircraft Early Warning 3. Airborne Early Warning 4. Asia Electronic Union 1. Aircraft Early Warning 2. Airborne Early Warning 1. Audio Frequency 2. Assigned Frame (Motorola) Automatic Facilities Test System French Quality Assurance Association Advanced Flyaway Satellite Terminal 1. Automatic Frequency Control (electronics) 2. Amplitude-to-Frequency Converter 3. Advanced Fiber Communications Armed Forces Communications and Electronics Association Active Framework for Data Warehousing 1. Analog Front End (functions) 2. Antiferroelectric 1. Authority and Format Identiﬁer (ATM) 2. Address and Format Identiﬁer (OSI model)

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AFIPS AFIS AFM AFMR AFN AFNOR AFOSR AFP AFPCON AFRN AFRS AFRTS AFS

AFSK AFT AFTN AFTRA AFV AG AGC AGCH AGCOMNET AGE AGN AGP AGPS AGRS AGT AGTK AGU

American Federation of Information Processing Societies 1. Airborne Flight Information System 2. Automated Fingerprint Identiﬁcation System (Motorola) 1. Adobe Font Manager 2. Adobe Font Metrics 3. Antiferromagnetism Antiferromagnetic Resonance Aeronautical Fixed Network (COMSAR) Association Franc¸aise de Normalization (France) Air Force Ofﬁce of Scientiﬁc Research (U.S.A.) AppleTalk Filing Protocol (networking) AFP Conﬁguration (Novell NetWare) Armed Forces Radio Network (broadcaster) Armed Forces Radio Service (broadcaster) American Forces Radio and Television Services (broadcaster) 1. Advanced Freephone Service 2. Andrew File System (networks) 3. Aeronautical Fixed Service (ITU) 4. Automation File Server Audio Frequency-Shift Keying (modulation) Automatic Fine Tuning (receivers) Aeronautical Fixed Telecommunications Network (COMSAR) American Federation of Television and Radio Artists Audio-Follow-Video Application Generator (software) 1. Automatic Gain Control (electronics) 2. Audio Graphic Conferencing Access Grant Channel (GSM) Agriculture’s voice and data Communications Network (U.S.A.) Aerospace Ground Equipment again (Morse code transmissions) Accelerated Graphics Port (Intel motherboards) Assisted GPS Air-Ground Radiotelephone Service (aviation) 1. Audio Graphics Terminal 2. Albera Government Telephone Application Generator Toolkit 1. Address-Generation Unit 2. Automatic Ground Unit

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AGW AGWCS Ah AH AHD AHDL AHDS AHEN AHF AHFG AHP AHR AHT .aif AI AIA AIC AICC AICE AID AIDA AIDC AIDS AIEE AIFF AIIA AIIM AILS AIM

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Access Gateway (switching) Air-Ground Worldwide Communications System (aviation) Ampere-hour Authentication Header (IP datagrams) Audio High-Density (recording) Analog Hardware-Description Language (software) Arts and Humanities Data Service (ICT of JISC committee) 1. Alabama Home Educator’s Network (U.S.A.) 2. Alberta Higher Education Network (e-learning) 3. Alternative Higher Education Network (e-learning) Adaptive High-Frequency (radio) ATM-attached Host Functional Group Authentication Header Protocol Ampere Hour 1. Average Handle Time 2. Average Holding Time Name extension for Audio Interchange Files (computer) 1. Artiﬁcial Intelligence 2. Airborne Interception (radar) 3. Action Indicator (ISDN) 1. Aerospace Industries Association (U.S.A.) 2. Application Interface Adapter 3. Automatic Internet Administration 1. Automatic Intercept Center (Telcordia Technologies) 2. Analog Interface Circuit (modem) 1. Automatic Incoming Call Connection 2. Autonomous Intelligent Cruise Control (car radar) Australian Institute of Computer Ethics Access Identiﬁer (MUX) Accessible Information on Development Activities Automatic Identiﬁcation and Data Collection (Mexico) Access Identiﬁer System American Institute of Electrical Engineers (now IEEE) Audio Interchange File Format Australian Information Industry Association Association for Information and Image Management Advanced Integrated Landing System (ICT) 1. Amplitude Intensity Modulation 2. Ascend Inverse Multiplexing (protocol) 3. Association for Interactive Media 4. ATM Inverse Multiplexer 5. Access Intelligent Multiplexer

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AIMS AIMUX AIN AINC AINTCC AIOD AIP AIR

AIRB AIRF AIRS AIS

AISS AIST AISTel AIT

AITP AITS

AIW AIX AJ AJP AKM

1. Aeronautical Interim Monitoring System 2. Auto Indexing Mass Storage ATM Inverse Multiplexer Advance Intelligent Network Arabic Internet Names Consortium Automated Intercept Call Completion (Northern Telecom) Automatic Identiﬁcation of Outward Dialing (PBX) ATM Interface Processor 1. Allowed Information Rate (frame relay) 2. Additive Increase Rate (ATM) 3. Airborne Imaging Radar 4. All India Radio (broadcaster) 5. Association of Independents in Radio 6. Air-Incident Recording (magnetic storage) Association of Radio Industries and Businesses Additive Increase Rate Factor (ATM) Atmospheric Infrared Sensor (remote sensing) 1. Alarm Indication Signal (MUX) 2. Automatic Intercept System 3. Automated Information System 4. Aeronautical Information Services (COMSAR) 5. Association for Information Systems Automated Information Systems Security Agency of Industrial Science and Technology Associazione Italiana per lo Sviluppo delle Telecomunicazioni 1. Assembly, Integration, and Testing 2. Atomic International Time 3. Advanced Intelligent Tape (tape format) 4. Automatic Identiﬁcation Technology Association of Information Technology Professionals (U.S.A.) 1. Australian Information Technology Society 2. Administrative Information Technology Services 3. Advanced Information Technology Services 4. Associazione Italiana Tecnici del Suono 5. Acknowledged Information Transfer Service Application Implementer’s Workshop Advanced Interactive executive (IBM-operating system) Anti-Jamming (electronics) American Journal of Physics Apogee Kick Motor (satellite)

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AL ALAP ALB ALBO ALC ALDC ALE

ALF ALFA ALG ALGaAs ALGOCOM ALGOL ALI ALIS ALIT ALL ALLC ALM ALMRBS ALMRS ALN AlNiCo ALOS ALPETH ALPS ALS ALT

ALTEL

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1. Adaptation Layer (ATM) 2. Application Layer (OSI model) AppleTalk Link Access Protocol Analog Loop-Back (testing) Automatic Line Build-Out (transmission) 1. Automatic Level Control 2. Automatic Load Control (ﬁber optics) 3. Airline Line Control (protocol) Adaptive Lossless Data Compression 1. Application Logic Element 2. Automatic Link Establishment (HF radio station) 3. Atlanta Linux Enthusiasts 4. Approvals Liaison Engineer (British) Advanced Library Format Automatic Laser-Fiber Assembly Application Level Gateway Aluminum–Gallium–Arsenide (semiconductors) Algorithm Communications Company (Iran) Algorithmic Language (programming) 1. ATM Line Interface 2. Automatic Location Identiﬁcation 3. Automatic Location Information Access Line In Service Automatic Line Insulation Testing Analog Leased Line Association for Literary and Linguistic Computing 1. AppWare Loadable Module 2. Automated Loan Machine Airport Land Mobile Radio Base Station (aviation) Airport Land Mobile Radio Station (aviation) 1. Asynchronous Learning Networks (e-learning) 2. Adaptive-Logic Network (neural networks) Aluminum Nickel Cobalt (substance) Advanced Land Observing Satellite Aluminum/Polyethylene (cable) Automatic Loop Protection Switching 1. Automatic Laser Shutdown 2. Advanced Low-power Schottky (TTL) 3. Active Line State 1. Automated Loop Test 2. Association for Learning Technology (U.K. e-learning) 3. Alternate Local Transport Association of Long-distance Telephone companies

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ALTS ALU AM

AM band AM-AM AM-PM AM-TFT AM/FM AM/SSB AM/VSB AMA AMADNS AMANDA AMAP AMATPS AMBA AMBE AMC AMCs AMD AMDM AME AMEL AMES AMF AMHS AMI AMIS AML

Association for Local Telecommunications Services (U.S.A.) 1. Arithmetic and Logic Unit (computer) 2. Average Line Utilization 1. Amplitude Modulation 2. Angle Modulation 3. Access Module 4. Apogee Motor (satellite) 5. Active Matrix (displays) 6. Alarm Management Radio-frequency band ranging from 535 to 1605 kHz Amplitude-Modulation to Amplitude-Modulation conversion Amplitude-Modulation to Phase-Modulation conversion Active Matrix, Thin-Film Transistor Handling either AM or FM signals (radio receivers) Amplitude-Modulation with Single SideBand operation Amplitude-Modulation with Vestigial SideBand operation Automatic Message Accounting AMA Data Networking System (OSS) Automated Messaging And Directory Assistance Adaptive Mobile Access Protocol AMA Teleprocessing System (OSS) Advanced Microcontroller Bus Architecture Advanced Multiband Excitation (Inmarsat) Allgon Mobile Communications (Sweden) Adds, Moves, and Changes (IBM-speak about computer fan) American Micro Devices (company) ATM Multiplexer/Demultiplexer 1. Amplitude Modulation Equivalent (transmission) 2. Automatic Message Exchange Active Matrix Electroluminescence Aeronautical Mobile Earth Station 1. Apogee Motor Firing (satellite) 2. Automated Module Fabrication Automated Message-Handling System 1. Alternate Mark Inversion (data encoding) 2. Active Microwave Instrument (remote sensing) Audio Messaging Interchange Speciﬁcation (voice mail) 1. Actual Measured Loss

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AMLCD AMN Amp AMP amplidyne AmprNet AMPS AMPSSO AMR

AMRAC AMS AMS-IX Amsat AMSC AMSK AMSS AMT AMTA AMTFT AMTI AMTOR AMTS AmTV AMVER AN ANA ANAC Anamux ANBP

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2. Automatic Modulation Limiting (electronics) 3. Amplitude Modulated Link 4. Analog Microwave Link 5. ARC Macro Language (programming) Active Matrix Liquid-Crystal Display Abstract Machine Notation 1. Ampere 2. ampliﬁer Advanced Metal Powder (storage technology) ampliﬁer dyne Amateur packet radio Network 1. Advanced Mobile Phone Service (cellular networks) 2. Automatic Message Processing System Automatic Message Processing System Security Ofﬁcer 1. Anisotropic Magneto-Resistance 2. Automated Meter Reading 3. Audio Modem Riser (Intel motherboards) 4. Adaptive Multirate (codec) Association Mondale des Radiodiffuseurs Communautaires (France) 1. Account Management System 2. Attendant Management System (NEC) 3. Aeronautical Mobile Service (COMSAR) Amsterdam Internet Exchange Radio Amateur Satellite Corporation American Mobile Satellite Corporation Auxiliary Manual Select Keyboard 1. Aeronautical Mobile Satellite Service (COMSAR) 2. Airborne Multispectral Scanner Address Mapping Table (routers and servers) American Mobile Telecommunications Association Active-Matrix Thin-Film Transistor (electronics) Airborne Moving-Target Indicator Amateur Teleprinting Over Radio 1. Automated Maritime Telecommunications System 2. Asia-Paciﬁc Mobile Telecommunications Satellite Pte. Ltd Amateur Television Automated Merchant Vessel Report Access Network Automatic Network Analyzer Automatic Number Announcement Circuit Analog multiplexer AppleTalk Name-Binding Protocol

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ANC ANCARA AND ANI ANL ANM ANN ANOVA ANRT Ans ANS ANSA ANSI ANSI-C ANSI/SPARC ANT

ANTC ANTIVOX ANX AO AO/DI AoC AOC AoCI AoCC AOCN AOCS AoD AOHell AOL

1. All Number Calling 2. Air Navigation Commission (COMSAR) Advanced Networked Cities And Regions Association Automatic Network Dialing (service) Automatic Number Identiﬁcation (feature) 1. Automatic Noise Limiter 2. Ambient Noise Level Answer Message 1. Artiﬁcial Neural Network 2. Arab News Network Analysis of Variance Agence Nationale de Reglementation des Telecommunication (Morocco) answer 1. Advanced Network and Services 2. American National Standards Alternate Network Service Agreement (ISDN) American National Standards Institute (U.S.A.) A version of C programming language standardized by ANSI ANSI Standards Planning And Requirements Committee 1. antenna 2. Antenna Noise Temperature 3. Advanced Network Technologies (company) 4. Access Network Termination 5. Alternate Number Translation Advanced Networking Test Center Anti-voice-Operated Transmission (electronics) Automative Network Exchange Acoustic-Optical Always On Dynamic ISDN Advice of Charge (GSM supplementary service) Aeronautical Operational Communications Advice of Charge Indication (GSM supplementary service) Advice of Charge Charging (GSM supplementary service) Administrative Operating Company Number Altitude and Orbit Control System Audio-on-Demand (service) America Online Hell (hacker program) America Online (information service)

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AOM AON AOR AOR-E AOR-W AOS AOSP AOSS AOSSVR AOTF AOW AP

APA APAD APAN APaRT APC

APCC APCN APCO APCS APD APDC APDIP APDU APES APEX APFD API

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1. Acousto-optic Modulator 2. Administration, Operations, and Maintenance 1. Active Optical Network 2. All-optical Network Atlantic Ocean Region (Inmarsat) Atlantic Ocean Region-East (Inmarsat) Atlantic Ocean Region-West (Inmarsat) 1. Alternate Operator Services 2. Area of Service Alternate Operator Service Provider Auxiliary Operator Services System Auxiliary Operator Services System Voice Response Acoustic Optical Tunable Filter (MUX) Asia and Oceania Workshop 1. Access Point (wireless LAN) 2. Access Provider 3. Anomalous Propagation 4. Application Program 5. Applications Processor (AT&T) 6. Adjunct Processor All Points Addressable (graphics) Asynchronous Packet Assembler/Disassembler Asia-Paciﬁc Advanced Network (consortium) Automated Packet Recognition/Translation 1. Adaptive Predictive Coding 2. Automatic Phase Control (electronics) 3. Advanced Process Control 4. Aeronautical Passenger Communications 5. Association for Progressive Communications American Public Communications Council Asia-Paciﬁc Cable Network (consortium) Association of Public-safety Communications Ofﬁcials (U.S.A.) Aeronautical Public Correspondence Service Avalanche Photo Diode (electronics) Avalanche Photodiode Coupler Asia-Paciﬁc Development Information Program (United Nations) Application Protocol Data Unit (OSI model) Antenna Pointing Element Set (Satcom) Application Exchange (protocol) Aggregate Power Flux Density 1. Application Programming Interface (software) 2. Advanced Publication of Information (Intelsat) 3. Air Position Indicator

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API/CS APK APL APLT APM APNIC APO APOLT APON APONT APOT app APP APPA APPC APPGEN APPN APR APRN APS

APSC APSCC APSE APSI APSK APSW APT APTS AQAP AQCB AQL AR

Application Programming Interface and Communications Service Amplitude Phase-Shift Keying (modulation) 1. Array Programming Language (computer) 2. Automatic Program Load (PBX feature) 3. Average Picture Level (video system) Advanced Private Line Termination (PBX) 1. Amplitude Phase Modulation 2. Advanced Power Management (computer) Asia-Paciﬁc Network Information Center Adaptive Performance Optimization (technology) APON Line Termination ATM Passive Optical Network APON Termination (electronics) Additional Point of Termination application Ascend Password Protocol American Public Power Association Advanced Program-to-Program Communications (IBM) Application Generator Advanced Peer-to-Peer Networking (IBM SNA) 1. American Public Radio (broadcaster) 2. Annual Percentage Rate (contracts) Alaska Public Radio Network (broadcaster) 1. Advanced Photo System 2. Advanced Planning and Scheduling (ICT) 3. Automatic Protection Switching (MUX) 4. Analog Protection System (broadcasting) Asia-Paciﬁc Space Center, Inc. (U.S.A.) Asia-Paciﬁc Satellite Communications Council Automatic Protection Switching Extendable Asia-Paciﬁc Satellite Industries Co., Ltd Amplitude PSK (modulation) All Purpose Software 1. Asia-Paciﬁc Telecommunity (organization) 2. Automatically Programmed Tools 3. Automatic Picture Transmission Association of Public Television Stations Allied Quality Assurance Publications Automated Quote Contract Billing Acceptable Quality Level (of products) 1. Axial Ratio (microwave) 2. Alternate Route 3. Automatic Recall

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ARA Arabsat ARAM ARB .arc ARC ARCH ARCI ARCNet ARCS ARD ARE ARENA ARES ARF ARFA ARFCN ARI ARIB ARIES ARIN ARINC ARISE ARISS ARISTOTELES .arj .ARJ ARL ARLE ARM

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1. AppleTalk Remote Access 2. Address Resolution Advertisement (routing service) Arab Satellite Communications (organization) Audio grade RAM (memory) All-Routes Broadcast Name extension for compressed archive ﬁles (computer) Attached Resource Computer (LANs) Access Response Channel (wireless) Amateur Radio Club International Attached Resource Computer Network Astra Return Channel System 1. Advanced Research and Development 2. Automatic Ring Down All-Routes Explorer (ATM) Automated Resource to Electronic Navigation Archive Amateur Radio Emergency Service (organization) 1. Alternative Regulatory Framework 2. Alternate Recovery Facility (Satcom) Arrested Receive Frame Acquisition Absolute Radio Frequency Channel Number (GSM) Automatic Room Identiﬁcation (telephony service) Association of Radio Industries and Businesses ( Japan) 1. Angle-Resolved Ion and Electron Spectroscopy 2. Australian Resource Information and Environment Satellite American Registry for Internet Numbers (U.S.A.) Aeronautical Radio Incorporated (airline consortium) 1. Advanced Radio Interferometry between Space and Earth 2. American Renaissance in Science Education Amateur Radio International Space Station Applications and Research Involving Space Technologies Observing The Earth’s Fields from Low Earth-orbiting Satellites A DOS ﬁle extension for ARJ compression program Name extension for Achieving program by Robert K. Jung (computer) Acceptable Reliability Level (of products) Advanced Run-length Limited Encoding (data storage) 1. Asynchronous Response Mode (OSI model) 2. American Radio Museum 3. Answering and Recording Machine 4. Apogee Rocket Motor (satellite)

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ARMIS ARNS ARNSS ARO AROS ARP ARPA ARPANet ARPM ARPU ARQ ARQ-GB ARQ-SR ARQ-SW ARR ARRL ARRN ARS ARSG ARSR ART ARTES Artron ARU AS

AS&C ASA

ASAI ASAM ASAPI ASAR ASARS

Automated Management Reporting Information System Aeronautical Radio Navigation Service (ITU) Aeronautical Radio Navigation-Satellite Service (ITU) Active Resonant Oscillator (microwave) 1. Amateur Radio Observation Service 2. Amiga Research Operating System 1. Address Resolution Protocol (networking) 2. Azimuth Reference Pulse 1. Advanced Research Projects Agency (U.S.A.) 2. Automatic Radar Plot Aid (shipboard radar) ARPA Network Average Revenue Per Minute (GSM) Average Revenue Per User (GSM) Automatic Retransmit Request (data communication) Automatic Retransmit Request - Go Back Automatic Retransmit Request - Selective Retransmit Automatic Retransmit Request - Stop and Wait Airborne Radio Relay American Relay Radio League Amateur Radio Repeater Network Automatic Route Selection/Selector Australian Radiocommunications Study Group Air Route Surveillance Radar Arab Radio and Television network (broadcaster) Advanced Research in Telecommunications Systems Artiﬁcial Neuron Audio Response Unit 1. Autonomous System 2. Amateur Satellite 3. Applicability Statement 4. Advanced Schottky (microchips) 5. Authorization Stream 1. Alarm Surveillance and Control 2. Advanced Systems and Concepts (U.S. Defense) 1. Acoustical Society of America 2. American Standards Association (now ANSI) 3. Average Speed of Answer 4. Afﬁliated Sales Agency Adjunct Switch Application Interface (AT&T) Advanced Services Access Manager (Alcatel) Advanced Speech API (computer) Advanced Synthetic Aperture Radar Advanced Synthetic Aperture Radar System

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ASAS ASBC .asc ASC

ASCA ASCC ASCENT ASCII ASCU ASD ASDE ASDS ASDSP ASE ASFB ASG ASH ASI

ASIC ASK ASL ASMTP ASN

ASOCNet ASON ASP

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All-Source Analysis System Advanced Space Business Corporation Name extension for ﬁles containing ASCI text (computer) 1. Abnormal Station Code 2. AUTODIN Switching Center 3. Automatic Slope Control (circuitry) 4. Advanced Switching Communications 5. Aeronautical System Center (U.S.A.) Advanced Satellite for Cosmology & Astrophysics Automatic Sequence Controlled Calculator Association of Communications Enterprises American Standard Code for Information Interchange (computer) Agent Set Control Unit (IBM) Asynchronous Data Airport Surface Detection Equipment Accunet Spectrum of Digital Services (AT&T) Application-Speciﬁc Digital Signal Processor 1. Application Service Element (OSI model) 2. Ampliﬁed Spontaneous Emission 3. Automatic Switching Equipment Application-Speciﬁc Functional Block Access Service Group 1. Ardire-Stratigakis-Hayduk (algorithm) 2. Ampliﬁer-Sequenced Hybrid (microwave) 1. Alternate Space Inversion (data encoding) 2. Artiﬁcial Sensing Instrument 3. Application Software Interface 4. Astronomical Society of India 5. Agenzia Spaziale Italiano (Italian Space Agency) Application-Speciﬁc Integrated Circuits (electronics) Amplitude-Shift Keying (modulation) Adaptive Speed Leveling (modem) Authenticated SMTP (Internet) 1. Aeronautical Satellite News (magazine) 2. Acknowledgement Sequence Number 3. Autonomous System Number 4. Abstract Syntax Notation (OSI model) Army Special Operations Command Network Automatically-Switched Optical Network 1. Application Service Provider (Internet) 2. Administrable Service Provider (SCSA) 3. Alternate Service Provider

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ASPI ASPJ ASQ

ASR

ASRM ASRT ASS ASSP ASSTA AST ASTAP ASTC ASTD ASTE ASTERR ASTM ASTP ASTRAL

4. Abstract Service Primitive (ATM) 5. Adjunct Service Point (INs) 6. Analog Signal Processing 7. AppleTalk Session Protocol (networking) 8. Average Selling Price (microchip manufacturing) 9. ATM Switch Processor 10. Attached Support Processor (Northern Telecom) 11. Association of Shareware Professionals 12. Active Server Page (HTML) Advanced SCSI Programming Interface (computer) Advanced Self-Protection Jammer (electronics) 1. Automated Status Query 2. Administrative Science Quarterly 3. American Society for Quality 4. Application Status Query 1. Automatic Send/Receive (telex maker company) 2. Automatic Speech Recognition (telephony service) 3. Automatic System Reconﬁguration (computer) 4. Access Service Request (frame relay) 5. Airport Surveillance Radar 6. Answer Seizure Ratio 7. Average Service Rate (percentage) Automatic Send/Receive Monitor (ASR company product) Automatic Send/Receive Terminal (ASR company product) Amateur Satellite Service (ITU) 1. Acoustic Speech and Signal Processing 2. Application-Speciﬁc Standard Product (microchips) Australian Speech Science and Technology Association Automatic Scheduled Testing APT Standardization Program (APT) 1. Australian Science and Technology Council 2. Association of Science-Technology Centers Incorporated American Society of Training and Development (e-learning) Advanced Systems and Telecommunications Equipment Advanced Spaceborne Thermal Emission Reﬂectance Radiometer (remote sensing) American Society for Testing and Materials Advanced Systems and Technology Program Alliance for Strategic Token-Ring Advancement and Leadership

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ASU ASV ASWC .asx ASYNC AT

AT Attachment AT&T ATA

ATA2 ATACS ATAPI ATB ATC ATCA ATCON ATCONFIG ATCP ATCRBS ATD ATDE ATDM ATDNet ATDP ATDRSS ATDT ATE

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1. Application-Speciﬁc Unit 2. ATM Service Unit Air-to-Surface-Vessel (radar) Alternate Serving Wire Center Name extension for Windows Media Player ﬁles (computer) Asynchronous (data transfer) 1. Advanced Technology (IBM PCs) 2. Access Tandem 3. Acceptance Test 4. Audiotex(t) 5. Asynchronous Transmission Advanced Technology Attachment (interface standard) American Telephone and Telegraph (company) 1. Air Transport Association 2. Auto-Tracking Antenna 3. American Telemarketing Association (U.S.A.) 4. Analog Terminal Adapter (Northern Telecom) 5. AT Attachment (computer interface) Second generation AT Attachment (interface standard) Army Tactical Communications System (U.S.A.) ATAttachment Packet Interface speciﬁcation (CD-ROM) All Trunks Busy (signal) 1. Air Trafﬁc Control (aviation) 2. Adaptive Transform Coding Antique Telephone Collectors Association AppleTalk network Control (Novell NetWare) AppleTalk Conﬁguration (Novell NetWare NLM) AppleTalk Control Protocol Air Trafﬁc Control Radar Beacon System 1. Asynchronous Time-Division 2. Advanced Technology Demonstration 3. Attention Dial the phone (modems) Adaptive Time Domain Equalizer Asynchronous Time-Division Multiplexing Advanced Technology Demonstration Network Attention Dial Pulse (modem command) Advanced Tracking and Data Relay Satellite System (NASA) Attention Dial Tone (modem command) 1. Authorized Telecommunications Entity 2. Automatic Test Equipment

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ATEL ATELP ATF ATG ATHD ATI ATIA ATIS ATL ATM

ATM DSU ATM DXI ATM-25 ATMARP ATMP ATN ATNS ATOF ATOP ATOW ATP

ATPC ATPG ATPS ATPSCON ATRAC ATRAN ATS ATSC ATSE

Advanced Television Evaluation Laboratory Adaptive-Transform-Excited-Linear Prediction Advanced Tactical Fiber 1. Address Translation Gateway (Cisco) 2. Automatic Test Generation 3. Air-To-Ground (service) Average Ten High-Day (data communication) 1. Advanced Telecommunication Institute 2. Accelerated Technology Incorporated Air Trafﬁc Interface Application (Motorola) Alliance for Telecommunications Industry Solutions (U.S.A.) Active Template Library (Microsoft) 1. Asynchronous Transfer Mode (network technology) 2. Air Trafﬁc Management (aviation) 3. Automated Transaction Machine 4. Automatic Tracking Mechanism ATM Digital Service Unit ATM Data Exchange Interface ATM running at 25 Mbps ATM Address Resolution Protocol Ascend Tunnel Management Protocol Aeronautical Telecommunications Network Advanced Trunking Networking System Advanced Tactical Optical Fiber Automatic Trafﬁc Overload Protection (feature) Acquisition and Tracking Order-Wire 1. AppleTalk Transaction Protocol (networking) 2. Acceptance Test Procedure 3. Advanced Technology Provider 4. Automatic Telephone Payment Automatic Transmitter Power Control Automatic Test Pattern Generator (broadcasting) AppleTalk Print Services (Novell NetWare) AppleTalk Print Services Conﬁguration (Novell NetWare) Adaptive Transform Acoustic Coding (minidisk) Automatic Terrain Recognition And Navigation (military) 1. Air Trafﬁc Services (aviation) 2. Abstract Test Suite (testing a protocol) 3. Applications Technology Satellite program Advanced Television Systems Committee (U.S.A.) Academy of Technological Sciences and Engineering

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ATSR ATSR/M ATT ATTC ATTND ATU

ATU-C ATU-R ATUC ATUG ATV ATVEF ATX AU AU PTR AuC AUCS AUD AUG AUI AUP AUR AURP AUS AUSREP AUSSAT Auto-SD Auto-SF AUTODIN AUTOEXEC AUTOSEVOCOM AUTOVON AUU

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1. Along-Track Scanning Radiometer (remote sensing) 2. Along-Track Scanning Radar Along-Track Scanning Radiometer Microwave (sounder) 1. Automatic Toll Tracking 2. Average Talk Time Advanced Television Test Center attendant 1. ADSL Transceiver Unit (ITU) 2. ADSL Terminal Unit 3. Auxiliary Test Unit 4. African Telecommunications Union ADSL Transmission Unit-Central ofﬁce ADSL Transmission Unit-Remote ofﬁce ADSL Transmission Unit-Central ofﬁce Australian Telecommunication User Group 1. Advanced Television (HDTV) 2. Amateur Television Advanced Television Enhancement Forum 1. Audiotex(t) 2. Advanced Technology Expanded (PC motherboards) 1. Access Unit 2. Alternate Use 3. Administrative Unit (MUX) Administrative Unit Pointer (MUX) Authentication Center (GSM) AT&T Unisource Communications Services Audio input/output (audio systems) Administrative Unit Group (MUX) 1. Autonomous Unit Interface (Ethernet transceiver) 2. Attachment Unit Interface (Ethernet transceiver) 3. Access Unit Interface (LANs) Acceptable Use Policy (ISPs) Access Usage Record AppleTalk Update-based Routing Protocol Access Unit Subrack Australian Ship Reporting system Australian domestic Satellite operator Automatic Signal Degrade (MUX) Automatic Signal Failure (MUX) Automatic Digital Network (U.S. Defense) Automatically Executed (computer command) Automatic Secure Voice Communication network Automatic Voice Network (U.S. Defense) ATM User-to-User (bit)

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A

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

AUUG AUX AUXBC .av AV AVC AVD AVE AVHRR .avi AVI AVIOS AVK AVL AVNIR AVRS AVSG AVSS AVSSCS AWA AWACS AWAN AWC AWCC AWG AWGN AWM AWNV AWSI AX.25 A!E AZ AZ/EL AZON AZRAN

Australian Unix User Group 1. Auxiliary Device (computer serial port or COM1) 2. Auxiliary signal (audio systems) Auxiliary Broadcasting Name extension for Audio–Visual ﬁles (computer) Audio–Visual Automatic Volume Control (electronics) Alternative Voice/Data (transmission) Automatic Volume Expander (electronics) 1. Advanced Very High-Resolution Radiometer (remote sensing) 2. Advanced Very High-Resolution Radar Name extension for audio–visual ﬁles (computer) 1. Audio–Video Interleave (ﬁle format) 2. Automatic Vehicle Identiﬁcation 3. Analog VHDL International (standards group) American Voice Input/Output Society Audio–Video Kernel (digital video) Automatic Vehicle Location (GSM) Advanced Visible and Near Infrared Radiometer Automated Voice Response System Advanced Video Systems Group (Canada) Audio–Video Support System (digital video) Audio/Visual Service-Speciﬁc Convergence Sublayer (ATM) Antique Wireless Association Airborne Warning And Control System Analog Wide Area Network 1. Area-Wide Centrex 2. Association for Women in Computing Afghan Wireless Communications Company 1. American Wire Gauge (cable standards) 2. Arbitrary Waveform Generator Additive White Gaussian Noise American Wiring Material All Weather and Night Vision System Association of Wireless System Integrators Amateur-radio implementation of X.25 Automatic Cross-connection Equipment Azimuth (Satcom) Azimuth and Elevation (Satcom) Azimuth Only (Satcom) Azimuth and Range (radar)

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B

Bb b b/s B

B channel B Link B&S B&W BC BK B-CDMA B-DCS B-ICI B-ICISAAL B-ISDN B-ISUP B-LLI B-LT

1. Symbol for bit (unit of data) 2. Symbol for baud (unit of character transmission) 3. Symbol for barn (unit of nuclear cross section) bits per second 1. Symbol for Byte 2. Symbol for Base (transistor circuit diagrams) 3. Symbol for Bel (unit of measure of signal strength) 4. Symbol for magnetic ﬂux density 5. Symbol for Beta (Beta test) Bearer channel (ISDN) Bridge Link (SS7) Brawn and Sharp Gauge Black and White (television set) Positive terminal of Battery or voltage source Negative terminal of Battery or voltage source Broadband CDMA (access) Broadband Digital Cross-connect System B-ISDN Inter Carrier Interface (ATM) B-ICI Signaling ATM Adaptation Layer Broadband ISDN Broadband ISDN User’s Part (SS7) Broadband Lower Layer Information Broadband Line Termination 31

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

B-MAC B-NT B-PCS B-Picture B-QSIG B-Sat B-TA B-TE B2B B2C B2E B2G B3ZS B6ZS B8ZS BA BAA BABT BACP BACR BAF BAFTA BAIC .bak Balun BAN BAOC BAOL BAPCO BAPTA BARITT BARS BAS BASIC BASR .bat

Broadband Master Antenna Control Broadband Network Termination Broadband Personal Communications Services (FCC) Bi-directionally predictive-coded Picture (MPEG) Broadband ISDN Q-interface Signaling Broadcasting Satellite system Corporation ( Japan) Broadband Terminal Adapter (ISDN) Broadband Terminal Equipment (ISDN) Business-to-Business (e-commerce) Business-to-Consumer (e-commerce) Business-to-Employee (e-commerce) Business-to-Government (e-commerce) Bipolar with 3 Zeros Substitution (data encoding) Bipolar with 6 Zeros Substitution (data encoding) Bipolar with 8 Zeros Substitution (data encoding) 1. Basic Access 2. Burst Acquired 3. Business Address Blanket Authorization Agreement British Approvals Board for Telecommunications Bandwidth Allocation Control Protocol Billing Account Cross Reference (number) Bellcore AMA Format (data) British Academy of Film and Television Arts Billing of All Incoming Calls (GSM supplementary service) Name extension for backup ﬁles (computer) Balanced-input to unbalanced-output converter (microwave) 1. Base Area Network 2. Billing Account Number Billing of All Outgoing Calls (GSM supplementary service) British Association for Open Learning (e-learning) British Association of Public-safety Communications Ofﬁcials Bearing And Power Transfer Assembly Barrier Injection Transit Time (semiconductors) Basic Automatic Route Selection (Nortel Networks) Bit Allocation Signal Beginner’s All-purpose Symbolic Instruction Code (computer) Buffered Automatic Send/Receive Name extension for batch program ﬁles (computer)

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Bb

BAT Batelco BATT BAW BB BBC BBD BBE BBER BBEXP BBG BBG-I BBIN BBIU BBL BBLAN BBM BBN BBPULB BBS BBSS BBT BBTM BBU BBUL Bc BC

BCC

BCCH

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Bouquet Association Table Bahrain Telecommunications Company (operator) battery (diagrams) Bulk Acoustic Wave (HF device) 1. Baseband signal (MUX) 2. Bulletin Board 3. Broadband 1. British Broadcasting Corporation (broadcaster) 2. Broadband Bearer Capability 3. Back-to-Back Connection Bucket Brigade Device (semiconductors) Background Block Error (MUX) 1. Bulletin Board Error Rate 2. Background Block Error Ratio Baseband Expansion Basic Business Group ISDN Basic Business Group Broadband Intelligent Network Baseband Interface Unit Broadband Loop Baseband Local Area Network Breadboard Model Bolt, Beranek, and Newman, Inc. (company) Big Brother Protects You from Little Brothers (wireless networks) 1. Bulletin Board System (ICT) 2. Bridge-to-Bridge Station Baseband Sub-System 1. Broadband Transmission (Intelsat) 2. Bit-Block Transfer Beam-to-Beam Trafﬁc Matrix (Intelsat) Baseband Unit (Intelsat) Bumpless Build-Up Layer packaging Committed Burst size 1. Backward Compatible (coding and softwares) 2. Beam Coupling 3. Binary Code 4. Broadcast 1. Blind Carbon Copy (e-mail) 2. Base-station Color Code (GSM) 3. Bellcore Client Company 4. Block Check Character 5. Broadcast Control Computer Broadcast Control Channel (cellular networks)

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B

34

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

BCD BCE BCH BCHO BCI BCL BCM

BCN BCOB BCOB-A BCOB-C BCOB-X BCP BCR BCRI BCRS BCS

BCSM BCVT Bd BD BDC BDCS BDD BDE BDF

1. Binary-Coded Decimal (coding) 2. Burst Channel Demodulator Bandwidth-Control Element (frame relay) 1. Bose, Chaudhuri, and Hocquenghem code (error correction) 2. Broadcast Channels (GSM) Base-Controlled Hand-Off (cellular networks) 1. Broadcast Interference 2. Bit Count Integrity Base general premises Cabling License (Australia) 1. Bit-Compression Multiplexer 2. Basic Call Model (AINs) 3. Block-Coded Modulation 4. Binary Coded Matrix (Intelsat) Beacon (navigation) Broadband Connection-Oriented Bearer (ATM) BCOB Class A (ATM) BCOB Class C (ATM) BCOB Class X (ATM) 1. Batch Change Supplement 2. Best Current Practice 3. Bulk Copy Program (software) Binary Charge Regulator Business Communications Review International (magazine) Bell Canada Relay Service 1. Basic Control System (Satcom) 2. Batch Change Supplement 3. Boston Computer Society 4. B-channel Circuit-Switched 5. Basic Combined Set (OSI model) 6. British Computer Society 7. Beam Control System (satellite) 8. Broadcast Control System Basic Call State Model (AINs) Basic Class Virtual Terminal (OSI model) baud (unit of telex transmission speed) Building Distributor 1. Backup Domain Controller (server) 2. Broadband Digital Cross-connect Broadband Digital Cross-connect System (MUX) Binary Decision Diagram Below-Decks Equipment Block Data Format

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Bb

BDFB BDI BDLC BDN BDR BDSL BDT BDU BE BEAMOS BEARS BECN BECTA BEDO RAM BEEP BEF BEHINCOM BEI Bellcore BeOS BEP BER BERT BES BETA BETRS BeV BEX BEZS BFI BFICC BFL BFN BFO BFOC BFOG

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Breaker Distribution Fuse Bay (switch room) Bearing Deviation Indicator Burroughs Data Link Control (protocol) Bell Data Network Battery Discharge Regulator Broadband DSL (access) 1. Billing Data Tape 2. Binary Decision Tree 3. Telecommunications Development Bureau (France) Below-Decks Unit (satellite terminals) Burst Excess Beam-associated MOS (semiconductors) Billing Exchange Account Record System Backward Explicit Congestion Notiﬁcation (frame relay) British Educational Communications and Technology Agency of United Kingdom (e-learning) Burst Extended Data Output RAM (memory) Block Extensible Exchange Protocol Band Elimination Filter Behin Ertebat Mehr Company (Iran) Back-scattered Electron Imaging Bell Communications Research (company) Be Operating System (Be, Inc.) 1. Bit Error Probability 2. Back End Processor 1. Bit Error Rate (transmission) 2. Bit Error Ratio (transmission) 3. Basic Encoding Rules Bit Error Rate Test (transmission) 1. Base Earth Station 2. BlackBerry Enterprise Server Business Equipment Trade Association Basic Exchange Telecommunications Radio Service Billion electron Volts (power) Broadband Exchange Bandwidth Efﬁcient Zero Suppression Bad Frame Indicator (GSM) British Facsimile Industry Consultative Committee Buffered FET Logic (digital electronics) Beam-Forming Network (microwave) Beat-Frequency Oscillator (electronics) Bayonet Fiber Optic Connector Brillouin Fiber Optic Gyroscope

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

BFSK BFSL BFT BG BG/BARC BG/P BG/T BGA BGAN BGE-I BGID BGMP BGND BGP BGP4 BH BHC BHCA BHCC BHCR BHLI BHM BHMC Bi-directional BIA BIB BIBO BIC BIC-Roam BICC BICI BiCMOS BICSI BID BIDDS BiDi BIDOPS

Binary FSK (modulation) Best-Fit Straight Line (error measurement) 1. Binary File Transfer (computer) 2. Batch File Transmission (computer) 1. Basic Group 2. Board of Governors (Intelsat) BG Budget and Account Review Committee (Intelsat) BG Planning committee (Intelsat) BG Technical committee (Intelsat) Ball-Grid Array (microchips) Broadband Global Area Network (Inmarsat) ISDN Business Group Elements Business Group ID (ISDN) Border Gateway Multicast Protocol Background Border Gateway Protocol (routing) Border Gateway Protocol version 4 (router) Bandwidth Hog Backbone to Horizontal Cross-connect Busy Hour Call Attempts (GSM) Busy Hour Call Completion (GSM) Busy Hour Call Rate Broadband High-Layer Information (ATM) Busy Hour Minutes Busy Hour Minutes of Capacity Radiating or sensitive to two directions Burned In Address (LANs) 1. Backward Indicator Bit (SS7) 2. British Interactive Broadcasting Bounded Input, Bounded Output Barring of Incoming Calls (GSM supplementary service) Barring of Incoming Calls while Roaming (GSM service) Bearer Independent Call Control Broadband Inter-Carrier Interface Bipolar CMOS (semiconductors) Building Industry Consulting Service International (standards) Bridge Identiﬁcation Code Base Information Digital Distribution System (military) bi-directional (transmission) Bi-Doppler Scoring (military)

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Bb

BIDS BIE BiFET BIFODEL BIG BIGA BIH BII .bin BINAC BIND BIOD BIOS BIP BIP-8 BIP-N BIP-RZ BIF-L BIS BISDN BISSI BIST BISYNC bit bit/s BIT BITBLT BITE BITNet BITNIC BITS BITT BIU BIX BJT

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Broadband Infrastructure for Digital TV and multimedia Services Base station Interface Equipment Bipolar FET (semiconductors) Binary Fiber-Optic Delay Line Broadband Integrated Gateway Bus Interface Gate Array (microchips) Bureau International del’Heure Base Information Infrastructure Name extension for ﬁles encoded with Mac Binary (computer) Binary Automatic Computer project Berkley Internet Name Daemon (Novell NetWare) Bell Integrated Optical Device Basic Input Output System (computer) 1. Bit Interleaved Parity (data encoding) 2. Billing Interconnection Percentage 3. Band Interleaved by Pixel (remote sensing) Bit Interleaved Parity 8 (data encoding) Bit Interleaved Parity N (data encoding) Bipolar-Return to Zero level (data encoding) Biphase-Level (data encoding) 1. Business Information System 2. Border Intermediate System 3. Broadband Interactive System Broadband ISDN Broadband Inter Switching System Interface Built-in Self-test (operation) Binary Synchronous Control (protocol) binary digit bits per second Built-In Test BIT Block Transfer (Microsoft Windows) 1. Backward Interworking Telephony Event 2. Built-in Test Equipment Because It’s Time Network (WANs) BITNet Network Information Center 1. Base Information Transport System (U.S. Air force) 2. Building Integrated Timing Supply (clock) BIT Transparent 1. Basic Information Unit (IBM SNA) 2. Bus-Interface Unit Byte Information Exchange (Byte magazine) Bipolar Junction Transistor (semiconductors)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

BK BL BLAM BLAS BLEC BLER BLERT BLES BLF BLIP BLISS BLOB BLOS BLP BLR BLSR BLT BLU BM BMC BMEC BMEWS BMIGRATE BMLC BMMG .bmp BMP BMR BMTI BN BNA BNAP BNC

break (Morse code transmissions) 1. Business Line 2. Bit Line Binary Logarithmic Access Method Basic Linear-Algebra Subprogram (software) 1. Broadband Local Exchange Carrier 2. Building Local Exchange Carrier Block Error Rate Block Error Rate Test/Tester (data transmission) Broadband Loop Emulation Services Busy Lamp Field Bluetooth’s Local Information Points (bluetooth) Broadband Lightwave Source System Binary Large Objects (data type) Beyond Line-of-Sight (microwave) Block Loss Probability (transmission) 1. Branch Level Revenue 2. Block Loss Ratio (transmission) Bidirectional Line-Switched Ring Block Line Transfer Basic Link Unit 1. Balanced Modulator 2. Buffer Memory 3. Burst Modem 1. Business Management Computer 2. Broadband Management Controller Batelco Middle East Company (Bahrain) Ballistic Missile Early Warning System A program used to migrate from Banyan VINES operating system to Novell Netware 4.1 (networking) Basic Mode Link Control (OSI model) British Minicomputer Manufacturing Group Name extension for bitmap format ﬁles (graphics) Basic Multilingual Plane 1. Bit Mis-delivery Ratio (transmission) 2. Block Mis-delivery Ratio (transmission) Block Mode Terminal Interface 1. Bridge Number 2. Border Node 3. Background Noise 1. Burroughs Network Architecture 2. Billing Name and Address Broadband Network Access Point (British Telecom) 1. British Naval Connector (cables)

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Bb

BNCC BNR BNSC BNT BO BOB BOC BOE BOF BOFH BOIC BOIC-exHC BOL BOLT BOM BONAPARTE BONDING BONT BootP BOP BOS BOSS bot BOT BP

BP14 BPAD BPCS BPDU BPF Bpi BPM

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2. Bayonet-coupling Navy Connector 3. Bayonet-coupling Nut Connector Base Network Control Center Bell-Northern Research (Northern Telecom) British National Space Centre (England) Broadband Network Termination Back-Off Break-Out Box testing device (transmission) 1. Bell Operating Company 2. Business Ofﬁce Code Buffer Overﬂow Error Business Operations Framework (wireless) Bastard Operator From Hell (network language) Barring of Outgoing International Calls (GSM service) BOIC except the Home Country (GSM service) Beginning of Life Broadband Optical Line Termination 1. Beginning of Message (ATM) 2. Bill of Materials (contracts) 3. Basic Operations Monitor Broadband Optical Network using ATM PON Access facilities in Realistic Telecommunications Environment Bandwidth On Demand Interoperability Group Broadband Optical Network Termination Bootstrap Protocol (TCP/IP) 1. Bit-Oriented Protocol 2. Biocomputing Ofﬁce Protocol 3. Beginning of Packet Bill Output Speciﬁcations Billing and Order Support System robot Build, Operate, and Transfer (GSM contracts) 1. Band-Pass 2. By-Pass 3. Base Pointer 4. Beam Position 5. Block Pair (telephone wire) Body Part 14 Bisynchronous Packet Assembler/Disassembler Broadband Personal Communications Standards Bridge Protocol Data Unit (ATM) Band-Pass Filter Bytes per inch (recording surface) Beam Position Monitor

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BPON bpp BPP BPR bps BPS BPSK BPU BPV BQM BQOS BR

BRA BRADS BRC BRCS BRDF BREW BRF Brg BRI BRIDS BRISC BRL BRM BRS BRTC BRTM BS

BSA

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Broadband Passive Optical Network bits per pixel (digital images) Brokered Private Peering (industry plan) Business Process Reengineering bits per second 1. By-Pass 2. B-Channel Packet-Switched Binary PSK (modulation) Boundary Processing Unit Bipolar Violation (data encoding) Business Quality Messaging Business Quality of Service 1. Beacon Receiver 2. Bureau of Radiocommunications 3. Back-Reﬂection 4. Bit Rate Basic Rate Access (ISDN) Bell Rating Administrative Data System (Telcordia Technologies) Bus Repeater Card Business and Residence Customer Service Bidirectional Reﬂectance Distribution Function (remote sensing) Binary Run-time Environment for Wireless (Qualcom) Band-Rejection Filter bridge (circuits) 1. Basic Rate Interface (ISDN) 2. Basic Rate ISDN (service) Bellcore Rating Input Database System Bell-Northern Research Reduced Instruction Set Computing Balance Return Loss Bus Repeater Module 1. Buried Ridge Stripe 2. Big Red Switch (computer) Bus Repeater Terminating Card Bus Repeater Terminating Module 1. Back-Space (character control code) 2. Base Station 3. Bearer Service (ISDN) 4. Beam Splitter 5. Back Scatter 6. Broadcasting Service (ITU-T) 1. Basic Switching Arrangement

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Bb

BSAC BSACE BSAM BSC BSCC BSD UNIX BSDL BSE

BSF BSFOCS BSFT BSGL BSHR BSI BSIC BSIS BskyB BSL BSMS BSMTP BSN BSO BSOC BSOD BSP BSQ BSR BSRF BSS

BSSAP BSSMAP

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2. Basic Serving Arrangement (OSI model) Bit-Sliced Arithmetic Coding Billing System ACE Basic Sequential Access Method 1. Binary Synchronous Communications (protocol) 2. Binary Symmetric Channel 3. Base Station Controller (GSM) Bell South Cellular Corporation Berkeley Software Distribution UNIX Boundary-Scan Description Language (software) 1. Broadcasting Satellite Experiment ( Japan) 2. Back-Scattered Electrons 3. Basic Switching Element (networking) 4. Basic Service Element (voice processing) Band Stop Filter (electronics) Black Sea Fiber Optic Cable System (cable consortium) Byte Stream File Transfer Branch Systems General License (British) Bidirectional Self-Healing Ring British Standards Institution (U.K.) Base Station Identity Code (GSM) Branch Sales Information System British Sky Broadcasting (TV broadcaster) British Sign Language (programming) Broadcast Short Message Service (GSM) Batch Simple Mail-Transfer Protocol Backward Sequence Number (GSM) Bit Synchronous Operation (SONET) Battery State-of-Charge Black Screen of Death (windows error message) 1. Bell System Practice 2. Byte Stream Protocol Band Sequential (remote sensing) 1. Bit Scan Rate 2. Bit Scan Reverse Bell System Reference Frequency 1. Broadcast Satellite Services (ITU) 2. Boeing Satellite Systems 3. Base Station Subsystem (GSM) 4. Broadband Switching System 5. Business Support System 6. Basic Synchronized Set (OSI model) Base Station Subsystem Application Part (GSM) Base Station Subsystem Mobile Application Part (GSM)

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BSTCE BSU BSVC BT

BTA

BTag BTAM BTB BTBT BTE BTI BTL

BTM BTMU BTN BTO BT BTP BTR BTRL BTS BTSM BTSO BTU BTV

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Base Station Terminal Control Element 1. Beam Steering Unit 2. Burst Synchronization Unit Broadcast-Switched Virtual Connections 1. British Telecom (company) 2. Base Transceiver (GSM) 3. Burst Tolerance (ATM) 4. Bit Time 5. Television Broadcasting service (ITU-T) 1. Basic Trading Area (cellular networks) 2. Broadband Telecommunications Architecture 3. Broadband Terminal Adapter 4. Business Technology Association (standard organization) Beginning Tag (ATM) Basic Telecommunications Access Method (IBM) Book-To-Bill (ratio) Band-To-Band Tunneling 1. Boltzmann Transport Equation 2. Broadband Terminal Equipment British Telecom International 1. Bell Telephone Laboratories 2. British Telecommunications Laboratories 3. Backplane Transceiver Logic (electronics) 4. Bipolar Transistor Logic Broadband Transport Manager Bit Transport Master Unit Billing Telephone Number 1. Built To Order (PC makers) 2. Bandwidth Trading Organization 3. Bombing Through Overcast (military) British Telecom Burst Time Plan 1. Bit Timing Recovery 2. Block Transfer Rate 3. British Telecom Requirement British Telecom Research Laboratories 1. Base Transceiver Station (GSM) 2. Bit Test and Set Base Transceiver Station Management (wireless) Bit Transport Slave Optical 1. Basic Transmission Unit 2. British Thermal Unit Business Television

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Bb

BU BUFF BUNI BURBON BUS BVA BVR BVS BW BWA BWF BWFN BWG BWM BWO Byte BZT

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Baseband Unit buffer Broadband User Network Interface Broadband Urban Rural-Based Open Networks Broadcast and Unknown Server Billing Validation Application database (AT&T) Beyond Visual Range Billing Validation Service (AT&T) bandwidth (parameter) 1. Broadband Wireless Access 2. Backward-Wave Ampliﬁer (electronics) Broadcast Wave Format Beam Width, First Nulls (antennas) Beam Wave-Guide (antenna) BandWidth Management System Backward-Wave Oscillator (electronics) Binary Term Bundesamt fu¨r Zulassungen in der Telecommunikation (German)

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B

C

Cc c

cc C/I Ratio c/in c/s C

C&C C&D C&DH C&IT C&W

1. Symbol for preﬁx centi-, denoting one-hundredth or 10K2 2. Symbol for character 3. Symbol for cycle 4. Symbol for a constant value (mathematics) cubic centimeter Carrier-to-Interference Ratio characters per inch 1. characters per second 2. cycles per second 1. Symbol for Capacitor or Capacitance (electronics) 2. Symbol for Coulomb (unit of electric charge) 3. Symbol for Collector (transistor circuit diagrams) 4. Symbol for Celsius (temperature unit) 5. Symbol for speed of light in a vacuum 6. A programming language 1. Computer and Communications 2. Command and Control Control and Display Control and Data Handling (Intelsat) Communications and Information Technology (same as ICT) Cable and Wireless 45

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

CK CC CCC C-AFM C-band C-channel C-DTE c-HTML C-Net C-To-L C/A C/DTAC C/I C/IM3 C/IMo C/Io C/M C/N C/No C/R C/S C/T C2 C2B C2C C2G C2L C3 C3L C3Po C4 C4I C7 C64 CA

Symbol for negative terminal of a C battery or voltage source Symbol for positive terminal of a C battery or voltage source An extension of C programming language Calibrated Atomic Force Microscope Radio frequency band ranging from 4 to 6 GHz Circuit-mode channel Character mode DTE (computer) Compact HTML Coaxial Network C-band to L-band Clear and Acquisition Code (GPS) Customer Disability Telecommunications Advisory Committee Carrier-to-Interference power (ratio) Carrier-to-3rd Order Inter modulation Ratio (Intelsat) Carrier-to-Inter modulation noise density ratio (Intelsat) Carrier-to-Interference power spectral density ratio (Intelsat) Carrier-to-Multipath power (ratio) Carrier-to-Noise power (ratio) Carrier-to-Noise power spectral density (ratio) Command Response (frame relay) Call Sign (navigation) Carrier-to-noise Temperature (ratio) Command and Control system (military) Consumer-to-Business (e-commerce) Consumer-to-Consumer (e-commerce) Consumer-to-Government (e-commerce) Close Complementary Logic (digital electronics) Command, Control, and Communications system (military) Complementary Constant-Current Logic (digital electronics) Cisco 3 Port switch Command, Control, Communications, and Computers Command, Control, Computer, Communications, and Intelligence The European version of SS7 Commodore 64 1. Communication Agent 2. Conditional Access

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Cc

CAA CAAGR CaAs .cab CAB CableLabs CABS CABS BOS CAC

CACH CACM CACS CAD CAD/CAM CADA CADB CADC CADD CADS CAE CAFA CAG CAGR CAI

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3. Call Appearance 4. Cell Allocation (GSM) 5. Certiﬁcate Authority (digital certiﬁcate) 1. Civil Aviation Administration or Authority 2. Computer-Assisted Assessment (ICT) 3. Collinear Antenna Array Compound Annual Average Growth Rate Cadmium–Arsenide (semiconductors) Name extension for cabinet ﬁles (computer) Canadian Association of Broadcasters Cable Television Laboratories, Inc. (standards organization) Carrier Access Billing System CABS-Billing Output Speciﬁcations 1. Customer Administration Center 2. Carrier Access Code 3. Call Admission Control (ATM) 4. Connection Address Control Call Appearance Call Handling (ISDN) Communications of the Association for Computing Machinery Centralized Alarm Control System 1. Computer-Aided Design (ICT) 2. Computer-Aided Drafting (ICT) 3. Computer-Aided Dispatching (ICT) Computer-Aided Design /Computer-Aided Manufacturing (ICT) Computer-Aided Design and Analysis (ICT) Calling Area Database (MCI) Control And Display Console (Intelsat) Computer-Aided Design and Development (ICT) 1. Code Abuse Detection System 2. Computer Abuse Detection System 1. Computer-Aided Engineering (ICT) 2. Common Applications Environment (ICT) Computer-Aided Financial Analysis 1. Customer Activation Group (Inmarsat) 2. Conditional Access Gateway 3. Computer-Aided Graphics (ICT) Cumulative Annual Growth Rate (ﬁnance) 1. Computer-Aided Instruction (ICT) 2. Common Air Interface (GSM) 3. Conﬁguration and Alarm Interface

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C

48

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

CAIS cal CAL CALC CALEA CALLUM CALNet CALS CALSCH CAM

CAMA CAMA-ONI CAMA/LAMA CAMAC CAMEL CAMP CAMC CAN CanISDN CAO CAP

CAPC Capex

Conditional Access Interface Server calorie (unit of heat) 1. CAN Application Layer 2. Computer-Aided Learning (e-learning) 3. Computer-Assisted Learning (e-learning) Customer Access Line Charge Communications Assistance to Law Enforcement Act Combined Analog Locked-Loop Universal Modulator California Network 1. Continuous Acquisition and Life-cycle Support (EDI) 2. Computer-aided Acquisition and Logistics Support (EDI) Calendaring and Scheduling working group of the IETF 1. Computer-Aided Manufacturing (ICT) 2. Computer-Assisted Makeup (ICT) 3. Carrier Module 4. Controlled Attachment Module (LANs) 5. Content-Addressable Memory 6. Conditional Access Module (TV viewing card) 7. Call Accounting Manager 8. Call Application Manager Centralized Automatic Message Accounting CAMA-Operator Number Identiﬁcation CAMA Logical Automatic Message Accounting Computer-Aided Measurement And Control (ICT) Customized Application for Mobile network Enhanced Logic Channel Ampliﬁer Conditional Access Management Center (television) 1. Control Area Network 2. Controller Area Network 3. cancel (character control code) Canadian ISDN Computer-Assisted Ordering (ICT) 1. Competitive-Access Provider 2. Client Access Protocol 3. Carrierless Amplitude and Phase modulation 4. Cellular Array Processor (Fujitsu) 5. Conditional Access Packet (EMM) 6. CAMEL Application Part Competitive Access Provider Capacity (transmission speed) Capital expenditures

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Cc

CAPI CAPIMS CAPP Caps CAPS CAPTAIN CAPWIRE CAR CARAB CARE CARE/ISI CAROT CARP CARS CAS

CASBAA CASC CASE

CAST Cat CAT

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1. Cryptography Application Program Interface 2. Common-ISDN API Conditional Access Program Information Management System Computer-Aide Process Planning (ICT) 1. Call Attempts Per Second 2. Capital letters (keyboard) 1. Code Abuse Prevention System 2. Competitive Access Providers (telephone network) Character And Pattern Telephone Access Information Network Capitol Wireless Inc. (company) Computer-Aided Retrieval (ICT) Canadian Amateur Radio Advisory Board Customer Account Record Exchange CARE Industry Standard Interface Centralized Automatic Reporting On Trunks (test & maintenance) Cache Array Routing Protocol Cable Television Relay Service 1. Channel Associated Signaling 2. Centralized Attendant Service 3. Communications Applications Speciﬁcation 4. Conditional Access Segment (TV broadcasting) 5. Collision Avoidance System (electronics) 6. Column-Address Strobe (memory chip logic signal) Cable And Satellite Broadcasting Association of Asia Communications Air Support Center 1. Computer-Aided Software Engineering (ICT) 2. Computer-Assisted Software Engineering (ICT) 3. Computer-Aided System Engineering (ICT) 4. Computer-Assisted System Engineering (ICT) 5. Common Application Service Elements 1. Computer-Aided Software Testing (ICT) 2. Computer-Assisted Software Testing (ICT) category (cable standard) 1. Computer-Aided Teaching (e-learning) 2. Computer-Aided Testing (ICT) 3. Computerized Axial Tomography (medicine) 4. Conditional Access Table 5. Council for Access Technologies 6. Communications Authority of Thailand 7. Call Accounting Terminal (AT&T) 8. Clear-Air Turbulence

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

CAT3 CAT5 CATI CATLAS CATNIP CATS CATT CATV CAU CAUS CAV CAVE CB

CB Radio CBA CBAA CBAC CBC

CBCH CBCPS CBCPW CBDS CBEMA CBETS

Category 3 UTP Cable (copper cables) Category 5 UTP Cabling (copper cables) Computer-Aided Telephone Interviewing Centralized Automatic Trouble Locating and Analysis System Common Architecture for Next generation Internet Protocol Consortium for Audiographics Teleconferencing Standards 1. Controlled Avalanche Transit-time Triode (semiconductors) 2. China Academy of Telecommunications Technology 1. Community Antenna Television (broadcasting) 2. Community Access Television 3. Cable Television 1. Controlled Access Unit (LANs) 2. Connection Arrangement Unit (Northern Telecom) Conditional Access Uplink System (TV broadcasting) Constant Angular Velocity (hard disks) 1. Cave Automatic Virtual Environment 2. Cellular Authentication and Voice Encryption 1. Check Bits 2. Cell Broadcast (GSM) 3. Compensation Buffer 4. Citizens’ Band (radio service) Citizen’s Band Radio 1. Could Be Anything (fault type) 2. Community Broadcasters Association (U.S.A.) Community Broadcasters Association of Australia Context-Based Access Control 1. Canadian Broadcasting Corporation (company) 2. Cipher Block Chaining (data encryption) 3. Cell Broadcast Center (GSM) 4. China Broadcast Cybercast Cell Broadcast Channel (GSM) Conductor-Backed Co-Planar Stripline (microwave) Conductor-Backed Co-Planar Waveguide (microwave) 1. Connectionless Broadband Data Service (ATM) 2. Common Basic Data Set Computer and Business Equipment Manufacture Association Communications and Broadcasting Engineering Test Satellite

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CBF CBGA CBH CBI CBK CBL CBM CBMS CBO CBP CBQ CBR

CBS

CBSC CBT CBTA CBTR CBUD CBX CC

CCA CCAF CCB CCBM

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1. Computer-Based Fax 2. Community Broadcasters Foundation Ltd. (Australia) Ceramic Ball-Grid Array (microchips) Component Busy Hour Color Burst Inversion (TV broadcasting) Change Back 1. Computer-Based Learning (e-learning) 2. Communications By Line Commodore Business Machines Computer-Based Managing System (ICT) Continuous Bit Oriented Coded Block Patterns (TV broadcasting) Class-Based Queuing 1. Carrier and Bit Timing Recovery 2. Constant Bit Rate (ATM service) 3. Committed Bit Rate (ATM service) 4. Carson Bandwidth Rule 1. Certiﬁed Banyan Specialist (Banyan Systems) 2. Columbia Broadcasting System 3. Call Broadcast Services (GSM) 4. Constant Bit rate Service Canadian Broadcast Standards Council 1. Computer-Based Training (e-learning) 2. Core-Based Trees (IP multicast) 3. Cincinnati Bell Telephone company (U.S.A.) Canadian Business Telecommunication Alliance Carrier and Bit Timing Recovery “Call Before U Dig” (cabling) Computerized Branch Exchange (IBM) 1. Call Control (GSM) 2. Carbon Copy (fax and e-mail) 3. Courtesy Copy (e-mail) 4. Cross Connect 5. Country Code 6. Company Code 7. Constant Current 1. Carrier-Controlled Approach 2. Circuit Card Assembly Cluster Control Agent Function 1. Common Carrier Bureau (FCC) 2. Cluster Control Bus 3. Customer Care and Billing (GSM) Came Clear By Magic (repair technique)

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CCBS CCC

CCCH CCCP CCD CCDA CCDN CCDP CCE CCEB CCF CCFL CCG CCH CCI CCIA CCIE CCIR CCIRN CCIS CCITT

CCK CCL CCM

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Call Completion to Busy Subscriber 2. Customer Care and Billing System 1. Clear Channel Capability (data transmission) 2. Clear Coded Channel 3. Center for Corporate Communications 4. Call Control Character (telephony) 5. Command and Control Center 6. Customer Care Center (Inmarsat) 7. Credit Card Call 8. Communications Competition Coalition Common Control Channel (GSM) Committee on Computer-to-Computer Communications Protocol Charge-Coupled Device (semiconductors) Cisco Certiﬁed Design Associate (Cisco) Corporate Consolidated Data Network Cisco Certiﬁed Design Professional (Cisco) Call Carrying Equipment Combined Communications–Electronics Board 1. Cluster Control Function 2. Consumer Consultative Forum Cold-Cathode Fluorescent Lamp Control Clock Generator Connections per Circuit-Hour 1. Co-Channel Interference 2. Common Client Interface (Windows) Computer and Communications Industry Association Cisco Certiﬁed Internetwork Expert (Cisco) 1. Comite´ Consultatif des International Radiocommunications 2. Center for Communication Interface Research Coordinating Committee for International Research Networks 1. Common-Channel Interofﬁce Signaling 2. Control Command Information System 1. Comite´ Consultatif International Te´le´graphique et Te´le´phonique 2. Consultative Committee on International Telegraphy and Telephony (now ITU) Complementary Code Keying (modulation) 1. Conﬁguration Control Link 2. Carrier Common Line (charge) 1. Cross Connection Management 2. Counter-Counter Measure (electronics)

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Cc

C3CM CCMA CCMT CCNA CCNE CCNP CCNR ccNUMA CCP CCPCH CCPR CCR CCS

CCS7 CCSA CCSD CCSDS CCSL CCSN CCT

CCTA CCTV CCU CCV CCW

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Command, Control, and Communications Countermeasures Call Center Management Association (U.K.) Computer-Controlled Microwave Tuner (microwave) 1. Cisco Certiﬁed Network Associate (Cisco) 2. Customer’s Carrier Name Abbreviation Cisco-Certiﬁed Network Engineer (Cisco) Cisco-Certiﬁed Network Professional (Cisco) Call Completion on No Reply cache-coherent Non-Uniform Memory Access (computer) 1. Cluster Control Processor 2. Compression Control Protocol 3. Certiﬁcate of Computer Programming Common Control Physical Channel Co-Channel Power Ratio (microwave) 1. Carrier and Clock Recovery 2. Current Call Rate (ATM) 3. Customer Control Routing 1. Common Channel Signaling (ISDN) 2. Clear Conﬁrmation Signal (data communications) 3. Common Communication Support (protocol) 4. Centi Call Second Common Channel Signaling No. 7 1. Common Control Switching Arrangement (AT&T) 2. China Communication Standards Association Command Communications Service Designator Consultative Committee for Space Data Systems Compatible Current-Sinking Logic (digital electronics) Common Channel Signaling Network 1. Continuity Check Tone 2. Computer Compatible Tape 3. Consultative Committee of Telecommunications 4. Calling Card Table Central Computer and Telecommunications Agency Closed-Circuit Television (system) 1. Cluster Control Unit 2. Communication Control Unit (minicomputers) 3. Camera Control Unit Credit Card Validation 1. Cable Cutoff Wavelength (ﬁber optics) 2. counterclockwise

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

cd cd/m2 CD

CD-E CD-I CD-R CD-R/E CD-ROM CD-ROM/XA CD-RW CD-V CD-WO CDA CDAR CDAS CDB CDC

CDCA CDCS CDDI CDE CDEV CDF

CDFP CDFS CDG

1. change the current directory (MS DOS Command) 2. candela (unit of luminous intensity) candela per square meter 1. Compact Disk 2. Carrier Detect (modems) 3. Collision Detection 4. Campus Distributor (Campus backbone cable) 5. Count Down 6. Call Deﬁnition 7. Cell Delineation (ATM) Compact Disk Erasable Compact Disk Interactive Compact Disk Recordable Compact Disk Recordable and Erasable Compact Disk Read-Only Memory CD-ROM Extended Architecture Compact Disk Re-writable (computer) Compact Disk Video Compact Disk Write Once 1. Communications Decency Act 2. Call Duration Advice Customer Dialed Account Recording Commanding and Data Acquisition Station (remote sensing) 1. Clock Distribution Board 2. Code Data Byte (software downloading) 1. Control and Delay Channel 2. Customer Data Change 3. Chromatic Dispersion Coefﬁcient (ﬁber optics) 4. Connected Device Conﬁguration (J2ME) Continuous Dynamic Channel Allocation Continuous Dynamic Channel Selection Copper Distributed-Data Interface (cable) 1. Common Desktop Environment (UNIX) 2. Custom Design Engineering Control panel Device (Apple Macintosh) 1. Cutoff Decrease Factor (ATM) 2. Combined Distribution Frame 3. Cumulative Distribution Function 4. Channel Deﬁnition Format (Internet) Centrex Data Facility Pooling Compact Disk File System (CD-ROM drives) CDMA Development Group (U.S. standards organization)

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CDI

1. Clock Distribution Interface 2. Compact Disk Interactive CDL Coded Digital Locator CDLC Cellular Data Link Control (protocol) CDLRD Conﬁrming Design Layout Report Date CDM 1. Conditioned Diphase Modulation 2. China Digital Media (pay TV operator) 3. Code-Division Multiplexing CDMA Code-Division Multiple Access (cellular networks) CDMA 1X The ﬁrst generation of CDMA-2000 CDMA 1X EV DO The Evolved Data Only ﬁrst generation of CDMA-2000 (GSM) CDMA-2000 Code-Division Multiple Access 2000 (3rd Generation) CDMA2000 1x RTT Code-Division Multiple Access (CDMA) 1x (single-carrier) Radio Transmission Technology CDMA one The First commercial CDMA cellular system CDMP Cellular Digital Messaging Protocol CDN 1. Control Directory Number 2. Content Data Network 3. Content Delivery Network CDO Community Dial Ofﬁce (switching system) CDP 1. Cisco Discovery Protocol (Cisco) 2. Customized Dial Plan 3. Certiﬁcate of Data Processing CDPA Capture Division Packet Access (cellular networks) CDPD Cellular Digital Packet Data (cellular networks) CDPDF Cellular Digital Packet Data Forum CDPSK Coherent Differential PSK (modulation) .cdr Name extension for CorelDRAW format ﬁles (graphics) CDR 1. Call Data Record 2. Call Detail Record (cellular networks) 3. Call Drop Rate (GSM) 4. Critical Design Review 5. Clock/Data Recovery (LANs) 6. Complete Document Recognition CDRAM Cache Dynamic RAM (memory) CdS Cadmium Sulﬁde (semiconductors) CDS 1. Circuit Data Services 2. Chromatic Dispersion Slope (optical ﬁbers) CDSA Common Data Security Architecture CDSL Consumer DSL (access) CDT 1. Credit allocation (packet Switching) 2. Center for Democracy and Technology

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

CDTAC CDTV CDU CDV CDVCC CDVT CE C/E Buffer CeBIT CEBus CEC CECL CED CEDAR CEDT CEG CEI CEIR CEKS celliquette CELP cellphone CEM CEMA CEMF CEMH CEN CENELEC CEO

3. Control Data Terminal 4. Code Download Table (software downloading) Consumer/Disabilities Telecommunications Advisory Committee Comodore Dynamic Total Vision Central Display Unit 1. Call Delay Variation (ATM) 2. Compressed Digital Video 3. Compact Disk Video Coded Digital Veriﬁcation Color Code Cell Delay Variation Tolerance (ATM) 1. Connection Endpoint (ATM) 2. Circuit Emulation 3. Chip Enable (electronics) Compression and Expansion Buffer Centrum Buero Information Telekommunikation (Germany) Consumer Electronics Bus 1. Commission of the European Communities 2. China Electric Company 3. Canadian Electric Code Cascade Emitter-Coupled Logic (digital electronics) Capacitance Electric Disk Center of Excellence for Document Analysis and Recognition Called Equipment Identiﬁcation Tone Canterbury Electronics Group (New Zealand) 1. Connection Endpoint Identiﬁcation (ATM) 2. Comparable Efﬁcient Interface Central Equipment Identity Register Centrex Electronic Key Set Social etiquette for using cellphones Code Excited Linear Prediction (voice coding) cellular telephone Centro Esercizio de Manufenzione (Italy) Consumer Electronics Manufacturers Association (standards) Counter Electromotive Force Controlled Environment Man-Hole Comite´ European de Normalisation (Belgium standards) Comite´ European pour la Normalisation en Electrotechnique Chief Executive Ofﬁcer (of companies)

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CEOS CEOS-IDN CEP CEPS CEPT CER CERB CERDIP CERFnet CERMET CERN CERPACK CERT CES CESA CESID CEST CETIS CEU CEV CF

CFC CFA

CFAC CFAMN CFAR

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Committee On Earth Observation Satellite (remote sensing) CEOS International Directory Network (remote sensing) Circular Error Probability (transmission) Color Electronic Prepress System Conference of European Postal and Telecommunications Cell Error Ratio (ATM) Centralized Emergency Reporting Bureau (Canada) Ceramic Dual Inline Package (microchips) California Education and Research Federation Network Ceramic Metal (element) Centre European des Recherche Nucle´aire (Switzerland) Ceramic Package (microchips) Computer Emergency Response Team (organization) 1. Coast Earth Station (Inmarsat) 2. Circuit Emulation Switching (ATM) Cyberspace Electronic Security Act (U.S.A.) Caller Emergency Service ID Center for the Exploitation of Science and Technology Center for Educational Technology Interoperability Standards Commercial End User (DSL) Controlled Environmental Vault (room) 1. Call Forwarding (GSM) 2. Compact Flash (memory) 3. Center Frequency 4. Critical Frequency (propagation) Compact Flash Plus (memory) 1. Carrier Failure Alarm (transmission) 2. Commercial Frame Agreement (Inmarsat) 3. Carrier Facility Assignment 4. Connecting Facility Assignment 5. Connecting Facility Arrangement 6. Consumer Federation of America 7. Compact Flash Association 8. Cross-Field Ampliﬁer (microwave) Call Forward All Calls Call Forwarding Address Modiﬁed Notiﬁcation Constant False-Alarm Rate (radar)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

CFB CFC CFCA CFDA CFDAMA CFE CFF CFGDA CFM CFNRe CFNRy CFO CFP CFR CFRA CFS CFSK CFU CFV CFW CG CGA CGI CGI-bin CGISS .cgm CGM CGMP CGS unit CGSA CGW Ch

Call Forwarding on Mobile Subscriber Busy (GSM service) Current-to-Frequency Converter Communications Fraud Control Association (U.S.A.) Call Forward Don’t Answer Combined Free/Demand Assignment Multiple Access Contractor-Furnished Equipment 1. Coded File Format 2. Critical Fusion Frequency Call Forward Group Don’t Answer 1. Companded Frequency Modulation 2. Carrier Financial Management 3. Cubic Feet per Minute (PC fans) Call Forwarding on mobile subscriber Not Reachable (GSM) Call Forwarding on mobile subscriber No Reply (GSM service) Chief Financial Ofﬁcer Channel Frame Processor 1. Confirmation to Receive frame 2. Code of Federal Regulations Combined Fixed/Reservation Assignment Call Forwarding System Coherent FSK (modulation) Call Forwarding Unconditional (GSM supplementary service) Call For Votes (Usenet newsgroup) Call Forward Character Generator 1. Carrier Group Alarm 2. Color Graphics Adapter (320!200 pixel monitors) 1. Common Gateway Interface (Internet) 2. Computer Graphics Interface 3. Cell Global Identiﬁcation (GSM) Common Gateway Interface-binaries Commercial Government and Industrial Solutions Sector Name extension for Computer Graphics format ﬁles Computer Graphics Metaﬁle (format) Cisco Group Multicast Protocol Centimeter-Gram-Second unit (parameter) Cellular Geographic Service Area (cellular networks) Customer Gateway channel

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CHAP CHEST CHI CHINT CHKDSK CHRP CHS CHTML Ci CI

CIAC CIAJ CIAS CIB CIBER CIC

CICS CID

CIDB CIDCW CIDIN CIDR CiDSL CIE CIF

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Challenge-Handshake Authentication Protocol (security) Combined Higher Education Software Team (e-learning) Concentration Highway Interface (ISDN) Charge-Injected Transistor (semiconductors) Check Disk (DOS command) Common Hardware Reference Platform Cylinder-Head Sector (PC hard drive) Compact HTML (programming) Curie (unit of radioactivity) 1. Clear Indication 2. Cell Identity (GSM) 3. Congestion Indicator (ATM) 4. Certiﬁed Integrator 5. Customer Interface Computer Incident Advisory Capability Communications Industry Association of Japan Circuit Inventory and Analysis System Compliance & Information Bureau (FCC) Cellular Intercarrier Billing Exchange Roamer Record (GSM) 1. Customer Interface Conﬁguration 2. Carrier Identiﬁcation Code 3. Circuit Identiﬁcation Code (SS7) 4. Content Indicator Code 5. China Institute of Communications Customer Information Control System (IBM) 1. Customer Identity (British term) 2. Caller ID (telephony service) 3. Circuit Designator 4. Charge-Injection Device (semiconductors) 5. Consecutive Identical Digits Calling line Identiﬁcation Delivery Blocking (feature) CID on Call Waiting (telephony service) Common ICAO Data Interchange Network Classless Inter-Domain Routing (method) Consumer-installable DSL (access) 1. Commercial Internet Exchange 2. Computer-Integrated Engineering (ICT) 1. Cells In Frame (ATM) 2. Cells In Flight (ATM) 3. Common Intermediate Format (video compression) 4. Common Interchange Format

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

CIF-AD CIFAX CIFS CIGOS CIGRR CIID CIIG CIK CIM

CIO CIP

CIPA CIPHONY CIPS CIR

CIRA CIRF CIS CISA CISC CISCC Cisco CISE CISPR CIT

Cells In Frames-Attachment Device (ATM) Ciphered Facsimile Common Internet File System Canadian Interest Group on Open Systems Common Interest Group on Rating and Routing Card Issuer Identiﬁer Code Canadian ISDN Interest Group Cryptographic Ignition Key 1. Computer-Integrated Manufacturing (ICT) 2. Computer-Input Microﬁlm 3. Common Information Model (network management) 4. Customer Information Manager (MCI) 5. Corporate Information Management Chief Information Ofﬁcer (ICT) 1. Certiﬁed Internet Professional 2. Carrier Identiﬁcation Parameter (ATM) 3. Computer Interface Program 4. Channel Interface Processor (Cisco) Children’s Internet Protection Act Ciphered telephony Canadian Information Processing Society 1. Current Instruction Register (CPU) 2. Committed Information Rate (frame relay) 3. Committed Information Range (ATM) 4. Communications Industry Researchers (company) 5. Carrier to Interference Ratio 6. Computer Integrated Railroading (ICT) Canadian Internet Registration Authority Co-channel Interference Reduction Factor 1. Communications and Information Systems 2. Card Information Structure (memory card) China Information Service Association 1. Complex-Instruction-Set Computer (processor chips) 2. Customer Information Control System (software) Collocation Interconnection Service Cross Connection Computer Information Systems Company Computer and Information Science and Engineering (U.S.A.) Comite´ International Special des Perturbations Radioelectriques 1. Communications and Information Technology 2. Computer Integrated Telephone

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CITA CITC CITEL CITR CITRIS CITU CIV CIVDL CIX CJC CK CKL CKR CKSN CKT CL CLAMN CLAS CLASS CLC CLCC CLCI CLD CLDC CLDLS CLE CLEC CLEI CLEOS CLI CLIB CLID CLIP CLIR CLIS Clk CLLI

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Canadian Independent Telephone Association Communications and Information Technology Commission Comision Inter-Americana de Telecommunicaciones Canadian Institute for Telecommunications Research Center for Information Technology Research in the Interest of Society Central IT Unit (United Kingdom) Cell Inter-arrival Variation (ATM) Collaboration for Interactive Visual Distance Learning (e-learning) Commercial Internet Exchange Canadian Journal of Communication Ciphering Key Circuit Location Circuit Reference Ciphering Key Sequence Number (GSM) circuit Connectionless (mode) Called Line Address Modiﬁcation Notiﬁcation Centrex Line-Assignment Service Custom Local Area Signaling Services 1. Communications Line Controller 2. Carrier Liaison Committee Ceramic Leaded-Chip Carrier (electronics) Common Language Circuit Identiﬁcation Competitive Long-Distance (carrier) Connected Limited Device Conﬁguration ( J2ME) Connectionless Data Link Service 1. Common Logic Equipment 2. Customer Location Equipment Competitive Local Exchange Carrier Common Language Equipment Identiﬁer Conference of the Lasers and Electro-Optic Society 1. Caller Line Identiﬁcation (ISDN) 2. Command-Line Interface 3. Cumulative Leakage Index (FCC) C Language Interface Library (networking) Calling Line Identiﬁcation (GSM) Calling Line Identiﬁcation Presentation (GSM) Calling Line Identiﬁcation Restriction (GSM) Calling Line Identiﬁcation Signal (GSM) clock (pulse) Common Language Location Identiﬁer code (Telcordia)

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CLM CLNP CLNS CLP CLR CLS CLSI CLSP CLTP CLTS CLTU CLUT CLV cm cm3 CM

CMA CMAC CMC

CMCI CMD CMDR CMDS CMEA CMI Cmil

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Career Limiting Move Connectionless Network Protocol (OSI model) Connectionless-mode Network Service (OSI model) 1. Cell Loss Priority (ATM) 2. Certiﬁed Linux Professional 1. Cell Loss Ratio (ATM) 2. Connection Loudness Rating 3. Circuit Layout Record (type of service) 1. Connectionless Server 2. Control Line Setting 3. Clear the current Screen (MS DOS Command) Custom Large-Scale Integration (microchips) Competitive Local Service Provider Connectionless Transport Protocol (OSI model) Connectionless Transport Service Command Link Transmission Unit Color Look-Up Table Constant Linear Velocity (hard disks) centimeter cubic centimeter 1. Conﬁguration Management (wireless) 2. Connection Management (GSM) 3. Connection Matrix (MUX) 4. Computing Module 5. Cable Modem Communications Managers Association (standards organization) Control Mobile Attenuation Code 1. Common Messaging Calls 2. Comsat Mobile Communications 3. Computer-Mediated Communications (ICT) 4. Communications Management Conﬁguration 5. Customer Management Complex 6. Connection Management Controller (ATM) Cable Modem to CPE Interface Command (computer) Command Reject (computer) Centralized Message Distribution System Cellular Message Encryption Algorithm 1. Computer-Managed Instruction (e-learning) 2. Coded-Mark Inversion (data encoding) 3. Control Mode Idle Circular mil (measure of sectional area of a wire)

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CMIP CMIS CMISE CML CMOL CMOS CMOS RAM CMOS SOS CMOS SOS RAM CMOT CMP CMR CMRF CMRFI CMRR CMRS CMS

CMS-8800 CMS/MD CMT CMTRI CMTS CMW CMY CMYK

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Common Management Information Protocol (networking) Common Management Information Service (networking) Common Management Information Service Element (wireless) 1. Current-Mode Logic (digital electronics) 2. Customer Microcircuits Ltd (company) CMIP Over Logical link control Complementary Metal-Oxide Semiconductor (semiconductors) Random Access Memory using CMOS technology (memories) Silicon-On-Sapphire combined with CMOS technology A RAM memory using a combination of CMOS and Silicon-On-Sapphire technologies (memories) CMIP Over TCP/IP 1. Cluster Management Processor 2. Communications Management Processor 3. Chip-level Multiprocessing 1. Cellular Mobile Radio 2. Cell Misinsertion Rate (ATM) 3. Common-Mode Rejection (ampliﬁers) Combined Mode Resonator Filter Cable Modem to Radio Frequency Interface Common-Mode Rejection Ratio (ampliﬁers) Commercial Mobile Radio Service (cellular networks) 1. Cluster Management System 2. Content Management System 3. Changeable Message Sign 4. Call Management Services 5. Color Management System (monitors) Cellular Mobile telephone Service (North America) Cluster Management System Mediation Device Connectionless Mode Transmission Cable Modem Telco Return Interface (data over cable) 1. Cellular Mobile Telephone System 2. Cable Modem Termination System Compartmented Mode Workstation (networking) Cyan-Magneta-Yellow color model (computer imaging) Cyan-Magneta-Yellow-black color model (computer imaging)

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CN CNA CNAE CNAM CNC CND CNE CNEPA CNE CNES CNET CNF CNI CNIP CNIR CNIS CNIT CNM CNN CNO CNR CNRI CNS CNSA CNT CNTL CNX

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Complementary Network 2. Change Notice 3. Control Network (ATM) 1. Certiﬁed Novell Administrator (Novell NetWare) 2. Cooperative Network Architecture 3. Customer Name and Address bureau Customer Network Access Equipment Caller ID with Name 1. Central Node Controller 2. Computer Numerical Control (ICT) 3. Computerized Numerical Control 1. Calling Number Display 2. Calling Number Delivery Certiﬁed Novell Engineer (Novell NetWare) Certiﬁed Novell Engineer Professional Association (Novell, Inc.) Certiﬁed Novell Engineer (Novell NetWare) Centre National D’Etudes Spatiales (French Space Agency) Centre National d’Etudes de Te´le´communication (France) conference Certiﬁed Novell Instructor (Novell NetWare) Calling Number Identiﬁcation Presentation (wireless) Calling Number Identiﬁcation Registration (wireless) 1. Calling Number Identiﬁcation Service (wireless) 2. Channel Navigation Information Service Centro Nazionale Interuniversitario per Telecomunicazioni (Italy) 1. Customer Network Management (ATM) 2. Communications Network Management Cable News Network (TV broadcaster) Corporate Networking Ofﬁcer 1. Complex Node Representation (ATM) 2. Customer is Not Ready 3. Carrier-to-Noise power Ratio (transmission) Corporation for National Research Initiatives 1. Complementary Network Service 2. Communication Navigation Surveillance (aviation) China National Space Administration Coaxial Network Termination control Certiﬁed Network Expert

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CO CO-LAN COA COAI COAM COAT COB COB CoBAMs COBOL COBRA COBRAS COC COCOT COCUS COD CODAN CODAR CODASYL Codec CODLS CODS COE COER

COFA COFDM COFETEL COG COHO COLD CoLo COLP COLR COLT

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1. Connection Oriented 2. Central Ofﬁce (DSL) Central Ofﬁce Local Area Network Change Over Acknowledge (GSM message) Cellular Operations Association of India Customer Owned And Maintained telephone equipments Coherent Optical Adaptive Technique (ﬁber optics) Close Of Business Chip On Board Consortium of Brick And Mortars (e-commerce) Common Business-Oriented Language (programming) A wrong spelling of CORBA Cosmic Background Radiation Anisotropy Satellite Central Ofﬁce Connection Customer-Owned Coin-Operated Telephone Central Ofﬁce Code Utilization Survey 1. Connection-Oriented Data (ATM) 2. Catastrophic Optical Damage (ﬁber optics) Carrier-Operated Device Antinoise Correlation, Detection, And Ranging (submarine detection) Computer On Data Systems Languages (organization) Coder/decoder Connection-Oriented Data Link Service Connection-Oriented Data Service 1. Central Ofﬁce Equipment 2. Central Ofﬁce Engineer 1. Central Ofﬁce Equipment Report (of a telephone company) 2. Center for Organizational Excellence Research (New Zealand) Change Of Frame Alignment Coded Orthogonal FDM (transmission) Comision Federal de Telecomunicaciones (Mexico) Centralized Ordering Group Coherent Oscillator Computer Output to Laser Disk Co-Location (servers) Connected Line Identiﬁcation Presentation (GSM service) Connected Line Identiﬁcation Restriction (GSM service) Cellular On Light Truck

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

.com COM

COM port COM1 COM2 COM3 COMB Comdex COMINT COMJAM COMLOGNet comms COMP Compander COMPSURF CompTel CompTIA COMPUSEC COMS COMSAR Comsat COMSEC CON CONNEX CONF CONFIG CONP compander CoNS CONS CONTEL CONV COO

The MS DOS name extension for executable program ﬁles 1. serial communications port (computer) 2. Component Object Model (MS ActiveX platform) 3. Continuation Of Message (ATM) 4. Common Object Model (ICT) 5. Computer-Output Microﬁlm Communication port (computer) A communication port used for connecting a serial mouse A serial communication port used for connecting a modem A communication port used connecting other peripherals combiner Computer Dealers Exposition (trade show) Communications Intelligence Communications Jamming Combat Logistic Network (military) communications Compare ﬁles or set of ﬁles (MS DOS Command) Compressor-expander Comprehensive Surface Analysis (Novell program) Competitive Telecommunications Association (U.S.A.) Computing Technology Industry Association (U.S.A.) Computer Security 1. Circuit Order Management System 2. Consortium for Multipurpose Satellite (South Korea) Communications for Search And Rescue (IMO sub-committee) Communications Satellite Corporation (U.S. operator) Communications Security Circuit Order Number Connectivity Exchange configuration conﬁguration information (Novell NetWare utility) Connection-Oriented Network Protocol compressor and expander Consortium for School Networking Connection-Oriented Network Service (networking) Continental Telecom Inc. (company) converter Change Over Order (GSM message)

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Co-Pol COP COPOUS COPS COPT COPW COR CORBA CORE CoS COS COS/MOS COSC COSE COSETI COSINE CoSN COSName COSPAS

COT COTAR COTAT COTP COTS

COV COW

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Copolar (antennas) 1. Cable Organizer Panel 2. Certiﬁcate Of Proﬁciency (ship radio operator) Committee On Peaceful Use of Outer Space (United Nations) 1. Common Open Policy Service (IETF protocol) 2. Common Operations Software (Bell Labs) Coin-Operated Pay Telephone Customer Owned Premises Wire Circuit Order Record Common Object Request Broker Architecture Council Of Registrars Class of Service 1. Connection Oriented Service 2. Compatible for Open Systems 3. Corporation for Open Systems (organization) Complementary Symmetry Metal-oxide Semiconductor Customer Operations Support Center (Boeing) Common Open Software Environment (Unix) Columbus Optical SETI Cooperation for Open Systems Interconnection Networking in Europe Consortium for School Networking Class Of Service Name Cosmicheskaya Sistyema Poiska Avariynich Sudov (Russia) Space System for the Search of Vessels in Distress (Russia) 1. Central Ofﬁce Terminal/Termination 2. Customer Originated Trace (feature) 3. Customer Ofﬁce Terminal Correlated Orientation Tracking And Range (vehicle tracking) 1. Correlation Tracking And Triangulation (trajectories) 2. Committee On Transportation And Telecommunications Connection-Oriented Transaction Protocol 1. Connection-Oriented Transport Service 2. Commercial Off-The-Shelf (military) 3. Compact, Outdoor, Transportable, Single-site (Marconi) Control Over Voice (Mitel’s protocol) 1. Cell site On Wheels 2. Character-Oriented Windows

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CP

CP/M CPA

CPAF CPAS CPB CPC CPCI CPCN CPCS CPD CPDA CPDLC CPE CPFSK CPGA cpi CPI

CPL CPLD cpm

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Circular Polarization 2. Control Point (networking) 3. Connection Point 4. Change Proposal (Inmarsat) 5. Customer Premises 6. Carrier Pulse Control Program for Microcomputers 1. Co-Polarization Attenuation 2. Critical Path Analysis (ICT) 3. Close Point of Approach (shipboard radar) 4. Cost Per Action 5. Center for Policy Alternatives (Internet) 6. Computer Press Association 7. Chip Protection Act 8. Color Phase Alternation (television) Customer Premises Access Facility Cellular Priority Access Service 1. Corporation for Public Broadcasting 2. Central Processing Board 1. Customer Port Controller 2. Calling Party Control 3. Calling Party Connected Compact Protocol Control Information Certiﬁcate of Public Convenience and Necessity (FCC) Common Part Convergence Sublayer (ATM) Call Processing Data Compression Priority Demand Assignment Controller-Pilot Data-Link Control (aviation) 1. Customer Premises Equipment (networking) 2. Customer Provided Equipment (networking) Continuous Phase FSK (modulation) Ceramic Pin-Grid Array (microchips) characters per inch 1. Common Part Indicator (ATM) 2. Common Programming Interface (computer) 3. Common Physical Interface (ISDN) 4. Computer to PBX Interface 5. Cost Per Inquiry 1. Commercial Private Line 2. Call Processing Language (programming) 3. coupler Complex Programmable Logic Device (digital electronics) cycles per minute

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Cc

CPM

CPN CPNI CPODA CPP CPR cps CPS

CPSI CPSK CPSR CPSS CPT CPU CPU-bound CPUG CPW CQ CQFP CR

CR-LDP CRAFT CRAG

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1. Critical Path Method (project control) 2. Customer Premise Management 3. Cable Plant Management 4. Communications Processor Module 5. Continuous Phase Modulation 1. Calling Party Number 2. Customer Premises Network 3. Computer PBX Network Customer Proprietary Network Information Compression Priority Demand Assignment (protocol) 1. Calling Party Pays (telephone call charge) 2. Cable Patch Panel (DEC) Continuing Property Record (Telcordia Technologies) 1. characters per second (data transfer) 2. cycles per second 1. Cellular Priority Service 2. Call Progress Signal 3. Cassette Preparation System (TV broadcasting) 4. Co-Planar Stripline 5. Cisco Powered Networks Customer Premises Satellite Interface Coherent PSK (modulation) Computer Professionals for Social Responsibility Control Packet Switching System 1. Call Progress Tone 2. “Carriage Paid To” (network language) Central Processing Unit (computer) Computation-bound Call Pickup Group Co-Planar Waveguide (microwave) General call to all stations (Morse code transmissions) Ceramic Quad Flat Pack (microchips) 1. “Carriage Return” (control character of printers) 2. Call Reference 3. Call Register (telephone switch) 4. Call Request 5. Channel Reliability 6. Connection Request 7. Contrast Ratio (screens) 8. Customer Record Constraint-based Routed-Label Distribution Protocol (MPLS) Cooperative Research Action For Technology Cellular Radio Advisory Group

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

CRATT CRB CRC CRCS CRD CREAM CREDFACS CREG CREN CRF CRIS CRISP CRITO CRITCOM CRM CRMAP CRO CROM CRP CRS CRST CRT CRTC CRTSSDA CRV Cryosar CS

Cryptographic Radio Teletype equipment Community Radio Broadcasters 1. Cyclic Redundancy Check (data error detection) 2. Communications Research Center (Canada) 3. Communications Regulation Commission (Bulgaria) Continuous Rigid Cable Support 1. Cluster Reconciliation Descriptor 2. Contention Resolution Device Cosmic Radiation Effects and Activation Monitors (microwave) Conduit, Risers, Equipment space, Ducts, and Facilities Concentrated Range Extension with Gain Corporation for Research and Educational Networking (ICT) 1. Connection-Related Function (ATM) 2. Cell Relay Function (ATM) Customer Record Information System CAP Real-time ITIP-Based Scheduling Proﬁle Center for Research on Information Technology and Organizations (U.S.A.) Critical Itelligence Communications 1. Call Record Management 2. Customer Relationship Management (ICT) 3. Cell Rate Margin (ATM) Cyclic Reservation Multiple Access Protocol 1. Complete with Related Order 2. Cathode-Ray Oscilloscope (test instrument) Control and Read-Only Memory 1. Capacity Reserve Pool 2. Cabling Reference Panel 3. Command Repeat 1. Coast Radio Station 2. Cell Relay Service (ATM) Cheyenne River Sioux Tribe (telephone authority) Cathode-Ray Tube (displays) Canadian Radio Television and Telecommunications Commission Cascaded Reactively Terminated Single-Stage Distributed Ampliﬁer Call Reference Value (number) Cryogenic Switching by Avalanche and Recombination 1. Cluster Startup 2. Cell Selection

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Cc

CS-ACELP CS-CDPD CSA

CSAR CSB CSBT CSC

CSCD CSD CSDC CSCF CSDN CSE CSEL CSF CSFI CSI

CSIRO

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3. Chip Select (electronics) 4. Control Strobe (logic signal) 5. Convergence Sublayer (B-ISDN and ATM) 6. Communication Satellite (broadcasting) 7. Capability Sets (INs) 8. Coding Scheme Conjugate Structure-Algebraic Code Excited Linear Prediction Circuit-Switched Cellular Digital Packet Data 1. Call-path Services Architecture (IBM) 2. Canadian Standards Association (Canada) 3. Canadian Space Agency (Canada) 4. Comprehensive System Accounting 5. Carrier Serving Area (DSL) Combat Search And Rescue (Motorola) Cable Services Bureau (FCC) Chinese users association for Satellite communications, Broadcasting and Television 1. Common Signaling Channel 2. Cospas-Sarsat Council 3. Circuit Switching Center 4. Customer Service Center (MCI) 5. Customer Service Coordinator 6. Customer Service Consultant 7. Customer Support Center Circuit-Switched Cellular Data 1. Cluster Speciﬁc Descriptor 2. Cellular Security Device 3. Circuit-Switched Data Circuit-Switched Digital Capability (AT&T) Call Session Control Function Circuit-Switched Data Network 1. Communications Security Establishment (Canada) 2. CAMEL Service Environment (GSM) Cable Select (computer) 1. Clique Storing Facility 2. Cell Site Function Communication Subsystem For Interconnection (IBM) 1. Called Subscriber Identiﬁcation 2. Cellular Specialties Inc. (company) 3. Computo Service Inc. (company) 4. Computer Security Institute Commonwealth Scientiﬁc and Industrial Research Organization

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

CSID CRIS CSC CSL CSLIP CSM

CSMA CSMA-CA CSMA-CD CSMDR CSMI CSN CSNet CSO CSOC CSP

CSPDN CSPF CSPP CSQP CSR

CSS

Calling Station ID Customer Records Information System Customer Service Center 1. Communications Services Limited 2. Current-Sinking Logic (digital electronics) 3. Current-Sourcing Logic (digital electronics) Compressed Serial Link Internet Protocol 1. Communication Systems Management 2. Communications Security Material 3. Cell-Site Modem 4. Clock Supply Module 5. Combined Symbol Matching Carrier-Sense Multiple Access Carrier-Sense Multiple Access with Collision Avoidance Carrier-Sense Multiple Access with Collision Detection Centralized Station Message Detail Reporting Call Screening, Monitoring and Intercept Circuit-Switched Network Computer and Science Network (U.S.A.) 1. Central Services Organization 2. Computing Services Ofﬁce (Internet directory) 3. Composite Second Order Convolutional Self-Orthogonal Code (error correction) 1. Certiﬁed Service Provider 2. Competitive Service Provider 3. Commerce Service Provider 4. Content Service Provider 5. Communications Service Provider 6. Chip-Scale Package Circuit-Switched Public Data Network Constrained Shortest Path First (routing protocol) Computer Systems Policy Project Customer/Supplier Quality Process 1. Cell Switch Router (ATM) 2. Customer Service Record 3. Customer Service Representative 4. Customer Station Rearrangement 1. Cascading Style Sheets (Web design) 2. Cellular Subscriber Station 3. Coordinator, Surface Search 4. Customer Support System (GSM) 5. Content Scrambling System (broadcasting) 6. Customer Service Segment

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Cc

CST CSTA CSTP CSU

CSUA CSV CT

CT Scan CT0 CT1 CT2 CT2-CAI CT3IP CTA CTAS CTB CTC CTCA CTCSS CTD

CTE CTERM CTFM CTFT

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1. Computer-Supported Telephony (Siemens) 2. Compatible Sideband Transmission Computer-Supported Telephony Application Customer Speciﬁc Term Plan 1. Channel Service Unit (networking) 2. Channel Sharing Unit 3. Customer Service Unit 4. Circuit Switching Unit Canadian Satellite Users Association 1. Circuit-Switched Voice (call for voice) 2. Comma Separated Value format (data storage) 1. Conformance Test 2. Cordless Telephone 3. Computer Telephony 4. Computed Tomography (medicine) 5. Call Transfer 6. Center Tap (circuit diagrams) Computer Tomographic Scanning (medicine) Zero Generation Cordless Telephony Cordless Telephone Generation 1 Cordless Telephone Generation 2 CT2 Common Air Interface Channelized T3 Interface Processor 1. Cordless Terminal Adapter (DECT) 2. Competitive Telecommunications Association (Canada) Carrier Test Access Switch Composite Triple Beat Counter/Timer Circuit Canadian Telecommunications Consultants Association Continuous Tone Controlled Squelch System (cellular networks) 1. Call Transfer Delay (ATM) 2. Clock Time Deference 3. Current Transfer Device 4. Continuity Tone Detector 1. Circuit Terminating Equipment 2. Channel Translating Equipment 3. Coefﬁcient of Thermal Expansion (microwave) Communications Terminal (protocol) Continuous-Transmission Frequency-Modulation Color Thin-Film Transistor (semiconductors)

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CTI

CTIA CTIP CTL CTM CTN CTO CTOS CTP CTR Ctrl CTS

CTSS CTT CTTC CTTE CTTU CTU CTX CTY cu CU

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Computer Telephony Integration (ICT) 2. Computers in Testing Initiative (ICT) 3. Critical Technologies Institute 4. Call Technologies, Inc. (company) 1. Cellular Telecommunications Industry Association (U.S.A.) 2. CT Innovation Alliance Computer Telephony Interface Products 1. Complex Text Layout 2. Complementary-Transistor Logic (digital electronics) 1. Cordless Terminal Mobility (DECT) 2. Circuit Transfer Mode 3. Conformal Transformation Method 1. Corporate Telecommunication Network 2. Consumers’ Telecommunication Network 3. Call Tracking Number 1. Commonwealth Telecommunications Organization (U.K.) 2. Chief Technology Ofﬁcer (ICT) Convergent Technology Operating System 1. Connection Terminating Point 2. Cordless Telephony Proﬁle (Bluetooth) Common Technical Regulations of Europe (ETSI) Control key (keyboard) 1. Clear-To-Send (RS 232 signal) 2. Communication Transport System 3. Conformance Testing Service 4. Carpal Tunnel Syndrome of wrist and hand (keyboard) Compatible Time-Sharing System Central Trafﬁc Terminal Coax To The Curb Common TDM Terminating Equipment Centralized Trunk Test Unit 1. Central Terminal Unit 2. Command & Telemetry Unit 1. Clear-To-Transmit (RS 232 signal) 2. centrex Console Teletype cubic (SI Units) 1. Carrier Unit 2. Channel Unit 3. Crosstalk Unit

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Cc

CUA CUD CUG CUI CUJT CUL CUSEEME CV

CVBS CVC CVD CVDL CVF CVP CVPO CVR CVS CVSD CW

CVT CWA CWC CWDM CWIS CWML CWS CWSA CWVA CX

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75

Common User Access (computer) could (Morse code transmissions) Closed-User Group (GSM supplementary service) Character User Interface (computer) Complementary Uni-Junction Transistor (semiconductors) See You Later (Morse code transmissions) “See You, See Me” (Internet videoconferencing system) 1. Code Violation (data encoding) 2. Checksum Value 3. Computer Vision 4. Continuous Vulcanization (cables) 5. Constant Voltage Composite Video Blanking and Synchronization (TV signals) Computer Virus Catalog Chemical Vapor Deposition process (semiconductors) Continuously Variable Delay Line Compressed Volume File (Microsoft) 1. Cooperative Voice Processing (British) 2. Certiﬁed Vertical Partner Chemical Vapor Pulse Oxidation process (ﬁber optics) Crystal Video Receiver Computer Vision Syndrome Continuously Variable Slope Delta (modulation) 1. Continuous Wave 2. Carrier Wave 3. Composite Wave 4. clockwise 5. Call Waiting Supplementary Service (GSM) Constant Voltage Transformer Communications Workers of America Cable & Wireless Communications (broadcasting) 1. Coarse Wavelength-Division Multiplexing (ﬁber optics) 2. Circular Waveguide Dual Mode (microwave) Campus-Wide Information System (universities) Compact Wireless Markup Language (programming) Communications Wiring System Constant Width Slot Antenna (microwave) Cable & Wireless Virtual Academy Change Context (networking)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

CXR CXML cybernaut CYTA CZCS

carrier Commerce XML (programming language) cybernetics astronaut Cyprus Telecommunication Authority (GSM operator) Constant Zone Color Scanner (remote sensing)

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D

Dd d D D-AMPS D-Bit D-Channel D-CLEC D-FET D-LINK D-VHS D/A D/C D/I D/L D/S D2-MAC D4 DA

1. Symbol for preﬁx deci-, denoting one-tenth or 10K1 2. Symbol for distance 1. Symbol for electrostatic ﬂux density 2. Symbol for Drain (FETs) 3. Symbol for Directivity (antennas) Digital AMPS Delivery conﬁrmation Bit (X.25) Data Channel (ISDN) Digital Competitive Local Exchange Carrier Depletion-mode FET (semiconductors) Diagonal Link (SS7) Digital version of VHS recording or playback Digital-to-Analog (electronics) Down Converter (satcom) Drop and Insert Down Link (satcom) Digital-to-Synchro (electronics) Multiplexed Analog Component type D2 (TV format) Digital 4th Generation Channel Bank (transmission) 1. Demand-Assigned (access) 2. Doesn’t Answer (phone) 77

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

DA/TDMA DAA DAB DAC DACC DACCS DACD DACS DAF DAG DAI DAL DAM DAMA DAMPS DAN DAND DAO DAP

DAQ DAR DARPA DARPANet DARS

3. Distribution Area (DSL) 4. Directory Assistance 5. Destination Address (LANs) 6. Differential Attenuation (Apple Macintosh) 7. Desk Accessory (software) 8. Discontinued Availability (circuit) Demand-Assigned mode TDMA (access) Data Access Arrangement 1. Digital Audio Broadcasting (satcom) 2. Dynamically Allocatable Bandwidth 3. Data Acquisition Board 1. Digital-to-Analog Converter (electronics) 2. Dual Attachment Concentrator 1. Digital Access Cross-Connect 2. Directory Assistance Call Completion Digital Access Cross-Connect System (Intelsat) Digital Automatic Call Distributor Digital Access and Cross-connect System (DSL) 1. Destination Address Field 2. Data Administration Forum 3. Decrement All Frame (Motorola) Distress Alert Generator Digital Audio Interface Dedicated Access Line DECT Authentication Module Demand-Assignment Multiple-Access Digital Advanced Mobile Phone Service DECT Access Node Despun Active Nutation Damper (Intelsat) Disk At Once (data storage) 1. Directory Access Protocol (network management) 2. Data Access Protocol (DECNet) 3. Data Access Point (MCI) 4. Data Acquisition Processor 5. Dedicated Array Processor (microchips) 6. Demand-Assigned Processor 1. Delivered Audio Quality 2. Data Acquisition 1. Digital Audio Radio 2. Dynamically Adaptive Routing Defense Advanced Research Project Agency Defense ARPANet Digital Audio Radio System (broadcast operator)

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Dd

DAS DASCPC DASD DASS DASS2 .dat DAT Data CLEC DATE DATTS DATU DAU DAV DAVIC DAVID DAWS dB dB/K dBa dBA dBa(FIA) dBa(HAI) dBa0 dBc dBd .dbf dBf dBHz dBi dBic dBk dBm DBM dBm0 dBm0p

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1. Dial Access Switching (Cisco) 2. Data Acquisition System 3. Dual Attachment Station Demand Assignment SCPC (access) Direct-Access Storage Device (semiconductors) 1. Demand Assignment Signaling & Switching unit 2. Digital Access Signaling System 3. Direct-Access Secondary Storage Digital Access Signaling System No. 2 Name extension for data ﬁles (computer) 1. Digital Audio Tape 2. Dynamic Address Translation Data Competitive Local Exchange Carrier Duly Authorized Telecommunications Entity (Intelsat) Data Acquisition Telecommand and Tracking Station (Intelsat) Direct-Access Test Unit Dumb Ass User 1. Distributed Authoring and Versioning 2. Data Available (logic signal) 3. Digital Audio-Visual Digital Audio-Visual Council (Italy) Digital Audio/Video Interactive Decoder (ITU) Digital Advanced Wireless Service Decibel (one-tenth of a Bel) Decibels relative to reciprocal temperature (in Kelvin) Decibels adjusted Decibel Audio (sound level) dBa measured with FIA-line weighting (ﬁber optics) dBa measured with HAI-receiver weighting (ﬁber optics) dBa measured at zero transmission level point Decibels relative to unmodulated carrier power level Decibels relative to a Dipole antenna gain Name extension for database files (computer) Decibels above one femtowatt Decibels relative to one Hertz Decibels relative to an isotropic antenna gain Decibels relative to an isotropically radiated carrier Decibels relative to one kilowatt Decibels relative to one milliwatt (0 dBmZ1 milliwatt) Double-Balanced Mixer (microwave) Decibels relative to one milliwatt at a point of zero dBm0 measured with psophometric weighting

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

dBmc dBmc0 dBm(f1Kf2) dBmp dBmV dBnW dB0 dBp dBpsoph dBpW dBq dBr dBrn dBrnC dBrnC0 dBuV dBuW dBV dBW dBx DB

DBA DBC DBD DBF DBFN DBit DBMS DBP DBPSK DBR

dBm measured with C-message weighting dBmc measured at 0 Transmission Level Point Flat noise power in dBm Decibels relative to one milliwatt using psophometric weighting Decibels relative to one millivolt across a speciﬁc impedance Decibels relative to one nanowatt (0 dBnWZ1 nW) Decibels relative to 0TLP Decibels relative to one picowatt Noise power in dBm measured with psophometric weighting Decibels referred to one picowatt (0 dBpWZ1 pW) Decibels relative to digital speech codec Quality Decibels referred to a given reference Decibels relative to reference noise level Decibels relative to reference noise using C-message weighting Decibels relative to reference noise using a type C-messaging channel adjusted for equivalence to a 0 dBm equivalent point Decibels relative to one microVolt Decibels relative to one microWatt (mW) Decibels relative to one Volt Decibels relative to one Watt Decibels above the reference coupling 1. Data Burst 2. Dummy Burst (GSM) 3. database 4. Data Bus 1. Dynamic Bandwidth Allocation (protocol feature) 2. Direct Broadcast Address 3. Database Administrator (ICT) Dense Binary Code 1. Database Driver 2. Digital Bearing Discriminator Digital Beam Forming (microwave) Digital Beam Forming Network Delivery conﬁrmation Bit (X.25) Database Management Systems (ICT) Deutsche Bundespost (German Communications) Differential Binary PSK (modulation) Deterministic Bit Rate

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Dd

DBS DBT DBTVS DBU DC DC/AC DC/DC DCA

DCAS DCASP DCC

DCCH DCD

DCDI DCE DCF DCFL DCG DCH DCI

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81

1. Direct Broadcast by Satellite (TV service) 2. Digital Broadcast Satellite 1. Deutsche Bundespost Telecom (Germany) 2. Defect-Based Testing Direct Broadcast Television Satellite Dial Backup 1. Direct Current (power) 2. Disconnect Conform 3. Disconnect (live internet chat) Direct Current to Alternating Current (power) Direct_Current-to-Direct_Current converter (electronics) 1. Document Content Architecture (IBM) 2. Dynamic Channel Allocation (DECT) 3. Defense Communication Agency (U.S.A.) 4. Directory Client Agent 5. Download Conﬁguration Area (software downloading) Direct Carrier Administration System Digitally Controlled Analog Signal Processing 1. Data Communications Channel (MUX) 2. Data Country Code (ATM) 3. Digital Compact Cassette 4. Digital Cross-Connect (MUX) 5. Digital Color Code 6. Digital Command Center 7. Digital Communications Center 8. Digital Communications Conference Dedicated Control Channel (GSM) 1. Data-Carrier-Detect (RS 232 signal) 2. Dynamically Conﬁgurable Device 3. Duty Cycle Distortion 4. Document Content Description Directional Correlation Deinterlacing 1. Data Circuit-Terminating Equipment (networking) 2. Data Communications Equipment (networking) 3. Distributed Computing Environment (service) Dispersion Compensating Fiber Direct-Coupled FET Logic (digital electronics) Dispersion Compensation Grating (optical signals) 1. D-Channel Handler 2. Dedicated Channel 1. Digital Control Interface 2. Data Communications Company of Iran 3. Display Control Interface

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82

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

DCLEC DCM

DCME DCMI DCMS DCN DCNR DCOF DCOM DCP DCPR DCPSK DCR DCS

DCS-1800 DCT DCTE DCTI DCTL DCTN DCTU DCU DCV DCWV DCXO DD DDA

A CLEC specialized in delivering only DSL services 1. Digital Circuit Multiplication 2. Decoder and Control Module 3. Dispersion Compensation Module 4. Dynamically Controllable Magnetic Digital Circuit Multiplication Equipment Dublin Core Metadata Initiative Digital Circuit Multiplication System 1. Data Communication Network 2. Disconnect frame Digital Content Network Receiver Doubly Cladded Optical Fiber Distributed Component Object Model (ICT) 1. Digital Communications Protocol 2. Device Control Protocol 3. Data Collection Platform (remote sensing) Detailed Continuing Property Records Differentially Coherent PSK (modulation) 1. Direct-Conversion Receiver 2. Down-Converting Receiver 1. Digital Cellular System (GSM) 2. Digital Communication System 3. Digital Cross-connect System (MUX) 4. Digital Clock Source 5. Digital Coded Squelch 6. Data Collection System (remote sensing) 7. Defense Communication System 8. Distributed Communications System Digital Cellular System at 1800 MHz (GSM-1800) 1. Digital Carrier Termination 2. Discrete Cosine Transform (mathematics) Data Circuit-Terminating Equipment Desktop Computer Telephony Integration Direct-Coupled Transistor Logic (digital electronics) Defense Commercial Telecommunications Network Digital Carrier Trunk Unit Distribution Control Unit Digital Compressed Video DC Working Voltage (electronics) Digitally-Compensated Crystal Oscillator 1. Dotted Decimal notation 2. Double Density (ﬂoppy diskette) 1. Domain Deﬁned Attribute (X.400) 2. Digital Differential Analyzer

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Dd

DDB DDBMS DDC DDCMP DDCP DDCPSK DDE DDEML DDF DDI DDJ DDL DDM DDN DDN-NIC DDNS DDoS DDP DDR DDR-SDRAM DDS

DDSD DDT De-emph DE DEB

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1. Digital Data Bank 2. Device Dependent Bitmap Distributed Database Management System 1. Direct Department Calling (service) 2. Direct Digital Control (computer) 3. Display Data Channel (VESA standard) Digital Data Communication Message Protocol Direct Digital Color Proof (test sheet) Double Differential Coherent PSK (modulation) Dynamic Data Exchange (Windows feature) Dynamic Data Exchange Management Library Digital Distribution Frame 1. Direct Digital Interface 2. Direct Dialing Inward Data Dependent Jitter Data Deﬁnition/Description Language (programming) Distributed Data Management architecture (networking) 1. Defense Data Network (U.S.A.) 2. Digital Data Network Defense Data Network–Network Information Center Dynamic Domain Naming System (Internet) Distributed Denial-of-Service 1. Datagram Delivery Protocol 2. Distributed Data Processing 3. Data Distribution Plan (IMO) 1. Disengagement Denial Ratio 2. Double Data Rate (memory) Double Data Rate Synchronous Dynamic RAM (memory) 1. Digital Data Service (DSL) 2. Digital Data Storage (standard) 3. Dataphone Digital Service (AT&T) 4. Distributed Data System 5. Direct Digital Synchronous (interface) 6. Direct Digital Synthesizer 7. Direct Dialing Service Delay Dial Start Dial (protocol) Digital Dirty Trick (security feature) De-emphasis (frequency modulation) 1. Discard Eligibility bit (frame relay) 2. Designated Entity 3. Differentially Encoded Differentially Encoded Baseband

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

DEBS DEC DECA DECNet DECPSK DECT DEF Deg DEK DEL DELNI DELTIC DEM DEMKO demo DEMOD Demod/Remod DEMPR DEMS DEMUX DEMUXing DEN DENet DEP DEPS DEPSK dequeue DES DESC DET Detem DEU DF

Dynamic Electronic Bias System 1. Digital Equipment Corporation 2. decoder Digital Electronics Control Assembly Digital Equipment Corporation’s proprietary Network architecture Differentially Enhanced Coherent PSK (modulation) 1. Digital Enhanced Cordless Telecommunications (ETSI) 2. Digital European Cordless Telecommunications Design Exchange Format degree Data Encryption Key 1. Delete a ﬁle (MS DOS Command) 2. Delete key (PC keyboard) 1. Digital Ethernet Local Network Interconnect 2. DEC Local Network Interface Delay-Line-Time-Compression 1. demodulator 2. Digital Elevation Model (remote sensing) Denmark Elektriske Materie Kontrol demonstration part (software package) demodulator Demodulation and Remodulation DEC Multiport Repeater Digital Electronic Management System demultiplexer demultiplexing Directory Enabled Networking (network management) Danish Ethernet Network Degraded Error Performance Departmental Entry Processing System Differential Encoded PSK (modulation) double-ended queue 1. Data Encryption Standard (IBM algorithm) 2. Destination End Station (ATM) 3. Double-Ended Synchronization (networking) Defense Electronic Supply Center detector Optical detector/emitter combiner (transducer) Data Encryption Unit 1. Direction Finder (equipment) 2. Distribution Frame 3. Distress Frequency

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Dd

DFA DFB DFC DFD DFE DFES DFG DFI DFM DFS DFSK DFT DG DGIS DGNSS DGPS DGPT DGT DHACP DHBT DHCP DHN DHSD DHTML DI DIA DIA/DCA diac DIAG DIALAN

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85

Doped Fiber Ampliﬁer (ﬁber-optic) Distributed Feedback (laser) Data Flow Control 1. Data Flow Diagram (ICT) 2. Digital Frequency Discriminator Decision Feedback Equalizer (adaptive ﬁlter) Department For Education and Skills (U.K. Government) Diode Function Generator Digital Facility Interface 1. Digital Frequency Modulation 2. Design For Manufacturability 3. Dispersive Fade Margin 1. Dynamic Frequency Selection 2. Distributed File System (Windows 2000 feature) Double FSK (modulation) 1. Direct Facility Termination 2. Discrete Fourier Transform (algorithm) 3. Design For Test Director General Direct Graphics Interface Speciﬁcation (computer) Differential Global Navigation Satellite Systems Differential GPS Department of General Posts and Telecommunications, Vietnam 1. Direcsio´n Ge´ne´rale des Te´le´communicaciones (France) Dynamic Host Automatic Conﬁguration Protocol Double-Heterojunction Bipolar Transistor Dynamic Host Conﬁguration Protocol (TCP/IP) Digital Home Network Duplex High-Speed Data Dynamic HTML (programming) 1. Dedicated Integrator 2. Dielectric Isolation Document Interchange Architecture (data transmission) DIA Document Content Architecture diode AC (semiconductor switch) diagnostic port DMS Integrated Access Local Area Network (Northern Telecom)

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86

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

DIB

DiBEG DIC DICODE-NRZ DID DIEL DIF DIFAR DIFCOD DIFDECOD DiffServ DiffZL digicash DigiTAG DII DIL DILL DIM DIMM DIMS DIN DINA

DIOCES diode DIP DIPS dir DIS

1. Dual Independent Bus (Intel’s Pentium II processor) 2. Directory Information Base (X.500) 3. Device Independent Bitmap (ﬁle format) Digital Broadcasting Expert’s Group Dubai Internet City Di-Code-Non-Return to Zero level (data encoding) 1. Destination ID 2. Direct Inward Dialing (phone line) 3. Detailed Interface Dossier Advisory committee on telecommunications for Disabled and Elderly people Data Interchange Format (computer) Directional Finding And Ranging (submarine warfare) Differential Coder Differential Decoder Differentiated Services (QoS) Differential Ziv–Lempel (data encoding) digital cash Digital Television Action Group (broadcasting) Defense Information Infrastructure 1. Direct In-Line (ofﬁce trunk) 2. Dual In-Line (microchips) Another form of saying “DLL” 1. Digital Interface Module 2. Document Image Management Dual In-line Memory Module (Macintosh PCs) Document Image Management System Deutsches Institute fu¨r Normung (German Standards) 1. Distributed Intelligent Network Architecture 2. Dynamic Intelligent Network Architecture 3. Direct Noise Ampliﬁcation (jammer) 4. Danish Informatics Network in the Agricultural Science Distributed Interoperable and Operable Computing Environments and Systems A two-electrode electron tube or semiconductor 1. Dual Inline Package (microchips) 2. Document Image Processing 3. Dedicated Inside Plant (local exchanges) Digital Image Processing System directory (MS DOS Command) Draft International Standard (ISO)

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Dd

DISA Disc DISH DISKCOPY DISN DISNet DISOSS DIT DITS DIU DIW DIX DL

DLC

DLCI DLE DLEC .dll DLL

DLM DLP DLPBC DLPI DLR

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1. Direct Inward System Access (PBX feature) 2. Defense Information System Agency disconnect Data Interchange for Shipping Copy from one ﬂoppy Disk to another (MS DOS Command) Defense Information Systems Network Defense Integrated Secure Network Distributed Ofﬁce Support System (IBM) Directory Information Tree (X.500) Digital Information Transfer System 1. Digital Interface Unit 2. Digital Indoor Unit (VSAT terminals) D type Inside Wire Digital/Intel/Xerox 1. Distance Learning (ICT) 2. Data Link 3. Digital Library 4. Dead Load 1. Digital Loop Carrier (transmission equipment) 2. Direct Line Console 3. Dynamic Load Control 4. Data Link Control (protocol) 5. Data Link Connection (frame relay) 6. Dead-Link Check 7. Dual Layer Capacitor (electronics) 1. Data Link Connection Identiﬁer (frame relay) 2. Digital Loop Carrier Interface Data Link Escape (character control code) Data Link Exchange Carrier Name extension for Dynamic-Link Library ﬁles (computer) 1. Down Line Load 2. Dynamic-Link Library (Windows feature) 3. Data Link Layer driver 4. Digital Leased Lines Double-Level Metal (microchips) Digital Light Processing Dual Loop Port Bypass Circuitry Data Link Provider Interface (ATM) 1. Destination Local Reference (GSM) 2. Design Layout Report 3. Deutches Zentrum fu¨r Luft-und Raumfahrt (Germany)

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DLS DLSE DLSw DLSW DLT DLTU DLVA DM

DMA

DMB DMBU DMC DMCA DMD DME DMF DMG DMH DMI DMI-BOS DML DMM DMO

1. Data Link Switching (IBM) 2. Distance Learning Section (e-learning) 3. Digital Loudspeaker Dial Line Service Evaluation Data Link Switching (standard) Data Link Switching Workgroup 1. Digital Linear Tape 2. Design Life Time (satellite) Data Link Trunk Unit (AT&T) Detector Log Video Ampliﬁer 1. Delta Modulation 2. Digital Modulation 3. Delay Modulation 4. Differential Modulation 5. Detection Module 6. Disconnect Mode (X.25) 7. Distress Message 1. Direct Memory Access (computer) 2. Deferred Maintenance Alarm 3. Differential Mode Attenuation (AC power system) 4. Document Management Alliance 5. DECT Multimedia Access Proﬁle 1. Digital Multipoint Bridge 2. Digital Multimedia Broadcasting Dial Modem Backup Unit 1. Dual voice grade Modem Card 2. Discrete Memory Channel Digital Millennium Copyright Act 1. Differential Mode Delay (ﬁber-optic) 2. Digital Micromirror Device (display) 1. Distributed Management Environment 2. Distance Measuring Equipment Data Management Facility Distress Message Generator (IMO) Data Message Handler (cellular networks) 1. Desktop Management Interface (networking) 2. Digital Multiplexed Interface (AT&T) Digital Multiplexed Interface-Bit-Oriented Signaling 1. Data Manipulation Language (programming) 2. Declarative Markup Language (programming) 3. Development Markup Language (programming) Digital Multimeter (test equipment) 1. Digital Modiﬁcation Order 2. Data Mode Operation

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Dd

DMOS DMPDU DMR DMS

DMSP DMSU DMT DMTF DMUX DMW DMX DMZ DN DNA

DNAL DNAR DNC

DNCF DND DNI DNIC DNID DNIS DNL DNP DNPA DNPIC DNPS DNR

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3. Direct Mode Operation (cellular networks) Double-diffused MOS (semiconductors) Derived MAC PDU (service) 1. Digital Microwave Radio 2. Dual-Mode Resonator (microwave) 1. Digital Multiplex System 2. Digital Multiplexed Switch (Northern Telecom) 3. Digital Media Solutions 4. Document Management System (ICT) Defense Meteorological Satellite Program Digital Main Switching Unit 1. Discrete Multitone (modulation) 2. Digital Multiplexed Trunk Desktop Management Task Force (ICT) demultiplexer Digital Microwave Digital Music Express Demilitarized Zone (networks) 1. Directory Number (ISDN telephone) 2. Digital Network 1. Digital Network Architecture 2. Distributed Network Administration 3. DEC Network Architecture 4. Dynamic Node Access Dedicated Network Access Line Directory Number Analysis Reporting 1. Distributed Networking Computing 2. Dynamic Network Controller 3. Direct Numerical Control 4. Distributed Network Computing Directory Number Call Forwarding Do Not Disturb (PBX) Digital Non-Interpolation Data Network Identiﬁcation Code (X.121) Data Network Identiﬁcation code (Inmarsat) Dialed Number Identiﬁcation Service Dynamic Non-Linearity (microwave) Dial-up Networking Proﬁle (Bluetooth) Data Numbering Plan Area (X.25) Directory Number Primary InterLATA Carrier Divisional Network Product Support 1. Dynamic Network Reconﬁguration (IBM) 2. Dynamic Noise Reduction (satcom)

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DNS DNSIX DNSSE DNTX DOA DoB .doc DoC DOC DocObject DoCoMo DOCSIS DoD DoD-STD DOD DoDD DoDI DoDISS DOE DOM DOMSAT DOP Doran DoS DOS DOSA DOT memory DOV DOVAP DP

DPA

3. Dialed Number Recorder 1. Domain Naming System (Internet) 2. Domain Name Service (Internet) 3. Distributed Network Service Defense Network Security Information Exchange Domain Name System Security Extensions Do Not Transmit (Morse code) Dead On Arrival (of an equipment) Denial of Business Name extension for Word Processor document ﬁles (computer) Department of Communications (Canadian Government) Dynamic Overload Control (switch) Document Object Do Communications over the Mobile Network (operators) Data-Over-Cable Service Interface Speciﬁcations Department of Defense (U.S. army) Department of Defense Standard (U.S.A.) 1. Direct Outward Dialing (PBX feature) 2. Depth Of Discharge Department of Defense Directive (U.S.A.) Department of Defense Instructions (U.S.A.) DoD Index of Speciﬁcations and Standards (U.S.A.) Direct Order Entry domestic Domestic Satellite communication system Dedicated Outside Plant (local exchanges) Doppler ranging system Denial-of-Service (network attack) Disk Operating System (computer) Distributed Open Signaling Architecture (IP telephony) Domain-Tip memory Data Over Voice Doppler Velocity And Position system 1. Data Port 2. Data Parity 3. Data Processing 4. Deﬂate Protocol 5. Dial Pulse 6. Distribution Partner (Inmarsat) 1. Demand Protocol Architecture 2. Digital Port Adapter (Northern Telecom)

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Dd

DPBC DPBX DPC DPCCH DPCH DPCM DPCS DPDCH DPDT DPE DPFC DPHEMT dpi DPI

DPLB DPLL DPLX DPM DPMA DPMI DPMS DPNSS DPO DPP

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3. Digital Performance Archive 4. Dearborn Protocol Adapter (PC board) 5. Differential Power Analysis 6. Document Printing Application Double-Pole Back Connected Digital Private Branch Exchange 1. Destination Point Code (routing) 2. Data Processing Center (remote sensing) 3. Digital Port Cluster Dedicated Physical Control Channel Dedicated Physical Channel Differential PCM (modulation) Digital Personal Communications Services Dedicated Physical Data Channel Double-Pole Double-Throw (switches) Distributed Processing Environment Double-Pole Front Connected Double-heterojunction Pseudomorphic High-Electron Mobility Transistor dots per inch (scanners) 1. Dedicated Pair-In (telephone wire pair) 2. Direct Pickup Interference 3. Dots Per Inch (image resolution) 4. Data Processing Company of Iran Digital Private Line Billing Digital Phase-Locked Loop 1. Duplex 2. Duplexer 1. Digital Panel Meter (test equipment) 2. Digital Phase Modulation 3. Dual-Precedence Message 1. Data Processing Management Association 2. Dynamic Power Management Architecture (ICT) DOS Protected Mode Interface 1. Digital Performance Monitoring System 2. Display Power Manager Signaling (VESA standard) Digital Private Network Signaling System 1. Dedicated Pair Out (telephone wire pair) 2. Direct Public Offering 3. Digital Pulse Origination 1. Distributed Processing Peripherals 2. Distributed Programming Platform 3. Distributed Pipe Protocol 4. Digitally Programmable Potentiometer

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

DPPB DPRAM DPRS DPS DPSK DPST DPT DPU DPX DQDB DQPSK DQTV DR DRA DRAM DRAW DRB DRC DRCS DRDRAM DRDW DRFM DRiP DRM DRO DRP DRRS DRS

5. Direct Print Protocol 6. Demand Priority Protocol Digital Primary Patch Bay (ﬁber optics) Dual Port RAM (memory) Domestic Public Radio Service 1. Differential Phase Shift 2. Digital Passage Service 3. Digital Protection Switch Differential PSK (modulation) Double-Pole Single-Throw (switches) Digital Pulse Termination 1. Digital Processing Unit 2. Dynamic Path Update (IBM) 3. Director of Public Utilities Data Path loop Extension Distributed Queue Dual Bus (architecture) Differential Quadrature PSK (modulation) Distribution Quality Television 1. Dual Rate 2. Design Review 3. Digital Radio Direct Radiating Array (antennas) Dynamic RAM (memory) Direct Read After Write (optical disks) Digital Radio Broadcasting Design Rule Checking Digital Radio Concentrator System Direct Rambus Dynamic RAM (memory) Direct Read During Write (optical disks) Digital Radio Frequency Memory Duplicate Ring Protocol (Cisco) Digital Rights Management 1. Dielectric Resonator Oscillator (microwave) 2. Dielectric Resonator Oscillator (electronics) 1. Digital Receiver Processor (Inmarsat) 2. Distribution and Replication Protocol Digital Radio Relay System 1. Data Relay Satellite 2. Digital Reference Signal 3. Digital Radio System 4. Digital Reconﬁguration Service 5. Direct Receiving Station (satcom) 6. Disengagement Request Signal

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Dd

DRT DRTL DRTS DRTT DRU .drv .drw DRX DS

DS-0 DS-1 DS-2 DS-3 DS-4 DS-5 DS-CDMA DSA

DSAP DSAT DSB DSB-EC DSB-RC DSB-SC DSB-TC DSC

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DS3 Redundancy and Termination Dial Repeating Tie Line Data Relay and Test Satellite Dial Repeating Tie Trunk 1. DACS Remote Unit 2. Digital Remote Unit (NEC) Name extension for driver ﬁles (computer) Name extension for Micrografx DRAW format ﬁles (graphics) Discontinuous Reception (GSM mobile station) 1. Dispersion Shifted (optical ﬁber) 2. Downstream 3. Digital Service 4. Digital Signal 5. Data Strobe (logic signal) Digital Signal Level 0 Digital Signal Level 1 (synonym for T1) Digital Signal Level 2 (synonym for T4) Digital Signal Level 3 (synonym for T3) Digital Signal Level 4 (synonym for T4) Digital Signal Level 5 (synonym for T54) Direct Sequence CDMA (access) 1. DAMA Signaling Analyzer 2. Distributed System Architecture (networking) 3. Data Service Adapter 4. Directory Service Agent (software) 5. Direct Selling Association 6. Digital Signature Algorithm 7. Dial Service Assistance Destination Service Access Point 1. Digital Supervisory Audio Tones 2. Digital Satellite Television (broadcasting) 1. Double-Sideband (modulation) 2. Digital Sound Broadcasting Double-Sideband Emitted Carrier (modulation) Double-Sideband Reduced Carrier (modulation) Double-Sideband Suppressed Carrier (modulation) Double-Sideband Transmitted Carrier (modulation) 1. Data Satellite Channel 2. Differential Scanning Calorimetry 3. Digital Service Channel 4. Digital Selective Calling (shipping) 5. Digital Subscriber Controller 6. Digital Still Camera

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DSCP DSCS DSDC DSE

DSF DSH DSI DSL DSLAM DSM

DSMCC DSN

DSNG DSO DSOM DSP DSR

7. Digital-to-Synchro Converter 8. Distributed Statistical Computing 9. descrambler Differential Service Code Point Defense Satellite Communication System Direct Service Dialing Capability 1. Distributed Single-Layer Embedded (test method) 2. Distributed Systems Engineering 3. Data Switching Exchange 4. Data Switching Equipment 5. Deep Sky Exploration society 6. Digital Subtitle Encoder 7. Dynamic System Estimation Library Dispersion Shifted Fiber Double Super Heterodyne 1. Digital Speech Interpolation (voice compression) 2. Digital Switching Information 3. Detailed Spectrum Investigation 1. Digital Subscriber Line (access) 2. Digital Subscriber Loop (AT&T) 3. Design System Language (programming) DSL Access Multiplexer (network device) 1. Delta–Sigma Modulation 2. Direct Sequence Modulation 3. Direct-Spread Modulation 4. Design Structure Matrix 5. Digital Switching Matrix 6. Dependency Structure Matrix Digital Storage Media Command and Control (protocol) 1. Distributed Systems Network 2. Defense Switch Network 3. Double Shelf Network 4. Deep Space Network Digital Satellite News Gathering 1. Digital Storage Oscilloscope 2. Digital Sampling Oscilloscope Distributed System Object Model (IBM) 1. Digital Signal Processor (chip) 2. Display Systems Protocol 3. Domain-Speciﬁc Part (ATM) 1. Data-Set-Ready (RS 232 signal) 2. Data Sampling Rate 3. Data Signaling Rate

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Dd

DSRC DSRI DSRR DSS

DSS1 DSS2 DSSCS DSSLL DSSS DSSSL DST DSTB DSTE DSTN DSTO DSTP DSTR DSU DSUB DSVD DSX DT DTAB DTAD DTAN DTAP DTC DTCM

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4. Digital Satellite Radio (broadcasting) 5. Disengagement Success Ratio (ﬁber optics) Dedicated Short-Range Communications Destination Station Routing Indicator Digital Short-Range Radio 1. Digital Switched Service 2. Digital Signature Standard 3. Digital Signaling System 4. Digital Satellite System (STB hardware) 5. Direct Station Selector (PBX hardware) 6. Direct Satellite System 7. Decision Support System (set of programs) Digital Subscriber Signaling System 1 Digital Subscriber Signaling System 2 Defense Special Service Communications System Differentiated Services over Speciﬁc Link Layer Direct Sequence Spread Spectrum (transmission) Document Style Semantics and Speciﬁcation Language (ISO) 1. Direct Sounding Transmission 2. Dispersion Supported Transmission Digital Set-Top-Box 1. Digital Subscriber Terminating Equipment 2. Data Subscriber Terminating Equipment Double-layer Super-Twisted Nematic (display) Defense Science and Technology Organization (Australia) Double-Shielded Twisted Pair distribution Data Service Unit (networking) Data Service (SCPC) Sub-band Signaling Channel Digital Simultaneous Voice and Data (modems) Digital Signal Cross-Connect system 1. Deutsche Telekom 2. Direct Termination Demountable Tape-Automated Bonding (IC) Digital Telephone Answering Device Despun Torque Actuated Nutation (Intelsat) Direct Transfer Application Part (GSM) 1. Digital Trunk Controller 2. Digital Transmit Command 3. Digital Trafﬁc Channel (cellular networks) Differential Trellis Coded Modulation

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

DTCP DTD DTE DTF

Dual Tape-Carrier Package (microchips) Document Type Deﬁnition (XML) Data Terminal Equipment (networking) 1. Dynamic Tracking Filter 2. Distance-To-Fault (microwave) Direct To Home (broadcasting) Digital Trunk Interface 1. Diode–Transistor Logic (digital electronics) 2. Designated Transit List (ATM) 3. Dial Tone Line 4. Distance Teaching and Learning (e-learning) DTL input to TTL output and vice versa (digital electronics) Digital Trunk and Line Unit 1. Dynamic synchronous Transfer Mode 2. Digital Terrain Model (remote sensing) Dual-Tone Multifrequency (telephone sets) Digital Trunk Manual (telephony) Exchange 1. Data Transfer Network 2. Data Transmission Network 1. Dial Tone Ofﬁce 2. Digital Test Oscilloscope 3. Digitally Tuned Oscillator 4. Direct Termination Overﬂow 1. Desktop Publishing (ICT) 2. Distributed Transaction Processing (computer networks) 1. Data-Terminal-Ready (RS 232 signal) 2. Data Transfer Rate 3. Discrete Tone Relation 1. Digital Trunked Radio System 2. Digital Tape Recording System 3. Digital Telemetry Recording System 4. Data Transfer Request Signal 1. Digital Termination System (microwave) 2. Digital Television Standard 3. Digital Theater System (home audio systems) 4. Distributed Time Service 5. Decoding Time Stamp Digital Television Station Project, Inc. 1. Dial Tone Speed Recording 2. Digital Tape System Recording 3. Digital Temporary Storage Recording 1. Digital Trunk Testing

DTH DTI DTL

DTL/TTL DTLU DTM DTMF DTMX DTN DTO

DTP DTR DTRS

DTS

DTSP DTSR DTT

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Dd

DTTB DTTL DTU DTV DTVC DTVE DTX DU DUA DUAL DUART DUE DUN DUP DUT DUV DV DVB DVB-C DVB-H DVB-IRD DVB-RCS DVB-S DVB-SI DVB-T DVBG DVC DVCD DVD DVD-E DVD-R DVD-RAM DVD-ROM DVD-R/W

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2. Digital Tape Transfer 3. Digital Tie Trunk 4. Digital Telecommunication Trunk 5. Digital Terrestrial Television (broadcasting) Digital Terrestrial Television Broadcasting Data Transition Tracking Loop 1. Digital Test Unit 2. Digital Trunk Unit 3. Digital Transmission Unit Digital Television (broadcasting) Digital Television by Cable Digital Transversal Equalizer Discontinuous Transmission (cellular networks) 1. Data Unit 2. Dispersion-Unshifted (optical ﬁber) Directory User Agent (software) Distributed Update Algorithm Dual Universal Asynchronous Receiver–Transmitter Dumb User Error Dial-Up Networking (PC communications) Data User Part (SS7) Device Under Test (equipment) Data Under Voice (AT&T) Digital Video Digital Video Broadcasting (organization) DVB Cable transmission standard DVB-Handheld DVB Integrated Receiver Decoder DVB-Return Channel by Satellite system DVB Satellite transmission standard DVB Service Information DVB Terrestrial (standard) Digital Video Broadcasting Group 1. Digital Video Compression 2. Digital Video Cassette Double Video Compact Disk 1. Digital Video Disk (ICT) 2. Digital Versatile Disk (ICT) Digital Video Disk-Erasable Digital Video Disk-Recordable Digital Video Disk-Random Access Memory (rewritable) Digital Video Disk-Read Only Memory Digital Video Disk Re-Writable

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DVD2 DVI DVM DVMRP DVOM DVP DVR DVRN DVS DVSI DVST DVTS DWA DWC DWDM DWG DWI DWMT DWS DWT DX DXB DXC DXer .dxf DXF DXI DXing dyn

Digital Video Disk 2nd Generation 1. Digital Video Interface (standard) 2. Digital Video Interactive 1. Digital Voltmeter (test equipment) 2. Data and Voice Multiplexer 3. Data and Voice Multiplexing Distance Vector Multicast Routing Protocol (IETF) Digital Volt–Ohm-Milliammeter (electronics) Digital Video Processor Digital Video Recorder Dense Virtual Routed Network Digital Video Service Digital Voice Systems, Inc. (company) Direct View Storage Tube Desktop Videoconferencing Telecommunications System Data Warehousing Alliance (Microsoft) Digital Wireless Communications Dense Wavelength-Division Multiplexing (ﬁber optics) Digital Working Group Data Warehousing Institute Discrete Wavelet Multitone Dialable Wideband Service Discrete Wavelet Transform (mathematics) 1. Data Exchange 2. Direct Current Signaling 3. duplex Drawing Interchange Binary (ﬁle extension) Digital Cross-Connect (MUX) A long-Distance listener of short wave radio stations (Ham Radio) Name extension for AutoCAD 2-D format ﬁles (graphics) Drawing interchange Format (CAD ﬁles) Data Exchange Interface The hobby of receiving and listening to a long Distant short wave radio station (Ham Radio) dyne (unit of force)

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E

Ee e

e-bomb e-book e-business e-cash e-check e-commerce e-credit e-Fax e-form e-government e-law e-learning e-mail e-money e-rate e-signature e-text e-stamp e-zine

1. Symbol for basic unit of electron charge 2. Symbol for instantaneous value of an alternating voltage 3. Symbol for electronic version e-mail bomb electronic book electronic business electronic cash (e-commerce) electronic check (e-commerce) electronic commerce electronic credit electronic Facsimile electronic form electronic government electronic law electronic learning (e-learning) electronic mail electronic money electronic rate electronic (digital) signature electronic text electronic stamp electronic Magazine 99

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

E E band E Channel E Link E Port E&I E&M E-1 E-2 E-3 E-BCCH E-Carrier E-FET E-IDE E-LMI E-Nose E-O E-OTD E-TDMA E-time E/A E/S E2PROM EA

EAA EAC EACA EACEM EADAS EADP EAE EAEO

1. Symbol for Emitter (transistor circuit diagrams) 2. Symbol for Electric ﬁeld strength (antennas) 3. Symbol for preﬁx exa-, denoting 1018 or 260 Optical Frequency band ranging from 1360 to 1460 nm Echo Channel Extended Link Expansion Port Engineering and Installation “Ear and Mouth” (signaling) The European equivalent of American T-1 transmission line operating at 2.048 Mbps The European equivalent of American T-2 transmission line operating at 8.448 Mbps The European equivalent of American T-3 transmission line operating at 34.368 Mbps Extended-Broadcast Control Channel European Carrier (ITU-T) Enhancement-mode FET (semiconductors) Enhanced IDE (interface) Enhanced Local Management Interface (frame relay) Electronic Nose Electrical-Optical Enhanced Observed Time Difference Extended TDMA (access) Execution time Events and Alarms subsystem (Intelsat) Earth Station (satcom) Electronically Erasable Programmable ROM (memory) 1. Extended Addressing (frame relay) 2. Equal Access 3. Early Assignment 4. Effective Availability Electronic Afzar Azma Company (Iran) 1. European Astronaut Center 2. Engineering Assistance Contract (Intelsat) European Association of Communications Agencies European Association of Consumer Electronics Manufacturers Engineering and Administrative Data Acquisition System European Association of Directory and database Publishers Extended Arithmetic Element End Access End Ofﬁce

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Ee

EAFC EAGE EAGLE EAI EAN EANTC EAP EAR EARC EARN EAROM EARP EARSeL EAS

EASI EAX EB Eb/No EBA EBAM EBCDIC EBD EBDI EBE EBGA EBHC EBICON EBIOS EBITDA

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Enhanced Automatic Frequency Control (electronics) Electrical Aerospace Ground Equipment (Intelsat) Extended Area GPS Location Enhancement 1. External Alarm Indicator 2. Enterprise Application Integration European Article Numbering (bar coding) European Advanced Networking Test Center (Germany) Extensible Authentication Protocol (OSI model) Echo Attenuation Ratio (transmission) Extraordinary Administrative Radio Conference European Academic and Research Network Electrically Alterable ROM (memory) Ethernet Address Resolution Protocol European Association of Remote Sensing Laboratories 1. Emergency Alert System (cable TV broadcast) 2. Events and Alarms System (Intelsat) 3. Extended Area Service (network feature) 4. Electronic Acquisition System 5. Electronic Articles Surveillance 6. Engineering and Applied Sciences 7. Enterprise Application Server 8. European Astronomical Society ETSI ATM Services Interoperability Electronic Automatic Exchange 1. Expansion Buffer 2. Errored Block 3. Exa-Byte, which is 260 or 1024 times petabytes Energy per bit-to-Noise power spectral density (ratio) 1. European Broadcasting Area 2. Eventual Byzantine Agreement Electron-Beam-Accessed Memory Extended Binary-Coded Decimal Interchange Code (computer) Effective Bill Date Electronic Business Data Interchange Embedded Base Equipment (Bell) Enhanced Ball-Grid Array (microchips) Equated Busy Hour Call (Intelsat) Electron Bombardment Induced Conductivity Enhanced BIOS (computer) Earnings Before Interest, Taxes, Depreciation and Amortization

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

EBL EBO EBONE EBPP EBR EBS EBSD EBU EBX EC

ECA ECAC ECB ECC

ECC RAM ECCA ECCKT ECCM ECCO ECDIS ECF ECG

1. Electronic Bearing Line (navigation) 2. Electron Beam Lithography (semiconductors) Embedded Base Organization (Bell) European network backbone (service) Electronic Bill Presentation and Payment Electronic Beam Recorder 1. Emergency Broadcast System (cable TV) 2. Electron-Bombarded Semiconductor (device) Electron Back-Scatter Diffraction (microwave) European Broadcasting Union Electronic Branch Exchange 1. Exchange Carrier 2. Electronic Carrier 3. Energy Communications (PBX feature) 4. Electro-optic Coefﬁcient (ﬁber optics) 5. Element Controller 6. Equipment Clock 7. End Chain 8. Echo Canceller Exchange Carrier Association European Civil Aviation Conference 1. Error Correction Bit 2. Enhanced Cellular Base Station 1. Error Checking and Correction code 2. Embedded Control Channel (MUX) 3. Electronic Common Control 4. Electronic Commerce Canada Inc. 5. Electronically Controlled Coupling 6. Emergency Communications Center 7. Exchange Carrier Code (Telcordia Technologies) 8. Elliptic Curve Cryptography (wireless) 9. Egypt Cyber Center Error Correcting Code RAM (memory) European Cable Communications Association (Belgium) Exchange Company Circuit 1. Electronic Counter-Countermeasure (interference) 2. Electromagnetic Counter-Countermeasure (interference) Equatorial Constellation Communications Organization Electronic Chart Display Information System Embedded Code Formatting Electrocardiogram (medicine)

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Ee

ECGA ECH ECHO ECI ECIS ECITC ECL ECM

ECMA ECMEA ECMP ECMR ECMS ECN ECO ECOC ECOMEG ECP

ECPA ECPE ECS ECSA ECSD ECSSB

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Enhanced Color Graphics Adapter (640!400 pixel monitors) 1. Enhanced Call Handling 2. Echo-Cancelled Hybrid (DSL) European Commission Host Organization 1. End Chain Indicator 2. External Call Interface 1. European Committee for Interoperable Systems 2. European Computer Industry research Center 3. European Conference on Information Systems European Committee for Information Technology and Certiﬁcation Emitter-Coupled Logic (digital electronics) 1. Echo Canceller Module 2. Error Correction Mode (G3 fax machine) 3. Electronic Countermeasures (radar) 4. Electromagnetic Countermeasures (interference) 5. Entitlement Control Message (broadcasting) European Computer Manufacturers Association (Switzerland) Enhanced Cellular Messaging Encryption Algorithm Equal Cost Multiple Routing (trafﬁc) Equal Cost Multipath Routing Egyptian Company for Mobile Services (operator) 1. Electronic Communications Network 2. Emergency Call Network 3. Explicit Congestion Notiﬁcation (IP standard) Electron-Coupled Oscillator (electronics) European Conference on Optical Communication E-Commerce Experts Group 1. Enhanced Call Processing (voice mail) 2. Extended Capabilities Port (computer) 3. Encryption Control Protocol 4. Electronic Commerce Platform 5. Executive Cellular Processor Electronic Communications Privacy Act Embedded Customer-Premises Equipment (telephone company) 1. European Communication Satellite 2. Electronic Commerce Service 3. Electronic Chart System (navigation) Exchange Carriers Standards Association Enhanced Circuit-Switched Data Exalted Carrier SSB (modulation)

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104

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

ECT ECTA ECTEL ECTF ECTRA ECTUA ED ED RAM EDA EDAC EDACS EDAM EDC EDCH EDD EDDA EDF EDFA EDGAR EDGE EDH EDI EDIA EDIDAG EDIF EDIFACT EDIMAR EDIS EDIU EDL EDLIN

1. Enterprise Caching Technology 2. Explicit Call Transfer European Competitive Telecommunications Association European Telecommunications and Professional Electronics Industry 1. Enterprise Computer Telephony Forum (U.S.A.) 2. European Community Telework Forum European Committee for Telecommunications Regulatory Affairs European Council of Telecommunications Users Association 1. Electronic Directory 2. Ending Delimiter (LANs) Enhanced Dynamic RAM (memory) 1. Electronic Design Automation (ICT) 2. Electronic Directory Assistance 3. Erbium-Doped Ampliﬁer (ﬁber optics) Error Detection and Correction (transmission) Enhanced Digital Access Communications System Enhanced Digital Announcement Machine 1. Error Detection and Correction 2. Error Detection Code (transmission) Enhanced D-Channel Handler Enhanced Disk Drive European Digital Dealers Association Erbium-Doped Fiber Erbium-Doped Fiber Ampliﬁer (ﬁber optics) Electronic Data Gathering Archiving and Retrieval Enhanced Data-Rates for GSM Evolution Electronic Document Handling Electronic Data Interchange (ICT) Electronic Data Interchange Association Electronic Data Interchange of Dangerous Goods information Electronic Data Interchange Format (ICT) EDI for Administration, Commerce And Transport (ICT) Electronic Data Interchange of Maritime documents (ICT) Emergency Digital Information System/Service Expansion Digital Interface Unit Environment Data Link Editor of Lines (outdated MS-DOD text editor)

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Ee

EDM EDMS EDO EDO DRAM EDO RAM EDP EDPS EDRS EDS EDSAC EDSL EDSS1 EDTR EDTV EDVAC EE EEC EEG EEHLLAPI EEHO EEI EEL EEMA EEMS EEP EEPG EEPROM EER EES EESN EESS

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1. Electronic Document Management 2. Electronic Discharge Machining Engineering Document Management System (ICT) 1. Extended Data Output (memory) 2. Enhanced Data Output (memory) 3. Equipment Design Objectives Extended Data Output DRAM (memory) Extended Data Output RAM (memory) 1. Electronic Data Processing (computer) 2. Exchange Delivery Point Electronic Data Processing System European Data Relay Satellite Extended Data Service Electronic Delay Storage Automatic Computer Extended DSL (access) European Digital Signaling System No. 1 Effective Data Transfer Rate (transmission) 1. Enhanced-Deﬁnition Television (broadcasting) 2. Extended-Deﬁnition Television (broadcasting) Electronic Discrete Variable Automatic Computer End-to-End signaling 1. Error Checked and Corrected 2. Electromagnetic Emission Control Electroencephalogram (medical equipment) Entry Emulator High-Level Language Applications Programming Interface Either End Hop Off 1. External Environment Interface 2. Edison Electric Institute Enhanced Extended Link European Electronic Messaging Association Enhanced Expanded Memory Speciﬁcation (memories) 1. Electroencephalophone 2. Electromagnetic Emission Policy Enhanced Electronic Program Guide Electronically Erasable Programmable ROM (memory) Effective Earth Radius 1. Earth Exploration Satellite 2. Escrow Encryption Standard (U.S. Department of Justice) Expanded Electronic Serial Number Earth Exploration Satellite Service (ITU)

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EESSI EETDN EF EF&I EFCI EFD EFF EFI&T EFIS EFL EFMA EFOC EFR EFS EFT EFTA EFTPOS EFTS EG EGA EGC EGI EGM EGNOS EGP EGPRS EGSM EGW EHF EHR EHT EHTPS EHV EHz

Comprehensive Glossary of Telecom Abbreviations and Acronyms

European Electronic Signature Standardization Initiative (ICT) End-to-End Transit Delay Negotiation Entrance Facility Engineer, Furnish, and Install (purchase method) Explicit Forward Congestion Indicator (ATM) Event Forwarding Discriminator (wireless) Electronic Frontier Foundation (standards organization) Engineer, Furnish, Install, and Test Electronic Flight Information System 1. Emitter-Follower Logic (digital electronics) 2. Equivalent Focal Length Ethernet in the First Mile Alliance European Fiber Optics and Communications (conference) Enhanced Full Rate (codec) 1. Error Free Seconds 2. Enhanced Full-rate Service 3. Electronic Filing System (Intelsat) Electronic Funds Transfer (ICT) European Free Trade Association (Geneva) Electronic Funds Transfer at Point Of Sale (ICT) Electronic Funds Transfer System European Graphics Association Enhanced Graphics Adapter (640!350 pixel monitors) 1. Enhanced Group Calling (Inmarsat) 2. Equal Gain Combiner Embedded Global Positioning Satellite Inertial Navigation System Extraordinary General Meeting (Intelsat) European Geostationary Navigation Overlay Service (satellite) Exterior Gateway Protocol (routing) Enhanced General Packet Radio Service Extended (frequency range) GSM Edge Gateway 1. Extremely High Frequency (30–300 GHz range) 2. Error Hold File Enhanced Half-Rate codec Extremely High Tension Extremely High-Tension Power Supply Extra-High Voltage (power) Exa-Hertz (1018 Hz)

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Ee

EI EIA EIAJ EICS EICTA EID EIDE EIDQ EIF EIG EIGRP EIIA EIM EIMF EIN EIP EIPA EIR EIRENE EIRP EIS EISA EIT EITA EIU EIUF EJTAG EKE EKMS EKTS EL ELAN ELE ELEC

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107

Error Interval Electronic Industries Alliance (standards organization) Electronic Industries Association of Japan Emergency Integrated Communication System European Information and Consumer Electronics Technology Industry Association Equipment Identiﬁer (mobile radio) Enhanced Integrated Drive Electronics (interface) European International Directory Enquiries Electronic Industries Foundation Electronic Information Group Enhanced Interior Gateway Routing Protocol (Cisco) Embedded Industrial Internet Appliance 1. Ethernet Inverse Mapper 2. Emirates Internet & Multimedia (U.A.E.) European Interactive Media Federation European Information Network Early Implementers Program (Novell, Inc.) 1. Electronic Information and Communication for Pedagogical Academies (Austria) 2. European Information Provider Association 1. Excess Information Rate (frame relay) 2. Equipment Identity Register (GSM) European Integrated Railway Radio Enhanced Network Effective Isotropically Radiated Power (microwave) 1. Executive Information System (ICT) 2. Expanded Interconnection Service 3. Epidemic Intelligence Service Extended Industry-Standard Architecture (PC bus) Event Information Table (broadcasting) European Information Technology Association (U.K.) Ethernet Interface Unit European ISDN Users’ Forum Enhanced JTAG 1. Encrypted Key Exchange (protocol) 2. Electronic Key Exchange Electronic Key Management System Electronic Key Telephone Service (ISDN) 1. elevation 2. Electro Luminescent Emulated LAN (ATM) Extremely Low-frequency Emission (monitors) Enterprise Local Exchange Carrier

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E

108

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

ELED ELF ELFEXT ELG ELINT ELIU ELOT ELS NetWare ELSEC ELSR ELSSE ELSU ELT EM

EMA EMACS EMAG Email EMBARC EMC EMCON EMD EME

EMEA .emf EMF

EMG EMI EML

Edge-emitting Light-Emitting Diode Extremely Low Frequency (30–300 Hz range) Equal Lever For End Cross-Talk European Launching Group (broadcasting) Electronic Intelligence Electrical Line Interface Unit Greek Organization for Standardization (Greece) Entry Level System NetWare (networking) Electronic Security Edge Label Switch Router Electronic Sky Screen Equipment Ethernet LAN Service Unit Emergency Locator Transmitter (COMSAR) 1. “End of Medium” (character control code) 2. Engineering Model 3. Element Manager 4. Expanded Memory 1. Electronic Messaging Association (U.S.A.) 2. Electronic Missile Acquisition Editor MACros (text editor) ETSI MIS Advisory Group Electronic mail Electronic Mail Broadcast to A Roaming Computer (Motorola) Electromagnetic Compatibility (interference) Emission Control (propagation) 1. Equilibrium Mode Distribution (propagation) 2. Electromechanical Dialing (telephone exchange) 1. Electromagnetic Energy 2. Electromagnetic Environment 3. Externally Mounted Equipment 4. Earth-Moon-Earth (radio communications) Europe, Middle East and Africa (region) Name extension for Enhanced Metafile format (graphics) 1. Electromotive Force (parameter) 2. Electromagnetic Force (parameter) 3. Element Management Function 4. Enhanced Metafile (printer ﬁle) 5. European Multimedia Forum Electromyogram (medicine) 1. Electromagnetic Interference (noise) 2. Exchange Message Interface Element Management Layer (networking)

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Ee

EMM EMMA EMMSEC EMOS EMP EMPD Emph EMPS EMR EMRP EMS

EMT EMTUG EMU EMUG EMUT EMV EMW EN ENA ENC ENCB Endec ENET ENFIA ENG ENI ENIAC ENID ENN ENOB

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1. Entitlement Management Message (broadcasting) 2. Expanded Memory Manager (device driver) Enhanced Multimedia Architecture (broadcasting) European Multimedia Microprocessor Systems and Electronic Commerce (ICT) Equipment Management Operating System Electromagnetic Pulse Equilibrium Modal-Power Distribution (propagation) Emphasis (FM transmission) Electronic Mobile Payment Services (project) 1. Exchange Message Record (Telcordia Technologies) 2. Electromagnetic Radiation (hazard) Effective Monopole-Radiated Power (Intelsat) 1. Expanded Memory Speciﬁcation (standard) 2. European Mobile Satellite 3. Element Management System 4. Electronic Message Services 5. Enterprise Messaging Server 6. Enhanced Message Service (GSM) 7. Electromagnetic Susceptibility Electrical Metal Tubing European Manufacturing Technology User Group Electromagnetic Unit (parameter) European MAP Users Group Enhanced Manpack Ultrahigh-frequency Terminal Electromagnetic Vulnerability 1. Electromagnetic Wave 2. Electromagnetic Warfare Equivalent Node 1. Enterprise Network Addressing 2. Extended Network Addressing 1. Electronic Navigation Chart 2. encoder Estonian National Communication Board Encoder–decoder 1. Ethernet 2. Enhanced Network Exchange Network Facility for Interstate Access Electronic News Gathering Embedded Network Interface Electronic Numerical Integrator And Computer EGC (closed-) Network Identiﬁcation code (Inmarsat) Emergency News Network Effective Number Of Bits (ADC)

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110

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

ENOS ENQ ENR ENS ENSO ENT ENTELEC ENUM EO EOA EOB EOC EOD EOE EOF EOL EOP EOS

EOT EOTC EOW EP-DVB EPABX EPAC EPC EPD EPF EPFD EPG EPI

Enterprise Network Operating System (Sun Microsystems) “enquiry” (character control code) Excess Noise Ratio 1. Emergency Number Service 2. Enterprise Network Services (software) ETSI National Standardization Organization Equivalent Noise Temperature Energy Telecommunications and electrical Association Electronic Number 1. End Ofﬁce (networking) 2. Erasable Optical drive End-Of-Address (signal) End-Of-Block (signal) 1. Embedded Overhead Communication Channel (transmission) 2. Electro-Optic Coefﬁcient End-Of-Data (signal) Electronic Order Exchange End-Of-File (control character) 1. End-Of-Line (control character) 2. End-Of-Orbit life (satcom) 1. End-Of-Procedure frame 2. End-Of-Program 1. Earth Observation System (remote sensing) 2. Earth Observation Satellite 3. End-Of-Selection (control character) 4. Electro-Optical System 1. End-Of-Transmission (control signal) 2. End-Of-Tape (control signal) 3. End-Of-Text (ﬂag or marker) 1. European Organization for Testing and Certiﬁcation 2. Electro-Optic Technology Center Engineering Order-Wire (MUX) European Parliament Digital Video Broadcasting Electronic PABX Enhanced Perceptual Audio Coder Electric Power Conditioner Early Packet Discard (ATM) Electronic Payment Forum (www.epf.net) 1. Electronic Position-Fixing Device (GPS) 2. Equivalent Power Flux Density (microwave) Electronic Program Guide (broadcasting) Electronic Position Indicator

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Ee

EPIC

EPIISG EPIRB EPLANS EPLD EPLSR epndB EPN EPOC EPOS EPP EPPA EPPI EPR EPRI EPRML EPROM .eps EPS EPSCS EPSF EPSN EPU EQ EQL EQTV ER ERA ERB ERC ERD

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1. Electronic Privacy Information Center 2. Explicitly Parallel Instruction Computing (ICT) 3. European Project on Information infrastructure Co-ordination European Project on Information Infrastructure Starter Group Emergency Position-Indicating Radio Beacon (COMSAR) Engineering, Planning and Analysis System Electronically Programmable Logic Device (digital electronics) Enhanced Position Location Reporting System effective perceived noise decibel 1. Expansion Port Network 2. Esteeman Paging Network (Iran) Electronic Piece Of Cheese (operating system) Electronic Point Of Sale (ICT) 1. Enhanced Parallel Port (computer) 2. European Polar Platform European Public Paging Association Expanded Plan-Position Indicator Electron Paramagnetic Resonance (electronics) Electric Power Research Institute Extended Partial Response/Maximum Likelihood Erasable Programmable ROM (memory) Name extension for Encapsulated PostScript ﬁles (graphics) 1. Encapsulated Post-Script (image format) 2. Endless Phase Shifter Enhanced Private-Switched Communications Service Encapsulated Post-Script File Enhanced Private-Switched Network Expanded Processing Unit Equalizer, Equalization equalizer Extended Quality Television 1. Error Ratio 2. Equipment Room 3. Explicit Rate (ATM) European Research Area Emergency Radio Beacon 1. European Radiocommunications Committee 2. Electromagnetic Radiation Control Entity Relationship Diagram (ICT)

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E

112

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

ERL ERM ERMA ERMES ERN ERO ERP ERS ERSS ERTMS ERTS Es/No ES

ES-IS ESA

ESAS ESBAR Esc ESC ESCA ESCD ESCON ESD

ESDA ESDI ESDRAM

Echo Return Loss (transmission) 1. Enterprise Resource Management 2. Entity Relationship Model (ICT) 1. Electronic Recording Method Accounting 2. Electronic Recording Machine Accounting Enhanced Radio Messaging System (ETSI) Early Routing Node European Radiocommunications Ofﬁce (CEPT) 1. Effective Radiated Power (antenna parameter) 2. Enterprise Resource Planning (ICT) 3. European Remote-sensing Satellite European Remote Sensing Satellite The European Railway Trafﬁc Management System Earth Resources Technology Satellite (remote sensing) Energy per symbol to Noise power spectral density (ratio) 1. Earth Station 2. Electronic Switch 3. Expert Systems 4. Errored Seconds (MUX) 5. End System (ATM) 6. Exchange Service (BellSouth) 7. Enhanced Services End System to Intermediate System (protocol) 1. European Space Agency (France) 2. Emergency Stand-Alone 3. Electronic Spectrum Analyzer 4. Electronically Steered Array (microwave antennas) Electronic Service Activation System (Inmarsat) Epitaxial Schottky Barrier (diode) 1. Escape key (PC keyboard) 2. Engineering Service Circuits Egyptian Space Communications (Egypt) 1. European Speech Communication Association 2. Electron Spectroscopy for Chemical Analysis Extended System Conﬁguration Data (computer BIOS) Enterprise System Connectivity (service) 1. Electrostatic Discharge 2. Electrostatic Sensitive Device 3. Electronic Software Distribution 4. Error Signal Degrade (MUX) Electronic System Design Automation (ICT) Enhanced Small Device Interface (hard disk) Enhanced Synchronized Dynamic RAM (memory)

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Ee

ESF ESFMU ESG ESH ESI

ESL ESLNT ESM

ESMA ESMR ESMTP ESMU ESN ESnet ESNUG ESOs ESOC ESP

ESPA ESPAN ESPRIT ESQ ESR

1. Extended Super-Frame format (T-1 line) 2. European Science Foundation Extended Super-Frame Monitoring Unit Event Schedule Guide (broadcasting) End System Hello packet 1. Enhanced Serial Interface (computer) 2. End System Identiﬁer (ATM) 3. Equivalent Step Index (proﬁle) 4. Environmental Sensing Instrument Equivalent Series inductance (electronics) Equivalent Satellite Link Noise Temperature 1. Extended Subscriber Module 2. Electronic warfare Support Measure 3. Electronic Support Measure 4. Element and Subnetwork Manager Extended Subscriber Module-100 A Enhanced Specialized Mobile Radio (cellular networks) Extended Simple Mail-Transfer Protocol Extended Subscriber Module-100 URBAN 1. Electronic Security Number (GSM) 2. Emergency Services (telephone) Number 3. Electronic-Switched Network Energy Science network E-mail Synopsis User Group European Standardization Organizations European Space Operations Center 1. Enhanced Serial Port (computer) 2. Enhanced Service Provider 3. Encapsulating Security Payload 4. Ethernet Service Provider 5. Earth Surface Potential 1. European Selective Paging Association 2. Educational Software Publishers Association (e-learning) Enhanced Switch Port Analyzer European Strategic Program for Research in Information Technology End System Query packet 1. Equivalent Series Resistance (electronics) 2. Electronic Spin Resonance (microwave) 3. Errored Seconds Ratio

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113

E

114

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

ESS EST ESTEC ESTO ESU ESZ ET ETA ETACS ETB

ETC ETCP ETDM ETDMA ETE ETF ETFTP EtherLEC ETI ETIS ETITO ETL ETM ETN ETNOA ETNS ETO ETPI ETR ETRA ETRF ETRI

1. Electronic Switching System (Lucent Technologies) 2. Event Synchronization System Electroshock Therapy European Space Research and Technology Center (Netherlands) European Science and Technology Observatory Electrostatic Unit (parameter) Emergency Service Zone Exchange Termination Electronic Technicians Association Extended TACS (British cellular) 1. End of Transmission Block (control character) 2. Electronic Term Book 3. Electronic Test Bed 4. Engineers Tool Box 1. Enhanced Throughput Cellular (protocol) 2. Earth Terminal Complex 3. Electronic Toll Collecting Electrolytic Tough-pitch Copper (wires) Electrical Time-Division Multiplexing Extended TDMA (access) Equivalent Telephone Erlangs European Telecsonferencing Federation Enhanced Trivial FTP (networking) Ethernet Local Exchange Carrier Electronic Telephone Interface European Telecommunication Informatics Services Electro-Technology Industry Training Organization Embedded Transmission Line (microwave) 1. Electronic Ticketing Machine 2. Enhanced Thermic Mapper (remote sensing) Electronic Tandem Network European Telecommunications Network Operations Association Emergency Telephone Number System European Telecommunications Ofﬁce Eastern Telecommunications of Philippines Inc. 1. ETSI Technical Report 2. Effective Transmission Rate 3. Estimated Time of Repairing Egyptian Telecommunications Regulatory Authority Electrically Tuned RF (ﬁlter) Electronics & Telecommunications Research Institute (Korea)

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Ee

ETS

ETSA ETSI ETT ETTM ETV ETX EU EUC EUCL EUI-48 EUI-64 EULA Eumetsat EUNet EURESCOM Euro ISDN EUROBIT EUROCAE EUT EUTOTELDEV Eutelsat EUTP EUV eV EV EVPRT EV-DO EVA EVC EVDV EVM EVR

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1. European Telecommunication Standard (GSM) 2. European Technology Services 3. Engineering Test Satellite (Japan) 4. Effective Transmission Speed 5. ETSI Technical Speciﬁcation 6. Electronic Tandem Switching 7. Ethernet Terminal Server 8. Electronic Technology Systems European Telecommunication Services Association European Telecommunications Standardization Institute (France) Electro Thermal Thruster Electronic Toll and Trafﬁc Management 1. Educational TV (e-learning) 2. European Training Village (e-learning) End-of-Transmission (control character) European Union Extended UNIX Code End User Common Line charge Extended Unique Identiﬁer-48 (bits) Extended Unique Identiﬁer-64 (bits) End-User License Agreement (softwares) European Meteorological Satellite (organization) European UNIX Network European institute for Research and Strategic studies in Telecommunications European ISDN European Association of Business Machine Manufacturers and Information Technology European Organization for Civil Aviation Electronics Equipment Under Test European Telecommunication Development European Telecommunications Satellite (organization) Enhanced Unshielded Twisted Pair Extreme Ultra-Violet electronvolt (unit of energy) European Videotelephony Event Printer Evolution Data Only services Electronic Value Added Enhanced Video Connection (standard) Evolution Data Voice Error Vector Magnitude Electronic Video Recording

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EVRC EW EWOS EWP EWSD EWSM EWTIS EXCA EXCSA .exe EXM EXOR EXOS EXP ext EXT EXTN EXZ EYP EZ

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Enhanced Variable Rate voice Coder Electronic Warfare (interference) European Workshop for Open Systems Electronic White Pages Elektronisches Wahl System Digital (Siemens Switching system) Electronic Warfare Support Measure European Waters Trafﬁc Information System Exchangeable Card Architecture Exchange Carrier Standards Association Filename extension for executables programes (computer) Exit Message Exclusive OR (digital gate) 1. Extension Outside 2. Exospheric Satellite expansion external extension extension Excessive Zeros (data encoding) Electronic Yellow Pages East Zone beam

AU5866—CHAPTER E—E—12/7/2007—11:18—GANESHV—274407—XML MODEL E – pp. 99–116

Ff f F

F key F Port F-BCCH F-ES F/D F/O F/V F/V-V/F F33 F55 F77 fA FA FAA FAC

F

1. Symbol for preﬁx femto-, denoting 10K15 2. Symbol for Frequency 1. Symbol for Farad (unit of capacitance) 2. Symbol for Filament of tubes (electronics) 3. Symbol for Focal length 4. Symbol for Fixed service (ITU-T) Function key Fabric Port Fast Broadcast Control Channel Fixed End System Focal Length-to-Diameter (ratio) Fiber Optics Frequency-to-Voltage (converter) Frequency-to-Voltage or Voltage-to-Frequency (converter) Fleet 33 (Inmarsat terminal) Fleet 55 (Inmarsat terminal) Fleet 77 (Inmarsat terminal) femtoampere Fault Alarm 1. Federal Aviation Administration 2. Frequency Assignment Authority 1. Forced Authorization Code 2. Final Assembly Code (GSM mobile station) 117

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FACC FACCH FACOM FACS FACT FACTE FAD FADS FAL FALU FAM FAMA FAN FANE FANP FANS fanzine FAP FAQ FAR FARNet FAS FASIC FASSET FAST FAT FATAM FAU FAW FAX FB FBBC

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Ford Aerospace & Communications Corporation (company) Fast Associated Control Channel (GSM) Fully Automatic Computer Facilities Access Control System 1. Fabrication And Continuity Test Program (Intelsat) 2. Fairchild Advanced CMOS Technology (electronics) Fujitsu Access & Transport Equipment Function Access Domain Force Administration Data System Frame Alignment Loss (MUX) Floating-point Arithmetic Logic Unit (computer) Fast Access Memory Fixed-Assigned Multiple Access 1. Flexible Access Network 2. Far Area Network Flexible Access Network Element Flow Attribute Notiﬁcation Protocol (routing) Future Air Navigation System (aviation) An online magazine for fans of a particular group of persons 1. Fuse Alarm Panel 2. Formats And Protocols Frequently Asked Questions (ICT) 1. Federal Aviation Regulation 2. False Alarm Rate Federation of American Research Network 1. Frame Alignment Signal (MUX) 2. Frame Acquisition and Synchronization 3. Facility-Associated Signaling Function and Algorithm-Speciﬁc Integrated Circuit Functional Advanced Satellite System for Evaluation and Test Fairchild Advanced Schottky TTL (electronics) 1. File Allocation Table (computer) 2. Factory Acceptance Tests File Application, Transfer, Access, and Management Fixed Access Unit (wireless) Frame Alignment Word (MUX) short term for Facsimile Equipment/Machine 1. Framing Bit 2. Fine Business (Morse code transmissions) 3. Frequency Correction Burst (GSM) Full Baud Bipolar Coding

AU5866—CHAPTER F—F—12/7/2007—12:26—GANESHV—274408—XML MODEL E – pp. 117–128

Ff

FBC FBG FBO FBSS FBT FBU FBus FBW FBWA FBX FC

FC and PC FC Switch FC-0 FC-1 FC-2 FC-3 FC-4 FC-AL FC-EL FC-PGA FC-PH FCA

FCAPS FCB FCBGA FCC FCCH FCCRP FCD FCI

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Facility-Based Carrier Fiber Bragg Grating Facilities-Based Operator (VPNs) Full Band Spread Spectrum Fused Biconic Taper 1. Functional Business Unit 2. Failed Before Utilization (Bellsouth) Frame Transport Bus 1. Forward Band Working (Intelsat) 2. Fractional Bandwidth Fixed Broadband Wireless Access Fujitsu Broadband Cross-connect Node 1. Feedback Control 2. Frame Control (networking) 3. Fiber-optic Connector (NTT) 4. Fiber Channel 5. Forecast Center Station (Intelsat) Face Contact and Point Contact Fiber Channel Switch Fiber Channel level 0 Fiber Channel level 1 Fiber Channel level 2 Fiber Channel level 3 Fiber Channel level 4 Fiber Channel-Arbitrated Loop (networking) Fiber Channel-Enhanced Loop (networking) Flip Chip-Pin Grid Array (microchips) Fiber Channel Physical Standard 1. Fiber Channel Association (U.S. standards organization) 2. Flip-Chip Assembly 3. Free Carrier Fault, Conﬁguration, Accounting, Performance, and Security File Control Block (MS-DOS) Flip-Chip Ball Grid Array (microchips) 1. Federal Communications Commission (standards) 2. Flexible Control Cable Frequency Correction Channel (GSM) Federal Communications Commission Registration Program Facility Completion Date Forward Call Indicator

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F

120

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FCIA FCIP FCLC FCN FCOS FCOT FCS

FCSI FCT FCW FD FDB FDC FDCC FDCCH FDD FDDI FDE FDF FDFD FDHM FDHP FDI FDL FDM FDMA FDP FDPL FDR FDS FDTD FDX

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Fiber Channel Industry Association Fiber Channel over IP (Cisco) Fiber Channel Loop Community function Feature Class Of Service Fiber Control Ofﬁce Terminal 1. Frame Checking Sequence (transmission) 2. Fraud Control System (MCI) 3. Facility Control System 4. Federation of Communication Services (U.K.) 5. Fiber Channel Speciﬁcation Fiber Channel System Initiative (IBM) 1. Fixed Cellular Terminal 2. Fast CMOS Technology 1. Federal Computer Week (magazine) 2. Fiber Cutoff Wavelength (ﬁber optics) Functional Description (Intelsat) 1. Fahrenheit Dry Bulb 2. Functional Description Block (Intelsat) 1. Flight Dynamics and Commanding (Intelsat) 2. Floppy Disk Controller (computer) Forward Control Channel Forward Digital Control Channel (cellular networks) 1. Floppy Diskette Drive (computer) 2. Frequency-Division Duplexing (transmission) Fiber Distributed Data Interface (LANs) Frequency Domain Equalizer Fiber Distribution Frame Finite Difference Frequency Domain Full Duration at Half Maximum Full Duplex Handshaking Protocol Feeder Distribution Interface (switching) Facilities Data Link (T-1) Frequency-Division Multiplexing Frequency-Division Multiple Access 1. Fiber-optic Distribution Panel 2. Fractional Degradation of Performance Foreign Data Processor Link (PBX) Frequency Domain Reﬂectometry (microwave) Frequency-Division Switching Finite Difference Time Domain Full-Duplex (transmission)

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Ff

FE FEA FEBE FEC

FECC FECCOD FECDEC FECM FECN FED FEFO FEI FEL FEM FEMA FEN FENS FEP FER FERF FERL FERM FES

FET FETA FEX FEXT FF FFDI

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1. Functional Entity 2. Format Effector (control character) 1. Field-Emitter Array (displays) 2. Finite-Element Array (microchips) Far-End Block Error (MUX) 1. Forward Error Correction (transmission) 2. Forwarding Equivalence Class 3. Far-End Cross talk 4. Future ECM Computer 5. Flexible Etched Circuits Federal Emergency Communications Coordinator FEC Encoder FEC Decoder Future Entitlement Control Message Forward Explicit Congestion Notiﬁcation (frame relay) 1. Field Emission Display (TV and monitor) 2. Fire Emitting Diode 3. Frequency Error Detector First Ended, First Out Federation of the Electronics Industry (United Kingdom) Free Electron Laser Finite-Element Method Federal Emergency Management Agency Feeder Echo Noise (antenna) Fujitsu-Enhanced Network Management System 1. Front-End Processor (network computer) 2. Fluorinated Ethylene Propylene-insulated wire Frame Error Rate Far-End Remote Failure alarm (MUX) Further Education Resource For Learning (ICT) Forward Explicit Rate Management (ATM) 1. Fixed Earth Station 2. Frequency Exchange Signaling 3. Field-Emission Spectroscopy (electronics) 4. Fixed End System Field-Effect Transistor (semiconductors) FET Ampliﬁer Foreign Exchange Trunk Far-End Cross-Talk (transmission) 1. “Form Feed” (printer function) 2. Flip-Flop 3. Fast Forward Fast Fiber Data Interface

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F

122

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

FFL FFM FFO FFOL FFP FFS FFSK FFT FFTDCA FG FGA FGB FGC FGC-EA FGCPW FGD FGD-EA FGDC FGM FGS FH FH-CDMA FHMA FHSS FIA FIB FIC FICON FID FIF FIFO FIGS FILO FIN FIPS FIR FIRM FIRMR FIRST FIS FISINT

Front Focal Length (ﬁber optics) Flat Fade Margin Fixed-Frequency Oscillator Fiber Flow On LAN Federation of Functional Processor Flash File Standard Fast FSK (modulation) 1. Fast Fourier Transform (algorithm) 2. Fast File Transfer Final-Form Text Document Content Architecture Functional Group (ATM) Feature Group A Feature Group B Feature Group C Feature Group C and Equal Access Finite Groundplane Coplanar Waveguide (microwave) Feature Group D Feature Group D and Equal Access Federal Geographic Data Committee Fixed Gain Mode Felicity Grounding System Frequency-Hopping (transmission) Frequency-Hopping—CDMA (access) Frequency-Hopping Multiple Access Frequency-Hopping Spread Spectrum (transmission) Fiber-optic Industry Association Forward Indicator Bit (SS7 message) Flight Information Center (aviation) Fiber Connectivity (IBM) Field Identiﬁer (ISDN) Fractal Image Format “First In, First Out” (buffer memories) Figure Shift “First In, Last Out” (memory and data communication) Field Inspection Notice Federal Information Processing Standards 1. Finite Impulse Response (ﬁlter) 2. Fast Infrared (port) Functionally Integrated Resource Manager Federal Information Resource Management Regulation Forum of Incident Response and Security Teams (organization) Forms Interchange Standard Foreign Instrumentation Signal Intelligence

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Ff

FISK FISO FISU FIT FITE FITL FIU FIX FK FL FLAG FLB FLC FLCD FLEC FleetBB .ﬂi FLINK FLIR FLL FLM FLOP FLOPS FLR FM FM-band FM/AM FM/PM FMA FMAS FMB FMBS FMC FMCW

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Fax a disk (sending information on phone line) Fast In, Slow Out (memories) Fill-In Signal Unit (SS7 message) Failures In Time Forward Interworking Telephony Event Fiber-In-The-Loop Facsimile Interface Unit Federal Internet Exchange Foreign Key 1. Fiber Line 2. Fault Locating Fiber-optic Link Around the Globe (Cable Consortium) Facility Loop Back 1. Fiber Loop Carrier 2. Ferroelectric Liquid Crystal Ferroelectric Liquid-Crystal Display Forward-Looking Economic Cost Fleet Broad-Band (Inmarsat) Name extension for animation ﬁles in the FLI ﬁle format Combination of a Flash and a Wink signal Forward-Looking Infrared unit Fiber-in-the-Loop-Local Fujitsu Lightwave Multiplexer Floating-point Operation Floating-point Operations Per Second (computer speed) Forward-Looking Radar 1. Frequency Modulation 2. Full Modulation 3. Fault Management Frequency Modulation band ranging from 88 to 108 MHz Amplitude Modulation of a carrier by subcarriers that are Frequency-Modulated by information Phase Modulation of a carrier by subcarriers that are Frequency-Modulated by information Fixed-Mount Antenna Facility Maintenance and Administration System Frame Marker Bus Frame Mode Bearer Service 1. Fixed Mobile Convergence (service) 2. Forward Motion Compensator (remote sensing) Frequency-Modulated Continuous Wave (radar)

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F

124

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

FMFB FMI FMIC FMIF FMLB FMS FMT FMV FN FNA FNC FNPA FNPRM FNR FNS FO FOA FOB FOBP FOC

FOCC FOCUS FOD FODA FODU FOG FOI Act FoIP FOIRL FOL FOM FOMA FORTRAN FOSDIC FOSSIL

Frequency Modulation Feedback Fixed Mobile Integration Flexible MVIP Interface Circuit FM Improvement Factor First Make/Last Break (connectors) 1. Fleet Management Service 2. Flight Management System 3. Flexible Manufacturing System (ICT) Fade Migration Technique Fair Market Value Frame Number (GSM) Functional Network Architecture Federal Networking Council (NASA) Foreign Numbering Plan Area Further Notice of Proposed Rule-Making (FCC) 1. Fixed Network Reconﬁguration 2. Faculty Network Resources 1. Fiber Network Systems 2. Fiber Network Service Fiber Optics 1. Fiber-Optic Ampliﬁer 2. Fiber-Optic Association, Inc. 3. First Ofﬁce Application Free Onboard (contracts) Fractional Out-of-Band Power 1. Firm Order Conﬁrmation 2. Fiber-Optic Combiner 3. Fiber-Optic Connector 4. Full Operational Compatibility Fiber-Optic Cable Component Federation On Computing in the United States Fax-On-Demand FIFO-Ordered Demand Assignment Fiber-Optic Distribution Unit Fiber-Optic Around the Golf (cable consortium) Freedom Of Information Act Fax over IP Fiber-Optic Inter-Repeater Link (IEEE) Fiber-Optic Link Fiber-Optic Modem Freedom Of Multimedia Access Formula Translation (programming language) Film Optical Sensing Device for Input to Computer Fido/Opus/Seadog Standard Interface Layer

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Ff

FOT FOTM FOTP FOTS FOV FOWM FOX FP FPBGA FPCB FPD FPDL FPG FPGA FPH FPI FPIC FPID FPIS FPLA FPLMTS FPM DRAM FPN FPODA FPP fps FPS

FPSLIC FPT FPU FQDN

&

125

1. Fiber-Optic Transmitter 2. Frequency of Optimum Transmission Fiber-Optic Test Method Fiber-Optic Test Procedure 1. Fiber-Optic Transmission System 2. Fiber-Optic Telemedicine System Field Of View (remote sensing) Fiber-Optic Well Monitoring Fiber-Optic extender 1. Feature Package (software) 2. File Processor 3. Floating Point Fine-Pitch Ball Grid Array (microchips) Field-Programmable Circuit Board 1. Full Page Display 2. Flat Panel Display Foreign Processor Data Link (Rockwell) Feature Planning Guide 1. Field-Programmable Gate Array (digital electronics) 2. Fine-Pitch Grid Array (microchips) Free Phone (INs) Formal Public Identiﬁer Field-Programmable Interconnect Chip Field-Programmable Interconnect Device Forward Propagation Ionospheric Scatter (ﬁber optics) Field-Programmable Logic Array (digital electronics) Future Public Land Mobile Telecommunication System (ITU) Fast Page Mode Dynamic RAM (memory) Floating-Point Number Fixed Priority-Oriented Demand Assignment (access technique) 1. Fixed Path Protocol 2. Fiber-optic Patch Panel frames per second (video images) 1. Fast Packet Switching 2. Fault Protection Subsystem (power) 3. Focus Projection and Scanning 4. First Person Shooter (video games) 5. Frames Per Second (video or 3D games) Field-Programmable System-Level IC Forced Perfect Terminator (IBM) Floating-Point Unit (circuit) Fully Qualiﬁed Domain Name (Internet)

AU5866—CHAPTER F—F—12/7/2007—12:27—GANESHV—274408—XML MODEL E – pp. 117–128

F

126

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

FQFP FR FRA FRAD FRAM FRBS FRC FRCID FRD FRED FREE FreeBSD Freq FRF FRL FRLP FRM FRMR FRND FRP FRS

FRSE FRSP FRST FRTE FRTT FRU fs FS

Fine-pitch Quad Flat Pack 1. Frame Relay (access protocol) 2. Full Rate codec 3. Flat Rate Service Fixed Radio Access (WLLs) 1. Frame Relay Access Device 2. Frame Relay Assembler/Disassembler Ferroelectric RAM (memory) Frame Relaying Bearer Service Functional Redundancy Checking Frame Relay Cable Interface Device Fire Retardant (cables) Fast Recovery Epitaxial Diode Forum for Responsible and Ethical E-mail Free Berkeley Software/Standard Distribution (ICT) 1. Frequency 2. File request 1. Frame Relay Forum 2. Frequency Response Function Facility Restriction Level (AT&T) Forward and Return Link Pair (Inmarsat) 1. Focus–Rotation Mount 2. Fixed-Reference Modulation Frame Reject Frame Relay Network Device Fast Reservation Protocol 1. Flat Rate Service 2. Frame Relay Service 3. Family Radio Service 4. Field Routing System Frame Relay Switching Equipment Frame Relay Service Provider Foundation for Research Science & Technology (New Zealand) Frame Relay Terminal Equipment Fixed Round-Trip Time Field Replacement Unit femtosecond (10K15 s) 1. Fixed Service (Intelsat) 2. Fix Stuff (MUX) 3. File Separator 4. Full Scale (test equipments) 5. Field Strength 6. Frame Status (networking)

AU5866—CHAPTER F—F—12/7/2007—12:27—GANESHV—274408—XML MODEL E – pp. 117–128

Ff

FSAA FSAN FSAPT FSB FSBS FSC FSCS FSD FSDPSK FSF FSK FSL

FSN FSO FSOQ FSP FSR FSS FST FSTC FSTS ft ft2 ft/min ft3/min ft/s FT FT-1 FT-3 FTA FTAM FT Bus

&

Full Screen Anti-Aliasing (ICT) Full Services Access Network (ATM-based optical network) Faculty of Scientiﬁc-Applied Post and Telecommunications (Iran) Front Side Bus (computer) Frame Switching Bearer Service 1. Fiber-Switched Capable (GMPLS) 2. Frequency Spectrum Congestion (transmission) Frequency-Selective Conducting Surface Frequency Spectrum Designation (propagation) Filtered Symmetric Differential PSK (modulation) 1. Free Software Foundation 2. Frequency Scaling Factor Frequency-Shift Keying (modulation) 1. Fiber Subscriber Loop 2. Free Space Loss 3. Flexible Service Logic 4. Facsimile Signal Level 1. Full Service Network 2. Forward Sequence Number (GSM) 1. Foreign Switching Ofﬁce 2. Free Space Optics Frequency Shift Offset Quadrature (modulation) 1. File Service Protocol 2. Fiber-optic Splice Panel 1. Full-Scale Range 2. Full Sheet Resonance 1. Fixed Satellite Service frequency band (ITU) 2. Frequency-Selective Surface Frequency-Shift Telegraphy Financial Services Technology Consortium Federal Secure Telephone System foot square foot foot per minute cubic foot per minute foot per second France Telecom (company) Functional T-1 Functional T-3 Federal Telecommunications Act File Transfer, Access & Management (protocol) Frame Transport Bus

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127

F

128

&

FTC FTE FTIP FTL FTMSC FTNS FTP FTS FTSC FTT FTTB FTTC FTTCab FTTH FTTL FTTN FTTO FTTP FTTS FU FUNI FUT fV FVC FVO FVR fW FWA FWHM FWLL FWM FX FXC FXO FXS FZA

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Fast Time Constant (algorithm) 1. Facsimile Terminal Equipment 2. Full-Time Equivalent (call center) Fiber Transport Inside Plant Flash Translation Layer (PCMCIA standard) France Telecom Mobile Satellite Communications Fixed Telecommunications Network Service 1. File Transfer Protocol (networking) 2. Foil Twisted Pair (cables) 1. File Transfer Support 2. Finite Time Stability (ATM) 1. Federal Telecommunication Standards Committee 2. FidoNet Technical Standards Committee Fault-Tracing Time 1. Fiber-To-The-Building (ﬁber optics) 2. Fiber-To-The-Business (ﬁber optics) Fiber-To-The-Curb (ﬁber optics) Fiber-To-The-Cabinet (ﬁber optics) Fiber-To-The-Home (ﬁber optics) Fiber-To-The-Loop (ﬁber optics) Fiber-To-The-Neighborhood (ﬁber optics) Fiber-To-The-Ofﬁce (ﬁber optics) Fiber-To-The-Premise (ﬁber optics) Fiber-To-The-Subscriber (ﬁber optics) Frame Unit Frame-based User–Network Interface (ATM) Fiber Under Test femtovolt 1. Forward Voice Channel 2. Frequency-to-Voltage Converter (electronics) Field Veriﬁcation Ofﬁce Flexible Vocabulary Recognition femtowatt 1. Fixed Wireless Access 2. Forward-Wave crossed-ﬁeld Ampliﬁer (electronics) Full Width at Half Maximum (pulse) Fixed Wireless Local Loop Four-Wave Mixing (ﬁber optics) 1. Foreign Exchange (service) 2. Fixed service Fiber switch Cross-Connect Foreign Exchange Ofﬁce Foreign Exchange Station Fresnel Zone Antenna

AU5866—CHAPTER F—F—12/7/2007—12:27—GANESHV—274408—XML MODEL E – pp. 117–128

Gg

g G

G-M counter G-MSC G/A G/G G/T G2 G2B G2C G2G G3 Fax G4 Fax

G

1. Symbol for acceleration due to Earth’s gravity (9.81 m/s2) 2. Symbol for gram (unit of weight) 1. Symbol for preﬁx giga-, denoting 109 or 230 2. Symbol for Gauss (unit of magnetic induction) 3. Symbol for Grid of tubes (electronics) 4. Symbol for Gravitational force 5. Symbol for Gate (FETs) 6. Symbol for electrical conductance 7. Symbol for Gain (antennas and ampliﬁers) Geiger–Mu¨eller counter (electronics) Gateway Mobile Switching Center (GSM) Ground-to-Air communication Ground-to-Ground communication Gain-to-noise Temperature (ratio) Symbol for Intelligence, meaning secret information (U.S. Army) Government-to-Business (e-commerce) Government-to-Consumer (e-commerce) Government-to-Government (e-commerce) Group 3 Fax system Group 4 Fax system 129

AU5866—CHAPTER G—G—12/7/2007—10:57—GANESHV—274409—XML MODEL E – pp. 129–137

130

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

GA GaALAs GAAP GaAs GaAsFET GaAsP GAB GAC GAGAN GAL GaInAs GAM GaN GAN GaP GAP GARP GARS GAT GATM GAW GAZEL Gb Gb/s GbE Gbps GB GBAS GBCS GBH GBIC GBM

1. Go Ahead (telex) 2. General Assembly (ETSI) 3. Generally Available (contracts) Gallium–Aluminum–Arsenide (semiconductors) Generally Accepted Accounting Principles Gallium–Arsenide (semiconductors) Gallium–Arsenide FET (semiconductors) Gallium–Arsenide Phosphide (semiconductors) 1. Group Access Bridging (service) 2. Group Audio Bridging 3. Group Asynchronous Browsing 1. Global Area Coverage 2. Government Advisory Committee (Internet) GPS And GEO Augmentated Navigation (India) Generic Array Logic (digital electronics) Gallium–Indium–Arsenide (semiconductors) GPS-Aided Munitions Gallium Nitride (semiconductors) Global Area Network (Inmarsat) Gallium Phosphide (semiconductors) 1. Generic Access Proﬁle (DECT) 2. Ground-to-Air Paging 3. Generic Access Proﬁle (Bluetooth) 1. Generic Attribute Registration Protocol (VLANs) 2. Global Atmospheric Research Program 3. Growth At a Reasonable Price Geological Applications for Remote Sensing 1. Generic Addressing and Transport Protocol 2. Go Ahead Tone (ﬁber optics) Global Air Trafﬁc Management (aviation) Global Atmosphere Watch Global Arizona E-Learning (E-learning) 1. Gigabit, which is 1,000,000,000 bits (transmission) 2. Gilbert (unit of magnetomotive force) Gigabit per second Gigabit Ethernet Gigabits per second (transmission) Gigabyte, which is 230 or 1024 times Megabyte (computer) Ground-Based Augmentation System Global Business Communications Systems (AT&T) Group Busy Hour (MUX) Gigabit Interface Converter (Ethernet) Gulf Business Machines (Abu Dhabi)

AU5866—CHAPTER G—G—12/7/2007—10:57—GANESHV—274409—XML MODEL E – pp. 129–137

Gg &

GBN GBR GC GCA GCAC GCD GCE GCF GCI GCMD GCOM GCPW GCRA GCS

GCT GD GDDM GDE GDF GDG GDHS GDI GDMO GDN GDOP GDPS GE GEA GEANet GEDCOM GEM GEMS GEN Gencam

131

GPRS Backbone Network Ground-Based Radar Global Coverage 1. Game Control Adapter (computer) 2. Ground-Controlled Approach (radar system) 3. Gain-Controlled Ampliﬁer Generic Connection Admission Control (ATM) Great Circle Distance Ground Communications Equipment Global Certiﬁcations Forum (GSM) 1. Graphic Character Internal (Siemens) 2. Ground-Controlled Interception (radar) Global Change Master Directory (NASA) Global Climate Observation Mission (remote sensing) Grounded Coplanar Waveguide (microwave) Generic Call Rate Algorithm (ATM) 1. Ground Control Station 2. Global Communications Service 3. Governmental Communication Systems 4. Gate-Controlled Switch (electronics) Greenwich Civil Time (UTC) Graceful Discard (frame relay) Graphical Data Display Manager (SNA) Group-Delay Equalizer Group Distribution Frame (MUX) Global Development Gateway (World Bank) Ground Data Handling System Graphics Device Interface (MS Windows) Guidelines for the Deﬁnition of Managed Objects Graphic Display Network Geometric Dilution Of Precision Global Data Processing System 1. Gigabit Ethernet 2. Good Evening (Morse code transmissions) Gigabit Ethernet Alliance Gigabit European Academic Network (ﬁber network) Genealogical Data Communication (data exchange format) 1. Graphics Environment Manager 2. Gateway of Educational Materials (E-learning) Global Environmental Monitoring System (United Nations) generator Generic Computer-Aided Manufacturing (ICT)

AU5866—CHAPTER G—G—12/7/2007—10:57—GANESHV—274409—XML MODEL E – pp. 129–137

G

132

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

GENTEX GENIAC GENIE GEO GEOS GEOSS GEQ GERAN GES GETS GeV GF GFC GFCI GFE GFI GFLOPS GFM GFP GFSK GFXO GFXS GGP GGRF GGSN GH Effect GHOST GHz GI GIAC GIC GID GIDEP .gif GIF

General Telex Genius Almost-Automatic Computer General Electric Network for Information Exchange 1. Geostationary Earth Orbiting (satellite) 2. Geosynchronous Earth Orbiting (satellite) Geoworks Operating System Global Earth Observation System of Systems (remote sensing) Gain Equalizer GSM–Edge Radio Access Network (GSM) Ground Earth Station (Inmarsat) Government Emergency Telecommunications Service Gigaelectronvolt (109 eV) Gold Franc (billing) Generic Flow Control (ATM) Ground Fault Circuit Interrupter (circuit breaker) Government Furnished Equipment 1. Group Format Identiﬁer (packet switching) 2. Ground-Fault Interrupter (circuit breaker) One billion Floating-point Operations Per Second (computer) Graphics File Manager 1. Generic Framing Procedure 2. Global Function Plane (INs) 3. Ground Fault Protector Gaussian FSK (modulation) Ground start FXO Ground start FXS Gateway-to-Gateway Protocol (DARPA) GSM Global Roaming Forum Gateway GPRS Support Node (cellular networks) Gordon-Hous Effect (transmission) GSM Hosted SMS Teleservices Gigahertz (109 Hz) Grade Index (ﬁber optics) Global Incident Analysis Center 1. General Instrument Corporation 2. Gigabit Interface Converter 3. Geomagnetically Induced Current GARP Information Declaration Government and Industries Data Exchange Program Name extension for GIF format ﬁles (graphics) Graphical Interchange Format (imaging)

AU5866—CHAPTER G—G—12/7/2007—10:57—GANESHV—274409—XML MODEL E – pp. 129–137

Gg &

Gig Gig-E GIGAMO GIGO GII GIIC GILC GILS GIM GIMP GIP GIS

GISIS GITS GIX GJISI GJXDM GKP GKS GL GLIS GLONASS GLR-L GLR-N GM Gmax GMCR GMD GMDSS GMES GMII GMP GMPCS GMPLS GMR GMRP

133

1. Gigabits per second 2. Gigahertz per second Gigabit-Ethernet Gigabyte-class Magneto-Optical (storage technology) Garbage In, Garbage Out (computer) Global Information Infrastructure Global Information Infrastructure Commission Global Internet Library Campaign Government Information Locator Service Group Identiﬁcation Mark (cellular networks) GNU Image Manipulation Program (software) 1. GSM/DECT Interworking Proﬁle 2. Graded-Index Proﬁle (ﬁber optics) 3. GARP Information Protocol 1. Geographical Information System (ICT) 2. Geeky Internal Stuff (database) 3. General Information Services 4. General Information Sessions 5. Global Information Society 6. Geospatial Information System Global Integrated Shipping Information System (IMO) Government Information Technology Service Global Internet Exchange Global Justice Information Sharing Initiative Global Justice XML Data Model (U.S.A.) Global Knowledge Partners Graphical Kernel System Graphics Library Global Land Information System Global Orbiting Navigation Satellite System (Russia) Global Location Register—Local (mobile networks) Global Location Register—Network (mobile networks) Good Morning (Morse code transmissions) maximum Gain Globe-Mackay Cable and Radio Corporation Guaranteed Message Delivery Global Maritime Distress and Safety System (COMSAR) Global Monitoring for Environmental and Security Gigabit Media-Independent Interface Global Managed Platform Global Mobile Personal Communication System (ITU-T) Generalized Multiprotocol Label Switching Giant Magneto Resistance effect GARP Multicast Registration Protocol (networking)

AU5866—CHAPTER G—G—12/7/2007—10:57—GANESHV—274409—XML MODEL E – pp. 129–137

G

134

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

GMS GMSC GMSK GMT GN GNCT GND GNE GNMC GNN GNOME GNSS GNU GO-MVIP GOES GOF GOGO GU GOLD GOM GOME GOMOS GOMS GOPS GORIZONT GORS GoS GOS GOSAT GOSIP GPA GPC GPCL GPF .jpg GPI

GPIB

1. Geostationary Meteorological Satellite 2. Generic Maintenance System Gateway Mobile Switching Center Gaussian-ﬁltered MSK (GSM modulation) Greenwich Mean Time Good Night (Morse code transmissions) Generalized No Circuit Treatment Ground (electronics) Gateway Network Element (SONET) Global Network Management Center Global Network Navigator (Web-based information service) GNU Object Model Environment Global Navigational Satellite System (U.S.A.) GNU’s Not Unix Operating System Global Organization for MVIP, Inc. (U.S.A.) 1. Geostationary Operational Environmental Satellite 2. Geostationary Orbiting Earth Satellite Glass Optical Fiber Government-Owned, Government-Operated Gigaohm (electronics) Global Online Directory Generic Object Model Global Ozone Monitoring Experiment Global Ozone Monitoring System (remote sensing) Geostationary Operational Meteorological Satellite One billion Operations Per Second (computer) The Russian geostationary telecommunications satellite General Organization of Remote Sensing (Syria) Grade of Service Global Observing System Greenhouse gas Observing Satellite Government Open System Interconnection Proﬁle (OSI model) General Purpose Adapter (AT&T) Gateway Protocol Converter General Premises Cabling License General Protection Fault (MS Windows) Name extension for JPEG format ﬁles (graphics) 1. GTI Physical Interface 2. GammaFax Programmers Interface 3. Glide Path Indicator 4. Ground Position Indicator General-Purpose Interface Bus (computer)

AU5866—CHAPTER G—G—12/7/2007—10:57—GANESHV—274409—XML MODEL E – pp. 129–137

Gg &

GPIRS GPL GPM GPoP GPR GPRS GPS GPTC GPU GQFP GR GRC GRE GREJ GREP GRIC GRID GRIN GRM GRSU GRX GS GS Trunk GSA GSC GSDN GSF GSI GSM GSM-900 GSM-R GSMA GSMP GSMPLMN GSN GSO

135

Global Positioning Inertial Reference System 1. General Public License (Free Software Foundation) 2. Graphical Programming Language Global Precipitation Measurement (remote sensing) Global Point of Presence Ground-Penetrating Radar General Packet Radio Service (cellular network) 1. Global Positioning System 2. Global Position Spotting General Post and Telecom Company (Libya) Graphics Processing Unit (computer) Guard-ring Quad Flat Pack Generic Requirements (Telcordia Technologies) Ground Return Circuit Generic Router Encapsulation (Internet) Group Reject Generalized Regular Expression Parser (Unix utility) Global Reach Internet Connection Global Resource Information Database (remote sensing) 1. Gradient Index (ﬁber optics) 2. Graded Index (ﬁber optics) General Relationship Model 1. Generic Remote Switch Unit 2. Geographic Remote Switch Unit GPRS Roaming Exchange Group Separator Ground Start Trunk General Services Administration (U.S.A.) Global Standards Collaboration (ETSI) Global Software Deﬁned Network (AT&T) Generic Services Framework (software design) 1. Grand-Scale Integration (microchips) 2. Glide Slope Indicator Global System for Mobile Communications (Europe) GSM at 900 MHz GSM Standard for Railway Applications GSM Association General Switch Management Protocol (ATM) GSM Public Land Mobile Network 1. Gateway Switching Node 2. Gigabyte System Network 3. Global Subscriber Number Geostationary Orbit (satellite)

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G

136

&

GSO-FSS GSOC GSR GSS GSSA GSSAP GSTN GT GTA GTE GTI GTL GTLD GTLC GTLP GTMOSI GTN GTO

GTOC GTP

GTS GTSS GTT GUI GUID GUM GVF GVI GVNS

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Geostationary Satellite Orbit—Fixed Satellite Service German Space Operations Center Gigabit Switch Router Group Switch Selector Generic Security Service Application Generic Security Service Application Global-Switched Telephone Network (ITU-T) 1. Global Title 2. Gain Transfer 1. Government Telecommunications Association (U.S.A.) 2. Guam Telephone Authority 1. General Telephone and Electronics (company) 2. Group Translating Equipment Generic Trafﬁc Interface 1. Global Tele-Systems Ltd (India) 2. Gunning Transceiver Logic (CMOS circuits) Generic Top-Level Domain (Internet) Gunning Transceiver Logic Plus (CMOS circuits) Gunning Transceiver Logic Plus (electronics) General Teleprocessing Monitor for OSI Global Transaction Network (AT&T) 1. Geostationary Transfer Orbit 2. Gate Turn-Off 3. General Telecommunications Organization (Oman) General Telephone Operating Company 1. General Telemetry Processor 2. Generalized Trunk Protocol 3. GNOME Translation Project 4. Green Transport Plans 5. Government Telecommunications Program 1. Global Telecommunications System 2. Global TeleSystems (company) 3. Government Telecommunications System Global Telecom Solutions Sector (Motorola) Global Title Translation Graphical User Interface (computer) Global Unique Identiﬁcation (component object model) Grand Uniﬁed Multicast (IETF) Global VSAT Forum (England) Global Vegetation Index (remote sensing) Global Virtual Network Service

AU5866—CHAPTER G—G—12/7/2007—10:57—GANESHV—274409—XML MODEL E – pp. 129–137

Gg &

GVRP GVTel GW .gz Gzip

137

GARP VLAN Registration Protocol (VLANs) Garden Valley Telephone (company) 1. Gateway 2. Gigawatt (109 W) Name extension for ﬁles compressed with the UNIX gzip GNU zip (compression software)

G

AU5866—CHAPTER G—G—12/7/2007—10:57—GANESHV—274409—XML MODEL E – pp. 129–137

Hh H h H H PAD H-Channel H-MVIP H-pol H-sync Ha-Dec HA HAARP HAAT HACBSS HAD HAL HALE HALT HAM Radio

1. Symbol for hour 2. Symbol for hecto-, meaning one hundred or 102 3. Symbol for Planck’s constant (electronics) 1. Symbol for magnetic ﬁeld strength (electronics) 2. Symbol for Henry (unit of inductance) 3. Symbol for horizontal polarization Host Packet Assembler/Disassembler High-Speed Channel (ISDN) High-density MVIP Horizontal polarization Horizontal synchronization Hour angle–Declination angle Horn Alert of car (for mo bile ringing) High-frequency Active Auroral Research Program Height Above the Average Terrain (antenna) Homestead And Community Broadcasting Satellite Service Half Amplitude Duration 1. Hardware Abstraction Layer (operating system) 2. Hardwired Array Logic (digital electronics) High-Altitude Long Endurance Highly Accelerated Life Testing (satellite) Home Amateur Radio 139

AU5866—CHAPTER H—H—12/7/2007—10:56—GANESHV—274410—XML MODEL E – pp. 139–146

140

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

HAN HAPS HARM HASP HAVI HBA HBC HBFG HBS HBT HC HCA HCI HCIT HCL HCN HCO HCPLD HCS

HCSS HCT HD

HD-MAC HDB HDB3 HDBMS HDC HDCT HDD

Home Area Network High-Altitude Platform Systems (application) High-speed Anti-Radiation Missile Houston Automated Spooling Program (transmission protocol) Home Audio–Video Interoperability architecture Host Bus Adapter (computer) Half-band Bipolar Coding Host Behavior Functional Group (ATM) Home Base Station (wireless) Heterojunction Bipolar Transistor (electronics) High-speed CMOS (as in 74 HC245 IC numbers) Host Channel Adapter (ﬁber optics) 1. Host Command Interface 2. Human Computer Interface standards 3. High Council of Informatics (Iran) High Council of Information Technology (Iran) Hardware Compatibility List (Microsoft) 1. Hierarchical Computer Network 2. Hybrid Communications Network Hearing Carry Over (TRS) High-Capacity Programmable Logic Device (microchips) 1. Hundred Call Seconds 2. Hard Clad Silica (optical ﬁber) 3. Hierarchical Cell Structure (cellular networks) 4. High Council of Space (Iran) High-Capacity Storage System (data storing) 1. Hardware Compatibility Test (Microsoft) 2. High-speed CMOS with TTL thresholds (as in 74 HCT245 IC numbers) 1. Half Duplex (operation) 2. High-Deﬁnition (TV set) 3. Hard Disk 4. Hard Drive 5. High-Density High-Deﬁnition MAC (TV standard) High-Density Bipolar code High-Density Bipolar three zeros Substitution (data encoding) Hierarchical Data-Base Management System Hard Disk Controller (computer) Hybrid Discrete Cosine Transform Hard Disk Drive

AU5866—CHAPTER H—H—12/7/2007—10:56—GANESHV—274410—XML MODEL E – pp. 139–146

Hh

HDDR HDDT HDF HDFSS HDL HDLC HDML HDO HDPCM HDRSS HDSL HDSL2 HDT HDTMOS HDTP HDTV HDX HDWDM HE HEAO HEC HEHO HEL HEM HEM wave HEMP HEMT HeNe laser HEO HEOS HEP HEPA HEPIC HEPNet HER HERALD HERF HERO HERP

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141

High-Density Digital Recorder High-Density Digital Tape Hierarchical Data Format (computer) High-Density Fixed Satellite Service Hardware Description Language 1. High-level Data-Link Control (protocol) 2. Hardware Description Language C Handheld Devices Markup Language (programming) Hearing Destination Order (FCC) Hybrid Difference PCM (modulation) High-Data-Rate Storage System High-bit-rate DSL (access) High-bit-rate DSL version 2 (access) Host Digital Terminal (cable TV) High-Density Technique MOS (semiconductor) Handheld Device Transport Protocol (wireless) High-Deﬁnition Television (broadcasting) Half-Duplex (operation) Hyper Dense Wavelength-Division Multiplexing Head End (cable TV) High-Energy Astronomy Observatory 1. Header Error Check (ATM) 2. Hong Kong Electric Company Head-End Hop Off (trafﬁc) Hardware Emulation Layer (operating systems) Hughes Engineering Module Hybrid Electromagnetic wave High-altitude Electromagnetic Pulse High Electron-Mobility Transistor (semiconductors) Helium–Neon laser Highly Elliptical Orbit (satellites) Highly Eccentric Orbit Satellite High-Energy Physics High-Efﬁciency Particulate Arrester (ﬁlter) High-Energy Physics Information Center High-Energy Physics Network High-Efﬁciency Red (LEDs) Harbor Echo Ranging And Listening Device (sound detection) High-Energy Radio Frequency Hazards of Electromagnetic Radiation to Ordnance (military) Hazards of Electromagnetic Radiation to Personnel (military)

AU5866—CHAPTER H—H—12/7/2007—10:56—GANESHV—274410—XML MODEL E – pp. 139–146

H

142

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

HET Hex HEXFET HF HFAARS HFAI HFC HFCPN HFDF HFET HFS HFSCD HFSS HFU HG HGA Hi-Cap Hi-Fi Hi-Tech HI-OVIS Hi-res Hi8 Video HIC HIC HIF HiLAT HIO HIPAA HiperLAN HiPOT HiPPI HiRAN HIRS HITS HIVR

1. Hall-Effect Transducer (semiconductors) 2. Heterodyne Hexadecimal Hexagonal FET (semiconductors) 1. High Frequency (3–30 MHz range) 2. Hands Free (PBX and Wireless) High-Frequency Adaptive Antenna Receiving System Hands Free Answer on Intercom Hybrid-Fiber Coax (network architecture) High-Frequency Conditioned Power Network High-Frequency Distribution Frame Heterostructure FET (semiconductors) Hierarchical File System (computer) Hierarchical File System format for Compact Disk (networking) High-Frequency Structure Simulator Hands Free Unit Home Gateway (LANs) 1. Hercules Graphics Adapter (720!348 pixel monitors) 2. High-Gain Antenna High-Capacity system High-Fidelity system High-level Technology Highly Interactive Optical Visual Information System High-resolution system High-quality extension of the Video 8 format Hybrid Integrated Circuit (electronics) High-tech Industries Center (Iran) Host Interface node High-Latitude Satellite (U.S.A) Highly Inclined Orbit Health Insurance Portability and Accountability Act (U.S.A.) High-performance LAN High-Potential (testing) High-Performance Parallel Interface (ﬁber optic) High-precision SHORAN High-resolution Infrared Sounder (remote sensing) 1. High-Intensity Transient Signal 2. Hawaiian Inter-islands Telecommunications System 3. Hawaiian Information Transfer System Host Interactive Voice Response

AU5866—CHAPTER H—H—12/7/2007—10:56—GANESHV—274410—XML MODEL E – pp. 139–146

Hh

HJBT HJFET HKIX HKSW HLC HLD HLES HLF HLL HLLAPI HLP HLR HLS HLUT HMA HMD HMG HMI HMIC HMM HMMP HMS HNDS HNF HNPA HNS HO HO Tone HOBIC HOBIS HOC HOI HOL HOMC HomePNA HomeRF HOMO

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143

Hetero-Junction Bipolar Transistor (semiconductors) Hetero-Junction FET (semiconductors) Hong Kong Internet Exchange Hook Switch High-Level Committee (ITU) 1. High-Level Design 2. High-Level Dispatcher Home Land Earth Station (Inmarsat) High-Level Function High-Level Language High-Level Language Applications Programming Interface (IBM) High-Level Protocol Home-Location Register (cellular networks) 1. Hue—Lightness–Saturation (color model) 2. Hitless Switch Half Look-Up Table High-Memory Area (IBM PCs) Head-Mounted Display Hyper Master Group 1. Human-Machine Interface 2. Hub Management Interface (networking) Hybrid Microwave Integrated Circuit Hidden Markov Method (algorithm) Hypermedia Management Protocol (network management) 1. High-performance Management System 2. Hydrological and Meteorological Station Hybrid Network Design System High-performance Network Forum Home Numbering Plan Area Hughes Network Systems (company) Handover (GSM) Handoff Tone (cellular networks) Hotel Billing Information Center (AT&T) Hotel Billing Information System (AT&T) Highest Outgoing Channel Higher Order Interface High-Order Language (programming) Human-Oriented Media Computing Home Phone-line Networking Alliance (standards organization) Home Radio Frequency Home Ofﬁce Mobile Ofﬁce

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H

144

&

HOP HOPA HOPC HOPCM HOPS HOPSN HOPT HOR HOVC hp HP HPA HPAD HPBW HPC HPF HPFS HPGL HPIB HPIIS HPIL HPM HPO HPPI HPPM HPR HPT HQ HR HRC HRDP HRDS HRFWG HRP HRPT HRSC

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Higher Order Path Higher Order Path Adaptation Higher Order Path Connection High-Order PCM (modulation) Hardwire Order Processing System Higher Order Path Sub-Network Higher Order Path Termination Horizontal polarization High-Order Virtual Container (MUX) horsepower Hewlett-Packard (telecom company) 1. High-Power Ampliﬁer (microwave) 2. High-Performance Addressing (LCD displays) 3. Hi-vision Promotion Association (broadcasting) Host Packet Assembler/Disassembler Half-Power Beam-Width (antennas) Handheld Personal Computer High-Pass Filter High-Performance File System (OS/2) Hewlett-Packard Graphics Language (programming) Hewlett-Packard Interface Bus High-Performance International Internet Services Hewlett-Packard Interface Loop (as in HP41CX calculator) High-Power Microwave High-Performance Option High-Performance Parallel Interface High-Power Propulsion Module High-Performance Routing (LANs) 1. High-order Path Termination 2. Host Processing Time Headquarter 1. Half-Rate 2. Here (Morse code transmissions) 1. Hypothetical Reference Circuit 2. Hybrid Ring Control 3. High-Rupturing Capacity Hypothetical Reference Digital Path Hypothetical Reference Digital Section Home RF Working Group (US standards organization) Hypothetical Reference Path High-Resolution Picture Transmission High-Resolution Stereo Color (remote sensing)

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Hh

HRV HRVIR HRX HSA HSB HSC HSCH HSCI HSCS HSCSD HSD HSDA HSDL HSDPA HSDRAM HSDU HSF HSI HSL HSLN HSM HSN HSOP HSPD HSPSD HSR HSRP HSSI HSSP HST HSTL HSTP HSTR HSV hSymbols/s HSYNC

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High-Resolution Visible (remote sensing) High-Resolution Visible and Middle Infrared (remote sensing) Hypothetical Reference Connection (ISDN) High-Speed Access 1. Hue–Saturation–Brightness (color model) 2. Hot Standby 1. Hierarchical Storage Controller 2. High-Speed Channel High-Speed Channel High-Speed Communications Interface (Cisco) High-Speed Circuit-Switched High-Speed Circuit-Switched Data (wireless) 1. High-Speed Data (Inmarsat) 2. Home Satellite Dish High-Speed Data Access High-speed Subscriber Data Line (Telcordia Technologies) High-Speed Downlink Packet Access High-speed Synchronized Dynamic RAM (memory) High-Speed Data Unit Heat-Sink Fan (electronics) Hue–Saturation–Intensity (color model) Hue–Saturation–Luminance (color model) High-Speed Local Network 1. Hierarchical Storage Management (ﬁle storage) 2. Hardware-Speciﬁc Module (networking) 1. Hopping Sequence Number (GSM) 2. Hierarchically Synchronized Network (networking) High-power Small-Outline Package (microchips) High-Speed Packet Data High-Speed Packet-Switched Data (wireless) Harmonic Suppression Reactor Hot Standby Routing Protocol (routing) High-Speed Serial Interface (Cisco) High-Speed Switched Port High-Speed Technology 1. High-Speed Transceiver Logic (digital electronics) 2. High-Speed Transistor Logic (digital electronics) High-Speed Transport Protocol High-Speed Token-Ring Hue–Saturation—Value (color model) hecto (100) Symbols per seconds (TV) Horizontal Sync (video signals)

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H

146

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

HT HTC HTCC HTCP HTG HTL .htm .html HTML HTMLC HTR HTRB HTS HTTL HTTP HTTP-NG HTTPD HTTPS HTU-C HTU-R HUD HUT HV HVAC HVDC HVP HVPS HVQ HWCS HyCoS HYTELNet Hz

1. “Horizontal Tabulation” (character control code) 2. High Tension High-Tech Computer High-Temperature Co-ﬁber Ceramic Hyper Text Catching Protocol Hunt Group High-Threshold Logic (digital electronics) The MS-DOS/Windows 3.x name extension for HTML ﬁles Name extension for HTML ﬁles Hyper Text Markup Language (programming) HTML Plus (programming) Hard-To-Reach High-Temperature Reverse Bias High- Temperature Superconductor High-power Transistor-to-Transistor Logic (digital electronics) Hyper Text Transfer Protocol (World Wide Web) Hyper Text Transfer Protocol Next Generation Hyper Text Transfer Protocol Daemon HTTP-Secure Connection HDSL Terminal Unit—Central (HDSL modem or line card) HDSL Terminal Unit—Remote (HDSL modem or PC card) Head-Up Display (combat aircraft) 1. High-Usage Trunk 2. Hopkins Ultraviolet Telescope 1. High Voltage 2. Have (Morse code transmissions) 1. Heating, Ventilating, and Air Conditioning system 2. High-Voltage AC High-Voltage Direct Current (power) Hub Voice Port High-Voltage Power Supply Hierarchical Vector Quantization (video compression) Harmony Wireless Communications System (Motorola) Hypermedia Communication Server Hypertext-browser for TELNet Accessible sites Hertz (unit of frequency)

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Ii I

I Package I&C I&M I&R I-4s I-beam I-CASE I-CF I-CFDA I-CFDAIO I-CFIB I-CFIBIO I-CFIG I-CFIO I-CFPF I-CFV I-CFVCG

1. Symbol for electrical current (electronics) 2. Symbol for Intensity (electronics) 3. Symbol for “On” position of rocker switches (electronics) Installation Package Installation and Checkout Installation and Maintenance Installation and Repair (telephone company department) Fourth Generation of Inmarsat Satellites (Inmarsat) Name of cursor when resembles the capital letter I (computer) Integrated Computer-Aided Software Engineering ISDN Call Forwarding ISDN Call Forwarding Don’t Answer ISDN Call Forwarding Don’t Answer Incoming Only ISDN Call Forwarding Interface Busy ISDN Call Forwarding Interface Busy Incoming Only ISDN Call Forwarding Intra-Group ISDN Call Forwarding Incoming Only ISDN Call Forwarding over Private Facilities ISDN Call Forwarding Variable ISDN Call Forwarding Variable facilities for Customer Group 147

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

I-CNIS I-Commerce I-EDI I-ETS I-frame I-HC i-LINK i-Mode I-MUX I-Order I-picture I-PNNI i-Pod I-time I-TV I-Way I/F I/O I/P I/R I2 I2C I2ICE I2L I2O I2S2C2 I2T i386SL i486DX i486SL i486SX IA

IA-32 IA-64 IA2 IA5

ISDN Calling Number Information Service Internet Commerce Internet-based Electronic Data Interchange Interim European Telecommunications Standard Intra-coded frame (MPEG animation) ISDN Hold Capability Another name for FireWire Technology Internet-Mode (GSM service) Inverse Multiplexer Installation Order Intra-coded picture (MPEG animation) Integrated PNNI (ATM) Internet Pod (Apple) Instruction time Interactive Television Information Superhighway Interface 1. Input/Output (electronics) 2. In-route/Out-route Input Installation and Repair Internet 2 Inter-Integrated Circuit Integrated Instrumentation and In-Circuit Emulation (electronics) Integrated-Injection Logic (digital electronics) Intelligent Input/Output (standard) International Information Systems Security Certiﬁcation Consortium Intelligent Interface Technology A version of Intel’s 386 family of microprocessors An advanced version of Intel’s 80386 microprocessor A low-power consumption version of Intel’s 80 486DX A low-cost alternative to the Intel’s 80 486DX 1. International telegraph Alphabet 2. Internet Appliance 3. Instrumentation Ampliﬁer (electronics) 4. Implementation Agreement 5. Intelligent Agent 6. Intel Architecture Intel Architecture 32 bit Intel Architecture 64 bit International telegraph Alphabet No. 2 International telegraph Alphabet No. 5

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Ii

IAAB IAB IAC

IADs IADP IAEA IAEEE IAF IAGA IAGC IAHC IAI IAL IAM IAMSAR IANA IAO IAP IAP1 IAP2 IAPP IARL IARU IASA IASG IAT IATA IATE

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Inter-American Association of Broadcasting 1. Internet Architecture Board (DARPA) 2. Internet Activities Board 1. Information Access Company 2. Information Analysis Center (U.S. defense department) 3. Interactive Synchronous Communications 4. Inter-Application Communications (protocol) 5. Internet Access Coalition (organization) 6. Institute for Advanced Commerce (IBM) 7. Industry Advisory Council Integrated Access Devices (Internet) International Assistance & Development Program (Intelsat) International Atomic Energy Agency Iranian Association of Electrical & Electronics Engineers International Astronautical Federation International Association of Geomagnetism and Aeronomy Instantaneous Automatic Gain Control (Intelsat) International Ad Hoc Committee Initial Address Information Intel Architecture Labs (Intel) 1. Initial Access Message (SS7) 2. Incoming Address Message (SS7) 3. Intermediate Access Memory International Aeronautical and Maritime Search And Rescue (IMO) Internet Assigned Numbers Authority (organization) Intra-Ofﬁce SONET signal 1. Internet Access Provider 2. Intelligent Access Point Initial Acquisition Phase 1 code Initial Acquisition Phase 2 code Inter-Access Point Protocol International Amateur Radio League International Amateur Radio Union Integrated AUTODIN System Architecture Internetwork Address Sub-Group 1. Intermediate Attitude Trim 2. International Atomic Time International Air Transport Association International Accounting and Trafﬁc Analysis Equipment

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

IAU IB IBA IBC

IBCN IBDN IBG IBI IBIC IBL IBM IBM AT IBM PC IBM-ERS IBN IBND IBNPR IBO IBOC IBPD IBS IBT IBW IBX IC

IC DRAM ICA

1. Initial Acquisition Unit 2. International Astronomical Unit Input Buffer Independent Broadcasting Authority 1. International Broadcasting Convention 2. Information Bearer Channel 3. Integrated Broadband Communications 4. Interface Buffer Controller 5. Internal Bus Controller 6. Initial Billing Company Integrated Broadband Communications Network Integrated Building Distribution Network (ﬁber optics) Inter-Block Gap (storage disks or tapes) 1. Inter-Burst Interference 2. Intergovernmental Bureau for Informatics 3. International Broadcast Institute Interface Bus Interactive Control Initial Binary Load International Business Machines Corporation IBM’s personal computer Advanced Technology IBM Personal Computers IBM Emergency Response Service Institut Belge de Normalisation (Belgium) Interim Billed Number Database In-Band Noise Power Ratio Input Back-Off In-Band On-Channel (broadcasting) In-Band Power Difference 1. Intelsat Business Service 2. Intelligent Battery System 3. International Broadcasting Station 1. Internet-Based Training (e-learning) 2. Isochronous Burst Transmission (data network) Instantaneous Band-Width Integrated Business Exchange (same as PBX) 1. Integrated Circuit (electronics) 2. International Channel 3. Intercom 4. Interexchange Carrier 5. Intermediate Cross-connect Integrated Circuit DRAM (memory) 1. International Communications Association (U.S. standards) 2. Integrated Communications Adapter (ﬁber optics)

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Ii

iCal Ical ICAL iCalendar ICALEP ICAM ICANN ICAO ICAP ICAPI ICASA ICB ICC ICCAPI ICCB ICCC ICCF ICCID ICD ICDL ICE ICE Age ICEA ICFA ICI

ICIA ICII ICIT Icky PIC ICM

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151

Internet Calendaring and scheduling (Apple Inc.) An X-based calendaring and scheduling program Internet Community At Large Internet Calendaring and scheduling (Apple Inc.) International Conference on Accelerator and Large Experimental Physics Integrated Conditional Access Module Internet Corporation for Assigned Names and Numbers International Civil Aviation Organization Intellectual Capital International Call API Independent Communications Authority of South Africa Individual Case Basis (service) International Calling Card (service) International Call Control API Internet Conﬁguration Control Board Internet Channel Commerce Connectivity protocol 1. Interexchange Carriers Compatibility Forum 2. International Civic Communication Forum (Ukraine) 3. International Correspondence Chess Federation Integrated Circuit Card ID 1. International Code Designator 2. Interface Control Document 3. Interconnect Diagram International Computer Driving License 1. In-Circuit Emulator (electronics) 2. Information Content and Exchange (protocol) 3. Information Communications and Entertainment Information Communication and Entertainment Age Insulated Cable Engineers Associations, Inc. (U.S.A.) International Computer Facsimile Association 1. Inter-Channel Interference 2. Inter-Carrier Interface 3. Interface Control Information (ISO) 4. Incoming Call Identiﬁcation 5. International Commission on Illumination Information and Communications Industry Association, Ltd Iranian Communication Industries Incorporation International Center for Information Technology (MCI) Sticky Plastic Insulated Conductor 1. Integrated Call Management 2. Image Color Matching (scanning)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

ICMP ICMPv6 ICN ICNI ICNIRP ICO ICOMP ICONET ICONTEC ICP

ICQ ICR ICS

ICSA ICSC ICSTD ICT ICTA

ICTC ICTSB ICTUS ICV ICW

Internet Control Message Protocol (IETF) Internet Control Message Protocol version 6 Idle-Channel Noise Integrated Communications, Navigation, and Identiﬁcation International Commission of Non-Ionizing Radiation Protection Intermediate Circular Orbit (satellite) Intel Comparative Microprocessor Performance index (TEST) Satellite Communication Network of ICO Global Communications Instituto Colombiano de Normas Te´cnicas 1. Internet Connection Provider 2. Internet Cache Protocol 3. Integrated Communications Provider 4. Integrated Communications Platform 5. Independent Communications Provider 6. Intelligent Call Processor/Processing (AT&T service) “I Seek You” (instant messaging client) 1. Initial Cell Rate (ATM) 2. Internet Call Routing node (Telcordia Technologies) 3. In-Circuit Reconﬁguration 1. Interactive Call Setup 2. Integrated Communications System (Northern Telecom) 3. Internet Connection Sharing International Computer Security Association (U.S.A.) 1. Interexchange Customer Service Center 2. Infrared Communication Systems Study Committee Information, Communication, and Space Technology Division (UN) Information & Communications Technology 1. International Computer-Telephony Association 2. International Center for Technology Assessment 3. International Commission on Technology and Accessibility 4. Independent Cable & Telecommunications Association Information and Communications Technology Center ICT Standards Board (ETSI) ICT Uniﬁed Submissions Integrity Check Value Interrupted Continuous Wave (modulation)

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ID

IDA IDAB IDAL IDAPI IDC

IDCMA IDCS IDCSP IDD IDDD IDDS IDE

IDEA IDECM IDEF IDEN IDev IDF IDFT IDI IDL IDL IDLC IDM IDML

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153

1. Identiﬁcation 2. Identiﬁer 3. Identiﬁcation Digit(s) 4. Input Device 5. Intermediate Device 6. Integrated Dispatch 1. Integrated Data Access 2. Integrated Digital Access 3. Interchange of Data between Administrations Improved Digital Audio Broadcast (technology) International Dedicated Access Line Integrated Database Application Programming Interface 1. Internet Data Center 2. Intermediate-rate Digital Carrier 3. International Data Corporation (company) 4. Insulation Displacement Connector (DSL) Independent Data Communications Manufacturers Association Integrated Digital Communications System Initial Defense Communications Satellite Program International Direct Dial (code) International Direct Distance Dialing (feature) Installable Device Driver Server 1. Integrated Device Electronics (computer interface) 2. Intelligent Derive Electronics (disk) 3.Integrated Development Environment (Windows program) International Data Encryption Algorithm Integrated Defense Electronic Countermeasure (military) Intrusion Detection Exchange Format Integrated Digital Enhanced Network (wireless) Input Device Intermediate Distribution Frame Inverse Discrete Fourier Transform (algorithm) Initial Domain Identiﬁer (ATM) Interconnect Description Language 1. Interactive Distance Learning (e-learning) 2. Interface Design Language (programming) Integrated Digital Loop Carrier Isochronous Demodulation International Development Markup Language (programming)

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IDN

IDNX IDP IDR IDRP IDS IDSCP IDSL IDSS IDSU IDT

IDTS IDTV IDU IE IEC

IECEJ IEE IEEE IEI IEN IEPG IES

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Integrated Digital Network 2. Information Digit Node (Sprint) 3. International Domain Name (Internet) 4. Identiﬁcation Number 1. International Digital Network Exchange 2. Integrated Digital Network Exchange 1. Integrated Data Processing 2. Internetworking Datagram Protocol (Internet) 1. Intermediate Data Rate (Intelsat) 2. Isochronous Distortion Ratio (transmission) Inter-Domain Routing Protocol (Novell NetWare) 1. Intrusion Detection System 2. Internal Data Services 3. Current of Drain-to-Source (electronics) Initial Defense Communication Satellite Program ISDN DSL (access) Saturated current of Drain-to-Source (electronics) Intelligent Data Service Unit 1. Inter-machine Digital Trunk 2. Inter-DXC Trunk 3. Interactive Data Transaction 4. Integrated Digital Terminal Integrated Data Test System (software program) Improved-Deﬁnition Television (broadcasting) 1. In-Door Unit (VSAT) 2. Interface Data Unit 3. Indefeasible Right of Use (optical ﬁber) 1. Information Engineering 2. Internet Explorer (software) 1. Inter-Exchange Carrier (see IXC) 2. Internet Exchange Center 3. International Electrotechnical Commission (Geneva) 4. International Engineering Consortium (U.S.A.) Institute of Electronic and Communication Engineers of Japan Institute of Electrical Engineers (U.K.) Institute of Electrical and Electronic Engineers, Inc. (standards) Iran Electronic Industries Internet Experimental Note 1. Internet Engineering and Planning Group (ISPs) 2. Intelligent Electronic Program Guide 1. Information Exchange Service 2. Illuminating Engineering Society

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Ii

IESNA IESG IESS IETF IF IFAC IFax IFB IFC IFCC IFCM IFD IFE IFEA .iff IFF IFFM IFFT IFG IFIP IFL IFM IFMP IFOC IFOV IFP IFR IFRB IFS IFSK IFSS IFTS IFWP IG IGA

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155

3. Inter-Enterprise Systems Illuminating Engineering Society of North America Internet Engineering Steering Group (Internet society) Intelsat Earth Station Standard Internet Engineering Task Force (IAB subcommittee) Intermediate Frequency International Federation of Automation Control Internet-interfaced Facsimile device Indirect Feedback Information From Controller Internet Fraud Compliant Center Independent Flow Control Message Image File Directory In-Flight Entertainment system Internet Free Expression Alliance (organization) Name extension for ﬁles having IFF format (computer) 1. Interchange File Format 2. Identiﬁcation, Friend, or Foe (aircraft detection equipment) Incoming First Fail to Match (telephone company) Inverse Fast Fourier Transform (algorithm) Inter-Frame Gap (frame relay) International Federation for Information Processing 1. Inter-Facility Link (ﬁber optics) 2. International Frequency Library 1. Intermediate Frequency Module 2. Instantaneous Frequency Measurement Ipsilon Flow Management Protocol (IETF) Integrated Fiber Optic Circuit Instantaneous Field Of View (remote sensing) Internet Fax Protocol Instrument Flight Rules (aviation) International Frequency Registration Board (ITU-R) 1. International Freephone Service (ITU-T) 2. Installable File System Manager 3. Ionospheric Forward Scatter (propagation) Incoherent FSK (modulation) Intermediate Frequency Sub-System International Toll Free Service International Forum on the White Paper 1. Isolated Ground 2. International Gateway 3. Insertion Gain (transmission) Intermediate-Gain Antenna

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IGBT IGC IGES IGFET IGMP IGO IGP IGRP IGT IGW IGY IHF IHL IHO IHP IIA IICA IICCA IIH III IIIA IIL IILC IIN IIOP IIR IIS IISP IITF IIW IJCAI IJT IKBS IKE

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Insulated-Gate Bipolar Transistor (semiconductors) Intelligent Graphics Controller Initial Graphics Exchange Speciﬁcation (ﬁle format) Insulated-Gate FET (semiconductors) Internet Group Management Protocol (networking) Inter-Governmental Organization 1. Interior Gateway Protocol (Cisco) 2. Integrated Graphics Processor Interior Gateway Routing Protocol (Cisco) Ispettorato Generale della Telcomunicazioni (Italy) International Gateway Switch International Geophysical Year 1. Institute of High Fidelity 2. Inherited-Halt Flip-ﬂop Internet Header Link International Hydrographic Organization Internal High-order path Protection 1. Information Industry Association (U.S.A.) 2. Irish Internet Association 3. Iran Informatics Association International Intellectual Capital Codes Association International Intellectual Capital Codes Association Is-IS Hellow (routing protocol) Information Industry Index 1. Integrated Internet Information Architecture 2. Internet Information Infrastructure Architecture 3. International Internet Industrial Association Integrated-Injection Logic (digital electronics) Information Industry Liaison Committee Issuer Identiﬁcation Number Internet Inter-ORB Protocol 1. Interactive Information Response 2. Inﬁnite Impulse Response (ﬁlter) 3. Interactive Information Response Internet Information Server (Windows NT) 1. Information Infrastructure Standards Panel (ANSI) 2. Interim Interface Signaling Protocol 3. Interim Interswitch Signaling Protocol Information Infrastructure Task Force ISDN Implementers Workshop International Joint Conference on Artiﬁcial Intelligence Intrinsic-Junction Transistor (semiconductors) Intelligent Knowledge-Based System (ICT) Internet Key Exchange (IPsec)

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Ii

IKP IL ILA ILAN ILAS ILCR ILD ILEC ILF ILLED ILLP ILMI ILNP ILO ILOVEYOU ILP ILS

ILSR ILT

IM

IMA IMAC IMAG IMAP IMAP4

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157

Internet Keyed-payments Protocol 1. Insertion Loss (transmission) 2. Intermediate Language (programming) 1. Intermediate Light Ampliﬁcation 2. Injection-Locked Ampliﬁer 1. Interactive LAN (protocol) 2. Inline Ampliﬁer Node Improved Limb Atmospheric Sounder (remote sensing) International Least Cost Route Injection Laser Diode Incumbent Local Exchange Carrier Infra low Frequency (300–3000 Hz) Integral Lens Light-Emitting Diode Inter Link-to-Link Protocol Interim Link Management Interface (ATM) Interim Line Number Portability Injection-Locked Oscillator “I LOVE YOU” (VBScript worm) Internal Low-order path Protection 1. International Launch Service (satellite company in U.S.A.) 2. Instrument Landing System (avionics) 3. Input-buffer Limiting Scheme 4. Integrated Learning System (e-learning) 5. Internet Locator Service IPX Link State Router (networking) 1. Idle Line Termination 2. Instructor-Led Training (e-learning) 3. Institute for Learning and Teaching in Higher Education (U.K.) 1. Intermodulation 2. Intensity Modulation 3. Isochronous Modulation 4. Information Model 5. Instant Messaging 1. Interactive Multimedia Association (Malaysia) 2. Integrated Modular Avionics 3. Inverse Multiplexing for ATM Isochronous Media Access Control (FDDI Architecture) Induction Magnetometer Internet Messaging Access Protocol Internet Messaging Access Protocol 4

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

IMAS IMASS IMAX IMC IMD IMDN IME IMEI IMEISV IMFET IMG IMN IMO IMCC IML IMP IMPATT IMPDU IMPS IMR IMS IMS/VS IMSI IMSO IMT IMT-2000 IMTA IMTC IMTS IMUIMG IMUX IMW in

Intelligent Maintenance Administration System (software) Intelligent Multiple Access Spectrum Sharing “I”—eye Maximum (cinematic system) 1. Internet Mail Consortium (U.S.A.) 2. Interagency Management Council 3. Instrument Meteorological Condition (avionics) Intermodulation Distortion Intelligent Mobile Data Network Internally Mounted Equipment International Mobile-station Equipment Identiﬁer (GSM) IMEI plus a Software Version (GSM) Internally Matched FET (semiconductors) Interferometric Monitor for Greenhouse Gases (remote sensing) Inmarsat Mobile Number International Maritime Organization ISDN Management Coordinating Committee Incoming Mail Loss (telephone company) 1. Interface Message Processor (ARPANet) 2. Intermodulation Products Impact Avalanche Transit Time (semiconductors) Initial MAC Protocol Data Unit Inﬁnite Monkey Protocol Suite Intermodulation Ratio 1. IP Multimedia Subsystem 2. Information Management System (ICT) Information Management System/Virtual System International Mobile Subscriber Identity (GSM) International Mobile Satellite Organization 1. International Mobile Telecommunications 2. Inter-Machine Trunk International Mobile Telecommunications-2000 International Mobile Telecommunications Association International Multimedia Teleconferencing Consortium (U.S.A.) 1. Improved Mobile Telephone System 2. International Mobile Telecommunications System ISDN Memorandum of Understanding Implementation Management Group Inverse Multiplexer Intelligent Music Workstation inch

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in/s in2 IN INA INAP InAs INAT Inbox INC INCC INCM IND-E IND-W INDIGO INDIX INE INet INET info Infobahn INFOSEC InGaAs INGECEP INH .ini INIC INIM INIRC INL INMAC Inmarsat INMC INMLM INMS

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159

inch per second square inch Intelligent Network 1. Information Network Architecture (Telcordia Technologies) 2. Interactive Network Adapter (broadcasting) 1. Intelligent Network Access Protocol (INs) 2. Intelligent Network Application Part (INs) Indium–Arsenide (semiconductors) Intermode Alarm Transport Incoming mails box (e-mail) International Carrier Internal Network Control Center Intelligent Networks Call Model Indian Ocean Region East (Inmarsat) Indian Ocean Region West (Inmarsat) Integrated Digital Overlay International Network for Development Information Exchange Intelligent Network Element Institutional Network short form of Internet information ﬁeld (LANs) Information autobahn (superhighway) Information Security system Indium–Gallium–Arsenide (semiconductors) Integrated Next Generation Electronic Commerce Environmental Project Inhibiter (microchips) Name extension for Initialization ﬁles (computer) ISDN Network Identiﬁcation Code ISDN Network Interface Module International Non-Ionizing Radiation Committee 1. Internode Link 2. Integral Non-Linearity International Network Management Center International maritime satellite (organization) Now it is called “International mobile satellite Company” International Network Management Center Integrated Network Manager Link Module 1. Inmarsat Monitoring System 2. Integrated Network Management Services

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

INN INNO INNS INode INOS InP INP INPA INPE INPS INs INS

INSAT INSP INSS int INT INTAIP INTEGRAL Intelsat intercom InterLATA Internaut internet Internet Internet2 InterNIC InterPBX INTERSPUTNIK INTFC

1. Internode Network 2. Internet News International Neural Network Operator International Neural Network Society (Berkeley University, U.S.A.) Integrated Node Intelligent Network Operating System Indium–Phosphide (semiconductors) 1. Intelligent Network Processor 2. International Network Planning 3. Interim Number Portability Interchangeable Network Planning Area 1. Instituto Nacional de Pesquisas Espaciais (Brazil) 2. Brazilian Space Agency Intelligent Network Product Support Intelligent Networks 1. Information Network System 2. Ion Neutralization Spectroscopy (electronics) 3. Inertial Navigation System 4. Integrated Network System 5. Internet Naming Service Indian National Satellite IN Service Provider IN Service Subscriber internal Induction Neutralizing Transformer Interoperability Technology Association for Information Processing International Gamma Ray Astrophysics Laboratory International Telecommunication Satellite (organization) intercommunication system Telecommunication services that originate in one LATA and terminate in another Internet astronaut interconnection of two or more data networks International Network The second Generation Internet Internet Network Information Center (U.S.A.) The calls coming to a PBX International Organization of Space Communications (Russia) Interface

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IntraLATA INTS IntServ INTUG INV InWATS I/O IO IOA IOC

IOCTF IOD IOEF IOF IOL ION IONL IOP IOPS IOR IOS

IOSA IOST IOT IOTP IOU IOV

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161

Telecommunication services that originate and terminate in the same as LATA International Transit Switch Integrated Services International Telecommunications User Group inverter Inward Wide-Area Telephone Services Input/Output Information Outlet Interim Operating Authority (cellular networks) 1. In-route/Out-route Controller (electronics) 2. Input/Output Controller 3. Integrated Optical Circuit (electronics) 4. Intelsat Operations Center 5. Intermediate Orbit Communications 6. Independent Operating Carrier 7. Inter-Ofﬁce Channel 8. ISDN Ordering Code Intelsat Operations Center TDMA Facility Identiﬁed Outward Dialing (PBX) Instantaneous Override Energy Function (AT&T) Inter-Ofﬁce Facility Inter-Operability Lab (New Hampshire University) 1. Internetworking Over NBMA 2. Intelligent Optical Network Internal Organization of the Network Layer (OSI model) 1. Input/Output Processor 2. interoperability Internet Operators Group 1. Indian Ocean Region (Inmarsat) 2. Index Of Refraction (ﬁber optics) 1. Internetwork Operating System (Cisco) 2. Inter-Ofﬁce Section 3. Indian Ocean Satellite (Intelsat) 4. International Organization for Standardization (Switzerland) Inter-Ofﬁce Section Adaptation Inter-Ofﬁce Section Termination 1. In-Orbit Testing (satellites) 2. Inter-Operators Tariffs (GSM) 3. InterOperability Testing Internet Open Trading Protocol Input/Output Unit In-Orbit Veriﬁcation (space researches)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

IP

IP PBX IPA IPARS IPBO IPC

IPCC IPCE IPCH IPCI IPComp IPconﬁg IPCP IPDC IPDR IPDRs IPDS IPDU IPE IPEI IPENZ IPL IPLC ipm IPM

1. Internet Protocol (TCP/IP) 2. Information Provider (Internet) 3. Interface Processor (electronics) 4. Intelligent Peripheral (device) 5. Ingress Protection (hardware box standard) 6. Intercom Proﬁle (Bluetooth) Internet Protocol PBX 1. Intermediate Power Ampliﬁer 2. Intellectual Property Attorney International Passenger Airline Reservation System (IBM) Input Power Back-Off 1. Inter-Process Communication (networking) 2. Inter-Personal Communications 3. Information Processing Center 4. ISDN to POTS Converter Internet Protocol Contact Center Inter-Process Communication Environment Initial Paging Channel (GSM) Integrated Personal Computer Interface IP Payload Compression Protocol Internet Protocol conﬁguration (utility program) Internet Protocol Control Protocol Internet Protocol Device Control Internet Protocol Data Record IP Detail Records 1. Inmarsat Packet Data Service 2. Intelligent Printer Data Stream (IBM) Internet Protocol Data Unit 1. Intelligent Peripheral Equipment (Northern Telecom) 2. Initial Pointing Error International Portable Equipment Identities (wireless) Institute of Professional Engineers of New Zealand Initial Program Load (of operating systems) International Private Line Circuits 1. impulses per minute 2. interruptions per minute 1. Inter-Personal Messaging system (X.400) 2. Interference Prediction Model (propagation) 3. Incremental Phase Modulation 4. Internal Polarization Modulation

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Ii

IPMC IPMS IPN IPNC IPND IPNG IPNGWG IPNS IPO IPoATM IPoD IPONZ IPoS IPP IPPV IPR IPRA IPRS IPS IPS7 IPSec IPSN IPSO IPSS IPT IPT Gateway IPTC IPTV IPU IPv4 IPv5 IPv6 IPX IPXCP IPXODI IPX/SPX IPXWAN I/Q IQF

&

Industrial Process Measurement and Control Inter-Personal Messaging Service Impulse Noise IP Network Controller Integrated Public Number Database Internet Protocol Next Generation IP Next Generation Working Group ISDN PBX Networking Speciﬁcation 1. Initial Public Offering (ﬁnance) 2. Input-Process-Output Internet Protocol over ATM Internet Protocol phone over Data Intellectual Property Ofﬁce of New Zealand IP over SONET (IETF) Internet Printing Protocol Impulse Pay Per View (broadcasting) Intellectual Property Right Internet Policy Registration Authority Internet Protocol Routing Service (Bell) 1. Internet Protocol Suite 2. Integrated Power Systems Internet Protocol Signaling 7 IP Security policy (VPNs) International Public-Switched Network IP Security Option International Packet-Switched System IP Telephony IP Telephony Gateway IP Telephony solution for Carriers (Ericsson) Internet Protocol TV (Cisco) Intelligent Processing Unit Internet Protocol version 4 Internet Protocol version 5 Internet Protocol version 6 Internetwork Packet Exchange (networking) IPX Control Protocol (networking) Internetwork Packet Exchange Open Data-link Interface Internet Packet Exchange Sequenced Packet Exchange IPX Wide-Area Network (Novell speciﬁcation) In-phase/Quadrature Intrinsic Quality Factor (transmission)

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163

I

164

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

IR

IRA IRAC

IRAM IRAMS iraser IRC

IrCOMM IRCN IRD IrDA IRDB irdome IRE IRED IREQ IRF IRFBP IRFU IRG IRGB IRIB IRICA IRIG iRIP IRL IrLAP

1. In-Route 2. Infrared 3. Internet Registry 4. Information Retrieval 1. Internet Resource Access 2. Impulse Radiating Antenna 1. International Radiocommunications Advisory Committee 2. Interagency Radio Advisory Committee 3. Interdepartmental Radio Advisory Council (U.S.A.) 4. Internal Review and Audit Compliance 5. Infrared Array Camera Intelligent RAM (memory) Innovative Real-time Antenna Modeling System infrared maser 1. Internet-Relay Chat (ICT) 2. Integrated Receiver decoder 3. International Record Carrier 4. Interference Rejection Combining (cellular networks) Provides COM (serial or parallel) port emulation or connections using IrDA protocol Inter-Regional Control Node 1. Integrated Receiver/Descrambler 2. Integrated Receiver/Decoder (DSB) 3. Internal Resources Database Infrared Data Association (standards organization) Intelligent Roaming Data-Base (cellular networks) infrared dome Institute of Radio Engineers Infrared-Emitting Diode (electronics) Interrupt Request (signal) 1. Industrial Radio Frequency 2. Impulse Response Function 3. Inherited Rights Filter (networking) Inmarsat Request For Business Plan Integrated Radio Frequency Unit Inter-Record Gap (storage disks or tapes) Intensity Red Green Blue (monitors color encoding) Islamic Republic of Iran Broadcasting Iran Informatics Companies Association Inter-Range Instrumentation Group iCalendar Real-time Interoperability Protocol Inter-Repeater Link (networking) Infrared Link Access Protocol (IrDA Network)

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Ii

IrLMP IRM IrMC IROB IRP IRQ IRR IRS IRSC IRSG IRSU IRTF IRTU IRU IS

IS-2000 IS-41 IS-410 IS-41A IS-95 IS-IS ISA

ISACA ISAKMP ISAM ISAP ISAPI

&

165

Infrared Link Management Protocol (IrDA Network) Image Rejection Mixer Infrared Mobile Communications In Range Of Building I/O Request Packet Interrupt Requests (computer) 1. Internet Routing Registry 2. Image Rejection Ratio (heterodyning) 1. Inertial Reference System 2. Indian Remote Sensing System Iranian Remote Sensing Center Internet Research Steering Group ISDN Remote Subscriber Unit Internet Research Task Force (IAB subcommittee) Integrated Remote Test Unit Indefeasible Right of Use or User (undersea ﬁber cable) 1. Information Services (ICT) 2. Information Systems (ICT) 3. Information Superhighway 4. Information Separator (control character) 5. Interactive Services 6. Interim Standard 7. Internal Shield (tube-base diagrams) Interim Standard 2000 (cellular network) Interim Standard 41 (cellular network) Interim Standard 41 Zero (cellular network) Interim Standard 41A (cellular network) Interim Standard 95 or CDMAone (cellular network) 1. Intermediate System to Intermediate System (routing protocol) 2. Intelligent Scheduling and Information System 1. Iranian Space Agency (Iran) 2. Industry Standard Architecture (old computers) 3. Interactive Service Association 4. Instrumentation, Systems, and Automation society 5. Instrumentation Society of America Information Systems Auditability and Control Association Internet Security Association and Key Management Protocol Indexed Sequential-Access Method (databases) Istanbul Action Plan (ITU) Internet Server Application Programming Interface (Microsoft)

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I

166

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

ISAR ISAS ISB ISBN ISC ISCA ISCCP ISCSI ISCP ISD ISDB ISDE ISDL ISDN ISDN2 ISDN2e ISDN30 ISE ISEC ISG ISHM ISI ISIA ISIS ISL

ISLU ISM ISM Band ISMC

Inverse Synthetic-Aperture Radar Institute of Space and Astronautical Science ( Japan) 1. Inter-Shelf Bus 2. Independent Side-Band (modulation) Integrated Satellite Business Network 1. International Switching Center 2. Internet Software Consortium International Speech Communication Association International Satellite Clouds Climatologic Project (remote sensing) Internet Small Computer Systems Interface Integrated Services Control Point (Telcordia Technologies) 1. Incremental Service Delivery 2. Information Systems Department 3. Internet Standards Document Integrated Services Digital Broadcasting Integrated Services Digital Exchange Integrated Services Digital Line Integrated Services Digital Network (transmission) ISDN with two BRI channels and one D channel European ISDN with two BRI channels and one D channel ISDN service delivering 30 BRI lines over one line Integrated Switching Element Information Security Exploratory Committee Incoming Service Group International Society of Hybrid Microelectronics 1. Information Sciences Institute 2. Inter-Symbol Interference (transmission) 3. Informatics Society of Iran Information and Software Industry Association 1. Internal Switch Interface System (packet service) 2. Intelligent Scheduling and Information System 1. Inter-station Signaling Link (Inmarsat) 2. Inter-Satellite Link (Intelsat) 3. Inter- Switch Link (Cisco Ethernet) 4. ISDN Signaling Link (Northern Telecom) Integrated Services Line Unit (AT&T) Inter-Stellar Medium Industrial, Scientiﬁc and Medical frequency Band International Switching Management Center International Society for Measurement and Control

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Ii

ISMN ISMS ISN

ISNAP ISNET ISNI ISO ISOC ISoD ISODE IsoENET ISO/OSI model ISP

ISPBX ISPC ISPT ISR ISRO ISS

ISSA ISSI ISSLL ISSS ISSN

&

167

Integrated Switching Management Network International Standard Music Number Interactive SMS (GSM) 1. Inmarsat Serial Number 2. Intelligent Service Node (AT&T) 3. Information Systems Network (AT&T) 4. Initial Sequence Number Intelligent Services Network Applications Processor Inter-Islamic Network on Space Sciences and Technology Intermediate Signaling Network Identiﬁcation 1. International Standards Organization (Switzerland) 2. isolator Internet Society Interactive Service on Demand ISO Development Environment (OSI model) Isochronous Ethernet International Organization for Standardization Open System Interconnection model 1. Internet Service Provider 2. Internet Safety Policy 3. Inmarsat Service Provider 4. Integrated Service Provider 5. In-System Programmable 6. Information Service Platform 7. ISDN Signal Processor Integrated Services Private Branch Exchange 1. International Sound Program Center 2. International Signaling Point Code Instituto Superiore delle Poste e delle Telecomunicazioni (Italy) 1. Intermediate Session Routing (routing algorithm) 2. Interrupt Service Routine (computer) 3. International Simple Resale Indian Space Research Organization (India) 1. Inter-Satellite Service 2. Intelligent Services Switch 3. International Space Station (NASA) 4. Integrated Satellite Solutions Corporation Information Systems Security Association Inter-Switching System Interface Integrated Services over Speciﬁc Link Layers (QoS) Information Society Standardization System (ICT) Integrated Special Services Network

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168

&

IST ISTF ISU ISUP ISV ISVC IT IT&T ITA ITA1 ITA5 ITAA ITAB ITAC Italsat ITANZ ITAR ITB ITC

ITCA ITCC ITCI-DC ITCO ITDM ITESF ITF ITFS ITG

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Initial Service Term 2. Independent Sideband Transmission 3. Information Society Technologies Integrated Services Test Facility 1. Initial Signal Unit 2. Iridium Subscriber Unit ISDN User Part (SS7) Independent Software Vendor (ICT) Inmarsat Standard Voice Codec 1. Information Technology (ICT) 2. Inter-Toll Trunk Information Technology and Telecommunication 1. International Telegraph Alphabet 2. Integrated Trunk Access 3. Industrial Telecommunications Association International Telegraph Alphabet No.1 (ITU) International Telegraph Alphabet No.5 (ITU) Information Technology Association of America (standards) Information Technical Advisory Board 1. Information Technology Association of Canada 2. ISDN Terminal Adapter Circuit Italian Domestic Satellite System Information Technology Association of New Zealand International Trafﬁc in Arms Regulations (U.S. State Dept.) Intermediate Block Character (transmission) 1. International Transit Center 2. Independent Television Commission (broadcasting) 3. Information To Controller 4. International Teletrafﬁc Congress International Tele-Conferencing Association (U.S.A.) International Telecommunications Clearing Corporation Internet Training Centers Initiative for Developing Countries (ITU) Independent Telephone Company Intelligent Time-Division Multiplexer Internet Trafﬁc Engineering Solution Forum (Telcordia Co.) Interframe Time Fill 1. Instructional Television Fixed Service 2. International Toll Free Service Integrated Telemarketing Gateway (AT&T)

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Ii

ITI

ITIC iTIP ITM ITMC ITMN ITN ITO ITORP ITPD ITR ITRC ITS ITSec ITSO ITSP ITT ITU ITU-D ITU-R ITU-SB ITU-TS ITUR ITUSA ITV ITXC IU IUA IUS IUT

&

169

1. Interactive Terminal Interface (X.25) 2. Intelligent Transportation Infrastructure (U.S.A.) 3. Iran Telecommunication Industries 4. Idle Trunk Indicator Information Technology Industry Council (U.S.A.) iCalendar Transport-Independent Interoperability Protocol Information Technology Management 1. International Transmission Management Center 2. Iran Telecommunications Manufacturing Company Integrated Transmission Management Network 1. Independent Telephone Network 2. Inter-ofﬁce Transport Network International Telecommunication Organization IntraLATA Toll Originating Responsibility Plan Iran Telephone Planning and Development Company 1. International Telecommunication Regulations (ITU) 2. Internet Talk Radio 1. Information Technology Research Center 2. Iran Telecommunication Research Center 1. Institute for Telecommunication Sciences (U.S.A.) 2. Intelligent Transportation Systems Information Technology Security International Telecommunications Satellite Organization Internet Telephony Service Provider 1. International Telephone and Telegraph (company) 2. Invitation To Tender (contracts) International Telecommunications Union (standards organization) ITU-Telecom Development Sector ITU-Recommendation Sector ITU Standardization Bureau ITU-Telecommunication Standardization Sector Italy–Turkey–Ukraine–Russia (ﬁber optic cable consortium) Information Technology User’s Standards Association Interactive Television (broadcasting) Internet Telephony Exchange Carrier Interface Unit ISDN User Adaptation Layer Interim Upper Stage Implementation Under Test

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I

170

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IUW IV IVAN IVC IVCP IVD IVDM IVDS IVDT IVHS IVI IVMS IVN IVoD IVPN IVPO IVR IVS IW

IW3C2 IWA IWF IWG IWS IWTA IWU IWV IX IXC IXM IXO

Comprehensive Glossary of Telecom Abbreviations and Acronyms

ISDN Users Workshop Interactive Video (ICT) International Value-Added Network Inmarsat Voice Codec Installation Veriﬁcation Certiﬁcation Program 1. International Volume Discount 2. Inside Vapor Deposition (optical ﬁbers) 3. Integrated Voice/Data Integrated Voice and Data Multiplexer Interactive Video Data Service (FCC) Integrated Voice/Data Terminal Intelligent Vehicle Highway System Intel Video Interactive In-Vehicle Multiplexing System (standard) Intervening Network Interactive Video-on-Demand International Virtual Private Network Inside Vapor Phase Oxidation process (optical ﬁbers) Interactive Voice Response 1. Interactive Voice Service 2. Interactive Video Services 1. Inside Wiring (telephone wire) 2. intraworking 3. interworking 4. Information Warfare 5. Intelligent Workstation International World Wide Web Conference Committee Intelligent Workstation Architecture 1. Interworking Function (PLMN) 2. Internet Watch Foundation Intersessional Working Group (Inmarsat) Intelligent Work-Station International Wireless Telecommunications Associations 1. Internet Working Unit 2. Interworking Unit Impulse Wahlverfahren (German pulse dialing) Internet Exchange Inter-Exchange Carrier (long-distance telephone company) Inter-Exchange Mileage Information Exploitation Ofﬁce (DARPA)

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Jj J J Box J-Carrier J-hook J-SAC J0 J1 J2 J2ME JABWT JAD JAE JAM JAMSAT JANet JAR JARL JAROS JASC JASREP JATE JAXA

Symbol for Joule (unit of work and energy) Junction Box Japanese equivalent of T-Carrier J-shaped hook connector Journal on Selected Areas in Communications (IEEE) Regeneration section trace byte (MUX) Path trace byte (MUX) Path overhead byte (MUX) Java 2 Platform, Micro Edition Java Applets for Bluetooth Wireless Technology Joint Application Design Java Application Environment Jini Technology Access Module Japanese afﬁliate of AMSAT (satcom) Joint Academic Network (U.K.) Java Archive Japan Amateur Radio League, Inc. Japan Resources Observation System (organization) Japan Sea Cable Japan Ship Reporting system Japan Approvals Institute for Telecommunications Equipments Japan Aerospace Exploration Agency (Japan) 171

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J

172

&

JB7 JBIG JBOD JCALS JCC JCL JCSA JDAP JDBC JDC JDK JDS JEC JECF JECS JEDEC JEDI JEIDA JEMA JEPI JERS JES JESSI JET JF JFET .jﬁf JHTML JI JIOA JIPS JIS JISA JISC JIT JIVN JMA JMAPI JMOS JMTS

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Jam Bit 7 Joint Bitonal Image Group Just a Bunch Of Disks (storage technology) Joint Computer-aided Acquisition and Logistics Support Joint Call-back Center Job Control Language (IBM mainframes) Japan Computer Security Association Java Directory Access Protocol Java DataBase Connectivity Japanese Digital Cellular System Java Development Kit Japanese Digital Standard Jahan Electronic Company (Iran) Java Electronic Commerce Framework Job-by-Email Control System Joint Electronic Device Engineering Council (standards) Joint Electronic Document Interchange Japan Electronic Industry Development Association Japan Electronic Messaging Association Joint Electronics Payments Initiative (W3C) Japanese Earth Resource Satellite (remote sensing) Job Entry Subsystem Joint European Semiconductor Silicon Initiative Just-Enough-Time (protocol) Junction Frequency Junction Field Effect Transistor (semiconductors) Name extension for JPEG File Interchange Format (computer) Java and HTML (programming) Junction Isolation (electronics) Japan Institute of Ofﬁce Automation JANET Internet Protocol Service Japanese Industrial Standard Japan Information Service Association 1. Joint Information Systems Committee (U.K. ICT) 2. Japanese Industrial Standards Committee Just-In-Time (product manufacturing) Joint Intelligence Virtual Network Japanese Meteorological Agency Java Management Application Programming Interface Junction MOS (semiconductors) Jordanian Mobile Telephone System

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Jj

JMTSS JNT JOFX JOLT JOSS JOTP JOVIAL JPC JPCD .jpeg JPEG .jpg JPIX JPS JPSA JRC JRCC JRG GII JSAT JSC JSD JskyB JSP JST JT JTAC JTACS JTAG JTAPI JTC JTC3A JTEC JTFA JTG JTIDS JTK JTM

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173

Joint Multichannel Trunking and Switching System (military) Joint Network Team Java Open Financial Exchange Java Open Language Toolkit (project) Johnniac Open Shop System (programming language) Java Open Trading Protocol Junior Ofﬁcer’s Version of an Incomprehensible Arithmetic Language (programming) Joint Procurement Consortium Just Perceptible Color Difference Name extension for Joint Photographic Expert Group ﬁles Joint Photographic Experts Group (image format) Name extension for JPEG format Images ﬁles (computer) Japan Internet Exchange Joint Product Speciﬁcation Japan Personal Computer Software Association Japan Radio Company Joint (aeronautical and maritime) RCC (COMSAR) Joint Rapporteur Group Global Information Infra-structure Japan Satellite Systems (broadcaster) Johnson Space Center (U.S.A) Justiﬁcation Service Digit Japan sky Broadcasting (company) 1. Jackson Structured Programming (speciﬁcations) 2. Java Server Pages (speciﬁcations) Japan Solderless Terminal Jordan Telecom (operator) Japanese Total Access Communications Japanese Total Access Communications System Joint Test Action Group (IEEE) Java Telephony API Joint Technical Committee Joint Technical Command, Control, and Communications Agency Japanese Technology Evaluation Center Joint Time-Frequency Analysis (DSP) Jordan Telecom Group Joint Technical Information Distribution System Java Tool Kit Job Transfer and Manipulation (ﬁle transfer)

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J

174

&

JTRB JTRS JTSSG JUG JUNET JUNOS JUTCPS JVC JVM JvNCnet JWICS JXML

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Joint Telecommunications Resources Board Joint Tactical Radio Systems (U.S. Army) Joint Telecommunications Standards Steering Group Joint Users Group Japan Unix Network Juniper Networks Operating System Joint Uniform Telephone Communications Precedence System Victor Company of Japan Java Virtual Machine (software) John von Neumann Center Network Joint Worldwide Intelligent Communications System Java XML (programming language)

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Kk k K K&R C K-band kA Ka-band KACST KADS KAFOS KAI KARI kb kB KBC kBd KBHCA kb/s

1. Symbol for kilo denoting 1000 or 103 2. Symbol for kilo or 1024 of data elements 3. Symbol for a constant value (mathematics) 1. Symbol for Kelvin degree (unit of temperature) 2. Symbol for Cathode (circuit diagrams) 3. Symbol for Coefﬁcient of absorption (ﬁber optics) Brian Kernighan and Dennis Ritchie C programming Language Radio frequency band ranging from 10.9 to 36 GHz kiloampere Radio frequency band ranging from 18 to 22 GHz King Abdulaziz City of Science and Technology (Saudi Arabia) Knowledge Analysis and Design System (ICT) KARA Daniz Fiber Optic System (Turkey) Korea Aerospace Industries Ltd Korean Aerospace Research Institute (South Korea) kilobit, which is 1000 bits (transmission) kilobyte, which is 210 or 1024 bytes (computer) Korean Broadcasting Commission (South Korea) kilobaud (1024 baud) Thousand Busy Hour Call Attempts kilobits per second 175

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K

176

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

kbps kB/s kBps KBS kc kCHAR kCi KCI KCL KDC KDD KDDI KDE KDR KDT KEA keV KEYB KFPA kft kg kG kHz KIF KIS kLm KLY km km/s km/h KM KMBA KMID KMS KNet KNI KU KOMPSAT KP KPA KPI

kilobits per second kilobytes per second kilobytes per second Knowledge-Based System (ICT) kilocycle kilocharacter kilocurie Kerman Cable Industries (Iran) Kirchhoff’s Current Law (electronics) Key Distribution Center Kokusai Denshin Denwa Company, Ltd ( Japan) Kokusai Denshin Denwa International ( Japan) Kool Desktop Environment project (Linux) Keyboard Data Recorder (computer) Keyboard Display Terminal 1. Key Exchange Algorithm 2. Key Encryption Algorithm kiloelectronvolts keyboard K-band Full Performance Antenna kilofeet or one thousand feet kilogram kilogauss kilohertz (103 Hz) Knowledge Interchange Format Knowbots Information Service kilolumen klystron (tube) kilometer kilometer per second kilometer per hour Knowledge Management (ICT) Knowledge Management Benchmarking Association (ICT) Key Material Identiﬁer Knowledge Management System (ICT) Kangaroo Network product Katmai New Instructions set (Intel) Kiloohm (electronics) Korea Multipurpose Satellite program Key Pulsing Klystron Power Ampliﬁer Key Performance Indicator

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Kk

KQML KS KSIA ksps KSR KSU Kt KT KTA KTF KTI KTILA KTN KTS KTU Ku-band kV kVA kVAC kVDC KVL KVM KVM Switch kVp kVp-p kVr.m.s kW kWh KWIC KWOC

&

177

Knowledge Query and Manipulation Language (programming) Kearney System Korean Semiconductor Industry Association kilosymbols per second Keyboard Send and printer Receive (device) Key Service Unit knot 1. Symbol for Boltzman’s Constant-time Temperature 2. Korea Telecom Key Telephone Adapter Korea Telecom FreeTel (South Korea) Key Telephone Interface Development Center for Telecommunications (Greece) Kernel Transport Network Key Telephone System Key Telephone Unit Radio frequency band ranging from 11 to 14.5 GHz 1. kilovolt 2. Key Voice (telephone) kilovoltampere kilovolt Alternating Current kilovolt Direct Current Kirchhoff’s Voltage Law (electronics) K Virtual Machine (J2ME) Keyboard Video Mouse Switch kilovolt peak kilovolt peak-to-peak kilovolt r.m.s kilowatt kilowatt-hour Key word-In-Context (index) Key word Out of Context (index)

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K

Ll L

L-ADM L-band L-to-C L1 cache L2F L2 FET L2TP L2TPext L3 LA LAA LAAS LAB LAC LACE LACN

1. Symbol for an inductor or inductance (coil) 2. Symbol for Lambert (unit of luminance) 3. Symbol for Liter (unit of volume) 4. Symbol for Length (mathematics) Linear Add/Drop Multiplexer (MUX) Radio frequency band in the spectral region of 1.5 GHz L-band to C-band Level 1 cache (memory) Layer 2 Forwarding protocol (Cisco) Logic Level FET (semiconductors) Layer 2 Tunneling Protocol (VPNs) Layer 2 Tunneling Protocol Extension (Cisco) Layer 3 switching 1. Location Area 2. Line Adapter 3. Listed Address (Internet) Locally Administered Address Local Area Augmentation System (GPS) Logic Array Block 1. Loop Assignment Center 2. Location Area Code (GSM) Low-power Atmospheric Compensation Experiment Local Area Control Network 179

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L

180

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

LAD ladar LADS LADT LAE LAGEOS LAI LAIIX LAM LAMA LAMAR LAMM LAMMR LAMP LAN LANAC LANalyzer LANCE LANDA LANE LANNET LANS LAP LAP-B LAP-D LAP-F LAP-M LArc LAS LASA LASCR LASCS laser LASINT LASS LASSI

1. LATA Architecture Database 2. Life After Death (satcom) 3. Linear Amplitude Dispersion 1. laser detection and ranging 2. laser radar Local Area Data Service Local Area and Data Transport (transmission) Liquid Apogee Engine (satellites) Laser Geodynamics Satellite (U.S.A.) Location Area Identity (GSM) Los Angeles International Internet Exchange 1. Liquid Apogee Motor (satellites) 2. Line Adapter Module 3. Lobe Attachment Module Local Automatic Message Accounting Large-Area Modular Array of Reﬂectors (antennas) Large-Antenna Mini-M terminal (Inmarsat) Large-Antenna Multifrequency MW Radiometer Large Advanced Mirror Program Local Area Network Laminar Navigation Anti-Collision (aviation) LAN analyzer (networking) Local Area Network Controller for Ethernet Local Area Network Dealers Association (Canada) LAN Emulator (ATM) Large Artiﬁcial Neuron Network Local Area Network Services 1. Link Access Protocol 2. Link Access Procedure Link Access Procedure-Balanced (X.25) Link Access Procedure for D channel (ISDN) Link Access Procedure for Frame Relay Link Access Procedure for Modems 1. Lempel–Zive data Archiving program 2. Livermore Automatic research computer Low-Altitude Observation Satellite Large-Aperture Seismic Array (antennas) Light-Activated Silicon-Controlled Rectiﬁer (electronics) Light-Activated Silicon-Controlled Switch (electronics) Light Ampliﬁcation by Simulated Emission of Radiation Laser Intelligence Local Area Signaling Services (PBX) Low-Altitude Satellite Studies of Ionosphere

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Ll

LAST Lat LAT LATA LATNET LATTIS LAU LAVC LAWN LAWRS Lb LB LBA LBC LBEN LBI LBO LBRV LBS LBT LC

LCA LCAS LCC LCD LCE

&

181

1. Local Area Systems Technology 2. Large-Aperture Scanning Telescope latitude 1. Local Area Transport (transmission) 2. Local Area Terminal 3. Local Area Transit (DEC protocol) 1. Local Access and Transport Area (U.S. telephone) 2. Local Area Transport Arrangement Latvian Network Local Area Transport Tariff Information System Lobe Access Unit Local Area VAX Cluster Local Area Wireless Network Limited Airport Weather Station Symbol for pound (unit of weight) 1. Loop-Back 2. Leaky Bucket (ATM) Logical Block Addressing (enhanced IDE) 1. Linear Block Coding 2. Linked Boundary Condition Low-Byte Enable Load Balance Index (telephone company) Line Build Out (cables) Low-Bit-Rate Voice 1. Location-Based Services (wireless and cellular networks) 2. Load-Balancing System Listen Before Talk 1. Line Card 2. Line Clock 3. Leased Circuit 4. Lead Channel 5. Local Company 6. Local Channel 7. Inductance–Capacitance (circuit diagrams) 1. Logical Channel Assignment 2. Local Calling Area Link Capacity Adjustment Scheme Leadless Chip Carrier (circuit board mounting) 1. Liquid Crystal Display (electronics) 2. Loss of Cell Delineation (ATM) 3. Linear Collider Detector Line Conditioning Equipment

AU5866—CHAPTER L—L—12/7/2007—12:33—GANESHV—274414—XML MODEL E – pp. 179–193

L

182

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

LCI LCL LCM LCMS LCN LCOS LCP LCPGA LCR

LCS LCT LCU LCV LD

LD-AAC LD-CELP LDA LDAP LDB LDBS LDD LDDC LDE LDF LDGPS

1. Logical Channel Identiﬁer (X.25) 2. Line-Conducted Interference Longitudinal Conversion Loss 1. Line Control Module 2. Least Common Multiple 3. Line Concentrating Module Learning Content Management System (e-learning) 1. Logical Channel Number (ISDN) 2. Local Communication Network Liquid Crystal On Silicon (semiconductors) 1. Link Control Protocol (OSI model) 2. Left Circularly Polarized (antennas) Low-Cost Pin-Grid Array (microchips) 1. Least Cost Routing (service) 2. Line Concentrating Ratio 3. Level Crossing Rate 4. Inductance–Capacitance–Resistance (circuit diagrams) 1. Low-order Connection Supervision 2. Live Call Screening (feature) 3. Laboratory for Computer Science (MIT University) Large Capacity Trunk 1. Lightweight Computer Unit 2. Line Control Unit Line Code Violation (data encoding) 1. Long Distance 2. Line Driver 3. Laser Diode 4. Loop Disconnect Low-Delay Advanced Audio Compression Low-Delay Code-Excited Linear Prediction (voice coding) Long-Distance Alerting Lightweight Directory Access Protocol (network management) 1. Local Database 2. Long-Distance Bypass (switching) Local Database Services Limited Distance Dialing Long-Distance Direct Current (dialing system) Long-Delayed Echo 1. Local Distribution Frame 2. Lightwave Distribution Frame Local Differential GPS

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Ll

LDIP LDL LDM LDMC LDMOS LDMS LDN LDP LDR LDS LDT LDTV LDU LE LE ARP LEA LEAF LEAP LEAPS LEAS LEC

LECID LECS LED LEED LEF LEMS LEN LEO LEOS LEOW LEP

&

183

Long-Distance Internet Provider Long-Distance Line Limited Distance Modem Loop Data Maintenance Center Laterally Diffused MOS (semiconductors) Local Multipoint Distribution Service Listed Directory Number (PBX) Label Distribution Protocol (MPLS) Light-Dependent Resistor (semiconductors) Local Digital Switch 1. Line appearance on a Digital Trunk 2. Lightning Data Transfer bus Low-Deﬁnition Television 1. Line Director Unit 2. Local Distribution Utility 1. Local Exchange 2. LAN Emulator 3. Link Encapsulation LAN Emulator Address Resolution Protocol 1. Law Enforcement Authority 2. Longitudinally Excited Atmosphere (laser) 1. Law Enforcement Access Field 2. Large Effective Area Fiber Lightweight Extensible Authentication Protocol Long-term Equipment Anticipation Securities LATA Equal Access System 1. LAN Emulation Client (ATM) 2. Local Exchange Carrier (company) 3. Local Engineering Circuit 4. Loop Electronic Coordinator LAN Emulation Client Identiﬁer (ATM) LAN Emulation Conﬁguration Server (ATM) Light-Emitting Diode (electronics) Low-Energy Electron Diffraction Library-Exchange Format Low-Emission Mobile System 1. Line Equipment Number 2. Low-Entry Networking (SNA) Low Earth Orbit (satellite) Low Earth Orbit Satellite Low-cost Exploration Operator Workstation (image processing) 1. Large Electron Positron Collider 2. Light-Emitting Polymer

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L

184

&

LER LERG LES

LES-SIG LESA LESD LESI LESO LESV LETN LF LFA LFACS LFAP LFB LFI LFC LFN LFOV LFSR LFSS LG LGA LGC LGCI LGE LGN LGRS LGS LHARC LHC LHCN LHCP LHEP LHMC

Comprehensive Glossary of Telecom Abbreviations and Acronyms

3. Left Elliptically Polarized (antennas) Label Edge Router (MPLS) Local Exchange Routing Guide (Telcordia Technologies) 1. Land Earth Station (Inmarsat) 2. LAN Emulation Server (ATM) 3. Loop Emulation Service (ATM) 4. Label Edge Switch 5. Lincoln Experimental Satellite 6. Line Errored Second Land Earth Station Signaling channel (Inmarsat) Land Earth Station Assignment channel Land Earth Station Data channel Land Earth Station Interstation signaling channel Land Earth Station Operator (Inmarsat) Land Earth Station Voice channel Law Enforcement Television Network (broadcaster) 1. Low-Frequency (30–300 KHz range) 2. “Linefeed” (character control code) Loss of Frame Alignment Loop Facility Assignment and Control System Lightweight Flow Admission Protocol Look-ahead-For-Busy (information) Link Fragmentation and Interleave (VoIP) Large Format Camera (remote sensing) Long File Name (Microsoft standard) Limited Field-Of-View (radar) Linear Feedback Shift Register Link Failed Signal State Line Group Low-Gain Antenna Line Group Controller ISDN Line Group Controller Loop and Ground start Exchange card 1. Logical Group Node (ATM) 2. Logical Group Number Local Government Radio Service Loop and Ground start Subscriber card Lempel–Zive and Huffman data Archiving program Long-Haul Communications Long-Haul Communications Network Left-Hand Circular Polarization (microwave) Left-Hand Elliptical Polarization (microwave) Long-Haul Mileage Calculation

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Ll

LHOTS Li-Ion LIB LIC LID LIDAR LIDB LIF LIFO LIGBT LightSAR LIJP LILO LIM LIM-EMS LIMS LINC LINCOMPEX LINCS LINE LINX LIP LIPS

LIS

&

185

Long-Haul Optical Transmission Set Lithium-Ion (battery) Label Information Base (MPLS) 1. Light guide Interconnect Cable 2. Lowest Incoming Channel Line Identiﬁcation/Information Database 1. Light Detection And Ranging (remote sensing) 2. Laser Infrared radar Line Information Database 1. Location Interoperability Forum 2. Logarithmic Intermediate Frequency (ampliﬁer) 3. Low Insertion Force (sockets) Last-In, First-Out (buffer memories) Lateral Insulated-Gate Bipolar Transistor (semiconductors) Light Synthetic Aperture Radar Leaf Initiated Joint Parameter (ATM) Linux Loader 1. Line-access Interface Module (Ericsson) 2. Link Interface Module 3. Lotus Intel Microsoft (committee) Lotus Intel Microsoft—Expanded Memory Speciﬁcation 1. Legal Interception Management System 2. Laboratory Information Management System Laboratory Instruments Computer (MIT University) Linked Compressor and Expander Leased Interfaculty National Airspace Communications System Logistic Information Network Enterprise London Internet Exchange 1. Loop Initialization Protocol 2. Large Internet Packet (networking) 1. Lightweight Internet Person Schema (information retrieval) 2. Linear Inferences Per Second (AI machines) 3. Language Independent Program Subtitling Group (India) 1. Link Interface Shelf 2. Local Interconnection Service 3. Label Interface Structure (ISDN) 4. Logical IP Sub-network 5. Lightning Imaging Sensor (remote sensing)

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L

186

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

LISN LISP LISS LIST SERV LIT LIU LIU7 LL LLA LLB LLC LLC2 LLD LLDP LLF LLIF LLM LLP LLWAS lm lm/ft2 lm/m2 lm/W lms LM LMCS LMDS LME LMEI LMES LMF

1. Line Impedance Stabilization Network 2. Low-Incidence Support Network List Processing (programming language) 1. Linear Imaging Self-Scanner (remote sensing) 2. Low-Imaging Sensing Satellite (remote sensing) List Server (Internet) 1. Line Insulation Test 2. Logic Integrity Test Line Interface Unit Line Interface Unit for CCS 7 1. Leased Line 2. Link Level 3. Long Lines 1. Logical Layered Architecture 2. Low-Level Ampliﬁer 1. Line Loop-Back (function) 2. Local Loop-Back 1. Logical Link Control (OSI model) 2. Leadless Chip Carrier method (chip mounting) Logical Link Control 2 Low-Level Dispatcher Local Loop Demarcation Point 1. Line Link Frame 2. Low-Layer Function Linear LIF (ampliﬁer) L-band Land Mobile Low-level Protocol Low-Level Wind-shear Alarm System lumen (unit of luminous ﬂux) lumen per square foot lumen per square meter lumen per Watt lumen second 1. Linear Modulation 2. Line Monitor 3. Long-distance Marketer Local Multipoint Communications System Local Multipoint Distribution Service (Telcordia Technologies) Layer Management Entity Layer Management Entity Identiﬁer Land Mobile Earth Station Language Media Format

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Ll

LMGT LM Hosts LMI LMOS LMP LMR LMS

LMSS LMST LMU ln LN LNA LNB LNBF LNC LND LNMF LNNI LNP LNPA LNR LNRU LO LO-FERF LOA LOAD LOB

&

Lockheed Martin Global Telecommunications (company) LAN Manager Hosts (Windows ﬁle) 1. Local Management Interface (frame relay) 2. Logical Modem Interface Loop Maintenance Operations System Link Manager Protocol Land Mobile Radio 1. Land Mobile Service (ITU) 2. Land Mobile Station 3. Learning Management System (e-learning) 4. Library Management System 5. Loop Monitoring System 6. Local Measured Service 7. Local Message Switch 8. Location and Monitoring Service 9. Least Mean Square Error (algorithm for ﬁlters) Land Mobile Satellite Service Lightweight Multiband Satellite communications Terminal Line Monitor Unit 1. natural logarithm (mathematics) 2. Neperian logarithm (mathematics) 3. Napierian logarithm (mathematics) Linear Network 1. Low-Noise Ampliﬁer (satcom) 2. Launch Numerical Aperture (ﬁber optics) Low-Noise Block down-converter (satcom) Low-Noise Block Feed (satcom) Low-Noise Converter (satcom) Last Number Dialed Local Network Management Function LANE Network-to-Network Interface (ATM) Local Number Portability (cellular networks) Local Number Portability Administration 1. Low-Noise Receiver 2. linear Like New Repair and Update 1. Local Oscillator (electronics) 2. Local Operator Low-Order Far-End Receive Failure alarm (MUX) Letter Of Agency Laser Opto-Acoustic Detection Line Of Bearing (radio direction ﬁnding)

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187

L

188

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

LOC LOCAL TV LOD LODE LOF LOFAR log logFTC logamp LOH LOI LOM LON LONAL Long LOP

LOPA LOPSN LOPT Lorac Loran LORG LORO LOS LOTOS LOVC LOW LP

1. Loss Of Cell Delineation (ATM) 2. Large Optical Cavity (diode) 3. Lead-On-Chip package (microchips) Launching Our Communities Access to Local Television (Act) Letter Of Disconnect Large Optics Demonstration Experiment 1. Loss Of Frame (MUX) 2. Lowest Operating Frequency Low-Frequency Array (antennas) natural logarithm (mathematics) logarithmic Fast Time Constant (algorithm) logarithmic ampliﬁer Line Overhead (SONET) Letter Of Intend 1. Loss Of Multiframe (MUX) 2. List Of Materials (contracts) Local Operating Network Local Off Network Access Line Longitude 1. Loss Of Path 2. Loss Of Pointer (MUX) 3. Low-Order Path 4. Line Of Position Lower Order Path Adaptation Lower Order Path Sub-Network (MUX) Lower Order Path Termination (MUX) Long-range-accuracy (radio system) Long-range aid to navigation system Large-size Organizations (Microsoft) Lobe On Receive Only (radar) 1. Line-Of-Sight (microwave path) 2. Loss Of Signal 3. Launch On Schedule Language Of Temporal Ordering Speciﬁcation Lower Order Virtual Container (MUX) 1. Launch On Warning 2. Link Order Wire 1. Linear Polarization (wave) 2. Line Printer 3. Low-Pass 4. Low-Power 5. Low-Pressure 6. Long-Play (recording) 7. Log-Periodic (antenna)

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Ll

LPA LPAC LPC LPD

LPDT LPE LPES LPF LPFM LPI LPIC LPM LPMUD Lport LPP LPRF LPS LPT LPTV LQA LQR LR LRB LRC LRE

LRF LR FAX LRIC

&

1. Lower order Path Adaptation (MUX) 2. Linear Power Ampliﬁer Lossless Predictive Audio Compression 1. Linear Predictive Coding 2. Lower order Path Connection (MUX) 1. Line Pointer Daemon 2. Link Protocol Discriminator (GSM) 3. Low Probability of Detection (radio and optical signals) Low-Power Distress Transmitter Liquid Phase Epitaxy (semiconductors) Land Portable Earth Station Low-Pass Filter Low-Power FM (radio station) 1. Low Probability of Interception 2. Lines Per Inch (facsimile machine) IntraLATA Primary Interexchange Carrier 1. Lines Per Minute (printer speed parameter) 2. Library of Parameterized Modules (standard) Lars Pensjo Multiuser Dungeon Logical port 1. Link Peripheral Processor 2. Lightweight Presentation Protocol 1. Low-Power Radio Frequency 2. Low-Pulse-Repetition Frequency 1. Line Proﬁle System 2. Line Protection Switching (MUX) 3. Lightning Protection Subsystem 1. Lower order Path Termination (MUX) 2. Line Print Terminal (PC parallel port) Low-Power Television (service) Link Quality Analysis Linear Quadratic Regulator Location Register Least Reliable Bit Longitudinal Redundancy Check (transmission) 1. Low-bit-Rate Encoding 2. Line Regenerating Equipment 3. Lightwave Repeating Equipment 4. Long Reach Ethernet (Cisco) Laser Range Finder Low-Resolution Facsimile Long-Run Incremental Cost

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189

L

190

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

LRIT LRL LRM LRN LRR LRRM LRS LRU LS LS Trunk LSA

LSA diode LSAP LSAS LSB LSC LSCH LSCIE LSCIM LSCIT LSD LSDU LSE LSG LSI LSIC LSL LSMA LSMS LSN

Long-Range Identiﬁcation and Tracking of ships (IMO) Line-Reﬂect-Line (calibration) 1. Line-Reﬂect-Match (microwave) 2. Line Route Map Location Routing Number Long-Range Radar Line-Reﬂect-Reﬂect-Match (calibration) Line Repeater Station 1. Line Replaceable Unit 2. Least Recently Used 1. Local Switch 2. Linear Systems 3. Loop-Start (signal) Loop-Start Trunk 1. Leased Space Agreement 2. Limited Space-charge Accumulation 3. Link-State Advertisement (routing) 4. Local Service Agency Limited Space-charge Accumulation diode Link Service Access Point (ATM) Line Side Answer Supervision 1. Least Signiﬁcant Bit (in a byte) 2. Lower Sideband (modulation) 1. Least Signiﬁcant Character (in a string) 2. Lambda-Switched Capable (GMPLS) 3. Local Switching Center Low-Speed Channel Light guide Stranded-Cable Interconnect Equipment Light guide Stranded-Cable Interconnect Module Light guide Stranded-Cable Interconnect Terminal Low-Speed Data (Inmarsat) Least Signiﬁcant Digit (in a number) Link Layer Service Data Unit 1. Local Support Element 2. Local System Environment (OSI model) 3. Line Supervisory Equipment Large Signal Gain (nonlinear devices) 1. Large-Scale Integration (microchips) 2. Line Status Identiﬁcation Large-Scale Integrated Circuit Link Support Layer (networking) Large-Scale Multicast Applications Local Service Management System Local Signal Network

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Ll

LSNG LSO LSOA LSOD LSOG LSP

LSR

LSS LSSC LSSD LSSGR LSSU LSSW LSTP LSTTL LSU LSV LT LTA LTAC LTB LTC

LTCC LTCI LT CLASS LTCN LTCS

&

191

Large-Scale Networking Group 1. Local Service Ofﬁce 2. Laser Shut Off Local Service Order Administration system Laser Shut Off Disable Local Service Ordering Guidelines 1. Local Service Provider 2. Learning Service Provider (e-learning) 3. Link-State Packet (routing) 4. Label-Switched Path (MPLS) 1. Label Switching Router (MPLS) 2. Line Service Request 3. Local Service Request 4. Leaf Setup Request (ATM) Local Switching System Lower Sideband Suppressed Carrier Level-Sensitive Scan Design LATA Switching System General Requirements Link Status Signal Unit (SS7) Low-Speed Switch 1. Linear Search & Track Processor 2. Local Signal Transfer Point (mobile) Low-power Schottky Transistor-to-Transistor Logic (digital electronics) 1. Link-State Update (routing) 2. Logical Storage Unit 3. Line Switching Unit Line Status Veriﬁer 1. Line Terminal (MUX) 2. Logical Terminal 3. Lower Tester (ATM) Line Turn-Around (time) Lossless Transform Audio Coding Last Trunk Busy 1. Line Trunk Controller 2. Line Trafﬁc Coordinator 3. Longitudinal Time Code (satcom) 4. Longitudinal Transmission Check Low-Temperature Co-ﬁred Ceramic (substrate technology) Line Trunk Controller of ISDN Logical Terminal Class (ISDN terminal) Long-Term Care Network (TV broadcaster) Label Trafﬁc Control System

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L

192

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

LTDP LTE LTG LTGRP LTI LTID LTN LTNUM LTO LTP LTPA LTPB LTR LTRS LTS LTSA LTSN LTSP LTTB LU

LU6.2 LUF LUHF LULT LUM LUN LUNI LUNs LUNT LUT LUXPAC LVCMOS LVD LVDM LVDS

Line Terminator type DP 1. Line Terminating Equipment (MUX) 2. Long-Term Evolution (3GSM) Line Timing Generator Logical Terminal Group (ISDN) Linear Time Invariant Logical Terminal Identiﬁer (ISDN) Local Transport Network Logical Terminal Number (ISDN) Linear Tape-Open storage technology (HP and IBM) 1. Line Test Position 2. List Transmission Path Line Terminator type PA Line Terminator type PB 1. Line Terminal Regenerator 2. Local Transport Restructuring (FCC) Letters Shift 1. Loop Testing System 2. Lightwave Transmission System Linear Taper Slot Antenna Learning and Teaching Support Network (e-learning) Linux Terminal Server Project Line Terminator Test Board 1. Line Unit 2. Local Unit (SNA access port) 3. Logical Unit (networking) 4. Local Use ﬂag 5. Location Update (GSM) Logical Unit interface, Version 6.2 (IBM protocol) Lowest Usable Frequency Lowest Usable High Frequency Line-Unit-Line Termination (ﬁber optics) Line Utilization Monitor Logical Unit Number (computer) LANE User Network Interface (ATM) Logical Unit Numbers Line Unit Network Termination (ﬁber optics) 1. Local User Terminal (aviation) 2. Look Up Table Luxemburg Packet-Switched Network Low-Voltage Complementary MOS (semiconductors) Low-Voltage Differential (SCSI card) Low-Voltage Differential Multipoint Low-Voltage Differential Signal

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Ll

LVDT LVTTL LW LWER LWT lx LX LXC LZ77 LZARI LZB LZFG .lzh LZHUF LZJ LZJH LZMW LZP LZR LZS LZSS LZW

&

193

Linear Variable-Differential Transducer Low-Voltage Transistor-to-Transistor Logic (digital electronics) Long-Wave (radio broadcast band) Lightweight Encoding Rules (data encoding) Listen While Talk lux (unit of illumination) Local Exchange Long-distance Carrier Lempel–Ziv compression method developed in 1977 Lempel–Ziv Arithmetic (data compression method) Lempel–Ziv Bell (data compression method) Lempel–Ziv–Fiala–Green (data compression method) Name extension for ﬁles compressed with Lempel–Ziv (computer) Lempel–Ziv–Huffman (data compression method) Lempel–Ziv–Jakobsson (data compression method) Lempel–Ziv–Jeff–Heath (data compression method) Lempel–Ziv–Miller–Wegman (data compression method) Lempel–Ziv Prediction (data compression method) Lempel–Ziv–Roden (data compression method) Lempel–Ziv–Stac (data compression method) Lempel–Ziv–Sorer–Szymanski (data compression method) Lempel–Ziv–Welsh (data compression method)

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L

Mm m mA mbar mcd mCi m2 m3 m3/s M M bauds M bit M hop M port M VTS M&C M-ES M-Learning M-PSK M-quad

1. Symbol for preﬁx milli-, denoting one-thousandth or 10K3 2. Symbol for meter milliampere (electronics) millibar millicandela millicurie square meter cubic meter cubic meters per second 1. Symbol for preﬁx mega-, denoting 220 or 106 2. Mobile, radiodetermination, and amateur services (ITU-T) Megabauds Mark bit M-shaped hop (satellite transmission) Master port (FDDI Architecture) Marconi Video Telephone Standard Monitor and Control Mobile End System Mobile Learning (e-learning) M-ary Phase Shift Keying (modulation) Mini-quad (antenna)

195

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M

196

&

M/V M/W M/Yr M1 M2 M2M M5 M12 M13 M23 MA MAA MAAP MAC OS MAC

MACE MACs MACSAT MacTCP MAD MADAR MAdCaP MADN MADRE MAE MAF

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Motor Vessel (navigation) microwave Millions per Year Management interface 1 Management interface 2 Machine To Machine (interface) Management interface 5 Multiplex DS 1-to-DS 2 Multiplex DS 1-to-DS 3 Multiplex DS 2-to-DS 3 1. Multiple Access 2. Memory Address 3. Mobile Allocation (GSM) 1. MAC Access Arbitration 2. Maximum Acceptance Angle (optical waveguides) Maintenance And Administration Panel Macintosh Operating System 1. Media Access Control (MPLS) 2. Media-speciﬁc Access Control (protocol) 3. Monitoring, Alarm, and Control 4. Multiplexed Analog Components (TV broadcast format) 5. Maritime Air Communications 6. Mobile Advisory Council 7. Multiply Accumulate function (computer operations) 8. Macintosh computer 9. Message Authentication Code Macintosh Audio Compression and Expansion Moves, Adds, and Charges (phone system installation) Multiple Access Communications Satellite A Macintosh extension that allows Macintosh computers to use TCP/IP 1. Magnetic Anomaly Detector 2. Mean Average Difference 3. Monitoring And Diagnostic unit (Intelsat) Malfunction, Analysis, Detection, And Recording (avionics) Model for Advanced Capital Planning Multiple Appearance Directory Number (ISDN) Magnetic Drum Receiving Equipment (radar) 1. Metropolitan-Area Exchange 2. MERIT Access Exchanges 3. Macintosh Application Environment Management Application Function

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Mm

MAFET MAG magamp MAGIC MAGLEV magram mAh MAHO MAI MAINT MAIO MAJ MALLOC MAM MAMA MAMI MAMS MAMSK MAN MAO MAP

MAPI MAPOS MAPS MAR MARECS MARISAT MARS MARSIS MARTIAN

&

197

Microwave and Analog Front End Technology project magnetometer magnetic ampliﬁer Multidimensional Applications and Gigabit Internetwork Consortium Magnetically Levitated transportation system magnetic radar absorbing material milliampere-hour Mobile-Assisted Hand-Off (wireless) 1. Mobile Allocation Index 2. Multiple Access Interference 3. Message Alignment Indicator maintenance Mobile Allocation Index Offset (GSM) major (alarm) Multicast Address Allocation (IETF protocol) Major Account Manager Multiple ALOHA Multiple Access Modiﬁed Alternate Mark Inversion (code or signal) Marine Automatic Meteorological Station Multitone Auxiliary Manual Select Keyboard 1. Metropolitan-Area Network 2. manual Maintenance, Administration, and Operations 1. Manufacturing Automation Protocol (General Motors) 2. Mobile Application Part (GSM) 3. Maintenance and Administration Panel 4. Media Access Project 5. Maximum Power Messaging Application Programming Interface (Windows) Multiple Access Protocol Over SONET Measurement of Atmospheric Pollution from Satellite 1. Memory Address Register (computer) 2. Major Account Representative 1. Maritime European Communication Satellite 2. Maritime Experimental Comsat System Maritime Satellite Communications System (U.S.A) 1. Multicast Address Resolution Server (ATM) 2. Military Afﬁliated Radio System (U.S. Army) Mars Advanced Radar for Subsurface and Ionospher Sounding Mis-Addressed or Routed Telepacket In A Network

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M

198

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

MAS

MAS Lab MASC maser MASG MASP MASQ MASS MASTER MAT MATC MATD MATE MATEL MATR MATSE MATV MAU

MAX MaxCR MAYPAC mb Mb mbar Mbar MB MBA Mbaud

1. Multiple Address Systems (microwave) 2. Multi-agent Systems Laboratory 3. Multi-administration Satellite System 4. Mobile Application Subsystem 5. Minimum Average Surcharge Multi-agent Systems Laboratory (Massachusetts University) 1. Major Accounts Service Center 2. Multicast Address Set Claim (IETF) microwave ampliﬁcation by simulated emission of radiation Master Address Street Guide (database) Mediated Attribute Store Protocol masquerade (IP) Major Account Support Specialist Minimal Access Surgery by Telecommunication and Robotics Meridian Administration Tools (Northern Telecom) Major Account Technical Consultant 1. Maximum Acceptable Transit Delay 2. Multiple Antenna Transmit Diversity Modular Automatic Test Equipment (standard) Multiplex Automatic Telephone system Minimum Average Time Requirement Mobile Automatic Telephone System-Europe Master-Antenna TV system 1. Media Access Unit (LANs) 2. Medium Attachment Unit (transceiver) 3. Multistation Access Unit (networking) 4. Math Acceleration Unit 1. Media Access Exchange 2. maximum Maximum Cell Rate X.25 Packet-switched network of Malaysia millibarn Megabit, equal to 106 bits (transmission) millibar Megabar 1. Megabyte, which is 220 or 1024 times kilobytes (computer) 2. Macro Block Multibeam Antenna Megabaud

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Mm

MBB MBCO MBE MBG Mb/s MB/s MBGP Mbits MBM Mbone MBPA Mbps MBps MBR MBTS Mbus MByte MBR MBS MBSAT MBSR MBWA MBZS Mc MC

MC-MVIP MCA MCAS MCB MCC

&

199

1. Magnetic Blow-out Breaker 2. Moisture Barrier Bag Mobile Broadcasting Corporation (Japan) Molecular-Beam Epitaxy (semiconductors) Multilocation Business Group Megabit per Second Megabyte per Second Multicast Border Gateway Protocol Megabits Magnetic-Bubble Memory Multicast backbone (Internet) Multi beam Phased Array (antennas) Megabit per second Megabyte per second 1. Master Boot Record (hard disk or CD) 2. Memory Buffer Register (computer) Micro Base Transceiver Station (Motorola) 1. Message bus 2. Multiprocessor bus Megabyte 1. Memory Buffer Register 2. Minimum Bend Radius (optical waveguides) 1. Maximum Burst Size (ATM) 2. Mobile Broadband System 3. Marine Broadcast Station Multimedia Broadcasting Satellite (Japan) Mini BTS Sub-Rack (GSM) Management By Walking Around (Hewlett–Packard) Maximum Bandwidth Zero Suppression Megacycle (electronics) 1. Maintenance Center 2. multicarrier 3. Matrix Controller 4. Main Cross-connect Multichassis MVIP 1. Microchannel Architecture (IBM PCs) 2. Maximum Calling Area (access) Multichannel Access System Media Control Board 1. Mission Control Center 2. Maintenance Control Center 3. Maintenance Control Circuit 4. Mobile Control Channel 5. Mobile Country Code (GSM)

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M

200

&

MCCS mcd MCD MCDN MCDU MCDV MCE MCEB MCEF MCF MCG MCGA MCH MCHG MCHI MCHO mCi MCi MCI

MCID MCIF MCIT MCL MCLD MCLR MCM MCMI MCN MCNC

Comprehensive Glossary of Telecom Abbreviations and Acronyms

6. Mobile Communications Company (Iran) 7. Miscellaneous Common Carrier 8. Multiplex Control Computer 9. Microelectronics and Computer Technology Corporation Mechanized Calling Card Service millicandela (light intensity) 1. Magnetic Circular Dichroism 2. Manipulative Communications Deception MicroCellular Data Network Master Control and Display Unit Maximum Call Delay Variance (ATM) Manufacturing Cycle Efﬁciency Military Communications Electronics Board (U.S.A) Military Common Emergency Frequency 1. Multimedia Communication Forum 2. Message Conﬁrmation Frame 3. Meta-Content Format Magnetocardiograph (medicine) Multicolor Graphics Adapter (monitor resolution) Multipacket Command Handler Mass Change Mobile Communications Holdings Inc. Mobile Controlled Hand-Off millicurie Megacurie 1. Media Control Interface (Windows application programming) 2. Mobile Company of Iran 3. Microwave Communications Inc. (U.S.A) Malicious Call Identiﬁcation Miniature Card Implementer’s Forum Ministry of Communications and Information Technology (Iran) 1. Mercury Communications Ltd. (U.K.) 2. Microstrip Constrained Lens Modifying Calling Line Disconnect Maximum Cell-Loss Ratio (ATM) 1. Multichip Module (IC design) 2. Multicarrier Modulation Modiﬁed Coded Mark Inversion (data encoding) 1. Master Customer Number 2. Monitoring and Control Network Microelectronic Center of North Carolina

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Mm

MCNS MCP MCPA MCPC MCPW MCR MCRL MCS MCSE MCSP MCT MCTD MCU MCVF MCVFT MCW MCXO MD

MD-IS MD5 MDA MDAC MDAS MDB MDBS MDC MDCT MDDB MDF MDHCP

&

201

Multimedia Cable Network System 1. Microsoft-Certiﬁed Professional 2. Master Control Program Multicarrier Power Ampliﬁer Multiple Channel Per Carrier Microstrip Co-planar Waveguide (microwave) Minimum Cell Rate (ATM) Multimedia Communications Research Laboratory (Bell) 1. Maritime Communication System 2. Master Control System Microsoft-Certiﬁed System Engineer (Microsoft) Microsoft-Certiﬁed Solution Provider (Microsoft) 1. MOS-Controlled Thyristor (semiconductors) 2. Mobile Communications Technologies company (Iran) Maximum Cell Transfer Delay (ATM) 1. Multipoint Control Unit 2. Microcontroller Unit 3. Microcomputer Unit Multichannel Voice-Frequency Multichannel Voice-Frequency Telegraph Modulated Continuous Wave Microcomputer-Compensated Crystal Oscillator 1. Mini-Disk 2. Mediation Device 3. Message Display 4. Message Digest 5. Manufacturer Discontinued 6. Management Domain (X.400) Mobile Data Intermediate System Message Digest Version 5 (algorithm) Monochrome Display Adapter Multiplying Digital-to-Analog Converter (electronics) Multiple Database Access System Modiﬁed Duo-Binary (data encoding) Mobile Database Station 1. Meridian Digital Centrex (Northern Telecom) 2. Manipulation Detection Code (algorithm) Modiﬁed Discrete Cosine Transform (mathematics) Multidrop Data Bridge Main Distribution Frame (telephone exchange) Multicast DHCP (protocol)

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M

202

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

MDI MDIS MDK MDLP MDM MDMF MDN MDNS MDPE MDQ MDR MDRAM MDS MDSI MDSL MDSP MDT MDTRS MDU MDUS MDVC MDWDM ME MEA MEB MEBS MEC MECAB MECAL MECCA MECL MECOD MED MEDIA MEE

1. Medium-Dependent Interface 2. Multiple-Document Interface Meta Data Interchange Speciﬁcation Modem Developer’s Kit Mobile Data Link Protocol (cellular networks) 1. Modulator-Demodulator (modems) 2. Modulation Division Multiplexing Multiple Data Message Format Managed Data Network Managed Data Network Service Medium Density Polyethylene Market-Driven Quality (IBM) Mission Data Recorder (remote sensing) Multibank Dynamic RAM (memory) Multipoint Distribution System (Telcordia Technologies) 1. Message Delivery Service Interofﬁce 2. Mobile Data Solutions, Inc. (company) Moderate-speed DSL (access) Microwave Digital Signal Processor 1. Mobile Data Terminal 2. Mean Down-Time 3. Manufacturer Delegated Testing Mobile Digital Trunked Radio System 1. Message Display Unit 2. Multiple Dwelling Unit Medium-scale Data Utilization Station (remote sensing) Mobile Digital Voice Channel (cellular network) Metropolitan Dense Wavelength-Division Multiplexing Mediation Equipment (TMN) 1. Metropolitan Economic Area 2. Messaging Enabled Applications Megabit Erlang Bit rate Middle East Broadcast and Satellite (magazine) 1. Mobile E-Commerce 2. Middle East Communications (magazine) Multiple Exchange Carrier Access Billing Master Event Calendar Multiple Engineering Control Center Activity Motorola Emitter-Coupled Logic (digital electronics) Multiple Exchange Carriers Ordering and Design Manipulative Electronic Deception Missile Error Data Integration Analysis Multiple Equipment Engineering

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Mm

MEECN MEF Megapel MELCAS MEM MEMO MEMS MENIDS MEO MEP MERCAST MERIS MERS MES MES-SIG MESA MESC MESD MESFET MESHCO MESRP MESRQ MESS MESSR MESV METAREA METEOSAT METOP METRAN MeV MEW MEWS MEXE MF

MFAS

&

203

Minimum Essential Emergency Communications Network Maintenance Entity Function (TMN) Megapixel Mercury Exchange Limited Channel Associated Signaling Macroencoded Message (Inmarsat) Multimedia Environment for Mobiles (broadcasting) Microelectromechanical Systems (microwave) Manufacturer’s ENIDs (Inmarsat) Medium Earth Orbiting (satcom) Multiple Equipment Provisioning Merchant ship broadcast system Medium Resolution Imaging Spectrometer (remote sensing) Most Economic Route Selection 1. Mobile Earth Station (Inmarsat) 2. Master Earth Station Mobile Earth Station-Signaling channel (Inmarsat) Mobility for Emergency and Safety Applications Molecular Equipment Subcommittee for Communications MES Data channel (Inmarsat) Metal-Epitaxial Semiconductor Field-Effect Transistor Matn Ertebat Shabake Company (Iran) MES Response channel (Inmarsat) MES Request channel (Inmarsat) message Multispectral Electronic Self-Scanning Radiometer MES Voice channel (Inmarsat) Metrological Area (IMO) Meteorological Satellite Meterological Operational Polar-orbit (weather satellite) Managed European Transmission Network Megaelectronvolt Microwave Early Warning Missile Early Warning System Mobile Extension Environment (wireless) 1. Medium Frequency (300–3000 kHz range) 2. multifrequency 3. multiframe 4. multifunction Multiframe Alignment Signal

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M

204

&

MFC MFD MFJ MFlop MFLOPS MFM MFN MFOS MFP MFS MFSK MFTP MFV mg mG MG MBG MGC MGCP MGD Mget MGIF MGN MGT MGTS mH MH MHD MHDL MHEC MHEG MHEMT MHF MHI

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Multifrequency Coding 2. Microsoft Foundation Class 1. Microfarad (capacitance) 2. Mode Field Diameter (ﬁber optics) Modiﬁcation of Final Judgment (AT&T) Megaﬂop (computer speed) Million Floating-point Operations Per Second (computer speed) 1. Modiﬁed Frequency Modulation 2. Magnetic Field Modulation Metropolitan Fiber Network Multifunction Operations System (AT&T) Multifunction Peripherals 1. Metropolitan Fiber Systems 2. Macintosh File System 3. Modem Fault Simulator Multiple Frequency Shift Keying (modulation) Multicast File Transport Protocol Mehr Frequenz Verfahren (German for Tone Dialing) milligram milligauss 1. Master Group (MUX) 2. Megagauss Multilocation Business Group 1. Manual Gain Control 2. Media Gateway Controller Media Gateway Control Protocol (VoIP) MOS Gate Driver (electronics) Multiple get (Computer command) Mobile Gaming Interoperability Forum Multigrounded Neutral (conductors) Multi-Gigabit Transceiver Message Generator Trafﬁc Simulator millihenry (electronics) Modiﬁed Huffman (data compression method) magnetohydrodynamics Mimic Hardware Description Language (microwave) Midwestern Higher Education Commission Multimedia and Hypermedia information coding Expert Group Metamorphic High-Electron Mobility Transistor (microwave) Mobile Home Function Mitsubishi Heavy Industries

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Mm

MHIC MHM MHP MHS MHT MHTML MHW MHz mi mi2 mi/h MI MI-DFB MIA MIB MIBD MIBS MIC

MICE MICR micro MID MIDI MIDP MIDR MIDS MIF MIFR

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205

Microwave Hybrid Integrated Circuit Multiplexed Hierarchical Modeling Multimedia Home Platform (broadcasting) 1. Message Handling System/Service (e-mail) 2. Microwave Humidity Sounder (remote sensing) Mean Holding Time (telephone call) MIME encapsulation of aggregate HTML (programming) Magnetohydrodynamic Wave Megahertz (1,000,000 or 106 Hz) mile (unit of length) square mile mile per hour 1. Multiple Inheritance (object-oriented programming) 2. Micromodge Industries (Iran) Modulator Integrated-Distributed Feed-Back (laser diode) Media Interface Adapter 1. Management Information Base (ICT) 2. Module Interface Bus Minimum In-Band Dispersion Minimum BER Strategy 1. Microwave Integrated Circuit (microwave) 2. Monolithic Integrated Circuit 3. Minimum Ignition Current 4. Microphone (electronic diagrams) 5. Mode Indicate Common 6. Media Interface Connector 7. Mutual Interface Chart Mobile Interworking Control Element 1. Magnetic-Ink Character Recognition (scanners) 2. Magnetic-Ink Character Reading (scanners) microcomputer 1. Maritime Identiﬁcation Digits (Inmarsat) 2. Message Identiﬁer (ATM) 3. Minimum Dispersion Musical Instrument Digital Interface Mobile Information Device Proﬁle (J2ME) MES Identiﬁcation Record Multifunction Information Distribution System 1. Management Information File 2. Minimum Interworking Functionality Master International Frequency Register (ITU-R)

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M

206

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

MII Mike MIL MIL-STD MILNet Milstar MIM MIMD MIME MIMIC MIMO MIN MIP Mips MIR MIRAN MIS

MISFET MISR MISSI MITS MITT MIU MIX MJ MJU MKDIR MKS MKSA mL

1. Media Independent Interface (Ethernet) 2. Ministry of Information Industry (China) Slang term for Microphone Military speciﬁcation Military Standard Military Network (ARPANet) Military strategic and tactical relay (network) 1. Mechanically Induced Modulation 2. Metal–Insulator–Metal (capacitor) Multiple-Instruction, Multiple-Data stream (parallel processing) Multipurpose Internet Mail Extension (e-mail attachments) Microwave Monolithic Integrated Circuit Multiple-Input Multiple-Output 1. Mobile Identiﬁcation Number (cellular networks) 2. minor (alarm) 3. minimum Medium Interface Point Millions of instructions per second (processor speed) 1. Multiplex Input Router 2. Microwave Impulse Radar Missile Ranging 1. Management Information Systems (ICT) 2. Management Information Services (ICT) 3. Metal-Insulator Semiconductor 4. Mobile Internet Service Metal Insulator Semiconductor Field Effect Transistor Multiangle Imaging Spectroradiometer (remote sensing) Multilevel Information Systems Security Initiative Microinstrumentation and Telemetry Systems Ministry of Information Technology and Telecommunications Modem Interface Unit 1. mixer 2. Multinational Internet Exchange 3. Multicasting International Exchange Modular Jack (telephone cable) Multijunction Unit Make a new Directory (MS DOS Command) Meter-kilogram-Second (parametric unit) Meter-kilogram-Second-Ampere (parametric unit) milliliter

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Mm

MLA MLB MLC MLCM MLD MLE MLHG MLI MLID MLK MLL mlm MLM MLP MLPP MLS MLSC MLST MLT MLT-3 MLTS MLU mm MM MMAC MMB MMC

&

1. Mail List Agent 2. Microwave Link Analyzer Multilayer Board 1. Multilevel Coding 2. Monolithic Multilayer Capacitor (electronics) Multilevel Coded Modulation 1. Maximum Likelihood Decoding 2. Multilevel Coded Modulation 3. Median Level Depressions fading Maximum Level Error algorithm Multiline Hunt Group Multiple Link Interface (networking) Multiple Link Interface Driver (networking) Mail List Key 1. Monthly Leased Line 2. Multimedia Learning Lab (e-learning) millilumen 1. Meridian Link Module 2. Multilongitudinal Mode (laser) 1. Multilevel Precedence 2. Micro Leadframe Package (microwave) Multilevel Precedence and Preemption Microwave Landing System Multiple Low-Speed CSU (PBX) Minimum Line Scan Time 1. Mechanized Line Testing equipment 2. Mechanical Loop Test Multilevel Transmit-3 levels Multiple Language Text System (TV subtitles) Mobile Locator Unit (GSM) millimeter (10K3 meter) 1. Man–Machine 2. Mobility Management (GSM) 3. Mutimedia Multimedia Mobile Access Communication 1. Multimaster Bus 2. Millimetric Band (ETSI) 3. Mass Media Bureau (FCC) 1. Maintenance, Monitoring, and Control 2. Man–Machine Communication 3. Mobile Multimedia Communication project 4. Mobile Maritime Committee (U.S. Coast Guard) 5. Multimedia Multiparty Conferencing

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207

M

208

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

MMCA MMCD MMCF MMCX MMDC

MMDS MME

MMEG mmf MMF MMFD MMFS MMI MMIC MMITS MMJ MML MMM MMMS MMMSec MMN MMP MMPS MMR MMS

6. Multimode Communications 7. Multimedia Card (Flash memory) Multimedia Card Association Multimedia Compact Disk Multimedia Communication Forum Multimedia Communication Exchange 1. Massachusetts Microprocessor Design Center (U.S.A) 2. Multimedia and Digital Communications laboratories 3. Multimedia Desktop Collaboration (software) 4. Multimedia Development Center 5. Multimode Data Compression 6. Multiple Module Data Computer 7. Multiservice Multicarrier Distributed Communications Multichannel Multipoint Distribution Service 1. Mobility Management Entity 2. Multimedia Message Entity 3. Microsoft Mobile Explorer 4. Mobile Meteorological Equipment Multimedia Expert Group (WAP Forum) magnetomotive force (voltage) 1. Mobile Management Forum 2. Multimode Fiber 3. Maximum Modulating Frequency micromicrofarad (electronics) Manufacturing Message Format Standard 1. Man-to-Machine Interface 2. Multimedia Interface Monolithic Microwave Integrated Circuit Modular Multifunction Information Transfer System Modiﬁed Modular Jack (computer) Man–Machine Language (programming) 1. Multimedia Messaging 2. Multimedia Mail Multimedia Mail Service Multimedia Mail Security Multimedia Network Man–Machine Processor Milstar Message Processing System 1. Mobile Marine Radio Inc. 2. Modiﬁed Modiﬁed Read (compression method) 1. Multimedia Messaging Service (GSM) 2. Multiplex Management System (TV access)

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Mm

MMSC MMSE MMSER MMSI MMSK MMSP MMSS MMSU MMT MMTA MMTF MMU MMUSC MMVF MMW MMX MNA MNA7 MNC MNLP MNO MNOS MNP MNP10 MNRP MNRU MNRZ MNS .mn.us .mo

&

209

3. Maritime Mobile Service 4. Modular Measurement System 5. Meteorological Measurement System 6. Manufacturing Message Speciﬁcation (ISO) Multimedia Messaging Service Center (GSM) 1. Minimum Mean Square Error 2. Multimedia Messaging Service Environment Minimum Mean Square Error Reception 1. Maritime Mobile Service Identity code (Inmarsat) 2. Manchester Museum of Science & Industry Modiﬁed MSK (modulation) Modular Multisatellite Preprocessor Maritime Mobile Satellite Service Modular Metallic Service Unit Multimedia Terminal Multimedia Telecommunications Association (standards) Mean Mission Time to Failure 1. Manned Maneuvering Unit (U.S. space shuttle) 2. Memory Management Unit (processors) Multiparty Multimedia User Session Control (IETF) Multimedia Video File (NEC) millimeter Wave (microwave) 1. Multimedia Extension (processors) 2. Matrix Math Extensions (processors) Multimedia Network Applications Multiple CCS7 Network Addresses Mobile Network Code (GSM) Mobile Network Location Protocol (cellular network) Mobile Network Operator Metal-Nitride-Oxide Semiconductor 1. Microcom Networking Protocol (data compression) 2. Mobile Number Portability (cellular network) Microcom Networking Protocol Class 10 (cellular networks) Mobile Network Registration Protocol (cellular network) Modulated Noise Reference Unit Modiﬁed Non-Return-to-Zero level (data encoding) Master of Network Science (3COM) Internet domain name extension for the addresses located in Minnesota, United States Internet domain name extension for the addresses located in Macao

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M

210

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

MO MOA MobMan Mobo MOC MOCT MOCVD MOD modec modem MODFET MODIS MOEMS MOF MOH mU MU MOL MOM MOMA MOMBE MONET MOO MOON .moov MooV MOP MOPA MOPS MOPTT MOR MORC

1. Magneto-Optical 2. Master Oscillator Mobitex Operators Association (Korea) Mobility Management system (Inmarsat) Motherboard (computer) Mobile Originating Call (GSM) Multiorder Cancellation Technique (microwave) Metal-Organic Chemical Vapor Decompression (semiconductors) 1. modulator 2. Magneto-Optical Disk modem and codec (device) modulator and demodulator (device) Modulated-Doped FET (semiconductors) Moderate-resolution Imaging Spectrometer (remote sensing) Micro-Optical Electromechanical Systems Magneto-Optical Filter Development Group Music On Hold (PBX) milliohm (electronics) Megaohm (electronics) Manned Orbiting Laboratory (satcom) 1. Master Oscillator Module 2. Message Originated Middleware Message Originated Middleware Association (standards) Metal-Organic Molecular-Beam Epitaxy (semiconductors) 1. Multiwavelength Optical Network 2. Mobile Internet MUD Object-Oriented Magneto Optical On Network Name extension for QuickTime MooV video ﬁles (computer) The ﬁle format for QuickTime Movie ﬁles (computer) 1. Method Of Procedure (SONET) 2. Maintenance Operations Protocol Master-Oscillator Power-Ampliﬁer (electronics) 1. Minimum Operational Performance Standards 2. Millions of Operations Per Second (processors) Ministry Of Post Telegraph and Telecommunications (Lebanon) Multiwavelength Optical Repeater Multi-output Resonant Converter

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Mm

morphing MOS MOSFET MOSIGT MOSPF MOSS MOST MOTIS MOTO MoU .mov MOV MOVPE MP MPC MP-MLQ MP/M MP1 MP2 MP3 MP4 MPC

MPDS .mpeg MPEG MPFM mpg MPG MPI MPLS MPM

&

211

metamorphosing (graphics) 1. Metal-Oxide Semiconductor (integrated circuits) 2. Mean Opinion Score (voice quality) 3. Marine Observation Satellite Metal-Oxide Semiconductor FET (semiconductors) Metal-Oxide Semiconductor Insulated-Gate Transistor Multicast OSPF (routing protocol) MIME Object Security Services Metal-Oxide Semiconductor Transistor (semiconductors) Message-Oriented Text Interchange System (ISO) Mail Order Telephone Order 1. Minutes of Use 2. Memorandum of Understanding Name extension for Movie ﬁle in Apple’s QuickTime format Metal-Oxide Varistor (semiconductors) Metal-Organic Vapor Phase Epitaxy (semiconductors) 1. Multiport 2. Multilink Protocol Multilink Protocol Plus Multipulse-Maximum Likelihood Quantization Multitasking Program for Microcomputers (operating system) MPEG layer-1 (audio encoding) MPEG layer-2 (video encoding) MPEG layer-3 (audio encoding) MPEG layer-4 (video encoding) 1. Multiport Cluster 2. Multiport Card 3. Multimedia Personal Computer 4. MPOA Client (ATM) Mobile Packet Data Service (Inmarsat) Name extension for MPEG image ﬁles (computer) Motion-Pictures Experts Group (data compression standard) Motion-Picture File Manager File extension for encoded data streams containing compressed information using MPEG format 1. Microwave Pulse Generator 2. Multiple-image Portable Graphics 1. Multi Path Interface 2. Media Platform Interface Multiprotocol Label Switching (IETF) Master Processor Module

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M

212

&

MPML MPMP MPN MPoA MPOE MPOP MPP MPPP MPPS MPR MPS MPSC MPSK MPT MPTN MPTy MPU MPX MQA MQFP MQW mR MR mrad MRAM MRC MRCC mrd mrem mrep MRFR MRI MRN MRNS

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Main Proﬁle Main Level (MPEG-2) Microwave Point to Multipoint 1. Mode-Partition Noise 2. Manufacturer’s Part Number Multiprotocol over ATM Minimum Point Of Entry 1. Minimum Point Of Presence 2. Metropolitan Point Of Presence 1. Multichannel Point-to-point Protocol 2. Massively Parallel Processor Multilink Point-to-Point Protocol Million Packets Per Second (LANs and WANs) Maximum Pulse Rate 1. Multipage Signal 2. Mobile Positioning Service Multiprotocol Serial Controller Multiple Phase-Shift Keying (modulation) Ministry of Post and Telecommunications (Lebanon) Multiprotocol Transport Networking (IBM) multiparty (GSM supplementary service) 1. Main Processor Unit (computer) 2. Microprocessor Unit (computer) 3. Message Processor Unit multiplex Multiple Queue Assignment (PBX) Metric-pitch Quad Flat-Pack (microchips) Multiple-Quantum Well structure (semiconductors) milliroentgen 1. Message Router 2. Modem Ready (modem light) 3. Magnetic Resonance milliradian Magnetic RAM (memory) 1. MF Receiver Card 2. Microwave Radio Communications (company) Maritime Rescue Coordination Center (COMSAR) millirad millirem millirep Master Reference Frequency Rack Magnetic Resonance Imaging (medicine) 1. Mobile Roaming Number 2. Maritime Radio Navigation (ITU) Maritime Radio Navigation Service (ITU)

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Mm

MRNSS MROP MRP MRR MRSC MRSII MRTIE MRU ms mS MS

MS-AIS MS-DOS MS-FF MS-SPRing MSA MSAN MSAS MSat MSATCOM MSAU MSB MSBVW MSC

MSCS MSD MSDN

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213

Maritime Radio Navigation Satellite Service (ITU) Marine Radio Operator Permit (FCC) 1. Multiservice Route Processor (Cisco) 2. Materials Resource Planning Monthly Recurring Revenue Maritime Rescue Coordination Sub-Center (COMSAR) Minimum Request Sequence Initiation Interval Maximum Relative Time Interval Error 1. Maximum Receive Unit 2. Mountain Rescue Unit (COMSAR) millisecond (10K3 of a second) millisiemens 1. Mobile Station (GSM) 2. Mobile Service 3. Message Storage 4. Message Switch 5. Multiplex Section (MUX) 6. Microprocessor System 7. Microsoft (company) 8. Military Standard Multiplex Section, Alarm Indication Signal (MUX) Microsoft Disk Operating System Master-Slave Flip-Flop (digital electronics) Multiplex Section-Shared Protection Ring (MUX) 1. Metropolitan Statistic Area (cellular networks) 2. Message Service Application 3. Multiplexer Section Adaptation MultiService Access Node MTSAT Satellite-based Augmentation System (Japan) Mobile Satellite (AMSC of Canada) Mobile Satellite Communications Multistation Access Unit (networking) Most Signiﬁcant Bit (in a byte) Magneto-Static Backward Volume Waves (microwave) 1. Most Signiﬁcant Character (in a string) 2. Mobile Services Switching Center (GSM) 3. Management Services Contractor 4. Meteorological Satellite Center (remote sensing) 5. Maritime Safety Committee (IMO) 6. Malaysian Multimedia Super Corridor Microsoft Cluster Server (Windows NT) 1. Medium Speed Data (Inmarsat) 2. Most-Signiﬁcant Digit (in a number) Multiservice Data Network

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M

214

&

MSDSL MSE msec MSED MSF MSFVW MSG MSI MSIN MSISDN MSIX MSK MSL MSME MSMQ MSMT MSN MSNF MSO MSOH MSOP MSP

MSPP MSPS MSR

MSRN MSS MSSC

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Multirate Symmetrical DSL (access) 1. Mobile Subscriber Equipment 2. Mean Square Error (MUX) millisecond Minimum Squared Euclidean Distance 1. Mobile Serving Function 2. Multiservice Switching Forum Magneto-Static Forward Volume Waves (microwave) Message 1. Maritime Safety Information (COMSAR) 2. Medium-Scale Integration (microchips) 3. Modular Station Interface Mobile Station Identiﬁcation Number Mobile Subscriber ISDN number Metered Service Information Exchange Minimum-Shift Keying (modulation) 1. Mirror Server Link (networking) 2. Multisatellite Link (satcom) Multiplexing and Signaling Management Equipment Microsoft Message Queuing Micro Surface-Mount Technology (electronics) 1. Microsoft Network 2. Mobile Station Number (GSM) 3. Multiple Subscriber Numbering (ISDN) Multisystem Networking Facility 1. Multiple System Operator (cable TV) 2. Marine Safety Ofﬁce (U.S.A.) Multiplex Section Over head (MUX) Micro Small Outline Package 1. Message Security Protocol (Internet) 2. Mixed Signal Processor 3. Multiplexer Section Protection switching (MUX) 4. Metropolitan Service Provider Mobile Solutions Partner Program (Microsoft) Million of Samples Per Second 1. MES Status Record 2. Microwave Scanning Radiometer (remote sensing) 3. Magnetic-inductance Super Resolution 4. Maximum Stufﬁng Rate (data communications) Mobile Station Roaming Number (GSM) 1. Mobile Satellite Services (ITU) 2. Multispectral Scanner (remote sensing) 3. MAN Switching System Maritime Satellite Switching Center

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Mm

MSSE MSSW MST MST-RR MSTS MSTU MSTV MSU

MSUA MSV MSW MSX MSymbol/s MT

MTA

MTBF MTBM MTBO MTBPM MTC MTD MTF MTFT MTG MTI MTIE MTL

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215

Master of Science in Software Engineering Magneto-Static Surface Wave 1. Multiplexer Section Termination function (MUX) 2. Maintenance Support Terminal Multiplex Section Termination for Sub-STM-1 RadioRelay (MUX) Mobile Subscriber Test System Main Signal Transmission Unit Association for Maximum Service Television 1. Message Signaling Unit (SS7) 2. Microwave Sounding Unit (remote sensing) 3. Mobile Subscriber Unit 4. Mobile Satellite Unit 5. Modem Sharing Unit Mobile Satellite Users Association Master Supervisory Equipment Magneto-Static Wave Mobile Switching Exchange (cellular networks) Mega Symbols per second (TV) 1. Message Transfer 2. Message Type (ATM) 3. Machine Translation (computer) 4. Maroc Telecom (Moroccan operator) 5. Mobile Termination 1. Message Transfer Agent (X.400) 2. Macintosh Telephony Architecture 3. Major Trading Area 4. Microwave Transition Analyzer Mean Time Between Failures (production rating) Mean Time Between Maintenances (production rating) Mean Time Between Outages (production rating) Mean Time Between Preventive Maintenances 1. Mobile Terminating Call (GSM) 2. Mobile Telecommunications Company (Kuwait GSM operator) 1. Memory Technology Driver 2. Moving-Target Detection (radar) Modulation Transfer Function (optical ﬁber) Multilayer Thick-Film Technology Multiplexer Timing Generator Moving-Target Indicator (radar) Maximum Timing Interval Error 1. Merged-Transistor Logic (digital electronics) 2. Message Transfer Layer

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M

216

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

MTM MTP MTPI MTPT MTR MTS

MTSAT MTSO MTSR MTTF MTTR MTTSR MTU MTV MTX MU MUA MUD MUF MULDEM MULTICS MUMPS MUNDIS MUP MUS MUSA MUSE

1. Maintenance Trunk Monitor 2. Mean Time of Maintenance (production rating) 3. McLintock Theater Model 1. Message Transfer Part (SS7) 2. Media Termination Point (VoIP) 3. Many-Time Programmable memory Multiplexer Timing Physical Interface (MUX) Ministry of Transportation, Post and Telecommunications Master Time Reference 1. Message Telecommunications Service (regulation) 2. Message Transfer Service 3. Message Telephone System 4. Multichannel Television Sound 5. Microsoft Terminal Server 6. Member of Technical Staff Multifunctional Transport Satellite Mobile Telephone Switching Ofﬁce Mean Time to Service Restoral (production rating) Mean Time To Failure (production rating) Mean Time To Repair (production rating) Mean Time To Service Restoral (production rating) 1. Maximum Transmission Unit (data packets) 2. Multiple Tenant Unit 3. Maintenance Termination Unit Magyar Television (broadcaster) Mobile Telephone Exchange (Northern Telecom) Monitoring Unit (wireless) Multiuser Agent 1. Multiuser Dungeon (Internet games) 2. Multiuser Domain (Internet games) Maximum Usable Frequency Multiplexer-Demultiplexer Multiplexed Information and Computing System Massachusetts Utility Multiprogramming System Multiplexed Network for Distributed and Interactive Services Management of User Part Marine Utility Station Multiple-Unit Steerable Antenna 1. Multiple-SubNyquist Sampling Encoding (compression) 2. Multi-User Simulation Environment

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Mm

MUSICAM MUSR MUT MUX MUXER MUXing mV mVAC mVDC MV MVA MVBR MVDDS MVDS MVIP MVL

MVNE MVNO MVP MVPD MVPN MVS mW MW MWh MWI MWIF MWR MWV Mx MXB MXR MZI

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217

Masking Pattern Adapted Universal Sub-band Integrated Coding And Multiplexing (Audio broadcasting) Maximum User Signaling Rate Multiuser Talk (chat program) multiplexer multiplexer multiplexing millivolt millivolt Alternating Current millivolt Direct Current 1. Megavolt 2. macrovision Megavoltampere multivibrator (digital circuit) Multichannel Video Distribution and Data Service Multipoint Video Distribution System Multivendor Integration Protocol (Telcordia Technologies) 1. Multiple Virtual Lines (access technology) 2. Multimedia Virtual Laboratory (Japan) 3. Multimedia and Visualization Laboratory (Original of MLL) Mobile Virtual Network Enabler Mobile Virtual Network Operator 1. Multichannel Video Programming 2. Multimedia Video Processor Multichannel Video Programming Distribution (cable TV) Mobile Virtual Private Number Multiple Virtual Storage (IBM mainframes) milliwatt (10K3 Watts) 1. Megawatt (106 Watts) 2. Medium Wave (radio broadcast band) 3. microwave Megawatt-hour Message Waiting Indicator (telephone set) Mobile Wireless Internet Forum Microwave Radiometer (test equipment) Maximum Working Voltage Maxwell (unit of magnetic ﬂux) Matrix Board 1. multiplexer 2. mixer Mach–Zehnder Interferometer

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M

Nn n nA N

N&SS N-AMPS N-ISDN N-MOS N-Port N-TACS N/A N/I N/m2 NA NA-TDMA

1. Symbol for preﬁx nano-, denoting one-billionth or 10K9 2. Symbol for an integer number (mathematics) nanoampere (electronics) 1. Symbol for Newton 2. Symbol for any integer Number bigger than 1 (mathematics) 3. Symbol for Noise 4. Symbol for Negative (semiconductors) 5. Symbol for Narrow-band Network and Systems Support Narrow-band AMPS Narrow-band ISDN N-channel MOS (semiconductors) Node Port Narrow-band TACS (Motorola) 1. Not Available (documents) 2. Not Applicable (documents) Noise-to-Interference (ratio) Newton per square meter 1. Network Administration 2. Numerical Aperture (antenna) North American TDMA 219

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N

220

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

NAB NABTS NAC

NACC NACD NACIC NACISA NACK NACME NACN NACS NACSEM NACSIM NAD NADC NADF NADN NADP NADTP NAEC NAK NAL NAM NAMAS NAMPS NAMTS NANC NAND NANOG NANP

1. National Association of Broadcasters (U.S.A.) 2. National Alliance of Business North American Basic Teletext Speciﬁcation 1. Network Access Center 2. Network Access Control 3. Network Applications Consortium 4. Numbering Advisory Committee 5. Null Attachment Concentrator North American Calibration Cooperative Network Autonomous Commanding Display National Counterintelligence Information Center NATO Communications and Information Systems Agency Negative Acknowledged (control character) National Action Council for Minorities in Engineering North American Cellular Network Network Analysis Control Surveillance National Communications Security Emanation Memorandum National Communications Security Information Memorandum Network Access Domain North American Dual-mode Cellular system North American Directory Forum Nearest Active Downstream Neighbor (LANs) North American Directory Plan National Association of Desktop Publishers Novell Authorized Education Center (Novel, Inc.) Negative Acknowledgement (control character) 1. National Aerospace Laboratory (Japan) 2. Network Access Line 1. Number Assignment Module (cellular networks) 2. National Account Manager 3. National Association of Manufacturers (U.S.A.) National Measurement Accreditation Service Narrow-band Advanced Mobile Phone System (cellular networks) Nippon Advanced Mobile Telephone System (Japan) North American Numbering Council A combination of a NOT and an AND gate (digital electronics) North American Network Operator’s Group (U.S.A.) North American Numbering Plan

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Nn

NANPA NAOM NAP NAPI NAPLPS NAPP NAPT NAR NARS NARSAP NARTE NARUC NAS

NASA NASC NASCOM NASDA NASDAQ NASTD NAT NATA NATD NATI NATOA NAU NAUCS NAUN NAV NAVAR

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221

North American Numbering Plan Administration National Accounts Operations Manager 1. Network Access Point (Internet backbone) 2. Network Access Provider 3. National Attachment Point (Internet) Numbering/Addressing Plan Identiﬁer North American Presentation-Level Protocol Syntax National Aerial Photography Program Native American Public Telecommunications, Inc. Network Access Register (Centrex) Network Audio Response System National Advanced Remote Sensing Application Program National Association of Radio and Telecommunications Engineers (U.S.A.) National Association of Regulatory Utility Commissioners (U.S.A.) 1. NetWare Access Server 2. Network Access Server 3. Network-Attached Storage (storage device) 4. National Academy of Science (U.S.A.) National Aeronautics and Space Administration (U.S.A.) 1. National Aeronautics and Space Council (U.S.A.) 2. Number Administration and Service Center NASA Communications Network (U.S.A.) National Space Development Agency (Japan) National Association of Security Dealers Automated Quotation National Association of State Telecommunications Directors Network Address Translation (VPNs) 1. North American Telephone Association 2. National Association of Testing Authorities National Association of Telecommunications Dealers Not A Telecom Issue National Association of Telecommunications Ofﬁcers and Advisors (U.S.A.) Network Addressable Unit (IBM SNA) Network Access Usage and Cost System Nearest Active Upstream Neighbor (LANs) 1. Network Applications Vehicle 2. Network Allocation Vector 3. Net Asset Value Navigation And Ranging (radar)

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N

222

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

NAVAREA NAVSAT NAVSTAR Nax NB NBA NBC NBDP NBF NBFCP NBFM NBFP NBH NBMA NBP NBPM NBRVB NBRVF NBS NBSP NBSV NC

NC&A NCA NCACHE NCAR NCAS NCB NCBS NCC

NCCF

Navigational Area (IMO) Navy Satellite system (U.S.A.) Navigation System using Time And Ranging (satellite) Network Faxing 1. Narrow-Band 2. Normal Burst Nominated Barring Authority (Inmarsat) 1. National Broadcasting Company 2. Network Bus Controller 3. Non-Backward Compatible (softwares) Narrow-Band Direct-Printing Net BIOS Frame Net BIOS Frames Control Protocol Narrow-Band Frequency Modulation Net BIOS Frame Format Protocol Network Busy Hour Non-Broadcast Multiple Access 1. Name Binding Protocol (networking) 2. Net BIOS Protocol Narrow-Band Phase Modulation Narrow-Band Radio Voice Bandwidth Narrow-Band Radio Voice Frequency National Bureau of Standards (now NIST) Non-Breaking Space (HTML command) Narrow-Band Secure Voice (system) 1. Network Computer (Sun Microsystems) 2. Network Control 3. Numerical Control system 4. Normally Closed (relay or switch contacts) 5. No Connection (diagrams) Network Construction and Administration 1. Number of Calls Abandoned 2. National Convergence Alliance (U.S.A.) Negative Cache National Center for Atmospheric Research Non-Call-path Associated Signaling Network Control Block (networking) New Commercial Billing System 1. Network Control Center (Inmarsat) 2. Network Color Code (GSM) 3. National Coordination Committee 4. National Communications Committee 5. National Computer Conference Network Communications Control Facility (IBM SNA)

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Nn

NCCS NCD NCE NCEO NCH NCHD NCHPC NCI NCIA NCITS NCL NCMS NCO NCOP NCP

NCPS NCRA NCS

NCSA NCSANet NCSC NCTA NCTE NCU NCUG NDA NDAC NDC

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223

Network Control Center System Non-linear Control Design Nomadic Computing Environment (PC standard) Non-Compliant End Ofﬁce Number of Calls Handled National Customer Help Desk National Consortium for High-Performance Computing Network Channel Interface Native Client Interface Architecture (Cisco) National Committee for Information Technology Standardization Network Control Language (programming) National Center for Manufacturing Sciences 1. National Coordination Ofﬁce 2. Neutral Central Ofﬁce 3. Numerically Controlled Oscillator Network Code Of Practice 1. NetWare Core Protocol (networking) 2. Network Control Protocols (Internet) 3. Network Control Point (AT&T) 4. Network Control Program (IBM SNA) 5. Network Conﬁguration Process (Northern Telecom) National Customer Product Support National Cellular Resellers Association (U.S.A.) 1. Network Coordination Station (Inmarsat) 2. Network Control System 3. Network-based Call Signaling 4. Network Computing System 5. National Communications System (U.S.A.) 1. National Center for Supercomputing Applications (U.S.A.) 2. National Computer Security Associations National Center for Supercomputing Applications Network 1. National Computer Security Center (U.S.A.) 2. National Communications Security Center (U.S.A.) National Cable Television Association (U.S.A.) Network Channel-Terminating Equipment Node Control Unit National Centrex Users Group 1. Non-Disclosure Agreement (contracts) 2. National Directory Assistance National Database Administration Center National Destination Code (ISDN number)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

NDCDB NDCS NDD NDDS NDE NDF NDIR NDIS NDLO-CIS NDM NDMP NDN NDO NDOD NDP NDR NDRO NDS NDSF NDT NDVD NDVI Nd-YAG NE NE&I NEAP NEAR NEARNet NEBE NEBS NEC NECA NECP

National Digital Cartographic Database 1. Network Data Control Station 2. Network Data Control System NetWare Directory Database (networking) Network Data-Delivery Service Network Design Engineering New Data Flag (MUX) Non-Dispersive Infrared 1. Network Driver Interface Speciﬁcation (networking) 2. Network Design Interface Speciﬁcation (networking) Norwegian Defense Logistic Organization—Communications and Information Systems Network Data Mover Network Data Management Protocol Non-Delivery Notiﬁcation (Inmarsat) Network Design Order Near-Data-On-Demand (service) Neighbor Discovery Protocol (new Internet) 1. Non-Destructive Readout (memory) 2. News Datacom Research, Ltd 3. Negative Differential Resistance (transistor) Non-Destructive Read-Out (memory) 1. Network Desired State 2. NetWare Directory Services (networking) Non-Dispersion Shifted Fiber No Dial Tone Non-Determination in Deductive Databases Normalized Difference Vegetation Index (remote sensing) Neodymium-doped Yttrium–Aluminum Garnet (laser) Network Element (MUX) Network Engineering and Implementation Novell Education Academic Partner (e-learning) Near-Earth Asteroid Rendezvous Spacecraft New England Academic and Research Network Near-End Block Error Network Equipment Building Standard (Telcordia Technologies) 1. Nippon Electric Company (Japan) 2. National Electric Code (U.S.A.) National Exchange Carrier Association (standards organization) Network Element Control Protocol

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Nn

NECTAR NECTAS NEDA NEDT NEF Negatron NEI NEL NEM NEMA NEMAS NEMKO NEMO NEMP NEMS NENA NEP NEPA NES NESC NESDIS NET

NetPOP NetBEUI NetBIOS NetBSD NetBT netcast NETCOM NETCONSTA NETDDE NETI NETIPC netiquette netizen NETOPS

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225

Network for Effective Collaboration Through Advanced Research Network Equipment Craft Terminal Application Software National Electronics Distributors Association Noise-Equivalent Differential Temperature (electronics) Network Element Function (MUX) Negative electron Network Entity Identiﬁer (cellular network) Network Element Layer Network Element Management (MUX) National Electrical Manufacturers Association Network Management and Administration System Norges Elektriske Material Kontroll (Norway) Not Emanating from Main Ofﬁce (broadcasting) Nuclear Electromagnetic Pulse Network Element Managment Server National Emergency Numbering Association (U.S.A.) Noise Equivalent Power (electronics) National Environment Policy Act Noise Equivalent Signal National Electrical Safety Code (IEEE) National Environmental Satellite, Data, and Information Service 1. Internet 2. network 3. Network Equipment Technologies, Inc. 4. Normes Europe´enne de Te´le´communications Network Point Of Presence NetBIOS Extended User Interface (networking) Network BIOS (networking) A free version of BSD UNIX operating system NetBIOS over TPC/IP A broadcast by using the Internet 1. Network Enterprise Technology Command (U.S. Army) 2. Network Command (information systems) Network Control Station Network Dynamic Data Exchange (Windows feature) Network Information Table Network Interprocess Communications network etiquette network citizen Network Operations System

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

NetWare SFT NEU .newsr NEXT nF NF NFA NFAR NFAS NFB NFCB NFM NFOEC NFPA NFR NFS NFSP NFT NGA NGDC NGDLC NGFL NGI NGIN NGN NGNP NGOSS NGP NGSO NGSO-FSS NGT nH NH NHAP NHK NHRP NHS NI

NetWare System Fault Tolerance (networking) Network Extension Unit (AT&T) Name extension for UNIX-based news readers ﬁles (computer) Near-End Cross-Talk (cables) nanofarad (electronics) Noise Figure (satcom) Noiseless Feedback Ampliﬁer Network File Access Routine Non-Facility Associated Signaling (ISDN) No-Fuse Circuit-Breaker National Federation of Community Broadcasters (U.S.A.) 1. Network Fault Management (Motorola) 2. Noise Figure Meter National Fiber Optic Engineers Conference National File Protection Association (U.S.A.) Normal Frequency Reference unit 1. Network File Server 2. Network File System (Unix standard) NetWare File Service Protocol Network File Transfer Noise Gain Analyzer National Geographical Data Center Next Generation Digital Loop Carrier National Grid For Learning (e-learning) Next Generation Internet Next Generation Intelligent Network Next Generation Network Non-Geographic Number Portability New Generation Operating System and Software Network Group Non-Geostationary Orbit (satellites) Non-Geostationary Orbit—Fixed Satellite Service (ITU) New Generation Transceiver nanohenry (electronics) National Host National High-Altitude Photography Nippon Hose Kyokai (Japanese broadcaster) Next Hop Routing Protocol (IETF) Next Hop Server 1. Network Interface 2. Network Implementation 3. National ISDN

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NI-1 NI-2 NI-3 NIA NIC

NiCAD NICAM NiCd NICE NICI NICS NICT NICTA NID NIDS NIF NIH NII NIM NIMA NIMBY NiMH NIMS NIOD NIPO NIS NISP NIST NIT NITF NIU NIUF

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227

National ISDN-1 National ISDN-2 National ISDN-3 Network Interface Adapter (IBM) 1. Network Interface Card (networking) 2. Network Information Center 3. Network Interface Controller 4. National ISDN Council 5. Near-Instantaneous Companding Nickel–Cadmium (battery) Near-Instantaneous Companded Audio Multiplex Nickel–Cadmium (battery) Network Information and Control Exchange National Information and Communications Infrastructure (Africa) NATO Integrated Communications System National Institute of Information and Communications Technology (Japan) National Iranian ICT Agenda (locally known as TAKFA) 1. Network Inward Dialing (feature) 2. Network Interface Device 3. Network Information Database Network Intrusion Detection System Network Interface Function National Information Highway National Information Infrastructure 1. Network Interface Module (standard) 2. National Instrumentation Module (standard) National Imagery Mapping Agency “Not In My Back Yard” (cellular networks) Nickel-Metal-Hydride (battery) Network Information Management System Network Inward/Outward Dialing Negative-Input Positive-Output (digital electronics) 1. Network Information Services (UNIX systems) 2. Network Imaging Server 3. NATO Identiﬁcation System National ISP (Internet Service Provider) National Institute of Standards and Technology (U.S.A.) Network Information Table (broadcasting) National Image Transfer Format Network Interface Unit North American ISDN Users’ Forum (standards organization)

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NIVT NJE NL NLA NLANR NLDC NLDM NLES NLETS NLM NLO NLOS NLP NLPI NLPID NLQ NLS NLSP nm NM NMA NMAA NMACS NMAR NMB NMC NMCC NMCCC NMCM NMCN NMEA NMF

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Network Integration Veriﬁcation Test Network Job Entry (IBM) 1. New Line (control character) 2. Network Layer Network Layer Address (LAN packet) National Laboratory for Applied Network Research (U.S.A.) Non-Linear Directional Coupler Network Logical Data Manager (IBM) Navigational Land Earth Station National Law Enforcement Telecommunication System NetWare Loadable Module (networking) Non-Linear Optical material Non-Line-Of-Sight (transmission) 1. Neuro-Linguistic Programming 2. Natural Language Processing (language recognition) 3. Network Layer Packet Network Layer Protocol Identiﬁer (LANs) Network Layer Protocol ID Near-Letter-Quality (printers) 1. Name Lookup Service 2. Natural-Language Support (voice recognition) 3. Non-Linear Schrodinger (equation) NetWare Link Services Protocol (networking) nanometer Network Management 1. Network Management Architecture 2. Network Monitoring and Analysis system National Multimedia Association of America Network Monitor And Control System Network Management and Access Routine Network Memory Bus 1. Network Management Center 2. Network Monitoring and Control 3. Non-Metallic Sheathed Cable Network Management Control Center (networking) Network Management Command and Control Center Network Management Communications Manager Network Management Communications Network National Maritime Electronics Association 1. Network Management Forum (standards organization) 2. Network Management Function

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Nn

NMI NML NMM NMOS NMP NMPA NMR NMRR NMS NMSE NMSI NMT NMTC NMU NMVT NN NNBS NNC NNCDE NNCNA NNCSE NNCSS NNG NNI

NNM NNMC NNS NNSC NNSS NNTM NNTP NNX

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1. Non-Maskable Interrupt (PC chat) 2. Network Management Interface Network Management Layer (TMN) Network Management Module N-channel MOS (semiconductors) 1. Network Management Processor (AT&T) 2. Network Management Protocol (networking) National Music Publishers’ Association Nuclear Magnetic Resonance (microwave) Normal-Mode Rejection Ratio 1. NetWare Management System (networking) 2. Network Management System 1. Network Management System Engineering 2. Normalized Mean Square Error National Mobile Station Identiﬁcation number Nordic Mobile Telephone system (Nordic Countries) National Mobile Telecommunications Company (Kuwait) 1. Network Management Unit 2. Noise Measurement Unit Network Management Vector Transport 1. National Network 2. National Number 3. Network Node NetView Network Billing System Neural Network Council (IEEE) Nortel Networks Certiﬁed Design Expert Nortel Networks Certiﬁed Network Architecture Nortel Networks Certiﬁed Support Expert Nortel Networks Certiﬁed Support Specialist National Number Group 1. Network Node Interface (MUX) 2. Network-to-Network Interface (ATM) 3. Neural Notwork Interface 4. Nearest Neighbor Interpolation (remote sensing) National Network Management National Network Management Center (TPC/IP) 1. National Network Support 2. Network Node System National Network Surveillance Center Navy Navigational Satellite System National Network Trouble Management Network News Transfer Protocol (TPC/IP) Network Numbering Exchange

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

NO NOAA NOBIS NOC NOCC NOCTAS NOD NODS NOH NOI NOIS NOF NOMDA Non-Div Non-GSO NO-OP NOP NOPS NOR Gate NORC NRE NORM NOS NOSC NOST NOTAM NOTHS NOV Novin 3Com Np NP NP&D NP0 NPA

1. Network Object 2. Normally Open (relay or switch contacts) National Oceanic and Atmospheric Administration (satellite) Network Operations Business Information System Network Operations Center (Inmarsat) Network Operations Control Center Network Ofﬁce Craft Terminal Application Software Network Outward Dialing (feature) Near Obstacle Detection System Network Operations Handbook (Inmarsat) Notice Of Inquiry (FCC) Netscape, Oracle, IBM, and Sun Microsystems (Microsoft) Network Operator Facility National Ofﬁce Machine Dealers Association Non-Diversity Non-Geostationary Orbit (satellites) No-Operation (instruction) Network Operations Protocol New Order Processing System A combination of a NOT and an OR Gate (digital electronics) Network Operations Research Committee Non-Recurring Engineering Nack-Oriented Reliable Multicast Network Operating System (LAN software) Naval Ocean Surveillance Center NASA Ofﬁce of Standards and Technology Notice to Airmen (COMSAR) Network Operations Trouble Handling System News Overview Novin Comprehensive Communication Company (Iran) Neper (unit of ratio of two voltages, two currents, or two power values in a logarithmic manner) 1. Number Portability 2. Negative–Positive (semiconductors) Network Planning and Design Negative–Positive-Zero (materials) 1. Numbering Plan Area (Bell) 2. Network Performance Analyzer (IBM) 3. Network Professionals Association (U.S.A.) 4. National Pricing Agreement (AT&T)

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Nn

NPAC NPBA NPC NPD NPDA NPDN NPDU NPI NPL NPM NPN NPNP NPO NPR NPRM NPS NPSI NPSP NPSTC NPU NQR NR NRAM NRC NRCE NRD NRDA NREN NRI

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1. Number Portability Administration Center 2. Number Portability Access Center National Public Broadcasting Archives (Maryland University) 1. Network Parameter Control 2. Network Processing Card 1. Network Protection Device (PBX) 2. Noise Power Density Network Problem Determination Application (IBM) Nordic Public Data Network Network Protocol Data Unit 1. Network Product Implementation 2. Not Plugged In 3. Null Pointer Indicator (MUX) Network Planning 1. Non-Penetrating Mount 2. Network Process Monitor 1. Negative–Positive–Negative (semiconductors) 2. Network Provider Network Negative–Positive–Negative–Positive (semiconductors) Network Performance Objectives 1. National Public Radio 2. Noise Power Ratio 3. New Product Return (number) Notice of Proposed Rule Making (regulatory) 1. Network Product Support 2. Number Portability Surcharge NCP Packet Switching Interface (X.25) Network Products and Systems Planning National Public Safety Telecommunications Council Numeric Processing Unit Nuclear Quadruple Resonance 1. Number (Morse code transmissions) 2. Nyquist Rate Non-volatile RAM (memory) 1. Non-Recurring Charge 2. National Research Council (U.S.A.) 3. Network Reliability Council Non-Redundant Common Equipment Network Reconciliation Descriptor National Routing and Database Administration National Research and Education Network (e-learning) Net Radio Interface

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

NRIC NRM NRMS NRS NRSC NRT NRTC NRTL NRUG NRZ NRZ-1 NRZ-C NRZ-I NRZ-L NRZ-M NRZ-S NS-CPE NSA NSAI NSAP NSAPI NSB NSC NSCAT NSCP NSDETP NSDI NSDP NSDP-B&S NSDP-F NSDU NSE NSE/OES

Network Reliability and Interoperability Council (FCC) 1. Normal Response Mode (HDLC) 2. Network Resource Manager Network Reference and Monitor Station 1. Network Routing System 2. National Relay Service 3. Network Reconﬁguration System National Radio Systems Committee Near-Real-Time National Rural Telecommunication Cooperative Nationally Recognized Test Laboratory National Rolm User Group Non-Return-to-Zero level (data encoding) Non-Return-to-Zero level, one (data encoding) Non-Return-to-Zero level, Change (data encoding) Non-Return-to-Zero level, Inverted (data encoding) Non-Return-to-Zero, Level (data encoding) Non-Return-to-Zero, Mark (data encoding) Non-Return-to-Zero, Space (data encoding) Non-Standard Customer Premise Equipment 1. National Security Agency 2. Network Service Address 3. Normalized Site Attenuation (microwave) National Standards Authority of Ireland Network Service Access Point (OSI model) Netscape Server Application Programming Interface National Science Board 1. Network Service Center 2. Non-Standard Command NASA Scatterometer (remote sensing) National Scalable Cluster Project Network System Development Electronic Transaction Processing National Spatial Data Infrastructure (U.S.A.) Non-Signaling Data Protocol Non-Signaling Data Protocol for Billing and Settlements Non-Signaling Data Protocol for Fraud Network Service Data Unit (OSI model) 1. Network Support Element (networking) 2. Network Surveillance Engineer 3. Network System Engineer Network Support Element and Operations Evaluation System

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Nn

nsec NSESS NSF NSFNet NSG NSI NSIC NSIE NSIF NSInet NSLOOKUP NSMD NSN NSO NSOM NSP

NSPE NSPIXP NSR NSS

NSSN NSTAC NSTS NSU NT

NT1

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233

nanosecond Network Systems Engineering Systems Support 1. National Science Foundation 2. Network Speciﬁc Facilities National Science Foundation’s Network National Systems Group Network Solutions, Inc. National Storage Industry Consortium Network Security Information Exchange Network and Services Integration Forum (ATIS) NASA Science Internet Name Server Lookup Non-Solder Mask Deﬁned Network Service Node 1. National Standards Organization 2. National Services Organization 3. National Switch Operations Near-ﬁeld Scanning Optical Microscopy 1. Network Service Provider 2. Network Service Protocol 3. Network Service Point 4. Network Supervisory Processor 5. Native Signal Processing National Society of Professional Engineers Network Service Provider Internet Exchange Point 1. Network Status Record 2. Non-Source Routed 3. Nyquist Sampling Rate 1. Network and Switching Subsystem (PLMN) 2. Network Status Subsystem 3. Network Support System 4. Network Software Support 5. National Standards System (Canada) 6. Non-Standard Setup (command) National Standard System Network National Security Telecommunications Advisory Committee Network Systems Technical Support Network Synchronization Unit 1. Northern Telecom 2. Network Terminal (ISDN) 3. New Technology (Windows NT) 4. Windows New Technology Network Terminator type 1 (ISDN)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

NT2 NTACS NTAS NTB NTC

NTCA NTDPC NTDS NTE NTELOS NTF NTFS NTI NTIA NTIS NTL NTM NTN NTO NTP NTS NTSC NTSC STD NTT NTTC NTU NTV

Network Terminator type 2 Narrow TACS (cellular networks) 1. Network Trafﬁc Analysis System 2. Windows NT Advanced Server Net-Top-Box (PC) 1. National Telecommunications Commission (Thailand) 2. National Telecoms Corporation (Sudan) 3. Negative Temperature Coefﬁcient (thermistors) National Telephone Cooperative Association National Telecommunications Damage Prevention Council (U.S.A.) 1. Naval Tactical Data System 2. National Television Design Standards 1. Network Termination Equipment (BT) 2. Network Transmission Elements NetView Trafﬁc Engineering Line Optimization System No Trouble Found New Technology File System (Windows NT) Network Terminating Interface Network Telecommunications and Information Administration National Technical Information Service Technology Administration (U.S.A.) National Transcommunications, Ltd. 1. Network Trafﬁc Management (Telcordia Technologies) 2. Notice To Mariners (shipping) Network Terminal Number (X.25) Network Terminal Option (IBM) 1. Network Time Protocol (TCP/IP) 2. Network Termination Point 1. Network Test System 2. Number Translation Services 3. Non-Trafﬁc Sensitive National Television Standards Committee (TV broadcast format) NTSC Standard (TV broadcasting) Nippon Telegraph and Telephone Corporation ( Japan) National Transportable Telecommunications Capability (comsat) Network Terminating Unit Non-linear Thickness Variation (IC wafer)

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Nn

NU NUA NuBus NUDET nudome NUI NUID NUL NUMA nV NV NVI NVIS NVLAP NVM NVoD NVP NVRAM NVS NVT nW NWADMIN NWAT NWDM NWL NWRA NWS NXX NYIIX NYNEX NZCS NZDSF NZSA NZWDF

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1. Network Unit 2. Network Unavailable Network User Address New Bus Nuclear Detonation Evaluation Technique nuclear radome (nuclear radiations) 1. NetWare Users International (networking) 2. Network User Identiﬁer Network User Identiﬁcation “NULL” (character control code) Non-Uniform Memory Access (architecture) nanovolt (electronics) Network Video Normalized Vegetation Index (remote sensing) Near-Vertical Incident Skywave National Voluntary Laboratory Accreditation Program Non-Volatile Memory Near-Video-on-Demand (service) Network Voice Protocol (ARPANet) Non-Volatile RAM (memory) Non-Volatile Storage Novell Virtual Terminals (Novell NetWare) nanowatt (electronics) NetWare Administrator (Novell NetWare) New Wireline Access Technology Narrow-Wavelength-Division Multiplexing Non-Wireline (cellular networks) National Wireless Resellers Association (U.S.A.) Network Services identiﬁes the central ofﬁce exchange allocated within the NPAs New York International Internet Exchange New York New England Exchange (AT&T) New Zealand Computer Society Non-Zero Dispersion Shifted Fiber New Zealand Software Association New Zealand Wireless Data Forum

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N

Oo O&M O-ADM O-band O-QPSK O/E O/P O/R OA OA&M OAA OACSU OAD OADM OAI OAM OAM&P OAMS OAMT

Operations and Maintenance Optical Add-Drop Multiplexer (MUX) Optical Frequency wavelength ranging from 1260 to 1310 nm Offset Quadrature Phase Shift Keying (modulation) Optical-to-Electric converter output Originator and Recipient (X.400) 1. Ofﬁce Automation 2. Optical Ampliﬁer Operations, Administration and Maintenance Open Avionics Architecture Off-Air Call Setup (GSM) Optical Admittance Diagram Optical Add-Drop Multiplexer (MUX) Open Application Interface 1. Off-Air Monitoring 2. Operations, Administration, and Maintenance 3. Operations and Maintenance Operations, Administration, Maintenance and Provisioning Operation Alarms and Measurement System Operations, Administration and Maintenance Terminal 237

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OAN OAO OAs OATS OAU OB OBC OBCS OBE OBF OBI OBL OBN OBO OBP OBS

OBSAI OBU OBWR OC OC-1 OC-3 OC-12 OCA OCB OCC OCDMA OCE OCG OCH OCIR OCL OCN OCO

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Optical Access Node Orbiting Astronomical Observatory Operations Applications (AINs) Open Area Test Site Operator Access Unit Outside Broadcasting (Intelsat) On-Board Computer On-Board Communications Station Out-of-Band Emission (Intelsat) Ordering and Billing Forum 1. Open Buying on the Internet Consortium (standards) 2. Omni-Bearing Indicator (instrument) Local Loop Operator of France Out-of-Band Noise (Intelsat) Output Back-Off On-Board Processing (Intelsat) 1. Outdoor Base Station 2. Out-of-Band Signaling 3. Optical Burst Switching 4. Omni-Bearing Selector (instrument) Open Base Station Architecture Initiative On-Board Unit On-Board Waveform Regenerator (Intelsat) 1. Optical Carrier 2. Open Circuit 3. Open Collector (circuits) Optical Carrier level-1 Optical Carrier level-3 Optical Carrier level-12 Optical Channel Analyzer Oil Circuit-Breaker 1. Operations Control Center (Inmarsat and Intelsat) 2. Other Common Carrier (Intelsat) 3. Optical Cross-Connect (MUX) Optical CDMA (access) 1. Open Collaboration Environment (Macintosh) 2. On-Call Engineer (Intelsat) Operational Coordination Group (ETSI) Optical Channel Overcoat Incident Recording Ofﬁce Code Location Operating Company Number Oven Controlled Oscillator

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Oo

OCP OCPAR OCR OCRI OCS OCT OCTS OCU OCUDP OCVCXO OCW OCXO OCX OD ODA ODAPS ODAS ODB ODBC ODBMG ODC ODF ODI ODIF ODIN ODINSUP ODIS ODLC ODMG ODP ODR ODSI

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1. Operator Control Panel 2. Optical Control Plane (Cisco) Optically-Controlled Phase-Array Radar 1. Optical Character Recognition (scanners) 2. Optical Character Reader (scanners) 3. Outgoing Call Restriction Ottawa Center for Research and Innovation (Canada) On-board Communications Station Ofﬁce Craft Terminal Ocean Color and Temperature Scanner (remote sensing) Orderwire Control Unit Ofﬁce Channel Unit Data Port Oven-Controlled/Voltage-Controlled Crystal Oscillator 1. OpenCourseWare (ICT) 2. Oscillator Control Word Oven-Controlled Crystal Oscillator OLE Custom Control 1. Optical Density 2. Optical Demultiplexer 1. Ofﬁce Document Architecture (ISO) 2. Object Deﬁnition Alliance (Oracle) Oceanic Display and Planning System Ocean Data Acquisition Systems (UNESCO) 1. Operator Determined Barring (GSM) 2. Open Dual Bus Open Data-Base Connectivity Object Data-Base Management Group Open Development Consortium Optical Distribution Frame 1. Open Data-Link Interface (networking) 2. Operational Data Integrator (MCI) Ofﬁce Document Interchange Format Optical Digital Integrated Network Open Data-link Interface/Network Support (networking) Oceanographic Data Interrogating Station Optimum Data-Link Control (protocol) Object Database Management Group 1. Open Distributed Processing 2. Optical Distribution Point Optical Document Recognition Open Directory Services Interface

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ODTR ODU O/E Oe OE OEIC OEL OELR OEM OEO OES OF OFA OFBG OFC OFCP OFCR OFDM OFDMA OFHC OFM OFN OFNP OFNR OFR OFS OFSCFC OFTA OFTEL OFX OGM OGT OH OHA OHB

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Ofﬁce of the Director of Telecommunications Regulation (Ireland) Out-Door Unit (VSAT) Optical-to-Electrical (converter) Oersted (magnetic ﬁeld strength) Ofﬁce Equipment Opto-Electronic Integrated Circuit Organic Electro luminescent (display technology) Overall Echo Loudness Rating Original Equipment Manufacturer (products) Optical-to-Electrical-to-Optical regeneration Operations Evaluation System (MCI) Optical Fiber Optical Fiber Ampliﬁer Optical Fiber Bragg Grating 1. Open Financial Connectivity (interface) 2. Optical Fiber Cable Optical Fiber Conductive Plenum Optical Fiber Conductive Riser Orthogonal Frequency Division Multiplexing (transmission) Orthogonal Frequency Division Multiple Access Oxygen-Free High-Conductivity (copper wire) Operational Fixed Microwave 1. Optical Fiber Network 2. Optical Fiber Non-conductive 1. Optical Fiber Non-conductive Plenum 2. Optical Fiber Network Plenum 1. Optical Fiber Non-conductive Riser 2. Optical Fiber Network Riser Ofﬁce of the Federal Register (U.S.A.) 1. Operational Fixed Service 2. Out-of-Frame Seconds (MUX) Optical Fiber Cable and Solar Cell Fabrication Company (Iran) Ofﬁce of the Telecommunications Authority (Hong Kong) The Ofﬁce of Telecommunications (U.K.) Open Financial Exchange Out-Going Message Out-Going Trunk overhead (MUX) Overhead Access (MUX) Overhead Byte (MUX)

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Oo

OHD OHG OHI OHQ OHR OHVA OIC OICETS OID OIDA OIF OIR OJT OK-QPSK OLA OLAP OLC OLE OLEC OLED OLI OLIU OLNS OLO OLOS OLR OLRU OLS OLT OLTC OLTE OLTP OLTS OLTU

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241

Optical Hard Drive Operators Harmonization Group (cellular networks) 1. Overhead Interface 2. One-Horn Interferometer Off-Hook Queue 1. Optical Handwriting Recognition 2. Overhead Router Off-Hook Voice Announce Optical Integrated Circuit Optical Inter-orbit Communications Engineering Test Satellite 1. Originating ID 2. Object Identiﬁer Optoelectronics Industry Development Association Optical Interworking Forum Online Insertion and Removal (equipment components) On-the-Job Training Offset-Keyed QPSK (modulation) 1. Open-Library Architecture 2. Optical Line Ampliﬁer On-Line Analytical Processing (ICT) Optical Loop Carrier Object Linking and Embedding (software technology) Originating Local Exchange Carrier Organic Light-Emitting Diode (display technology) Optical Loop Interface Optical Line Interface Unit Originating Line Number Screening Other Licensed Operators Obstructed-Line-Of-Sight (transmission) Outgoing Longwave Radiance (remote sensing) Optical Line Regenerating Unit 1. Originating Line Screening 2. On-Line Services 3. Optical-Label Switching (networking) Optical Line Terminal Optical Line Terminal Controller Optical Line Terminal Equipment On-Line Transaction Processing (ICT) Optical Loss Test Set Optical Line Terminal Unit

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

OM

OM-1 OMA OMAB OMAN OmanTel OMAP OMAT OMC OMC-Env OMC-IN OMC-M OMC-Misc OMC-R OMC-S OMC-T OMC-WAN OMF OMG OMI OMJ OML OMP OMR OMS OMT OMUX ONA ONAC ONAL ONC ONI ONMS ONP

1. Operational Measurement 2. Old Man or radio ofﬁcer of ship (Morse code transmissions) 3. Optical Multiplexer Open MPEG Consortium 1. Object Management Architecture 2. Open Mobile Alliance Object Management Architecture Board Optical Metropolitan Area Network Oman Telecommunications Company (operator) 1. Open Multimedia Applications Protocol (Texas Instruments) 2. Operations and Maintenance Applications Part Operational Measurement and Analysis Tool Operations and Maintenance Center Operations and Maintenance Center for Environment Operations and Maintenance Center for Intelligent Network Operations and Maintenance Center for Mobile Operations and Maintenance Center for Miscellaneous purposes Operations and Maintenance Center for Radio Operations and Maintenance Center for Switching Operations and Maintenance Center for Transmission Operations and Maintenance Center for Wide Area Network Open Model Forum Object Management Group (U.S. software standards) Open Microprocessor Initiative (European) Ortho-Mode Junction Operations and Maintenance Link (GSM) Optimized Multipath (routing service) Optical Mark Recognition (scanners) Operations and Maintenance Station Orthogonal-Mode Transducer Output Multiplexer Open Network Architecture (Bell packet networks) Operations Network Administration Center Off-Network Access Line Open Network Computing 1. Optical Network Interface 2. Operator Number Identiﬁcation Open Network Management System Open Network Provision

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Oo

ONPT ONT ONTC ONU OO OOCM OODB OOF OOK OOO OOP OOPS OOR OORE OOS OOT OP opamp OPAC OPB OPBO OPC opcode opcom OPDAR OpenGL Opeval Opex OPGW OPIP OPL OPLL opm OP MODEL OPP OPPV

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Ofﬁce Nationale des Postes des Telecommunications (Morocco) 1. Open Network Terminal 2. Optical Network Tester 3. Ofﬁce National de Te´le´diffusion (Morocco) Open Networks Technology Consortium Optical Network Unit Object-Oriented Object-Oriented Call Model Object-Oriented Data-Base 1. Out-Of-Frame (transmission) 2. Out-Of-Franchise On–Off Keying (modulation) 1. Optical-to-Optical-to-Optical regeneration 2. Optical-Oriented Operation (TMN) Object-Oriented Programming Open Outsourcing Policy Services (IETF) Out Of Region Operations Order Review Out Of Service Object-Oriented Technology (software) operator (Morse code transmissions) operational ampliﬁer 1. Outside Plant Access Cabinet 2. Online Public Access Catalog (ICT) Optical Power Budget Output Power Back-Off 1. Originating Point Code (SS7) 2. On-Premises Cabling 3. Optical Phase Conjugator operation code optical communication Optical radar Open Graphics Language (Silicon Graphics) Operational evaluation Operations expenditures Optical Ground Wire Output Power Intercept Point (microwave) Optical Path Length Optical Phase-Locked Loop operations per minute Operations Model Object Push Proﬁle (Bluetooth) Order-ahead Pay Per View (pay TV)

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O

244

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

Ops OPS

OPSEC OPSEC-A OPSEC-S Opt OPSK OPTIS Optisolator OPW OPX OQPSK OR

ORB ORBCOMM ORDIG ORM ORPTR ORR ORS ORSA ORU OS OS/2 OSA OSC OSCAR OSD OSDM

operations 1. Off-Premises Station 2. Open Proﬁling Standard 3. Optical Sensor 4. Operator Services Operational Security Operational Security Assessment Operational Security Survey optional Octal PSK (modulation) Overlapped Phase Trellis-code Interlocked Spectrum optically coupled isolator On-Premises Wiring Off-Premises Extension (PBX adapter) Offset Quadrature PSK (modulation) 1. Off-Route (aeronautical mobile service) 2. Ocean Region 3. Operations Research 4. Optical Repeater 5. Outage Ratio 1. Object Request Broker (CORBA interface) 2. Ofﬁce Repeater Bay Orbital Communications Corporation (company) Open Regional Dialog on Internet Governance Optically Remote Module (AT&T) Optical Repeater Ocean Region Registration signal Omni-directional Range Station Operations Research and Systems Analysis Orbital Replacement Unit (remote sensing) 1. Operating System (computer) 2. Operator Services (telephony) 3. Optical Section Operating System version 2 (IBM) 1. Open System Architecture 2. Optical Spectrum Analyzer 3. Optical Society of America 1. oscillator 2. Out-band Signaling Channel 3. Optical Supervisory Channel Orbiting Satellite Carrying Amateur Radio On-Screen Display 1. Optical Spatial-Division Multiplexing 2. Optical Space-Division Multiplexing

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Oo

OSF OSF1 OSI OSI-TP OSI-RM OSI-SD OSI-SM OSIE OSINet OSJ OSMINE OSN OSNS OSP OSPF OSPFIGP OSPR OSPS OSR OSRI OSS OSS7 OSSI OSSN OSSP OST OSTA OSTP OSW OT OTA OTAM OTAR OTASP OTC

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1. Open Software Foundation 2. Operation Support Function Open Software Foundation version 1 Open Systems Interconnection (network architecture model) Open Systems Interconnection-Transport Protocol Open Systems Interconnection-Reference Model (ISO) Open Systems Interconnection-Service Deﬁnition Open Systems Interconnection-System Management Open Systems Interconnection-Environment (ISO) OSI Test Network Optical Society of Japan Operations Systems Modiﬁcations for the Integration of Network Elements Open Systems Networking Open Systems Network Support Operator Service Provider Open Shortest Path First (routing protocol) Open Shortest Path First Internet Gateway Protocol Optical Shared Protection Ring Operator Services Position System (AT&T) 1. Optical Solar Reﬂector 2. Over Sampling Ratio (ADC) Originating Station Routing Indicator 1. Operations Support Systems (TMN) 2. Operations Sub-Systems (GSM) 3. Operational Service State Operator Services Signaling System Number 7 Operations Support System Interface Originating Station Serial Number Object Serialization Stream Protocol Ofﬁce of Science and Technology Optical Storage Technology Association (U.S.A.) Ofﬁce of Science and Technology Policy Out-band Service Word 1. Ofﬁce of Telecommunications 2. Orascom Telecom (operator) 1. Ofﬁce of Technology Assessment (U.S.A.) 2. Orascom Telecom of Algeria 3. Over-The-Air activation of services Over-The-Air Management (HF network nodes) Over-The-Air Rekeying Over-The-Air Service Provisioning Operating Telephone Company

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O

246

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

OTDOA OTDR OTF OTGR OTH OTIA OTM OTN OTO OTP OTQ OTS OUI Outbox OutWATS OVD OVP OVPO OVS OVSF OVTG OW OWM OWS OWT OXC

Observed Time Difference of Arrival (GSM) Optical Time-Domain Reﬂectometer (test equipment) Optimum Transmission Frequency Operations Technology Generic Requirements Over-The-Horizon (microwave) Ofﬁce of Telecommunications and Information Applications Optical Translation Measurement 1. Optical Transport Network 2. Omam TradeNet One-Time-Only (memory) 1. Ofﬁce of Telecommunications Policy 2. Open Trading Protocol 3. One Time Programmable (memories) Outgoing Trunk Queuing 1. Operations Technical Support 2. Off-The-Shelf Organizationally Unique Identiﬁer (Ethernet) Outgoing mails box (e-mail) Outward Wide-Area Telephone Service 1. Optical Video Disk 2. Outside Vapor Deposition process (optical ﬁbers) Over-Voltage Protection (power) Outside Vapor Phase Oxidation process (optical ﬁbers) Open Video System Orthogonal Variable Spreading Factor Optical Virtual Tributary Group (SONET) Order-Wire (signaling circuit) Order-Wire Message 1. Operator Work station 2. Optical Wavelength Switch Operator Work Time Optical Cross-Connect

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Pp p P

P-band P-channel P-Code P-Frame P-MAC P-machine P-MOS P-P P-picture P-rating

Symbol for preﬁx pico-, denoting one-trillionth or 10K12 1. Symbol for preﬁx peta-, denoting 250 or 1015 2. Symbol for preﬁx pseudo-, denoting false or deceptive 3. Symbol for electrical permeance (electronics) 4. Symbol for power 5. Symbol for pound (unit of weight) 6. Symbol for positive (semiconductors) 7. Symbol for primary winding (circuit diagrams) 8. Symbol for plate (anode of electron tubes) Radar Frequency band ranging from 0.22 to 0.39 GHz (SAR) Packet-mode channel 1. Protected Code 2. Precise Code 3. Pseudo-Code Predictive Frame Packet Media Access Control Pseudo-machine P-channel MOS (semiconductors) Peak-to-Peak (alternating quantity) Predictive-coded picture Performance rating

247

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P

248

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

P region P-TMSI P/A P/E Ratio P/P P/S P1dB P1dBin P1dBout P2P P2MP P2T P3P P4 P5 P54C P55C P6 pA Pa PA

PA-RISC PA system PAA PABX PAC PAC-E PACA PACS PACT

Positive region or holes (semiconductors) Packet-Temporary Mobile Subscriber Identity Peak-to-Average (ratio) Price-to-Earnings Ratio Point-to-Point Parallel-to-Serial (converter) Power at one dB gain compression P1dB referenced to the input P1dB referenced to the output 1. Peer-to-Peer (networking) 2. Point-to-Point (networking) 3. Person-to-Person communication Point-to-Multipoint (networking) Push-to-Talk Platform for Privacy Preferences Project Photolithographic Pattern Plated Probe 586 Pentium Microprocessor (Intel) Ofﬁcial part number for Pentium processor (Intel) Ofﬁcial part number for Pentium processor with MMX (Intel) Pentium Pro Processor (Intel) picoampere (electronics) Symbol for Pascal unit (1 PaZ1 N/m2) 1. Pre-Assigned (access) 2. Preamble (FDDI) 3. Power Ampliﬁer (electronics) 4. Pooling Administrator Precision Architecture-Reduced Instruction Set Computing (Hewlett-Packard) Public Address system Phased-Array Antenna (microwave) Private Automatic Branch Exchange (switching) 1. Platform Azimuth Control 2. Perceptual Audio Coder Paciﬁc ocean region East (Inmarsat) 1. Priority Access and Channel Assignment 2. Paciﬁc and Asian Communication Association 3. Picture Agency Council of America Personal Access Communications System (U.S. version of PHS) 1. Public Access Cordless Telephony 2. PBX And Computer Testing (Siemens) 3. Personal Air Communications Technology

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Pp

PACVD PACX PAD

PAE PAG PAGEOS PagP PAIS PakTel PAL

PAL-M PALC PALI PALR PALSAR PalTel PAM PAM/FM PAMA PAMR PAMS PAN Panamsat PANI PANS PAP

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249

Plasma Activated Chemical Vapor Deposition (optical ﬁbers) Private Automatic Computer Exchange 1. Packet Assembler/Disassembler (X.25) 2. Personal Authentication Device 3. Program Associated Data (broadcasting) 4. Programmable Address Decoder Power-Added Efﬁciency Procedures Advisory Group Passive Geodetic Earth-Orbiting Satellite (NASA) Port aggregation Protocol (LANs) Path Alarm Indication Signal Pakistan Telecommunications company Ltd 1. Phase Alternation by Line (TV broadcast format) 2. Public Access Line 3. Paradox Application Language (programming) 4. Programmable Array Logic (digital electronics) 5. Proprietary Algorithm Phase Alternation by Line-Modiﬁed version (TV format) Plasma-Addressed Liquid Crystal (display) Pseudo-Automatic Location Identiﬁcation Precision Approach and Landing Radar (aviation) Phased Array type L-band Synthetic Aperture Radar Palestine Telecommunications Company 1. Pulse-Amplitude Modulation 2. Payload Assist Module (Intelsat) 3. Port Adapter Module (Cisco) Pulse-Amplitude Modulation on FrequencyModulation 1. Pre-Assigned Multiple Access (satcom) 2. Pulse Address Multiple Access (satcom) Public Access Mobile Radio (service) Perceptual Analysis Measurement System 1. Personal-Area Network 2. Public Access Network Pan-American Satellite Pseudo-Automatic Number Identiﬁcation Pretty Amazing New Service 1. Public Access Provider (Internet) 2. Public Access Proﬁle (DECT) 3. Plug-And-Play (computer hardware) 4. Pre-assignment Access Plan 5. Password Authentication Protocol 6. Printer Access Protocol (AppleTalk)

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P

250

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

PAR

paramp PARC PARD PARs PARS ParsTel PAS

PASC PASL PAT PATU PAX Payphone Pb Pbps PB

PBA PBC PBER PBGA PBGAM PBN PBNM PBO PBP PBS PBT

1. Positive Acknowledgement plus Retransmission 2. Precision Approach Radar 3. Packet-to-Average Ratio 4. Performance Analysis and Review parametric ampliﬁer Palo Alto Research Center (Xerox) Periodic And Random Deviation (power) Purchase of Accounts Receivables Playback And Recording System Pars Telephone company (Iran) 1. Public Address System 2. Personal Accountability System 3. Priority Access Service 4. Private Aircraft Station 5. Proﬁle Alignment System Perceptual Audio Sub-band Coding Primary Area Switch Locator 1. Port Address Translation (LANs) 2. Program Association Table Pan-African Telecommunication Union Private Automatic Exchange Pay Telephone system Petabit, equal to 1015 or 250 bits (transmission) Petabits per second 1. Petabyte, which is 250 or 1024 times terabytes (computer) 2. Plesiochronous Buffer 3. Primary Body (orbits) 1. Personalized Basic Service 2. Printed Board Assembly Polarization Beam Combiner (laser) Pseudo-Bit Error Ratio Plastic Ball-Grid Array (microchips) Plastic Ball-Grid Array Multilayer (microchips) Packet Backbone Network Policy-Based Network Management Polymorphic Buffer Overﬂow (Internet) Packet Burst Protocol (networking) 1. Personal Base Station (PCS) 2. Public Broadcasting Service 3. Polarization Beam Splitter 1. Push-Button Telephone 2. Polybutylene Terephthalate (optical ﬁbers)

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Pp

PBX pC PC PC

PC-AT PC-QFP PC-XT PCA

PCAS PCB

PCC

PCCA PCCH .pcd PCD PCF PCH PCI

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251

Private Branch Exchange (switching equipment) pico-Coulomb (electronics) Carrier Power (transmission) 1. Personal Computer (IBM) 2. Personal Communications 3. Programmable Controller 4. Power Control 5. Protocol Control 6. Printed Circuit 7. Primary Center (switching) 8. Primary Channel 9. Project Coordinator (AT&T) Personal Computer AT (IBM) Printed-Circuit Quad Flat Pack (microchips) Personal Computer XT (IBM) 1. Point of Closest Approach (satcom) 2. Protective Connecting Arrangement 3. Protective Coupling Arrangement 4. Protection Channel Access 5. Premises Cabling Association Personal Communications Access System (cellular) 1. Printed Circuit Board (electronics) 2. Power Control Box 3. Power Circuit Breaker 4. Process Control Block 5. Protocol Control Block 1. Product Control Center 2. Personal Companion Computer 3. Prepaid Calling Card (INs) 4. Plastic Chip Carrier Portable Computer and Communications Association (U.S.A.) Physical Control Channel Name extension for kodak Photo CD format ﬁles (graphics) Personal Communications Device 1. Physical Control Field (LANs) 2. Print Coordination Function Paging Channel (GSM) 1. Peripheral Component Interconnect (computer bus) 2. Peripheral Component Interface (computer bus) 3. Protocol Control Information (OSI model) 4. Pre-connection Inspection 5. Paya Communication Industries (Iran)

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P

252

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

PCI SIG PCI-X PCIA PCL PCLEC PCM PCM-IM PCM/FM PCM-30 PCMC PCMCIA PCMDI PCMIA PCN PCO PCOM PCP PCR

PCRA PCs PCS PCS-1900 PCSA PCSC PCSN PCSR .pct

PCI Special Interest Group Peripheral Component Interconnect-Extended (computer) Personal Communications Industry Association (U.S. standards) 1. Printer Control Language (Hewlett-Packard) 2. Product Computer-module Load Packet Competitive Local Exchange Carrier 1. Pulse-Code Modulation 2. Phase Conjugation Mirror 3. Process Control Monitor Pulse-Code Modulation—Intensity-Modulation Pulse-Code Modulation on Frequency-Modulation 2.048 Mbps T-1 (E-1) PCM Controller Personal Computer Memory-Card International Association PCM Drop Insert Personal Computer Manufacturer Interface Adapter Personal Communications Network 1. Public Call Ofﬁce 2. Point of Control and Observation 3. Private Cable Operator Private Communications 1. Predictor Compression Protocol 2. Private Carrier Paging 3. Post Call Processing 1. Peak Cell Rate (ATM) 2. Program Clock Reference (TV broadcast) 3. Phase Change Rewritable (memory) 4. Processor Conﬁguration Register Proportional Control Rate Algorithm (ATM) Personal Computers Personal Communications System (wireless and cellular) Personal Communications Systems operating at 1900 MHz Personal Computing System Architecture Palestine Commercial Services Company Private Circuit Switching Network Parallel Channel Signaling Rate Name extension for macintosh PICT format ﬁles (graphics)

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Pp

PCT PCTA PCTE PCTS PCU PCWG .pcx PD

PD-channel PDA PDAIA PDAS PDAU PDBM PDC

PDC-P PDCH PDD PDE PDEF .pdf PDF

PDG PDH

&

1. Personal Communications Technology 2. Portable Control Terminal (Mux tester) 3. Program Comprehension Tool (software) Personal Computer Terminal Adapter (ISDN) Portable Common Tool Environment Public Cordless Telephone Service (Canada) 1. Packet Control Unit (GPRS) 2. Peripheral Control Unit Personal Conferencing Work Group Name extension for PC Paintbrush image ﬁles (graphics) 1. Phase Detector 2. Photo-Detector 3. Photo-Diode 4. Pulsed Doppler (radar) 5. Pre-Distortion 6. Protocol Discriminator (GSM) 7. Product Distributor (Inmarsat) Packet-mode Data channel Personal Digital Assistant PDA Industry Association (U.S. standards organization) Product Document Archiving System Physical Delivery Access Unit Pulse-Delay Binary Modulation 1. Personal Digital Cellular system (Japan) 2. Personal Digital Cellular (standard) 3. Personal Digital Communications 4. Program Delivery Control (broadcasting) 5. Primary Domain Controller (Windows NT) Personal Digital Cellular-Packet technology Physical Data Channel 1. Post Dial Delay (phone calls) 2. Portable Digital Document (graphic ﬁle) Product Document Exchange Physical Design Exchange Format Name extension for PDF format Adobe ﬁles (computer) 1. Portable Document Format (ﬁles format) 2. Pulse Duty Factor (parameter) 3. Probability Distribution Function 4. Power Distribution Frame Program Data Generator (TV broadcast) Plesiochronous Digital Hierarchy (MUX)

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253

P

254

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

PDI

PDIAL PDIF PDIP PDL PDLC PDM

PDM/FM PDM/PM PDN

PDO PDP

PDPS PDR PDS

PDT PDTS

1. Picture Description Instructions 2. Personal Data Interchange (format) 3. Perspective Dark-ﬁeld Imaging (semiconductor wafer) Public-access Dial-up (Internet) P-CAD Data Interchange Format Plastic Dual Inline Package (microchips) 1. Page-Description Language (programming) 2. Positioning Data Link Polymer-Dispersed Liquid Crystal (display) 1. Pulse-Duration Modulation 2. Plain-Dress Message 3. Personal Data Module 4. Product Data Management Pulse-Duration Modulation on Frequency-Modulation Pulse-Duration Modulation on Pulse-Modulation 1. Packet Data Network 2. Public Data Network 3. Premises Distribution Network 4. Primary Directory Number (ISDN) 1. Packet Data Optimization 2. Portable Distributable Objects (computer) 1. Power Distribution Panel 2. Public Dispersion Parameter (optical ﬁbers) 3. Plasma Display Panel (television set) 4. Programmed Data Processor (Digital Equipment Corporation) 5. Packet Data Protocol (GPRS) Photographic Data Processing System Preliminary Design Review 1. Premises Distribution System (Lucent Technologies) 2. Primary Distribution System 3. Power Distribution System 4. Program Data Source 5. Protected Distribution System (U.S. federal government) 6. Payload Data Segment (satcom) 7. Processor Direct Slot (Macintosh) 8. Parallel Data Structure (computer) 1. Position Determination Technology 2. Programmable Data Terminal 3. Prototype Debug Tool (Tektronics) Public Data Transmission Service

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Pp

PDU PDUS PDV PE

PEAP PEB PEBB PEC PECC PECL PECVD PED PEDC PEEC PEEK PEG PEG Ratio PEL PEM PEP

PEPCI PER Perl PERT PES

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255

Protocol Data Unit (OSI model) Primary Data User Station Path Delay Value 1. Peripheral Equipment 2. Phase-Encoded (recording) 3. Processing Element 4. Protocol Emulator 5. Polyethylene (cable) Protected Extensible Authentication Protocol PCM Expansion Bus Power Electronic Building Block 1. Photo-Electric Cell (electronics) 2. Perfect Electrical Conductor Partially Error-Controlled Connections Positive Emitter-Coupled Logic (digital electronics) Plasma-Enhanced Chemical Vapor Deposition 1. pedestal (antenna) 2. Phase Error Detector Pan European Digital Communications (GSM) Partial Element Equivalent Circuit Partners Early Experience Kit (Taligent) Public Educational or Government access (cable TV) Price to Earning Growth Ratio Picture Element (pixel) 1. Privacy Enhanced Mail (Internet) 2. Peripheral Equipment Module 1. Packet Error Probability 2. Packet Ensemble Protocol 3. Packet Exchange Protocol 4. Payment Extension Protocol 5. Peak Envelope Power (electronics) 6. Policy Enforcement Point 7. Primary Entry Point 8. Partitioned Emulation Programming (IBM) Protocol for Exchange of Policy Information (IETF) 1. Packet Error Rate 2. Packet Encoding Rules Practical Extraction and Report Language (programming) Project Evaluation and Review Technique (ICT) 1. Personal Earth Station 2. Packetized Elementary Stream (MPEG) 3. Packet over Ethernet over SONET 4. Program Elementary Stream

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P

256

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

PESIS PESOS PESQ PET PEW pF PF

PF Xfer PFC PFD PFM PFN PFOC PG PGA PGBM PGD PgDn PGI PGL PGM PGP PGP fone PgUp PGS PG Telecom ph pH PH PHB PHEMT PHF PHI PHILCOM

Photo Electron Spectroscopy of Inner-Shell electrons Photo Electron Spectroscopy of Outer-Shell electrons Perceptual Evaluation of Speech Quality 1. Portable Earth Terminal 2. Positron-Emission Tomography (medicine) Packet over Ethernet over WDM picofarad (electronics) 1. Presentation Function (TMN) 2. Packing Fraction (ﬁber optics) 3. PBX Function 4. Power Factor (electronics) Power Failure Transfer (electronics) Power Factor Correction (PC power supply) 1. Power Flux-Density 2. Phase/Frequency Discriminator 1. Pulse-Frequency Modulation 2. Proto-Flight Model Pulse-Forming Network Pending the Firm Order Commitment 1. Pre-Group (MUX) 2. Power Gain 1. Pin-Grid Array (microchips) 2. Programmable Gain Ampliﬁer 3. Professional Graphics Adapter (IBM) Pulse-Gated Binary Modulation Professional Graphics Display (IBM) Page Down key (PC keyboard) Parameter Group Identiﬁer (ISO) Peer Group Leader Pragmatic General Multicast (Cisco) Pretty Good Privacy (encryption software) PGP Telephone Protocol Page Up key (PC keyboard) Primary Guard Station Payam Gostar Telecom Company (Iran) phot (unit of illumination) picohenry (electronics) Packet Handler (ISDN) Per-Hop-Behavior Pseudomorphic High-Electron Mobility Transistor (semiconductors) Packet Handling Function PBX-to-Host Interface Philippine Global Communications Inc.

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Pp

phone PHOTINT photocell phototube PHP PHS PHY PHz pi ﬁlter PI PIA PIAFS PIC

PICC PICH PICMG PICS

.pict PICT PID PIDB PIE PIECE PIF PILC

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257

1. telephone 2. headphone Photographic Intelligence photoelectric cell photoelectric tube Personal Handy-Phone (Japan) Personal Handyphone System (Japan) Physical layer (OSI model) Petahertz (1015 Hertz) p-shaped ﬁlter 1. Presentation Indicator 2. Parameter Identiﬁer (ISO) 3. Protection Interval 1. Personal Information Appliance 2. Peripheral Interface Adapter PHS Internet Access Forum Standard (Japan) 1. Primary Interexchange Carrier 2. Photonic Integrated Circuit 3. Plastic Insulated Conductor 4. Picture Image Compression (graphics) 5. Personal Intelligent Communicator 6. Programmable Interrupt Controller (computer) 7. Program Integration Control (TV broadcast) 8. Programmable Integrated Circuit (ICs) Primary Interexchange Carrier Charge Pilot Channel PCI Industrial Computer Manufacturers Group (U.S.A.) 1. Protocol Implementation Conformance Statement 2. Plug-in Inventory Control System 3. Product Inventory Control System 4. Platform for Internet Content Selection Name extension for PICT format image ﬁles (computer) Picture Format 1. Protocol Identiﬁer 2. Packet Identiﬁer Peripheral Interface Data Bus (AT&T) Personal Interactive Electronics Productivity, Information, Education, Creativity, Entertainment 1. Personal Communications Services Industry Forum 2. Public Inspection File 3. Program Information File (MS Windows) Performance Implication of Link Characteristics

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P

258

&

PILOT PIM

PiMF PIMP PIMS PIN

PIN(BB) PIN-FET PIN(UI) PIND PING PINT PINX PIO PIP PIRS PISD PIP .pit PIU PIV PIX Pixel PIXIT pJ PJ/NF PJCM PJCP PJE PJS

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Programmed Inquiry, Learning Or Teaching (e-learning) 1. Passive Intermodulation 2. Personal Information Manager (software) 3. Personal Information Management 4. Plug-in ISDN Module 5. Protocol-Independent Multicast (IETF) 6. Presence and Instant Messaging Parts in Metal Foil Passive Inter-Modulation Product Program Information Management System (TV broadcast) 1. Personal Identiﬁcation Number (GSM) 2. Positive-doped/Intrinsic/Negative-doped diode (semiconductors) 3. Public Infrastructure Network 4. Procedure Interrupt Negative (fax machine) 5. PN junction with Isolated region (sold state) PIN used on the Base-Band Level (bluetooth) PIN (diode) Field Effect Transistor (semiconductors) PIN used on the User Interface Level (bluetooth) Particle Impact Noise Detection 1. Packet Internet Gopher (software utility) 2. Process-Improvement Networking Group PSTN and Internet Interworking Private Integrated Network Exchange Programmed Input/Output (hard drives) Procedural Interface Protocol Positioning Inertial Reference System Planned In-Service Data 1. Picture In Picture 2. Path Independent Protocol Name extension for PackIT ﬁles (computer) Path Information Unit Peak Inverse Voltage (electronics) Private Internet Exchange (Cisco) Picture element Protocol Implementation extra Information for Testing picojoule (physics) Projection-Join Normal Form Pointer Justiﬁcation Count Minus (MUX) Pointer Justiﬁcation Count Plus (MUX) Pointer Justiﬁcation Event (MUX) Pointer Justiﬁcation Seconds (MUX)

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Pp

PKCS PKE PKES PKI PKM PKZIP PL PL/1 PL/M PLA PLAR PLB PLC

PLCC PLCP PLD PLDT PLF PLI PLL PLLC PLLN PLM

PLMN PLMR PLN PLO PLP PLR PLS

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259

Public-Key Cryptography Standards Public-Key Encryption Public-Key Encryption System Public-Key Infrastructure (ICT) Perigee Kick Motor (satellite) PKWARE, Inc.’s ZIP (data compression) 1. Private Line 2. Programming Language Programming Language 1 (IBM) 1. Programming Language for Microcomputers 2. Programming Language for Microprocessors Programmable Logic Array (digital electronics) Private Line Automatic Ringdown Personal Locator Beacon (COMSAR) 1. Programmable Logic Controller 2. Power Line Carrier 3. Problem Logging Control 4. Planar Lightwave Circuit Plastic Leaded-Chip Carrier method (chip mounting) Physical-Layer Convergence Procedure (networking) 1. Programmable Logic Device (digital electronics) 2. Phase Lock Detector 3. Pulsed Laser Deposition Philippine Long-Distance Telephone Polarization Loss Factor (microwave) Programmable Language Interface Phase-Locked Loop (electronics) Professional Limited Liability Corporation Public Leased Lines Network 1. Public Land Mobile (network) 2. Pulse-Length Modulation 3. Power-Line Modulation 4. Perfectly Matched Layer Public Land Mobile Network (cellular networks) Private Land Mobile Radio Private Line Network Phase-Locked Oscillator 1. Packet Layer Protocol 2. Packet Loss Probability 3. Packet Level Procedure (X.25) Pulse Link Repeater (signaling) 1. Physical Layer Signaling (network architecture) 2. Premises Lightwave System (ﬁber optic) 3. Programmable Logic Sequencer (digital electronics)

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P

260

&

PLSC PLT PLTS PLU PM

PMA PMARS PMB PMBS PMC PMCM PMD PMI PMMU PMOS PMP PMR PMRS PMS PMT

PMU PN

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Private Line Service Center Power Line Telephony Private Line Transport Service Percent Local Usage 1. Phase Modulation 2. Pulse Modulation 3. Processor Module 4. Packet Mode 5. Polarization Maintaining (optical ﬁber) 6. Preventive Maintenance 7. Performance Monitoring (MUX) 8. Permanent Magnet 9. Presentation Manager (IBM) 10. Physical Medium sublayer (ATM) 1. Prompt Maintenance Alarm 2. Physical Medium Attachment Police Mutual Aid Radio System Pilot Make-Busy (circuit) Packet Mode Bearer Service 1. Public Mobile Carrier 2. Perfect Magnetic Conductor Plastic Multichip Module 1. Physical Medium Dependent (protocol sublayer) 2. Polarization Mode Dispersion (ﬁber optics) 1. Project Management Institute 2. Property Management Interface Paged Memory Management Unit (PC chip) P-channel MOS (semiconductors) 1. Point-to-Multipoint (radio system) 2. Project Management Professional 1. Private Mobile Radio 2. Poor Man’s Routing (packet switching) 3. Professional Mobile Radio Private Mobile Radio System 1. Pantone Matching System (programming language) 2. Picturephone Meeting Service (AT&T) 3. Property Management System (software) 1. Photo Multiplier Tube 2. Photo Mechanical Transfer 3. Personal Mobile Telecommunications 4. Program Map Table (TV broadcast) Parametric Measurement Unit 1. Personal Number 2. Positive-Negative Junction (semiconductors)

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Pp

PNC PNdB PNF .png PNG PNI PNM PNN PNNI PNO PnP PNP PNPN PNS PNT PO PoC POC POCSAG POD

PODA PODP POEM POF POFS POGO POH POI POL POLDER POLSK PON

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261

Police National Computer Perceived Noise level in dB 1. Portable Network Frame 2. Planar Near-Field (range) Name extension for PNG format ﬁles (graphics) Portable Network Graphics (ﬁle format) Permit Next Increase (ATM) Public Network Management Probabilistic Neural Network Private Network-to-Network Interface (ATM) Public Network Operator Plug and Play (computer standard) 1. Positive-Negative-Positive (semiconductors) 2. Permanent Number Portability Positive-Negative-Positive-Negative junction (semiconductors) Personal Number Service Private Network Termination Point of Origin Push-to-talk over Cellular Point Of Contact Post Ofﬁce Code Standardization Advisory Group (protocol) 1. Piece Of Data 2. Processing Of Data 3. Point Of Deployment (cable TV) 4. Personal Operable Device Priority Oriented Demand Assignment Public Ofﬁce Dialing Plan Polar-Orbit Earth Observing Mission (remote sensing) Plastic Optical Fiber Private Operational Fixed Service (microwave) Post Ofﬁce Goes Obsolete 1. Path Overhead (MUX) 2. Power-On Hours (production rating) 1. Point Of Interconnection 2. Point Of Interface (LATA) 3. Parallel Optic Interfaces 1. polarizer 2. polarization Polarization and Directionality of the Earth’s Reﬂectance Polarization Shift Keying (modulation) Passive Optical Network

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P

262

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

PoP POP POP3 POPS POR PoS POS

POS-PHY POSI POSIT Positron POSIX POST Pot POT POTS POTS-C POTS-R POTV POV Power Power PC PP PPA PPARC PPBM PPCP PPD PPDN PPDR PPDU PPG PPGA

Point of Presence (networking) Post Ofﬁce Protocol (e-mail) Post Ofﬁce Protocol version 3 (e-mail) Post Ofﬁce Protocol-Secure Paciﬁc Ocean Region (Inmarsat) Packet over SONET 1. Paciﬁc Ocean Satellite 2. Point Of Service 3. Point Of Sale (electronic transactions) 4. Personal Operating Space (IEEE) Packet Over SONET-Physical layer Promoting Conference for OSI (Japan) Proﬁles for Open Systems Internetworking Technology Positive electron Portable Operating System Interface for Unix environment Power-On Self-Test (computers) Potentiometer (electronics) 1. Plain Old Telephony (service) 2. Point Of Termination 3. Point Of Train (transmission) Plain Old Telephone Service Plain Old Telephone Service-Centralized (ADSL) Plain Old Telephone Service-Remote (ADSL) Plain Old TV (Microsoft) Peak Operating Voltage (electronics) Performance Optimization With Enhanced RISK (processor) Performance Optimized With Enhanced RISK Personal Computer 1. Portable Part 2. Pointer Processor 3. Polarization-Preserving (optical ﬁber) Production Photographic Area Particle Physics and Astronomy Research Council (UK) Pulse-Polarization Binary Modulation PowerPC Platform 1. Partial Packet Discard (ATM) 2. Pay Per Download (software download) Public Packet Data Network Public Protection and Disaster Relief (service) PLCP protocol data unit Pulse Pattern Generator Plastic Pin-Grid Array (microchips)

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Pp

ppi PPI PPL ppm PPM

PPN PPO PPP PPP/MP PPPI PPPoA PPPoE pps PPS

PPSN PPSR PPSS PPT PPTP PPV PQA PQFP PQSCADA PR

PRA PRACH

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pixels per inch (displays) 1. Plan Position Indicator (radar) 2. PDH Physical Interface Pioneer Preference Licensees (wireless) pages per minute (printers) 1. Pulse-Position Modulation 2. Pulse-Phase Modulation 3. Pulse Per Minute (parameter) 4. Parts Per Million (data errors) 5. Periodic Permanent Magnet 6. Pseudo-Permanent Magnet 7. Periodic Pulse Metering Processor Port Network Peak Power Output 1. Point-to-Point Protocol 2. Phased Project Planning Point-to-Point Protocol/Multilink Protocol Precision Plan-Position Indicator Point-to-Point Protocol over ATM (DSL) Point-to-Point Protocol over Ethernet (DSL) 1. packets per second 2. pulses per second 1. Path Protection Switch 2. Precise Positioning Service (GPS) 3. Peripheral Power Supply 4. Permanent Presentation Status Public Packet-Switched Network (frame relay) Path Protection Switched Ring (MUX) 1. Public Packet-Switched Service (frame relay) 2. Positron Public Safety Systems (U.S.A.) Precision Pad Technology Point-to-Point Tunneling Protocol (VPNs) Pay-Per-View (TV broadcasting) 1. Path Quality Analysis 2. Palm Query Application (PDAs) Plastic Quad-leaded Flat Pack (microchips) Power Quality SCADA (remote control) 1. Precipitation Radar 2. Pulse Rate 3. Pseudo-Range (microwave) 4. Performance Rating (processing power) 5. Pattern Recognition Primary Rate Access (ISDN) Physical Random Access Channel

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263

P

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

PRAM PRB PRBA PRBS PRC PRD Preamp Pre-emph Prefs PREP PREST PRF PRG PRI PRI-EOP PRI-MPS PRIDE PRISM PRK PRM PRMA PRMD PRML PRN PRNG PRO PROFS Prolog PROM PROSIGN PROTEL Protn PROWORD PRR

Programmable RAM (memory) 1. Primary Reference Burst 2. Private Radio Bureau Portable Rechargeable Battery Association Pseudo-Random Bit-Sequence (data encoding pattern) 1. Protection, Restoration, Combination 2. Primary Reference Clock (networking) Preamble Detector Pre-ampliﬁer (electronics) Pre-emphasis (frequency modulation) preferences PowerPC Reference Platform (speciﬁcation) Center for Policy Research in Engineering, Science and Technology. U.K. group Pulse Repetition Frequency (radar) Preamble Generator 1. Primary Rate Interface (ISDN) 2. Primary Rate ISDN (service) 3. Public Radio International Procedure Interrupt-End Of Page (fax machine) Procedure Interrupt-Multipage Signal (fax machine) Police Regionalized Information and Data Entry (Canada) Panchromatic Remote-sensing Instrument for Stereo Mapping Phase-Reversal Keying (modulation) Pulse-Rate Modulation Packet Reservation Multiple Access Private Management Domain (X.400) Partial-Response Maximum-Likelihood (disk storage) 1. Logical device name for Printer 2. Pseudo-Random Noise Pseudo-Random Noise Generation (bluetooth) Precision RISC Organization Professional Ofﬁce System (software) Programming logic (programming language) Programmable ROM (memory) Procedure Sign Procedure Oriented Type Enforcing Language (software) protection Procedure Word Pulse Repetition Rate (parameter)

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Pp

PRS

PRSL PRSM PRT PrtSc .ps ps PS

PS-ACR PS-NEXT PS/2 PSA

PSAI PSAP PSB PSC

PSCS PSD PSDN PSDS PSDTS PSE psec PSELFEXT PSG psi

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1. Premium Rate Service 2. Personal Radio Service 3. Primary Reference Source (network clock) 4. Pattern Recognition System Primary Rate Switch Locator Post Release Software Manager Planar Resistor Technology Print Screen (PC keyboard) Name extension for PostScript printer ﬁles (computer) picosecond (10K12 second) 1. Power Supply 2. Paging System 3. Phase Shift 4. Portable Station 5. Packet Switching Power Sum-Attenuation-to-Crosstalk Ratio Power Sum-Near-End CrossTalk Personal System/2 (IBM PCs) 1. Point of Service Activation (Inmarsat) 2. Protected Service Area (FCC) 3. Public Service Agreement (Inmarsat) 4. Polysilicon Self-Aligned (bipolar transistor) Processor-to-Switch Applications Interface (AT&T) Public Safety Answering Point Pink-Slip Blizzard (microwave) 1. Public Services Committee (IMSO) 2. Packet-Switched Capable (GMPLS) 3. Public Services Commission (U.S.A.) 4. Path Switching Count 5. Permanent-Split Capacitor (motors) Personal Space Communication Service 1. Power Spectral Density (carrier frequency) 2. Phase Sensitive Detector Public-Switched Data Network Packet-Switched Data Network Public-Switched Data Service (AT&T) Public-Switched Data Transmission Service (AT&T) 1. Packet Switching Exchange 2. Please (Morse code transmissions) picosecond Power Sum Equal Level Far-End CrossTalk Programmable Sound Generator pounds per square inch (telephone cables)

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PSI PSID PSK PSL PSM PSMBS Psmc-channel PSMM PSN

PSNEXT PSO PSOP PSP

PSPDN PSPP PSQM PSR PSRAM PSRCP PSRR PSS PSS1 PSTLXN PSTN PSU PSW PSWAC PSWN

1. Packet Switching Interface 2. Program Speciﬁc Information (broadcasting) Private System Identiﬁer (signaling) Phase-Shift Keying (modulation) Physical Signaling Sublayer (LANs and MANs) 1. Phase-Shift Modulation 2. Pulse-Spacing Modulation 3. Power Supply Module Public-Safety Mobile Broadband Speciﬁcations Packet-mode channel for system management and control Pilot Strength Measurement Message 1. Packet-Switched Network 2. Packet Switching Node 3. Public-Switched Network 4. Processor Serial Number (Intel Pentium III) Power Sum NEXT (cabling) 1. Public Service Obligations 2. Ports and Shipping Organization (Iran) Plastic Small Outline Package (microchips) 1. PCS Service Provider 2. Payphone Service Provider 3. Purchase Service Provider 4. Programmable Signal Processor 5. Power Supply Production company (Iran) Packet-Switched Public Data Network Public Safety Partnership Project Perceptual Speech Quality Measure 1. Petabit Switch Router 2. Professional Satellite Receiver Pseudo-Static RAM (memory) Public Safety Radio Communication Project Power Supply Rejection Ratio 1. Packet-Switched Service 2. Packet-switched Streaming Service 3. Physical Signaling Sublayer (OSI model) Private Signaling System number 1 Public-Switched Telex Network Public-Switched Telephone Network 1. Power Supply Unit 2. Packet Switch Unit Path Switch Public Safety Wireless Advisory Committee Public Safety Wireless Network

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Pp

PT PTA PTC

PTCE PTCL PTE PTF PTFE PTI PTK PTM PTMPT PTN PTNX PTO PTP PTR PTS

PTSE PTSP PTT PTTI PTTC PTY PU

&

1. Payload Type (ATM) 2. Personal Telecommunications 3. Path Termination Programmable Tracking Antenna 1. Portable Teletransaction Computers 2. Personal Telecommunications Center 3. Paciﬁc Telecommunications Council (U.S.A.) 4. Positive Temperature Coefﬁcient (thermistors) 5. Public Telecoms Corporation (Yemen) Permanent Test Control Element Pakistan Telecoms Company Ltd Path Terminating Element (SONET) 1. Patch and Test Facility 2. Polymer Thick-Film Polytetrafluoroethylene (cables) 1. Payload Type Indicator (ATM) 2. Power Terrestrial Interface 3. Primary Terrestrial Interface Pars Telephone Kar company (Iran) 1. Pulse-Time Modulation 2. Path Trace Mismatched (MUX) 3. Packet Transfer Mode Point-To-Multipoint Public Telecommunications Network Private Telecommunications Network Exchange 1. Public Telephone Operators 2. Public Telecommunications Operator 3. Patent and Trademark Ofﬁce (U.S.A.) Point-To-Point (microwave) 1. pointer (MUX) 2. Problem Tracking Report 1. Personal Telecommunications System 2. Proﬁle Test Speciﬁcation 3. Proceed To Select tone (Inmarsat) 4. Presentation Time Stamp (MPEG2 encoder) PNNI Topology State Element (ATM) PNNI Topology State Packet (ATM) 1. Post, Telephone and Telegraph administrations 2. Push-To-Talk (wireless systems) precise time and time interval Paper Tape Transmission Code party 1. Physical Unit (IBM SNA) 2. Power Unit

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267

P

268

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pub PUC PUCP PUK PUMA PUP PUT pV PV PVA PVC

PVCC PVD PVDF PVDM PVN PVPC PVR PVT PvtDN pW PWB PWD PWL PWM pWp PWR PWS PWT PX PXE PXI PXML PXP PZT

Comprehensive Glossary of Telecom Abbreviations and Acronyms

short for public (directory) 1. Public Utilities Commission 2. Personal Unlocking Code Physical Unit Control Point (SNA) PIN Unblocking Key (GSM) Product Upgrade Manager PARC Universal Packet Programmable Unijunction Transistor (semiconductors) picovolt (10K12 Volt) Photovoltaic (electronics) Perigee Velocity Augmentation (satellite) 1. Permanent Virtual Circuit (frame relay) 2. Private Virtual Circuit 3. Permanent Virtual Connection 4. Polyvinyl Chloride (cables) 5. Premises Visit Charge Permanent Virtual Channel Connection (ATM) 1. Peak Voltage Detect 2. Physical Vapor Deposition Polyvinyl Diflouride (cables) Packet Voice Data Module Private Virtual Network Permanent Virtual Path Connection (ATM) Personal Video Recorder Performance Veriﬁcation Test Private Data Network picowatt (10K12 Watt) Printed Wiring Board Print Working Directory Pass word Listing (ﬁle) Pulse-Width Modulation picowatt, psophometrically weighted power (electronics) Power Supply 1. Personal Wireless Telecommunications 2. Personal Wireless Telephony Private Exchange Preboot Execution Environment PCI Extension for Instrumentation Private Exchange Master List Packet Exchange Protocol Piezoelectric Transducer (electronics)

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Qq q Q Q Bit Q factor Q.SIG Q&A Q-band Q-Tel QA QAM

QAPSK QAS QASK QBE QBF QC

1. Symbol for quantum value 2. Symbol for electric charge in coulomb 1. Symbol for Quality factor (electronics) 2. Queue Qualiﬁer data Bit (X.25 packet switching) Quality factor Q Interface Signaling Question and Answer (teleconferencing) Radio frequency band ranging from 36 to 46 GHz Qutar Telecommunications Company (operator) 1. Quality Assurance (hardwares) 2. Queued Arbitrated (SMDS) 1. Quadrature Amplitude Modulation 2. Quaternary Amplitude Modulation 3. Quadrature Asynchronous Multiplexer (Timeplex) 4. Queued Access Method 5. Quad Asynchronous I/O Module (Intelsat) Quadrature Amplitude PSK (modulation) Quick Arbitrate and Select Quadrature ASK (modulation) Query By Example (databases) “Quick Brown Fox” (test text message) 1. Quality Control (of products) 2. Quantum Cascade (laser) 269

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Q

270

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

QCELP QCIF QCPSK QCT QD QDOS QDR QDU QE QFA QFB QFC QFD QFM QFP QIC QICC QIFM QIP QJDP QL QLLC QM

QML QMS QO QO-CDMA QoR QoS QoSR QPAM QPL QPM QPR QPRS

Qualcomm Codebook Excited Linear Prediction (voice coding) Quarter-Common Intermediate Format (video compression) Quadriphase Coherent PSK (modulation) Qualcomm CDMA Technologies Queuing Delay Quick and Dirty Operating System (Microsoft) Quad Data Rate Quantizing Distortion Unit (voice quality) Quantum Efﬁciency (photomultiplier) Quick File Access Quad Flat Butt-leaded package (microchips) Quantum Flow Control (ATM) Quality Function Deployment Quadrature Frequency Modulation Quad Flat Pack (microchips) Quarter Inch Cartridge (tape storage) 1. Quad Integrated Communications Controller (microchips) 2. Quad International Communications Corporation Quadrature Intermediate Frequency Mixer 1. Quadritek Internet Protocol (software) 2. Quad In-line Package (microchips) QIP Joint Developer Program Query Language (programming) Qualiﬁed Logical Link Control (X.25) 1. Quadrature Modulation 2. Qualiﬁcation Model 3. Quantum Mechanics 4. Queue Management Qualiﬁed Manufacturers List (of products) Queue Management System Quartz Oscillator Quasi-Orthogonal CDMA (access) Query-on-Release (databases) Quality of Service Quality of Service Routing (IETF) Quadrature Phase-Amplitude Modulation 1. Qualcomm Pure-Voice Library 2. Qualiﬁed Products List Quasi-Phase-Matched Quadrature Partial Response Quadrature Partial Response Shift

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Qq

QPSK QPSX QR QRA QRNS QRSS QS QSAM QSDG QSIG QSL QSLing QSLs QSM QSOP QSS .qt QT QTAG QTAM QTC QTCP QTSS QTVR QuAD Quad IW QUALDIR QUICC QUIL QUIP QVGA QW QWERTY QWIP QWR QZSS

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Quadrature PSK (modulation) Queued Packet Synchronous Exchange (LANs) 1. Queuing Requirements 2. Quasi-Random Quick Response Alarm Quadratic Residue Number System 1. Quasi-Random Sequence Signal 2. Quasi-Random Signal Source Quasi-Synchronous Quadrature Sideband Amplitude Modulation Quality of Service Development Group Q-Interface Signaling (protocol) Morse Question code for ‘Do you Acknowledge Receipt of a good Signal Level of my station?’ (Ham Radio) The act of receiving QSL card of a short wave radio station by a listener (Ham Radio) QSL cards of a short wave radio station (Ham Radio) 1. Quad Synchronous Module 2. Queued Serial Module Quad Small-Outline Package (microchips) Quasi-Stellar Radio Source (Intelsat) Name extension for Quick Time ﬁles (computer) Qualiﬁcation Test Quality Test Action Group Queued Telecommunications Access Method (IBM) Quick Time Conference (Apple Macintosh) Quad Tape Carrier Package (microchips) Quick Time Streaming Server Quick Time Virtual Reality Quorum Associate Distributor Quad Inside-Wire Qualiﬁcation Directive (wireless) Quad Integrated Communications Controller Quad In-Line (microchips) Quad In-line Package (microchips) Quad Video Graphics Array (monitors standard) Quantum Well Q,W,E,R,T,Y (left side, top row of letter keys on the keyboard) Quantum Well Infrared Photodetector Quarter-Wave Rule Quasi-Zenith Satellite System (Japan)

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Q

Rr r r/m r/s R R&D R&E R&O R&QA R&S R&TTE R-BGAN R-channel R/T R/W RA

Symbol for revolution revolutions per minute revolutions per second 1. Symbol for Resistor or Resistance (electronics) 2. Symbol for Roentgen (unit of X-rays exposure dose) Research and Development 1. Research and Education 2. Research and Engineering Report and Order Reliability and Quality Assurance (Intelsat) Research and Statistics Radio and Telecommunications Terminal Equipment directive Regional BGAN terminal (Inmarsat) Random-access channel 1. Receive and Transmit 2. Real-Time Read and Write (memories) 1. Real Audio 2. Return Authorization 3. Rate Area 4. Remote Access 5. Routing Area 273

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

RA# RA-EN RA/TDMA RAAN RAB RABAL RABC RAC RACE RACES RACF RACH RACON RACS rad RAD

RADA RADAN radar RADARSAT RADB RADHAZ RADIAC RADINT RADIR RADIUS RADL RADNOS radome RADP RADSL

Return Authorization number Radio Amateur Emergency Network Random-Access mode TDMA (access) Right Ascension of the Ascending Node (satcom) Radio Advertising Bureau Radiosonde Balloon (meteorology) Radio Advisory Board of Canada 1. Radio Amateurs of Canada 2. Remote Access Concentrator 3. Repeat Automated Command 1. Research in Advanced Communications in Europe 2. Random-Access Computer Equipment Radio Amateur Civil Emergency Service 1. Resource Access Control Facility 2. Radio Access Control Function (PCS) Random-Access Channel (GSM) Radar transponder beacon 1. Remote Access Control Services 2. Remote Access Calibration Services/System 3. Remote Access Computing Services/System radian (unit of angle) 1. Rapid Application Development (SQL databases) 2. Radiation Absorbed Dose (medicine) 3. Radiance 4. Random-Access Device 5. Recorded Answering Device 6. Remote Antenna Driver Random-Access Discrete Address (Intelsat) Radar Doppler Automatic Navigation system radio detecting and ranging Radar Satellite (Canada) Routing Arbiter Database Radiation Hazard (electromagnetism) Radioactivity Detection, Identiﬁcation, And Computation Radar Intelligence Random-Access Document Indexing and Retrieval Remote Authentication Dial-In User Service (ISPs) 1. Radio Laboratory 2. Reticular Agent Deﬁnition Language (programming) Radio fadeout (no signal) caused by Solar explosions radar dome Remote Access Data Processing Rate-Adaptive DSL (access)

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Rr

RADTR RAE RAF RAG RAI RAID RAIM RAIN RAIS RAM

RAMAC RAMARK RAMDAC RAMS RAN RAND RANP RAO RAP RAPCON RAPID RARC RARE RARP RAS

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275

radiator Rafsanjan Asre Electronic company (Iran) Rate Adjustment Factor Request Handling and Assignment Generation (Intelsat) Remote Alarm Indication Redundant Array of Independent Disks (data storage) Receiver Autonomous Integrity Monitoring (GPS) Redundant Array of Independent Networks Redundant Array of Independent Systems 1. Random-Access Memory (data storage) 2. Radar-Absorbing Material (microwave) 3. Remote Access Multiplexer 4. Reliability, Accessibility, and Maintainability Random Access (IBM) Radar Marker Random-Access Memory Digital-to-Analog Converter Random-Access Measuring System 1. Regional Area Network 2. Recorded trunk Announcement 3. Return Authorization Number (defective hardware) 1. Random number (GSM) 2. Rural Area Network Design 3. Reasonable And Non-Discriminatory (licensing) Regional Air Navigation Plan (aviation) 1. Radio Astronomy Observatory 2. Revenue Accounting Ofﬁce 1. Remote Access Point 2. Route Access Protocol 3. Radar-Absorbing Paint (microwave) Radar Approach Control Reserved Alternate Path with Immediate Diversion (frame relay) Regional Administrative Radio Conference (Intelsat) Re´seaux Associe´s pour la Recherche Europe´enne (France) Reverse Address Resolution Protocol (networking) 1. Radio Astronomy Station 2. Remote Access Server 3. Remote Access Service 4. Random-Access Storage 5. Registration, Admission, and Status (protocol) 6. Row Address Strobe (logic signal) 7. Russian Academy of Sciences

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R

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

RASC raser RASSP RAT RATCC RATP RATS RATT RAVE RAW rawin RAWOL RAX RAYDAC RAYNet RB RB1 RB2 RBB RBBS RBC RBDS RBER RBOC RBR RBS RBT RBV RBW RBWG RbXO RC

1. Radio Amateur Satellite Corporation of North America 2. Royal Astronomy Society of Canada radio ampliﬁcation by stimulated emission of radiation Rapid prototyping of Application Speciﬁc Signal Processors Remote Access Trojan (network computer) Radar Air Trafﬁc Control Center Reliable Asynchronous Transfer Protocol Radio Amateur Telecommunications Society Radio Teletypewriter Real-time Audio/Visual Environment Read After Write (memories) 1. radar wind 2. radio wind Radar Without Line-of-sight Rural Automatic Exchange Raytheon Digital Automatic Computer Radio Amateur Emergency Network 1. Reference Burst 2. Radar Beacon 3. Reverse Battery Reference Burst 1 Reference Burst 2 Residential Broadband (service) Remote Bulletin Board System Radiation Boundary Conditions Radio Broadcast Data System Residual Bit-Error Rate (transmission) Regional Bell Operating Company Radar Bind Range 1. Robbed-Bit Signaling 2. Radio Base Station 3. Radar Bind Speed Receive Burst Timing Return Beam Vidicon camera (remote sensing) 1. Reverse Band Working 2. Resolution Band width (oscilloscopes) Residential Broadband Working Group (ATM) Rubidium-Crystal Oscillator 1. Remote Control 2. Radio Control 3. Resource Controller 4. Restricted Channel

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Rr

RCA RCAT RCC

RCDD RCEE RCF

RCG RCI RCIT RCL RCM RCP

RCS

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277

5. Reference Clock 6. Reﬂection Coefﬁcient (ﬁber optics) 7. Rate Center 8. Resistance–Capacitance (electronic circuits) 1. Regional Calling Area (of a telephone company) 2. Remote Control Access 3. Radio Corporation of America cables (company) Radio Communications Analysis Test 1. Rescue Coordination Center (COMSAR) 2. Rectangular Chip Carrier 3. Radio Common Carrier (cellular networks) 4. Regional Commonwealth in the ﬁeld of Communications 5. Radiocommunications Consultative Council (Australia) 6. Reduced Complexity Computing Registered Communications Distribution Designer Resource Control Execution Environment (Telcordia Technologies) 1. Radio Control Function (PCS) 2. Radio Chre´tiennes en France (broadcaster) 3. Remote Call Forwarding (service) 4. Remote Control Facility Reverberation-Controlled Gain (circuit) Remote Card Identiﬁer Research Center Information Technology Restrictive Cabling License (Australia) 1. recall (cellular phone) 2. Runtime Control Library 1. Remote Carrier Module 2. Release Complete Message 3. Radar-Countermeasure (electronics) 1. Remote Copy Protocol 2. Remote Copy Program (Berkeley UNIX) 3. Remote Control Panel 4. Radar Communication Processor 5. Real-time Control Program 6. Radio Control Point 7. Right-Circular Polarization (antennas) 1. Revision Control System 2. Remote Control System 3. Radar Cross-Section 4. Radio Corporation of Singapore (broadcasting) 5. Radio Communications Service

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R

278

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

RCT RCTL RCU RCV RCVO RCVR rd Rd-channel RD

RDB RDBMS RDBS RDC RDCCH RDF RDI RDIST RDM RDMA RDMS RDN RDO RDP RDPC RDQ RDR RDRAM RDS RDSI RDSS

1. Remote Craft Terminal 2. Reduced Carrier Transmission Resistor–Capacitor–Transistor Logic (digital electronics) Remote Concentration Unit receive Receive Only (satcom) receiver rad (unit of absorbed radiation exposure dose) Random-access channel (data communication) 1. Routing Domain (ATM) 2. Routing Diagram 3. Routing Directory 4. Directional Radiobeacon 5. Received Data (logic signal) 6. Reﬂection Density (ﬁber optics) 1. Receive Data Buffer 2. Remote Database Relational Database Management System Routing Database System 1. Remote Digital Concentrator 2. Redirect Conﬁrm packet (CDPD) Reverse Digital Control Channel (cellular networks) 1. Radio Direction Finder/Finding (equipment) 2. Rate Decrease Factor (ATM) 1. Remote Defect Indication (ATM) 2. Restricted Digital Information 3. Restricted Digital Information (ISDN) Remote ﬁle Distribution Program Receive Driver Module Remote Direct Memory Access Relational Database Management System (ICT) Radio Data Network Remote Data Objects (Visual Basic) 1. Radar Data Processing 2. Reliable Data Protocol Remote Data Port Card Redirect Query packet (CDPD) Redirect Request packet (CDPD) Rambus Dynamic RAM (memory) 1. Radio Data System 2. Radio Determination Service The Spanish equivalent for ISDN Radio Determination Satellite Service (ITU-T)

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Rr

RDT

RE REA REAC READ Rec RECAPSS ReCCIT RECO RECON RECT RED REED REG REGEDIT REGNOT REJ REL RELP RELURL REM Remod REMOS REN REO Rep REP REPACCS REPROM REQ RES

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1. Recall Dial Tone 2. Remote Digital Terminal 3. Request Data Transfer (control character) 4. Romanian Domestic Telephony Radio Exchange Rural Electriﬁcation Administration Reeves Electronic Analog Computer Relative Element Address Designate recommendation (ITU) Remote Cable Pair Switching System Research Center for Communications and Information Technology Resources (people), Equipment, Circuits, and Other (IBM) Reconnaissance rectiﬁer (electronics) 1. Random Early Detection (QoS) 2. Reﬂection Electron Diffraction (crystals) Restricted Edge-Emitting Diode 1. Range Extender with Grain (transmission) 2. Regenerator Registry Editor Registration Notiﬁcation (wireless) Reject (link protocol command) release (message) Residually Excited Linear Prediction (voice coding) Relative URL 1. Remote Equipment Module 2. Ring Error Monitor (LANs) 3. Roentgen Equivalent Man remodulation Resources Management Online System 1. Ringer Equivalence Number (telephone set) 2. Rename the current ﬁle (MS DOS Command) Removable Erasable Optical repeater 1. Roentgen Equivalent Physical 2. Right-Elliptical Polarization (antennas) Remote Cable-Pair Cross-Connect System Reprogrammable ROM (memory) request 1. Remote Earth Station 2. Regional Earth Station 3. Residential Enhanced Service

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RET RETMA REV REW REX REXX RF

RFA

RFAC RFB RFBP RFC RFCA RFCOH RFD RFE RFF RFHMA RFI

RFICs RFID RFMD RFMU RFO RFOI RFP

Comprehensive Glossary of Telecom Abbreviations and Acronyms

4. reserved (ATM) 5. Radio Equipment and System return Radio-Electronics-Television Manufacturers Association reverse rewind Routine Exercise Restructured Extended Executor (programming language) 1. Radio Frequency (10 kHz to 3 MHz range) 2. Reference Frequency 3. Range Finder 4. Rating Factor 5. Raster File 1. Radio Frequency Allotment 2. Request For Action 3. Receive Frame Acquisition 4. Remote File Access Restricted Forced Authorization Code Radio Frequency Board Request For Business Plan (contracts) 1. Request For Comments (Internet) 2. Required For Compliance 3. Radio Frequency Choke (electronics) Radio Frequency Channel Allotment Radio Frame Complementary Overhead bit Request For Discussion (Internet) Radio Free Europe (broadcaster) 1. Radio Frequency Fingerprinting 2. Raster File Format Random Frequency Hopping Multiple Access 1. Request For Information (contracts) 2. Radio Frequency Interference 3. Radio France Internationale (broadcaster) 4. Remote Failure Indication Radio Frequency Integrated Circuits Radio Frequency Identiﬁcation RF Micro Devices company (China) Radio Frequency Monitoring Unit Reseaux France Outre-mer (broadcaster) Radio Fiber Optic Integration 1. Request For Proposal (contracts) 2. Radio Fixed Part (GSM)

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Rr

RFQ RFS

RFT RFT DCA RFTS RFU RG RGB RGO RGP RGS RH RHC RHCP RHEED RHEP RHET Rhm RHP RHR RI RIA RIAA RIACS RIAS RIB RIBE

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Request For Quotation (contracts) 1. Receive Frame Synchronization 2. Request For Service 3. Ready For Service 4. Remote File Sharing (networking) 5. Radio Frequency System 6. Radio Frequency Simulator 7. Radio Frequency Shift (broadcasting) 8. Range Finding System 9. Real File Store 1. Radio Frequency Transceiver 2. Receive Frame Timing Revisable-Form-Text Document Content Architecture Remote File Transfer System Radio Frequency Test Set Radio Frequency Unit 1. Radio Guide 2. Ring Generator Red–Green–Blue (TV and CRT monitors) Royal Greenwich Observatory Raster Graphics Processor Route Guidance System 1. Request Header 2. Response Header Regional Holding Company Right-Hand Circular Polarization (microwave) Reﬂected High-Energy Electron Diffraction Right-Hand Elliptical Polarization Resonant-tunneling Hot-Electron Transistor (semiconductors) Roentgen-per-hour-at-one-meter Reconﬁgurable Hardware Products 1. Radar Horizon Range 2. Radio Horizon Range 1. Ring-Indicator (RS232) 2. Radio Interference 3. routing indicator Routing Indicator Allocation Recording Industry Association of America Research Institute for Advanced Computer Science Research Institute for Advanced Studies 1. Routing Information Base (BGP) 2. RenderMAN Interface Bytestream Reactive Ion Beam Etching

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

RIC RIE RIF RIFF RII RILD RIM RIME RIMM RIMPATT RIMS RIN RIO RIP

RIPE RIPL RIPscript RIPSO RIR RIS RISC RISLU RISR RiSU RIT RITL RIU RJ RJE RJEP RKA RL

1. Regional Information Center 2. Rafsanjan Industrial Complex (Iran) Reactive Ion Etching 1. Routing Information Field (LANs) 2. Rate Increase Factor (ATM) Raster Image File Format Routing Information Indicator Remote ISDN Line Drawer 1. Remote Integrated Multiplexer 2. Research In Motion RelayNet International Message Exchange Rambus In-line Memory Module (Macintosh, PCs.) Read IMPATT (diode) Ranging and Integrity Monitoring Station (navigation) Relative Intensity Noise Reusable Information Object 1. Routing Information Protocol (networking) 2. Remote Imaging Protocol 3. Raster Image Processor 4. Refractive Index Proﬁle (waveguides) Reseaux IP Europeens (a group) Remote Intelligent Parallel Load (method) Remote Imaging Protocol script (language programming) Revised Interconnection Protocol Security Option Regional Internet Registries Retroreﬂector In Space (remote sensing) 1. Reduced-Instruction-Set Computing (processor chips) 2. Reduced Instruction Set Chip Remote Integrated Services Line Unit (Lucent Technologies) Remote Interrupt Service Routine Remote indoor Service Unit (cable telephony) Rate of Information Transfer Radio In The Loop (cable telephony) Ring Interface Unit Registered Jack Remote Job Entry (terminal) Remote Job Entry Protocol Rossiskaja Kosmitaska Agentura (Russian Space Agency) 1. Return Loss 2. Radio Locator

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Rr

RLAN RLB RLC

RLCE RLCM RLCS RLE RLES RLG RLIN RLL RLLS RLMS RLN RLOGIN RLP RLQ RLR RLS RLSD RLT RM RMA

RM-Cell RMAS RMATS RMCP RME RMF

&

3. Rotating Linear (antenna pattern) 4. Resistor-Coil (circuit) Radio LAN Remote Loop-Back 1. Release Complete message 2. Resistance–Inductance–Capacitance (electronic circuits) 3. Run Length Coding 4. Remote Line Concentrator Remote Line Concentrate Equipment Remote Line Concentrating Module Remote Live Call Screening (Panasonic phone) 1. Run Length Encoding (data compression) 2. Research Laboratory of Electronics Regional Land Earth Station (Inmarsat) Ring Laser Gyroscope Research Libraries Information Network 1. Run Length Limited (data encoding) 2. Radio Local Loop Radio Location Land Station Radio Location Mobile Station Remote LAN Node Remote Log-In application 1. Radio Link Protocol (TIA) 2. Resource Location Protocol Rate-Limiting Queues Receive Loudness Rating 1. release button (telephone set) 2. Remote Live Screening (telephone feature) Received Line Signal Detect Release Link Trunk 1. Resource Management (ATM) 2. Reference Model (OSI model) 1. Radio Manufacturers Association 2. Random Multiple Access 3. Remote Memory Access 4. Returned Merchandise Authorization code 5. Returned Merchandise Authorization Number Resource Management Cell (ATM) Remote Memory Administration System Remote Maintenance And Test System Remote Mail Checking Protocol Remote Mediation Equipment Remote Management Facility

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283

R

284

&

RMI RMII RMM RMON RMOS RMP rms RMS RMS-D1 RMTP RMU RMW RNA RNC RNCC RND RNE RNG RNLS RNMS RNO RNP RNR RNS RNSS RNX RO

R/O ROA ROADS ROBO ROC

ROD RODB

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Radio Magnetic Interference 2. Resource Manager Interface Reduced Media Independent Interface Real-Mode Mapper (Windows) Remote Network Monitoring (networking) Refractory Metal-Oxide Semiconductor Roving Monitor Port root-mean-square (output power parameter) Record Management System Remote Measurement System Digital 1 Reliable Multicast Transport Protocol Remote Mask Unit Read-Modify-Write (software) 1. Ring No Answer (modems) 2. Remote Network Access Radio Network Controller (cellular networks) Regional Network Control Center Radio Network Design Railway Network Exchange Random Number Generator Radio Navigation Land Station Radio Navigation Mobile Station Radio Network Optimization Radio Network Planning Receiver Not Ready (link protocol command) Radio Navigation Satellite (ITU) Radio Navigation Satellite Service (ITU) Restricted Numeric Exchange 1. Routing Organization (Inmarsat) 2. Receive-Only (earth station) 3. Read-Only (ATM) 4. Remote Operation 5. Recovery Operation 6. Ring-Off Radio Ofﬁcer (shipping) Recognized Operating Agency (ITU) Robust Open Architecture Distributed Switching Remote Ofﬁce/Branch Ofﬁce market 1. Ring Operations Center 2. Rate Of Convergence 3. Record Of Comments 4. Regional Operating Company (Bell) Rewritable Optical Disk Runtime Object Data Base

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Rr

ROE ROH ROHS ROI RoIP ROLC ROM ROM BIOS RON ROP RORA ROS ROSAT ROSE ROTA ROTHR ROTL ROTS ROV ROW RP

RPAD RPC RPDU RPE RPE-LTP RPF RPG RPI RPL rpm RPM RPN

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285

Return On Enquiry 1. Receiver Off Hook (telephone set) 2. Ringer Off Hook Restriction Of Hazardous Substances (directive) Return On Investment Radio over IP (service) Routing Over Large Clouds 1. Read-Only Memory (data storage) 2. Rough Order of Magnitude Read-Only Memory Basic Input/Output System Routing Organization Number Raster Operation (graphics) Region Oriented Resource Allocation 1. Read-Only Storage (data storage) 2. Remote Operations Service Roentgen Satellite Remote Operations Service Element (protocol) rotating schedule (call centers) Relocatable Over-The-Horizon Radar Remote Ofﬁce Test Line 1. Rotary Out-Trunk Switch 2. Rugged Off-The-Shelf Remotely Operated Vehicle Remote Order-Wire 1. Registration Point 2. Radio Part (GSM) 3. Range Processor 4. Rapid Prototyping Remote Playout And Distribution Remote Procedure Call (programming) Response Protocol Data Unit Radio Paging Equipment Regular Pulse Excitation—Long-Term Prediction (GSM) Reverse Path Forwarding (Internet) Report Program Generator (programming language) Radio Physical Interface 1. Remote Procedure Load 2. Remote Program Load 3. Repair Parts List revolutions per minute (hard drives) 1. Remote Packet Module 2. Red-hat Packet Manager (ﬁles) 1. Reverse Polish Notation (as in HP calculators)

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R

286

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

RPOA RPOL RPOP RPQ RPR RPRINTER rps RPS

RPT RPV RQC RQS RR

RRC RRD RRE RREI RRI RRM RRME RRN RROCP RROP RRPI RRR RRRP RRS RRSF RRSP RRST

2. Residual Phase Noise Recognized Private Operating Agency (common carrier) Role Playing Online Remote Post Ofﬁce Protocol Request for Price Quotation (contracts) Resilient Packet Ring Remote Printer (Novell NetWare) revolutions per second 1. Repetitive Pattern Suppression (data compression) 2. Ring Protection Switching (SONET) 3. Radar Processing System 4. Radio Protection Switch repeat Remotely Piloted Vehicle Repair and Quick Clean (in industry) Rate Quote System 1. Radio Regulations (ITU) 2. Radio Resource 3. Receiver Ready (link protocol command) 4. Return Rate 5. Rural Route 6. Round Robin (Internet) 1. Radar Resolution Cell 2. Raised-Root Cosine (mathematics) Remote Reconciliation Descriptor 1. Receive Reference Equivalent 2. Radar Range Equation Radio-Relay Equipment Interface Request Randomization Index Radio Resource Management (UMTS) Radio Resource Management Entity (AT&T) Routing Recording Number (AT&T) Restricted Radio Operator’s Certiﬁcate of Proﬁciency (shipping) Restricted Radiotelephone Operator Permit (FCC) Radio-Relay Physical Interface (MUX) Radio-Relay Regenerator (MUX) Radio-Relay Reference Point (MUX) 1. Remote Radar Station 2. Radio-Relay System RACF Remote Sharing Facility (PCS) Resource Reservation Setup Protocol Radio Regenerator Section Termination

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Rr

RRT RS

RS-1 RSA

RSAC RSB RSC RSCC RSCH RSD RSE RSF RSFG RSGB RSH RSID RSL RSM Rsmc-channel RSN RSOH RSPI

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287

Radio-Relay Terminal 1. Remote Site 2. Reduced Slope (optical ﬁber) 3. Remote Station 4. Regenerator Section (MUX) 5. Recommended Standard 6. Read Solomon code (error correction) 7. Record Separator (character control code) 8. Radio Satellite 9. Remote Single-layer (ATM) Russian amateur Satellite 1 1. Reliable Service Area (cellular networks) 2. Rural Service Area 3. Rural Statistical Area (FCC) 4. Remote Storage Area 5. Repair Service Answering (AINs) 6. Rivest-Shamir-Adleman (encryption algorithm) Recreational Software Advisory Council Repair Service Bureau 1. Remote Switching Center 2. Repair Service Center 3. Radio Station Central Russian Satellite Communication Company Radio Service Channel Unit Remote Speciﬁc Descriptor 1. Remote Subscriber Equipment 2. Remote Single-layer Embedded test method (ATM) Rostered Staff Factor (call centers) Route Server Functional Group (ATM) Radio Society of Great Britain Remote Shell (UNIX) Residential System Identiﬁer (cellular networks) 1. Request and Status Link (PBXs) 2. Received Signal Level (radio receiver) 3. Radio Signaling Link (GSM) 1. Remote Switching Module (AT&T) 2. Radio Subsystem Management (wireless) Random-access channel for system management and control 1. Radio Station Nodal 2. Robust Security Network (802.11i) Regenerator Section Overhead (MUX) Radio SDH Physical Interface (MUX)

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R

288

&

RSPX RSRB rss RSS RSSI RST

RST-RR RSU RSUP RSVP RSW RSZI RT

RT-VBR RTA RTANI RTB RTC

RTCA RTCP RTD

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Remote Sequenced Packet Exchange (Novell NetWare) Remote Source Route Bridging root sum square Remote Switching System 1. Received Signal Strength Indicator 2. Received Signal Strength Intensity 1. Radio Station Terminal 2. Regenerator Section Termination (MUX) 3. Readability, Strength, and Tone (Ham Radio) 4. Running Status Table (broadcasting) Regenerator Section Termination for STM-1 RadioRelay (MUX) 1. Remote Subscriber Unit 2. Remote Service Unit (cable telephony) 3. Remote Switching Unit Reliable SAP Update Protocol (Cisco) Resource Reservation Protocol 1. Rotary Switch 2. Relative Spectral Width Regional Subscription Zone Identity (GSM) 1. Radio Telephony 2. Real-Time 3. Rise-Time (pulses) 4. Runtime 5. Remote Terminal or Termination (DLC) 6. Recorder Tone 7. Routing Table Real-Time Variable Bit Rate (ATM) Remote Trunk Arrangement Real-Time ANI Regional Test Bed 1. Receive Timing Controller 2. Runtime Control (SCSA) 3. Runtime Code 4. Remote Tunable Combiner 5. Real-Time Clock 1. Requirements and Technical Characteristics for Aviation 2. Radio Technical Commission of Aeronautics Real-Time Conferencing Protocol 1. Round-Trip Delay (ATM) 2. Resonant-Tunneling Diode 3. Real-Time Display 4. Resistance-Temperature Detector (probe)

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Rr

RTDF RTDM RTDMS RTDP RTDS RTE RTF RTFD RTFS RTG RTI RTIP RTK RTL

RTM RTMA RTML

RTMOS RTMP RTN RTNDA RTNDF RTNR RTO-IS RTOS RTP

RTS

&

289

Radio Telephone Distress Frequency 1. Real-Time Data Migration 2. Rough Terrain Diffusion Model Real-Time Database Management System Radar Target Data Processor Real-Time Data System 1. Registered Terminal Equipment 2. Remote Terminal Emulation 1. Rich Text Format 2. Radio Terminal Function Recommended Technical Framework Document Remote Throttled First Service (ATM) Radio Telegraphy 1. Radiation Transfer Index (transmission) 2. Real-Time Interrupt (electronics) Real-Time IP Real-Time Kinematic Surveying (GSM) 1. Resistor–Transistor Logic (digital electronics) 2. Relative Transmission Level 3. Radio Television Luxemburg (broadcaster) 4. Runtime License 1. Ready To Manufacture 2. Runtime Monitor Radio–Television Manufacturers Association 1. Real-Time Markup Language (programming) 2. Rich Text Markup Language (programming) 3. Robotic Telescope Markup Language (programming) 4. Remote Telescope Markup Language (programming) Room Temperature MOS (semiconductors) Routing Table Maintenance Protocol (networking) Routing Transport Number (AT&T) Radio–Television News Directors Association Radio–Television News Directors Foundation Ring Tone No Reply Ready To Order—In Service Real-Time Operating System 1. Real-time Transport Protocol (IETF) 2. Rapid Transport Protocol (IETF) 3. Routing Table Protocol (Banyan Systems) 4. Release To Pivot 5. Radio E Televisao de Portugal (broadcaster) 1. Request-To-Send (RS232 signal) 2. Real-Time System 3. Reliable Transfer Service (OSI model)

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R

290

&

RTSE RTSP RTSU RTT

RTTU RTTY RTU

RTV RTX RU RUA RUBS RUC RUR RURL RUS RVA RVC RVDT RVE RVP RVPC RVPP RW RWhois RWI RWR RWT RWW RX RXD RXLEV

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Reliable Transfer Service Element (OSI model) Real-Time Streaming Protocol (IETF) Remote Terminal Sub-Unit 1. Round-Trip Time (ATM) 2. Radio and Telecommunications Terminal 3. Radio Transmission Technologies 4. Remote Trafﬁc Terminal Remote Trunk Test Unit Radio Teletype 1. Remote Terminal Unit 2. Remote Termination Unit 3. Remote Telemetry Unit 4. Right To Use Real-Time Video Request to Transmit 1. Request Unit 2. Response Unit 3. Rack Unit Remote User Agent (X.400) Resource Usage Billing System (Inmarsat) Resource Utilization Charge (Inmarsat) Repair, Update, and Refurbish (in industry) Relative Uniform Resource Locator Rural Utilities Service 1. Recorded Voice Announcement 2. Reactive Volt–Ampere (electrical engineering) Reverse Voice Channel Rotary Variable Differential Transducer Reference Vector Equalization Remote Voice Port Remote Voice Port Card Revenue Volume Pricing Plan (ﬁnance) 1. Read and Write (data storage) 2. Re-Writable (compact disks) 3. Remote Workstation Referral Whois (service) 1. Radio and Wire Integration 2. Radio-Wire Interface Radar Warning Receiver Recorder Warning Tone Read-While-Write (data storage) Receiver or Reception Receive-Data (RS-232 signal) Receiving Level on the air-interface (GSM)

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Rr

RXQUAL RZ RZ-AMI RZL

&

291

Receiving Quality on the air-interface (GSM) Return-to-Zero level (data encoding) Return-to-Zero level–-Alternate Mark Inversion (data encoding) Return-to-Zero Level (data encoding)

R

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Ss s S

S port S SEED S&F S&H S&R SC CNC CD SC CN//N S-ALOHA S-band S-BCCH S-CDMA S-DAB S-HTTP S-ISUP S-PCN S-Video

1. Symbol for second (of time) 2. Symbol for synchronous 1. Fixed-Satellite service (ITU-T) 2. Symbol for Strength of a signal 3. Symbol for Source (FETs) 4. Symbol for Siemens (unit of conductance) 5. Symbol for Surface area Slave port (FDDI Architecture) Symmetric Self Electro-optic Effect Device (switching) Store-and-Forward (messaging technique) Sample-and-Hold (PCM) Store-and-Retrieve (messaging technique) Signal plus Noise plus Distortion Signal plus Noise-to-Noise (ratio) Slotted ALOHA (protocol) Radio frequency band ranging from 1700 to 2360 MHz System Broadcast Control Channel Synchronous CDMA (access) Satellite Digital Audio Broadcasting Secure Hypertext Transfer Protocol Satellite ISDN User Part (SS7) Satellite Personal Communications Network Super Video 293

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S

294

&

S/C S/D S/DMS S/EOS S/H S/I S/MAIL S/MIME S/N S/P S/P DIF S/Q S/R S/S S/W S/WAN SA

SA-RR SAA SAAL SABER SABM SABME SAC

SACCH SACD SAD

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Signal-to-Cross talk (ratio) 1. Synchro-to-Digital (electronics) 2. Signal-to-Distortion (ratio) SONET Digital Multiplex System Standard Earth Observation Satellite Sample-and-Hold (ADC) Signal-to-Interference (ratio) Secure MAIL Secure Multipurpose Internet Mail Extension (e-mail attachments) Signal-to-Noise power (ratio) Serial-to-Parallel Sony and Philips Digital Interface Format Signal Quality Value (Intelsat) Symbol Rate (satellite TV broadcasting) Stop and Start (control character) Software Secure Wide Area Network 1. Service Agent 2. Source Address (LANs) 3. Section Adaptation Function (MUX) 4. Space Application and meteorology service (ITU-T) 5. Selective Availability (GPS) 6. Security Associations Section Adaptation for STM-1 Radio-Relay (MUX) 1. Supplemental Alert Adapter (AT&T) 2. Systems Application Architecture (IBM standard) 3. Standard Association of Australia Signaling ATM Adaptation Layer Situation Awareness Beacon Reply Set Asynchronous Balanced Mode command (X.25) Set Asynchronous Balanced Mode Extended (X.25) 1. Satellite Access Controller 2. Single Attached Concentrator (FDDI or CDDI) 3. Single Attachment Concentrator (FDDI) 4. Service Access Code (INs) 5. Special Area Code 6. STN-to-ATM Converter (MUX) 7. Shelf Alarm Card 8. Special Access Code (Inmarsat) 9. Subscriber Acquisition Cost Slow Associated Control Channel (GSM) Supper-Audio Compact Disk Serial Analog Delay Line

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Ss

SADL SAE SAF-TE SAFDT SAFE SAFEAct SAFENet SAG SAGE SAI SAIC SAID SAIL SAIS SAM

SAMA SamaCom SAN SANZ SAP

SAPI SAPS SAR

&

295

Synchronous Auto Dial Language (Racal Vadic) Society of Automotive Engineering SCSI Accessed Fault—Tolerant Enclosures Store And Forward Data Transmission Security And Freedom through Encryption (Act) Security And Freedom through Encryption Act Survivable Adaptable Fiber Optic Embedded Network (U.S. Navy) Self-Aligned Gate technology Semi-Automatic Ground Environment (air defense) 1. Serving Area Interface 2. Status Computer Application Interface (PBX switch) 3. Standards Australia International Ltd. Science Applications International Corporation (U.S.A.) Speech Activated Intelligent Dialing Stanford Artiﬁcial Intelligence Laboratory Section Alarm Indication Signal (MUX) 1. Self-Administered Maintenance (technology) 2. Serving Area Multiplex 3. Service Activation Manual (Inmarsat) 4. Switched Access with Multiplexer 5. Serial Access Memory 6. Subscriber Access Management Spread ALOHA Multiple Access Sama Communications Company (U.A.E.) 1. Storage Area Network (Cisco) 2. Satellite Access Node (Inmarsat) Standard Association of New Zealand 1. Service Access Point (Internet) 2. Satellite Access Provider (Satcom) 3. Service Advertizing Protocol (networking) 4. Session Announcement Protocol 5. Secure Audio Path (Microsoft) 6. Server Application Programming 7. Software Acquisition Planing 1. Service Access Point Identiﬁer (ISDN) 2. Speech Application Programming Interface Service Access Processing System 1. Search And Rescue (IMO) 2. Search And Replace (softwares) 3. Segmentation And Reassembly (ATM) 4. Synthetic-Aperture Radar (remote sensing) 5. Speciﬁc Absorption Rate (radio wave exposure)

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S

296

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

SARA SARAH SARBE SAREX SARFT SARM SARP SARPs SARSAT SART SARTS SAS

SASE SASG SASI SASL SASMO SASO SASS SAT

SATA SATAN SATCOM SatMex SatNav satphone SatVOD SAU

6. Surface-Array Recording (optical discs) Software Architecture for Reuse in Access Search And Rescue And Homing Search And Rescue Beacon Shuttle Amateur Radio Experiment State Administration of Radio, Film, and Television (China) Set Asynchronous Response Mode (X.25) Search And Rescue Processor Standards And Recommended Practices and Procedures (ICAO) Search and Rescue Satellite-Aided Tracking Search And Rescue Transponder Switched Access Remote Test System 1. Satellite Access Station (Inmarsat) 2. Survivable Adaptive System 3. Subscriber Alerting Signal 4. Single Attached Station (FDDI) 5. Simple Attachment Scheme 6. Silicon Asymmetrical Switch 7. Severely errored frame/Alarm indication Signal 8. Switched Access Service Speciﬁc Application Service Element Special Autonomous Study Group (ITU-T) Shugart Associates System Interface Simple Authentication and Security Layer (Internet) Syrian Arab Standardization and Metrology Organization Saudi Arabian Standards Organization Seasat-A Satellite Scatterometer (remote sensing) 1. satellite 2. Site Acceptance Tests 3. Stand-Alone Terminal 4. Subscriber Access Terminal (SMDS) 5. Supervisory Audio Tone (cellular networks) Serial ATA (speciﬁcation) Security Administrator Tool for Analyzing Networks (networking) Satellite Communications Satelites Mexicanos Satellite Navigation satellite telephone Satellite Video-On-Demand (service) Signaling Access Unit

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Ss

SAW SB SB-ADPCM SBAN SBAS SBC SBCA SBCF SBCS SBD SBE SBIC SBM SBO SBR SBRC SBS SBTS SBUR SBus SBUS SBUV SC

SC242 SC330 SCA

&

297

Surface Acoustic Wave (ﬁlter) 1. Synchronous Burst (GSM) 2. Secondary Body (orbit) 3. Signal Battery lead Sub-Band Adaptive Differential PCM (modulation) Services-oriented Building Area Network Satellite-Based Augmentation System (navigation) 1. Sub-Band Coding 2. Subsequent Bill Company 3. Single-Board Computer Satellite Broadcasting and Communications Association (U.S.A.) Single-Bit Cipher Feedback Satellite-Based Cellular System Smart Battery Data Society of Broadcast Engineers Shared Bus Interface Controller 1. Shared Buffer Memory (Alcatel) 2. Subnet Bandwidth Manager (signaling scheme) Service-Based Operator (VPNs) 1. Spaceborne Radar 2. Subsystem Backup Routing Subsystem Backup Routing Control 1. Satellite Base Station (Inmarsat) 2. Smart Battery System 3. Shift Bit Select Sistema Brasilero de Telecomunicaceos por Satellite (Brazil) Software Blocking/Unblocking Reception Sun Microsystems data Bus Software Blocking/Unblocking Sending Solar Backscatter Ultra-Violet Experiment (remote sensing) 1. Service Channel 2. Sub-Committee (ISO) 3. Suppressed Carrier (modulation) 4. scrambler 5. System Controller 6. Secondary Center (switching) Slot Connector 242 Slot Connector 330 1. Selective Call Acceptance 2. Signal Communications Axis (military) 3. Supplemental Communications Authority

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S

298

&

SCADA SCAI SCAM SCAN SCAP SCAPI SCbus SCC

SCCE SCCP SCCS SCD SCDMA SCDPI SCE SCEF Scelbi SCEP SCF SCFL SCH SCI

Comprehensive Glossary of Telecom Abbreviations and Acronyms

4. Subsidiary Communications Authorization (FCC regulation) 5. Sub-Carrier Adapter 6. Special Customer Arrangement (billing) Supervisory Control And Data Acquisition (remote control) Switch to Computer Applications Interface (protocol) SCSI Conﬁgured Automatically (scuzzy card devices) Switched Circuit Automatic Network Silicon Capacitive Absolute Pressure (sensor) SCSA Application Programming Interface SCSA bus (computer architecture) 1. Satellite Control Center (Inmarsat) 2. Satellite Communications Control System 3. Serial Communications Controller 4. Supercomputing Center 5. Specialized Common Carrier (AT&T) 6. Signal Channel Codec 7. Signal Communications Center 8. Smart-Card Chip 9. Space Communications Corporation (Japan) 10. Saudi Communications Commission (Saudi Arabia) 11. System Control Computer (CATV) 12. Standards Council of Canada Service Circuits Control Element Simple Client Control Protocol 1. Secure Code Control System 2. Switching Center Control System 1. Signaling Channel Descriptor 2. Source-Controlled Drawing (semiconductors) Synchronous CDMA (access) SCSA Device Programming Interface (computer architecture) 1. Service Creation Environment (INs) 2. Storage Control Element Service Creation Environment Function (INs) Scientiﬁc, electronic, and biological (early computers) Service Creation Environment Point (INs) 1. Shared Channel Feedback (wireless) 2. Service Control Facility Source-Coupled FET Logic (digital electronics) Synchronization Channel (GSM) 1. Scalable Coherent Interface (transmission) 2. Serial Communication Interface

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Ss

SCI-PHY SCIA SCICT SCIM SCL SCM

SCMS SCOI SCONUL scope SCORM SCOT SCOTS SCP

SCPC SCPC-FM SCPC-PSK SCPI SCR

SCR NRZ SCRL SCS

&

299

Saturn-Compliant Interface—Physical (protocol) Smart-Card Industry Association Supreme Council of ICT (Iran) Single-Chip Integration Module 1. Supervisory Control Language (programming) 2. Space-Charge Layer 3. Serial Clock 1. Subscriber Carrier Module 2. Service Circuit Module 3. Single-Chip Module 4. Station Class Mark (cellular networks) 1. Smart-Card Manufacturing System 2. Serial Copyright Management System (TV broadcasting) Standing Communications Operating Instruction Society of College, National and University Libraries (U.K. ICT) 1. oscilloscope 2. radarscope Shareable Content Object Reference Model Sealed Chips On Tape 1. Surveillance and Control of Transmission Systems 2. Switched Circuit-Oriented and Tracking System (MCI) 1. System Control Processor 2. Satellite Communications Processor (Northern Telecom) 3. Session Control Protocol 4. Service Control Point (INs) 5. Switching Control Point (GSM) 6. Signal Control Point (AINs) Single Channel Per Carrier SCPC Frequency Modulation SCPC Phase Shift Keying (modulation) Standard Commands for Programmable Instruments 1. Silicon-Controlled Rectiﬁer (semiconductors) 2. Sustainable Cell Rate (ATM) 3. System Clock Reference 4. SCSA Call Router Scrambled Non-Return-to-Zero (data encoding) Signal Corps Radio Laboratories 1. Silicon-Controlled Switch (semiconductors) 2. Structured Cabling System 3. Scattering Cross Section

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S

300

&

SCSA SCSI SCSI3 SCSR SCSU SCT SCTE ScTP SCTP SCU

SCVF SCWD SCXI SD SDAP SDARS SDBGA SDC SDCA SDCC SDCCH SDCD SDCM SDE SDF

Comprehensive Glossary of Telecom Abbreviations and Acronyms

4. Split Charging Service 5. Syrian Computer Society Signal Computing System Architecture Small Computer Systems Interface (scuzzy card) SCSI version 3 (scuzzy card) Single-Channel Signaling Rate Supervisory, Control & Switching Unit 1. System Control Terminal 2. Secretaria de Comunicaciones y Transportes (Mexico) 1. Society of Cable Television Engineers, Inc. (standards) 2. Serial Clock Transmit External (modems) Screened Twisted Pair (cabling) 1. Simple Computer Telephony Protocol (Internet) 2. Stream Control Transmission Protocol 1. System Control Signal Unit 2. Service Channel Unit 3. Signaling and Control Unit 4. Signaling Channel Unit 5. Selector Control Unit Single-Channel Voice Frequency Spontaneous Call Waiting Display Signal Conditioning Extension for Instrumentation 1. Space-Diversity (MUX) 2. Signal Degrade (MUX) 3. Starting Delimiter (LANs) Service Discovery Application Proﬁle (Bluetooth) Satellite Digital Audio Receiver Service Super-Dissipation Ball-Grid Array (microchips) 1. Synchro-to-Digital Converter 2. Security Database Computer Short Distance Charging Area Section Data Communication Channel (MUX) Stand-alone Dedicated Control Channel (GSM) Secondary Data Carrier Detect Serial Data Converter Modules 1. Synchronization Distribution Expander 2. Submission and Delivery Entity (X.400) 3. Secure Data Exchange (IEEE) 1. Specialized Database Functions 2. Standard Delay Format 3. Standard Delay File 4. Sub-Distribution Frame (trunk cable and LAN)

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Ss

SDH SDI SDIO SDIP SDK SDL SDLA SDLC SDLLC SDLT SDLVA SDM

SDMA SDMF SDMI SDN SDNP SDNS SDOs SDP

SDPC SDR

SDRAM SDRP

&

301

5. Service Data Function 6. Service Deﬁnition Function Synchronous Digital Hierarchy (MUX) 1. Serial Data Interface 2. SDH physical Interface 3. Synchronization Distribution Interface Secure Digital Input/Output Shrink Dual Inline Package (microchips) System Developer’s Kit (ICT) Speciﬁcation and Description Language (ITU-T) Successive Detection Log Ampliﬁer 1. Synchronous Data Link Control (protocol) 2. Software Description Language C Synchronous Data Logical Link Control (Cisco) Super DLT (tape data format) Successive Detection Log Video Ampliﬁer (microwave) 1. System Deﬁnition Manual (Inmarsat) 2. Sub-rate Data Multiplexing 3. Space Division Multiplexing 4. SuperNode Data Manager 1. Space Division Multiple Access 2. Station Detail Message Accounting Single Data Message Format Secure Digital Music Initiative 1. Software Deﬁned Network 2. Secondary Distribution Network Sustainable Development Networking Program (Bangladesh) Secure Data Network System Standard Development Organizations 1. Session Description Protocol (IETF) 2. Service Data Point (INs) 3. Service Delivery Point 4. Service Discovery Protocol (INs and Bluetooth) 5. Simple Discovery Protocol (Martin Hamilton) 6. SAR Data Provider (COMSAR) 7. Severely Disturbed Period (MUX) Synchronous Data Port Cluster 1. Software Deﬁned Radio (FCC) 2. Signal-to-Distortion Ratio 3. Session Detail Record 4. Special Drawing Right (billing) Synchronized Dynamic RAM (memory) Source Demand Routing Protocol

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S

302

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

SDS SDSAF SDSC SDSL SDT SDTI SDTP SDTV SDU SDUS SDV SDVB SDVN SDX SDXC SE .sea SEA–ME–WE SEA SEAC SEAL SEC

SECABS SECAM SECC SECO SECOR SECORD SECS SECTEL SED

1. Short Data Service (TETRA) 2. SDH Data Sub-network Switched Digital Services Applications Forum Standards and Data Services Committee 1. Symmetrical DSL (access) 2. Single-line DSL (access) 1. Structured Data Transfer 2. Service Description Table (broadcasting) Serial Data Transport Interface (data standard) Serial Data Transport Protocol Standard-deﬁnition Digital Television (broadcasting) 1. Service Data Unit (OSI model) 2. Satellite Data Unit (Inmarsat) Small-scale Data Utilization Station (remote sensing) Switched Digital Video (network architecture) Switched Digital Video Broadcasting Switched Digital Video Network Storage Data Acceleration (technology) Synchronous Digital Cross Connect (MUX) 1. Switching Element (ATM) 2. System Engineering 3. Software Engineering Name extension for self-extracting Macintosh archive ﬁles South East Asia–Middle East–West Europe (cable consortium) Self-Extracting Application Standard Eastern Automatic Computer Simple and Efﬁcient Adaptation Layer (ATM) 1. SDH Equipment Clock 2. Synchronous Equipment Clock 3. Security Encoding Computer 4. Service Entrance Cable Small Exchange Carrier Access Billing Speciﬁcations Sequential Color And Memory (French TV broadcast format) Single Edge Contact Cartridge (processor cartridge) Sequential Control Sequential Collation Of Range Secure voice CORD board (no more exists) Semiconductor Equipment and Material International’s Communications Standard Secure Telephone Smoke-Emitting Diode

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Ss

SEDFB SEED SEF SEFS SEI SEL Selcall SELED Selsyn SELV SEM

SEM-E SEMF SEMI SEP SEPP

SEPT SEQUEL SER SERN SERVORD SES

SESR SET SETA SETAMS

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303

Surface-Emitting Distributed Feedback (laser) Self-Electro-optic Effect Device (switches) 1. Support Entity Function 2. Severely Errored Framing (SONET) 3. Secure Explicit Forwarding (transmission) Severely Errored Framing Seconds 1. Software Engineering Institute 2. Secondary Electron Imaging 3. Shiraz Electronics Industries 1. selector (ATM) 2. Surface-Emitting Laser Selective calling Surface-Emitting Light-Emitting Diode Self-synchronous Safety Extra Low Voltage 1. Space Environment Monitor (remote sensing) 2. Scanning Electron Microscope 3. Synchronous Equipment Management (MUX) 4. Standard Electronic Module Standard Electronic Module E-type (avionics) Synchronous Equipment Management Function (MUX) Semiconductor Equipments and Materials International Symbol Error Probability 1. Secure Electronic Payment Protocol (bank card transactions) 2. Software Engineering for Parallel Processing (project) Signaling Endpoint Translator (SS7) Structured English Query Language (programming) Satellite Equipment Room Software Engineering Research Network Service Order 1. Ship Earth Station (Inmarsat) 2. Satellite Earth Station 3. Source End Station (ATM) 4. Severely Errored Seconds (MUX) Severely Errored Seconds Ratio (MUX) 1. Secure Electronic Transaction (protocol) 2. Secure Encryption Technology 3. Single Electron Transistor Southeastern Telecommunications Association System Engineering, Technical assistance And Management Services

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&

SETI SETS SEU SEVAS SF

SFBI SFC SFD SFDR SFG SFH SFINX SFM SFN SFQL SFR SFROM SFS SFT SFTA SFTP SFTS SFU SG

SG2 SGA SGCC SGCP SGDF SGI SGLS

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Search for Extraterrestrial Intelligence Synchronous Equipment Timing Source Single Event Upset Secure Voice Access System 1. Single-Frequency (signaling) 2. Secondary Frequency 3. Shared Frequency (ITU-T) 4. Super Frame 5. Signal Failure (MUX) Shared Frame-Buffer Interface 1. Switch Fabric Controller 2. Shannon–Farro Coding (data compression) 1. Saturation Flux Density 2. Start Frame Delimiter Spurious Free Dynamic Range (receiver) Simulated Facility Group Slow Frequency Hopping (GSM) Service for French Internet Exchange Synthesizer Filter Module Single-Frequency Network (broadcasting) Structured Full-text Query Language (programming) Socie´te´ Franc¸aise du Radiote´le´phone (French GSM operator) Smart Flash ROM (memory) Standard Frequency and Time signal Satellite (ITU) 1. Single-Frequency Tone 2. System Fault Tolerance Scalable Fault Tolerance Architecture Simple File Transfer Protocol Standard Frequency and Time Signal Store-and-Forward Unit (Inmarsat) 1. Super Group (MUX) 2. Study Group (ITU-T) 3. Signaling Gateway 4. Signal Ground Study Group 2 (ITU-T) Solder-Grid Array (microchips) Shahid Ghandi Communication Cable Company (Iran) Simple Gateway Control Protocol (Telcordia Technologies) Super-Group Distribution Frame Silicon Graphics Incorporated (company) Space Ground Link System

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Ss

.sgm .sgml SGML SGMP SGRAM SGSN SGW SHA SHARP SHDSL SHF SHG SHIELD SHIRAN SHOALS SHODOP shoran SHOT SHP SHPD SHPO SHR SHT SHTML SHVIA Si Si-APD Si–Ge Si3N4 SI

SIA

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305

The MS-DOS/Windows3.x name extension for SGML ﬁles Name extension for SGML ﬁles (computer) Standard Generalized Markup Language (programming) Simple Gateway Monitoring Protocol Synchronous Graphics RAM (memory) Serving GPRS Support Node (cellular networks) Service Gateway 1. Secure Hash Algorithm (digital signature) 2. Sidereal Hour Angle (earth rotation) 3. Sample-and-Hold Ampliﬁer (ADC) Self-Healing Alternate Route Protection (SONET) Single-pair High-bit-rate DSL (access) Super-High Frequency (3–30 GHz range) Second Harmonic Generator Silicon Hybrids with Infrared Extrinsic Long-wavelength Detector S-band High-accuracy Ranging Scanning by Hydrographic Operational Airborne Lidar Survey Short-range Doppler short-range aid to navigation Society for the History Of Technology Signaling Handoff Point (SS7 networks) Sample and Hold Phase Detector State Historic Preservation Ofﬁcer Self-Healing Ring 1. Short Hold Time 2. Suppressed High-level differential Transfer (circuit) Server-parsed HTML (programming) Satellite Home Viewer Improvement Act Silicon (semiconductors) Silicon Avalanche Photo Diode (semiconductors) Silicon–Germanium (semiconductors) Silicon Nitride (semiconductors) 1. Shift-In (character control code) 2. Service Indicator (SS7) 3. Systeme´ International D’unites (French) 4. International System of Units 5. Semi-Insulator 1. Satellite Industry Association (standards organization) 2. Securities Industry Association 3. Semiconductor Industry Association (U.S.A.)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

SIBB SIBH SiC SIC

SICL SID

SIDN SIDR SIF

.sig SIG SIGCOMM SiGe SIGGRAPH SIGINT SII SIIA SILC SILO SILS SIM SIMD SIMM SiN SINAD SINCGARS

Service Independent Building Blocks (Telcordia Technologies) Semi-Insulated Buried Heterostructure (laser) Silicon Carbide (semiconductors) 1. System Interface Cluster 2. Station Identiﬁcation Code 3. Selectively Implanted Collector 4. Service Initiation Charge 5. Service Information Compiler (TV broadcast) 6. Standard Industrial Classiﬁcation (numbering code) Standard Instrument Control Library 1. System Identiﬁer 2. Security ID 3. Silence Descriptor (GSM) 4. Society for Information Display Security Industry Digital Network SES ID Record 1. Standard Image Format (video images) 2. SONET Interoperability Forum (U.S. standards organization) 3. Signaling Information Fields (SS7) Name extension for the e-mail signature ﬁles (computer) 1. signal (transmissions) 2. Special Interest Group (SDR Forum) 3. SMDS Interest Group Special Interest Group on data Communications Silicon–Germanium (semiconductors) Special Interest Group on Computer Graphics Signal Intelligence System Integration Interface (NTT) Software & Information Industry Association Selective Incoming Load Control Signal Intercept from Low Orbit Standard for Interoperable LAN Security (IEEE) 1. Subscriber Identity Module (GSM) 2. Single Interface Module (NEC) 3. Society for Information Management Single-Instruction, Multiple-Data (processor instruction) Single In-line Memory Module (Macintosh PCs) Silicon Nitride (semiconductors) Signal-to-Noise-And-Distortion (ratio) Single-Channel Ground and Airborne Radio Systems

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Ss

SingTel SinoSat SINPO SINS SiO

SIP

SIPO SIPP SIR

SIS SISO .sit SIT SITA SIVR SK Telecom SKAM SKED SKIP SKU SKW SL

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307

Singapore Telecommunications Ltd. (company) Sino Satellite Communications (company) Signal strength, Interference, Noise, Propagation, and Overall quality (signal quality rating system for radio signals) Ship’s Inertial Navigation System 1. Silicon Oxide (semiconductors) 2. Serial Input and Output (port) 3. Scientiﬁc or Industrial Organization (ITU) 4. Service Information Octet (SS7) 1. SDMS Interface Protocol 2. Session Initiation Protocol 3. Single Inline Package (microchips) 4. SMDS Interface Protocol Serial-In Parallel-Out (port) 1. Simple Internet Protocol Plus 2. Single Inline Pinned Package (microchips) 1. Sustained Information Rate (SMDS) 2. Substrate-Incident Recording 3. Serial Infrared data transmission system (HewlettPackard) 4. Speaker Independent Recognition 5. Signal-to-Interference Ratio 6. Surface Insulation Resistance 7. Stepped Impedance Resonator 1. Sound-In-Sync (transmission) 2. Standardiseringen I Sverige (Sweden) Soft Input–Soft Output technique (FEC) Name extension for a Macintosh ﬁle compressed with StuffIT 1. Simple Internet Transition (protocol) 2. Satellite Interactive Terminal 3. Special Information Tone Socie´te´ Internationale de Te´le´communication Aeronautique Speaker Independent Voice Recognition South Korea Telecom (company) Skills, Knowledge, Access, and Motive Schedule (Morse code transmissions) Simple Key management for Internet Protocol Stock-Keeping Unit (E-Commerce) Satellite-Keeping Window (satcom) 1. satellite 2. Synchronous Line

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&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

SLA SLAM SLAR SLARP SLC

SLCC SLD SLDRAM SLE SLED SLEE SLF SLI SLIC Slicc SLICE SLIP SLIP/PPP SLM

SLMQW SLOs SLP SLR

3. stripline 4. Session Layer Service Level Agreement (contracts) Scanning Laser Acoustic Microscope Side-Looking Airborne Radar Serial Line Address Resolution Protocol (Cisco) 1. Subscriber Loop Carrier 2. Subscriber Line Charge 3. Signaling Link Code (SS7) 4. Straight-Line Capacitance (electronics) 5. System Life Cycle 6. Simple Line Code (transmission) 7. Single Layer Ceramic 8. Surface Laminar Circuit 1. Subscriber Line Carrier Circuit 2. Subscriber Loop Carrier Circuit 1. Super Luminescent Diode 2. Secure Level Debugger Sync Link Dynamic RAM (memory) Satellite Link Emulator 1. Single Large Expensive Disk 2. Single Large Expensive Drive 3. Superluminescent LED Service Logic Execution Environment (AINs) 1. Super Low Frequency 2. Straight-Line Frequency (electronics) Service Logic Interpreter (INs) 1. Subscriber Line Interface Circuit (VoIP) 2. Subscriber Line Interface Card 3. Standard Linear Integrated Circuit (electronics) Slightly larger than IC carrier (microchips) Simulation Language for Integrated Circuit Emphasis Serial Line Internet Protocol Serial Line Internet Protocol to Point-to-Point Protocol 1. Service Level Management 2. System Load Module 3. Signal Label Mismatched (SONET) 4. Spatial Light Modulator 5. Single Longitudinal Mode (laser) Strained Layer Multiple Quantum Well Service Level Obligations (contracts) 1. Service Location Protocol (IETF) 2. Service Logic Program 1. Send Loudness Rating

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Ss

SLS SLSA SLSI SLT SLTE SLW SM

SMA SMAE SMAP SMART SMAS SMASE SMATV SMB SMBus SMC

SMCC SMD SMDA SMDI

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309

2. Source Local Reference (SS7) 3. Service Level Reporter 1. Signaling Link Selection code (SS7) 2. Softlanding Linux System Single-Line Switching Apparatus Super Large-Scale Integration (microchips) 1. Single-Line Telephone 2. Subscriber Line Terminal 3. Subscriber Line Test Subscriber Line Terminal Equipment Straight-Line Wavelength (electronics) 1. Switch Module 2. Service Module (ADSL) 3. Single Mode (optical ﬁber) 4. Synchronous Multiplexer (MUX) 5. Spectrum Management (ITU-T) 6. Session Management 1. Spectrum Management Agency 2. Semiconductor Manufacturers Association (U.K.) 3. Surface-Mounted Assembly System Management Application Entity Service Management Access Point (INs) 1. Self-Monitoring Analysis and Reporting Technology 2. Stress-Marginality and Accelerated-Reliability Testing 3. Standard Module Avionics Repair and Test (software) Switched Maintenance Access System System Management Application Service Entity Satellite Master-Antenna Television 1. Server Message Block (networking protocol) 2. Shared-Memory Buffer System Management Bus (Intel standard) 1. System Management Center 2. Standard Management Committee 3. Surface-Mount Components (electronics) 4. SAR Mission Coordinator (COMSAR) 5. Subscriber Management Center Sun Microsystems Computer Company 1. Surface-Mount Device (electronics) 2. Solder Mask Deﬁned 3. Storage Module Drive Station Message Detail Accounting 1. Station Message Desk Interface (data link) 2. Simpliﬁed Message Desk Interface (data link)

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SMDR SMDS SMDSU SME SMEMA SMF SMFA SMG SMI

SMII SMIL SMIP SMIS SMM SMMR SMMS SMN SMO SMOBC SMOP SMP

SMPGA SMPI SMPP SMPS SMPTE SMPTE SMR SMRP

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Station Message Detail Recording Switched Multimegabit Data Services (MANs) Switched Multimegabit Data Service Unit 1. Signaling Management Equipment 2. Security Management Entity 3. Small-to-Medium Enterprise Surface-Mount Equipment Manufacturers Association 1. Service Management Function (TMN) 2. Single-Mode Fiber 3. Sub-Multiframe (MUX) Speciﬁc Management Function Area 1. Super Master Group (MUX) 2. Special Mobile Group (former name of GSM) 1. Structure of Management Information 2. Small- and Medium-sized Industries 3. System Management Interrupts (power) 4. Sample Matrix Inversion Serial Media Independent Interface Synchronized Multimedia Integrated Language (programming) Strategic Management Information Plan Society for Management Information Systems System Management Mode (power) Scanning Multichannel Microwave Radiometer Spatial Metadata Management System Synchronous Management Network Stabilized Master Oscillator Solder Mask Over Bare Copper Small Matter Of Programming 1. Service Management Point (INs) 2. Symmetric Multiprocessing (ICT) 3. SCSA Message Protocol 4. Simple Management Protocol 5. Sub-Miniature Push-on (connectors) 6. Surface-Mount Package (microchips) Surface-Mount Pin-Grid Array (microchips) SCSA Message Protocol Interface Short Message Peer-to-Peer (networking protocol) Switched-Mode Power Supply Society of Motion Picture and Television Engineers Society of Motion Picture and Television Engineers (U.S.A.) Specialized Mobile Radio Simple Multicast Routing Protocol

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Ss

SMRT SMS

SMS-MO SMS-MT SMS-PP SMSA SMSC SMSCB SMSCH SMSK SMSR SMT SMTA SMTP SMU SMU-R SMUG SN

SNA SNAC SNACP SNADS SNAP SNC SNC/I SNC/N

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311

1. Single Message-unit Rate Timing 2. Surface-Mount and Reﬂow Technology 1. Short Message Service (GSM) 2. Satellite Multiservice 3. Subscribers Management System 4. Service Management System (INs) 5. SDH Management Sub-network SMS Mobile Originated (GSM) SMS Mobile Terminated (GSM) SMS Point-to-Point (GSM) Standard Metropolitan Statistical Area (FCC) Short Message Service Center (GSM) SMS Cell Broadcast (GSM) Short Message Service Channel (GSM) Serial MSK (modulation) Side-Mode Suppression Ratio (ﬁber optics) 1. Surface-Mount Technology (electronics) 2. Simultaneous Multitasking 3. Station Management (FDDI Architecture) 1. Single-line Multiextension Telephone Apparatus 2. Surface-Mount Technology Association Simple Mail Transfer Protocol (Internet) 1. Subscriber Carrier Module-100 URBAN 2. Surface-Measure Unit Subscriber Carrier Module-100 URBAN—Remote Spokane Microcomputer User Group 1. Switching Node 2. Services Node (AINs) 3. Subscriber Number 4. Sequence Number (ATM) 1. Systems Network Architecture (IBM) 2. Scalar Network Analyzer 3. SDH Network Aspects (MUX) 1. Single Network Access Code (Inmarsat) 2. SMS/800 Number Administration Committee SNA Control Protocol SNA Distribution Services (IBM) 1. Sub-Network Access Protocol (IEEE) 2. Systems for Nuclear Auxiliary Power Sub-Network Connection (MUX) Sub-Network Connection with Inherent Monitoring (MUX) Sub-Network Connection with Non-intrusive Monitoring (MUX)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

SNCP .snd SND SNDCF SNDCP SNEK SNES SNet SNET SNG SNI SNIR SNM SNMP SNOBOL SNOC SNPA SNPP SNR SNRM SNVT SO

SO-DIMM SOA SOAP SOB SOC

SoD SOD SOF SOFAR SOG SOH

1. Satellite Network Control Processor 2. Sub-Network Connection Protection (MUX) Name extension for Sun and Next Machine audio ﬁles send (cellular language) Sub-Network Dependent Convergence Function Sub-Network Dependent Convergence Protocol Satellite Network node computer Special Network Exchange Small SONET Network (Northern Telecom) Southern New England Telephone Corporation Satellite News Gathering system 1. System Network Interconnection (IBM) 2. Subscriber Network Interface (SMDS) Signal-to-Noise plus Interference Ratio (signal quality) Sub-Network Management Simple Network Management Protocol (networking) String-Oriented Symbolic Language (programming) Satellite Network Operations Center Sub-Network Point of Attachment Simple Network Paging Protocol (IETF) 1. Signal-to-Noise Ratio (signal quality) 2. Sub-Network Router 3. Saved Number Redial Set Normal Response Mode (command) Standard Network Variable Type 1. Shift Out (character control code) 2. Serving Ofﬁce 3. Serial Output 4. Small-Outline Small Outline-Dual In-line Memory Module (Maintosh PCs) Semiconductor Optical Ampliﬁer Simple Object Access Protocol Small-Outline Butt-leaded package (microchips) 1. System Operator Console 2. Statement Of Compliance 3. State Of Charge 4. System-On-a-Chip (microchips) Service-on-Demand Source-Over-Drain (FETs) Start Of Frame (TDMA) Sound Fixing And Ranging Source-Over-Gate (FETs) 1. Start Of Header (control character)

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Ss

SOHO SOI SOIC SOJ SOLA SOLAS Solion SOLR SOLT SOLV SOM SOMO SON sonar SONET SONIA SOP SOPC SOR SORA SORF SORMF SOS SOSCARD SOSIC SOSTEL SOSUS SOT SOTF SOTMF SOVA SP

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313

2. Section Overhead (MUX) 1. Small Ofﬁce, Home Ofﬁce (computer market) 2. Solar and Heliospheric Observatory 1. Signal Operating Instruction 2. Silicon-On-Insulator (semiconductors) 3. Second-Order Intercept Small-Outline Integrated Circuit package (microchips) Small-Outline ICs with J-leads (microchips) Short, Open, Load, and Air-capacitor Safety Of Life At Sea (IMO convention) Solution ION (electrochemical device) Short-Open-Line-Reciprocal (calibration) Short-Open-Load-Through (calibration) Solenoid Value (electronics) 1. Start Of Message 2. System Object Model (IBM architecture) Small Ofﬁce, Medium Ofﬁce (computer market) Service Order Number (local exchange carrier) sound navigation and ranging Synchronous Optical Network (standard) Sun Microsystems, Oracle Corp., Netscape Corp., IBM, Apple, Inc. 1. Standard Operating Procedure 2. Small-Outline Package (microchips) System On a Programmable Chip (microchips) Start Of Record Satellite-Oriented Resource Allocation 1. Start Of Receive Frame 2. Small-Outline Radio Frequency (microchips) Start Of Receive Multiframe 1. Save Our Souls or Ship (international distress signal) 2. Silicon-On-Sapphire (semiconductors) Secure Operating System CARD Silicon-On-Sapphire Integrated Circuit (semiconductors) Solid-State Electronic Logic (digital electronics) Sound Surveillance System Small-Outline Transistor (semiconductors) Start Of Transmit Frame Start Of Transmit Multiframe Soft-Output Viterbi Algorithms 1. Service Provider 2. Support Processor 3. Stream Protocol

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314

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

SP3 SP3T SPA

Spacecom SPACH SPADATS SPADE SPAG SPAM SPAN SPAP SPARC SPARS SPATA SPB SPBX SPC

SPCAS SPCM SPCP SPCS SPD SPDIP SPDM SPDT SPDU SPE

4. Signal Processor 5. Span Processor 6. Signaling Point 7. Signal Present 8. Switch Port (Ericson) Third-order Suppression Single-Pole 3 Throw (switches) 1. Special Photographic Area 2. Software Publishers Association (U.S. standards organization) 3. Shared Printer Access (ISDN) Space Communications Corporation SMS messaging, Paging, and Access response Channel Space Detection And Tracking System SCPC PCM Multiple Access Demand—assignment Equipment Standard Promotion and Application Group (Europe) Specialized Automated Mail (e-mail) Switched Port Analyzer (Cisco) Secure Password Authentication Protocol Scalable Processor Architecture (Sun Microsystems) Society of Professional Audio Recording Studios Speech And data 1. Satellite Processor Board 2. Synchronous Port Block (MUX) Satellite Private Branch Exchange 1. Stored Program Control (telephone system) 2. Semi-Permanent Connection 3. Signaling Point Code (SS7) 4. Statistical Process Control SPC Allocation Service Subscriber PCM (modulation) Spectrum Cellular error-correction Protocol Stored Program Controlled Switch 1. Security Production Development 2. Serial Presence Detect (SDRAM memories) 3. spreader Shrink Plastic Dual Inline Package (microchips) Scalable Polynomial Delay Model Single-Pole Double-Throw (switches) Session Protocol Data Unit 1. Semi-Public Environment 2. Switch Processing Element 3. Signal Processing Element

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Ss

spec SPEC SPECT SPF SPG SPHIGS SPI

Spice SPID SPIE SPIN SPINA SPINI SPIRIT

SPIROU SPISN SPITE SPKR SPL SPLD SPLIC SPM

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315

4. Synchronous Payload Envelope (MUX) speciﬁcation 1. Speech Predictive Encoded Communication 2. Standard Performance Evolution Corporation Single-Photon Emission-Computed Tomography (medicine) 1. Shortest Path First (routing algorithm) 2. Stateful Packet Filtering Signal Processing Gain Simple PHIGS 1. Service Provider Interface 2. Serial Peripheral Interface (Motorola) 3. Serial-to-Parallel Interface (electronics) 4. Security Parameters Index 5. Synchronous Public Input 6. Synchronous Pixel Interface 7. SDH Physical Interface (MUX) 8. Stateful Packet Inspection (ﬁrewall monitoring system) Simulation program with integrated circuits emphasis 1. Service Proﬁle Identiﬁer (ISDN) 2. Service Protocol Identiﬁer (ISDN) 1. Society of Photometric Industry Engineers 2. Society of Photo-optical Instrumentation Engineering Service Provider Identiﬁcation Number Subscriber Personal Identiﬁcation Number Access Subscriber Personal Identiﬁcation Number Intercept 1. Special Purpose Integrated Remote Intelligence Terminal 2. Secure Planning and Integrated Resources for Information Technology (PHS of Japan) Signalization Pour l’ Interconnexion des Reseaux Ouverts Security Protocols to explore security Issues in Sensor Networks Switching Processing Interface Telephony Event speaker Sound Pressure Level (sound power) Simple Programmable Logic Device (digital electronics) Special Purpose Linear Integrated Circuit (electronics) 1. Self-Phase Modulation 2. Satellite Propulsion Module 3. Spectrum Peripheral Module

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&

SPMT SPN SPNA SPNE SPNI SPOC SPOI SPOOL SPOT SPP

SPRE SPS

SPST SPT SPTS SPU SPUD SPUDT SPX Sq SQAM SQC SQCIF SQE SQFP

Comprehensive Glossary of Telecom Abbreviations and Acronyms

4. Service Provider Messages 5. Subscriber Private Meter 6. Scanning Probe Microscope Single-Pole Multiple-Throw (switches) 1. Service Provider Networks 2. Subscriber Premises Network Secure Public Networks Act (U.S. Senate) Signal Processing Network Equipment Service Provider Network Identiﬁer 1. SAR Point Of Contact (COMSAR) 2. Single-Point-Of-Contact Signaling Point Of Interface (SS7) Simultaneous Peripheral Operations Online 1. Sequential Proxy Optimization Technique 2. Secondary-location Point of Termination 3. Smart Personal Object Technology (Microsoft) 1. Service Provision Point (IN) 2. Scalable Parallel Processing (multiprocessing architecture) 3. Sequenced Packet Protocol 4. Signal Processing Platform 5. Serial Port Proﬁle (Bluetooth) 1. Special Preﬁx code 2. Satellite Position Reporting Equipment 1. Standard Positioning Service (GPS) 2. Signaling Protocol and Switching 3. Sound-Processing Software 4. Standby Power System 5. Samples Per Second Single-Pole Single-Throw (switches) Stationary Plasma Thruster Single-Program Transport Stream (MPEG-2) Satellite Position Uncertainty Small Planned Unit Development Single-Phased Uni-Directional Transducer Sequenced Packet Exchange (protocol) Square (SI Units) 1. Staggered Quadrature Amplitude Modulation 2. Sound Quality Assessment Material Statistical Quality Control (products) Sub-Quarter Common Intermediate Format (video compression) Signal Quality Error (Ethernet) Shrink Quad Flat Pack (microchips)

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Ss

SQL SQPSK SQUID sr SR

SRA SRAM SRAPI SRB SRC SRD SRD Industries SRDC SRDM SRE SREJ SRES SRF SRGF SRGP SRI SRL SRM

SRMS SRO SRP

&

Structured Query Language (databases) Staggered Quadrature PSK (modulation) Superconducting Quantum Interference Device steradian 1. Set and/or Reset (ﬂip-ﬂops) 2. Scanning Radiometer 3. Spectral Responsivity 4. Shift Register (digital electronics) 5. Secondary Radar 6. Speech Recognition 7. Source Routing 8. Selective Repeat System Reliability Architecture Static RAM (memory) Speech Recognition Application Programming Interface 1. Secondary Reference Burst 2. Source Route Bridging (LANs) 3. Synchronization Reference Burst 1. Strategic Review Committee (ETSI) 2. Stupid Rich Customer (telecom products) 3. Semiconductor Research Corporation Super-Radiant Diode Saamaaneh Rahe Dour Industries (Iran) Sub-Rate Digital Cross connect Sub-Rate Data Multiplexer Send Reference Equivalent Selective Reject Signed Response (GSM) 1. Special Resource Function (AINs) 2. Speciﬁcally Routed Frame Speech Recognition Grammar Format Simple Raster Graphics Package (software) Sorry (Morse code transmission) 1. Structured Return Loss (cable) 2. Shift Register Latch (microchips) 1. Sub-Rate Multiplexing 2. Service Resource Management 3. Selective Ringing Module 4. Signaling Route Management Service Request Management System Standards Related Organization 1. Spatial Reuse Protocol (ﬁber optics) 2. Source Routing Protocol

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317

S

318

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

SRR SRS

SRSC SRT SRTS SRTT SRU SS

SS-CDMA SS-LORAN SS-TDMA SS1 SS2 SS7 SSA SSAC13 SSAC15 SSAP SSAS SSAT SSB SSB-SC SSB/AM SSBW SSCC SSCF SSCOP SSCP SSCS SSCSG

3. Suggested Retail Price Search and Rescue Region (COMSAR) 1. Space Research Service 2. Statistical Repository System 3. Shared Registry System 4. Stimulate Roman Scattering (optical ﬁber) Silkroad Refractive Synchronization Communication 1. Station Ringing Transfer 2. Source Route Transparent bridging (Ethernet, Token Ring) 1. Synchronous Residual Time Stamp (clock recovery) 2. Secondary Request To Send Saco River Telegraph & Telephone Company Search and Rescue Unit (COMSAR) 1. Supplementary Services (GSM) 2. Spread Spectrum 3. Satellite Switching 4. Selection Signal 5. Subscriber Station Spread-Spectrum CDMA (access) Skywave-Synchronized LORAN 1. Spread-Spectrum TDMA (access) 2. Satellite-Switched TDMA (access) Signaling System Number 1 Signaling System Number 2 Signaling System Number 7 Serial Storage Architecture (IBM) Signaling System Alternating Current No. 13 Signaling System Alternating Current No. 15 Session Service Access Point Ship Security Alarm System (IMO) System Software Acceptance Test 1. SingleSideband (modulation) 2. Superframe Short Burst Single-Sideband Suppressed Carrier (modulation) Single-Sideband operation with Amplitude Modulation Surface-Skimming Bulk Wave Selective Sequence Control Computer (IBM) Service Speciﬁc Coordination Function (ISDN) Service Speciﬁc Connection-Oriented Protocol (ATM) 1. Service Switching and Control Point (INs) 2. System Services Control Point (networking) Service Speciﬁc Convergence Sublayer (ATM) Spread-Spectrum Code Sequence Generator

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Ss

SSD

SSDA SSDH SSDR SSE SSET SSF SSFDC SSG SSH SSI SSID SSL SSM SSMA SSMF SSML SSMM SSMP SSMS SSN SSO SSOG SSOP SSP

SSPA SSPE SSPI

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319

1. Shared Secret Data 2. Service Selection Dashboard (Cisco) 3. Simultaneous Signal Detection 4. Solid-State Disk 5. Solid-State Drive 6. Stop–Start Distortion Sequential Similarity Detection Algorithm (remote sensing) Satellite SDH Stop–Start Distortion Ratio Streaming SIMD Extensions (Intel processors) Switching System Exchange Termination 1. Service Switching Function (INs) 2. Sub-Service Field (SS7) Solid-State Floppy Disk Card Small-Signal Gain 1. Secure Shell 2. Security Server Host 3. Simultaneous Sample-and-Hold (data acquisition) 1. Small-Scale Integration (microchips) 2. Server Side Includes (code) Ships’ Station Identiﬁcation number Secure Sockets Layer (Internet) 1. Second Surface Mirror 2. Synchronous Status Message Spread-Spectrum Multiple Access Standard Single-Mode Fiber Speech Synthesis Markup Language (programming) Solid-State Mass Memory Simple Screen Management Protocol Space Spectrum Monitoring System 1. Subsystem Number (SS7) 2. Station Serial Number 1. Single Sign-On (networking) 2. Sun Synchronous Orbit (Sun Microsystems) Satellite System Operations Guide (Intelsat) Shrink Small-Outline Package (microchips) 1. Service Switching Point (INs) 2. Signal Switching Point (AINs) 3. Storage Service Provider 4. Service Signaling Point Solid-State Power Ampliﬁer Single Solid-Phase Epitaxy Society of Satellite Professionals International (U.S.A.)

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S

320

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

SSR

SSRM SSRP SSRT SSS SST

SSTL SSTO SSTP SSTV SSU

SSUC SSUPS SSUS SSV ST

ST2C ST-Bus STA STALO STAR STAR TAP STATMUX

1. SES Status Record 2. Solid-State Relay (electronics) 3. Secondary Surveillance Radar 4. Surface Search Radar 5. Scalable Sampling Rate Space Segment Resources Management Simple Server Redundancy Protocol Sub-Second Response Time Switching Subsystems 1. Spread-Spectrum Technology 2. Solid-State Technology 3. Simultaneous Self-Test 4. Standard Star Tracker (remote sensing) 1. Stub-Series-Terminated Logic (digital electronics) 2. Surrey Satellite Technologies Ltd (U. K.) Single Stage To Orbit Switched Services Transport Protocol Slow-Scan Television 1. Subsequent Signal Unit 2. Synchronization Source Unit 3. Stratospheric Sounding Unit 4. Session Support Utility Space Segment Utilization Charge Solid-State UPS (power) Solid Spanning Upper Stage Sub-Supervisory equipment 1. Signaling Terminal 2. System Test 3. start (signal) 4. Stufﬁng Table (broadcasting) 5. Scheduled Transfer 6. Straight Tip (connectors) Stream protocol version 2C Serial Telecom Bus 1. Spanning Tree Algorithm (IEEE) 2. Science and Technology Agency 3. Special Temporary Authority Stablized Local Oscillator (electronics) 1. Speech Technology And Research Laboratory 2. Special Telecommunications Action for Regional Development Science, Technology, And Research Transit Access Point Statistical Multiplexer

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Ss

STB STC

STD

STDM STE

STECS STEP STEREO STFS STG STI STICI STID STK STL

STM STM-0 STM-1 STM-4 STM-16

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321

Set-Top Box (integrated TV receiver decoder) 1. Sub-Technical Committee (ETSI) 2. Society of Telecommunications Consultants 3. Saudi Telecoms Company (Saudi Arabia) 4. System Time Clock 5. Sensitivity Time Control 6. Supplemental Type Certiﬁcation (aviation) 1. Subscriber Trunk Dialing (telephone exchange) 2. Synchronous Time Division 3. standard 4. State Transition Diagram 1. Statistical Time-Division Multiplexing (transmission) 2. Synchronous Time-Division Multiplexing (transmission) 1. Spanning Tree Explorer 2. Special Test Equipment 3. Section Terminating Equipment (SONET) 4. Syrian Telecommunications Establishment (Syria) Synchronous Terminal Equipment Control System Short-Term Error Performance Solar Terrestrial Relations Observatory Standard Time and Frequency Signal (service) Scale To Gray (graphics) 1. Secondary Terrestrial Interface 2. Speech Transmission Index Self-Teaching Imperative Communicating Interface (E-learning) Service Termination Identiﬁer (ISDN) SIM Toolkit (GSM) 1. Standard Template Library (CCC programming) 2. Studio-to-Transmitter Link (broadcast) 3. Schottky Transistor Logic (digital electronics) 4. Standard Telegraph Level 1. Synchronous Transport Module (MUX) 2. Service Trafﬁc Management Synchronous Transport Module level-0 (51.48 Mb/s MUX) Synchronous Transport Module level-1 (155.52 Mb/s MUX) Synchronous Transport Module level-4 (622.080 Mb/s MUX) Synchronous Transport Module level-16 (2488.32 Mb/s MUX)

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S

322

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

STM-N STM-NC STM-RR STMR STN STOP STP STP-A STPC STR STRADIS STRICOM STRIFE STS

STS-1 STS-3 STS-n STSC STSK STSP STT STTL STU STU-III STUN STV STW STX

Synchronous Transport Module level-N Synchronous Transport Module level-N Concatenated Synchronous Transport Module for Radio-Relay (MUX) Sidetone Masked loudness Rating Super-Twisted Nematic display (LCD) Satellite Tracking of Polluters 1. Shielded Twisted Pair (cable) 2. Signaling Transfer Point (SS7) 3. Spanning Tree Protocol (Ethernet switching) Shielded Twisted Pair-A Southwest Technical Products Corporation Symbol Timing Recognition Structured Analysis, Design, and implementation of Information Systems Simulation, Training, and Instrumentation Command (U.S. Army) Stress and life (testing) 1. Satellite Transportation System 2. Space Transportation System 3. Synchronous Transport Signal (SONET) 4. Shared Tenant Services Synchronous Transport Signal 1 (SONET) Synchronous Transport Signal 3 (SONET) Synchronous Transport Signal n (SONET) 1. Software Technology Support Center 2. Station-To-Station Connectivity 3. Scandinavian Telecommunications Satellite Comittee Scandinavian Telecommunications Satellite Committee Solar Terrestrial Science Programme (remote sensing) 1. Secure Transaction Technology (ICT) 2. Set-Top Terminal Schottky Transistor-to-Transistor Logic (digital electronics) 1. Secure Telephone Unit 2. Set-Top Unit (TV reception) Secure Telephone Unit 3rd generation Serial Tunnel 1. Subscriber TV 2. Subscription TV Surface Transverse Wave (microwave) 1. Start of Text (control character) 2. Start Transmission

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Ss

SU SUB subNMS SUERM SUI SUIRG SUMAC SunOS SUPARCO SUPV SUS SUT SV SVC

SVCC SVCD SVD SVGA SVHS SVHS-C SVID SVIIX SVN SVOD SVP SVPC SVS SVU Sw SW

SWAC

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323

1. Signaling Unit (RF modem) 2. Subscriber Unit 3. Service User substitute (character control code) sub-Network Management System Signal Unit Error Rate Monitor (SS7) Speech User Interface (multimedia) Satellite Users Interference Reduction Group Super-HIPPI Media Access Controller Sun Microsystems’ variety of Operating System Space & Upper Atmosphere Research Commission (Pakistan) Supervision 1. Station Unit Sharing 2. Silicon Unilateral Switch 1. System Under Test (ATM) 2. Service User Table Supervisory Unit 1. Switched Virtual Circuit (ATM and frame relay) 2. Switched Virtual Connection 3. Smart Virtual Circuit 4. Soft Virtual Circuit Switched Virtual Channel Connection Super Video Compact Disk Simultaneous Voice and Data Super Video Graphics Adapter (800!600 pixels monitor) Super VHS (video format) Super VHS—Compact (video format) System V Interface Deﬁnition Silicon Valley International Internet Exchange Subscriber Veriﬁcation Number (ISDN) Standard Video-On-Demand Surge Voltage Protector Switched Virtual Path Connection 1. Short Voice Service (GSM) 2. Switched Voice Service Siran Virtual University (Syria) switch 1. Short Wave (radio broadcast) 2. Standing Wave 3. Station Wire 4. switch Standard Western Automatic Computer

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S

324

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

SWACT SWAG SWAN SWAP SWATS SWC SWDL SWEDAC SWHK SWIFT SwiftBB SWIGs SWIP SWIR SWL SWLing SWLs SWM SWR SWS SWVR SXGA SXGAC C SXS SYLK ﬁle symlink SYN Sync synchro synth .sys sysop SYSREQ systray SYU

Switch of Activity Scientiﬁc Wild Ass Guess Satellite WAN (networking) 1. Simple Workﬂow Access Protocol 2. Shared Wireless Access Protocol Standard Wireless AT command Set Service Wire Center Software Download Swedish Board for Technical Accreditation Switch Hook Society for Worldwide Interbank Financial Telecommunications Swift64 Broadband (Inmarsat) Special Working Interest Groups Shared Who is Project (ARIN) Short Wavelength Infrared Radiometer (remote sensing) Short Wave Listener (amateur radio) Short Wave Listening (amateur radio) Short Wave Listeners (amateur radio) Software Module Standing-Wave Ratio (transmission lines parameter) Structured Wiring System Standing-Wave Voltage Ratio (transmission lines) Super-extended Graphics Adapter (1600!1200 pixel monitors) Super-extended Graphics Adapter Plus (1800!1440 monitors) 1. Step-by-Step Switching (telephony) 2. Synchronous Cross-connect System Symbolic Link ﬁle (spreadsheet data) symbolic link Synchronous idle (character control code) 1. Synchronization 2. Synchronous Control Character synchronous synthesizer Name extension for system conﬁguration ﬁles (computer) systems operator (BBS) System Request system tray (Windows taskbar) Synchronization signal Unit

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Tt t T

T Carrier T Connector TPAD T&A T&C T&E T&EC T&L T&M T&T T-Berd T-BGA T-Bird T-Carrier T-CCS T-channel T-Load

time (mathematics) 1. Symbol for preﬁx tera-, denoting 240 or 1012 2. Symbol for Tesla (unit of magnetic induction) 3. Symbol for Trunk level 4. Symbol for Transformer (circuit diagrams) Trunk Carrier T-shaped Connector Terminal Packet Assembler/Disassembler Test and Accept Telemetry and Command (satcom) Technology and Evaluation Lab Tests and Evaluation Center (Intelsat) Teaching and Learning (e-learning) Test and Measurement Thrane and Thrane (company) Another name for T-1 Carrier Tape Ball Grid Array (microchips) Another name for T-1 Carrier Trunk Carrier (T-1 and T-2) Transparent Common Channel Signaling TDMA channel Technology Load

T

325

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&

T-1 T-1 CAS T-1C T-2 T-3 T-4 T/H T/R T/V T 2L T3POS TA

TAAPM TAB TABS TAC TACACS tacan TACC TACOS TACS TACSAT TACSIM TACT TAD TADIL TADIXS TADM

Comprehensive Glossary of Telecom Abbreviations and Acronyms

The North American Trunk Carrier level-1 transmission line operating at 1.544 Mbps T-1 Channel-Associated Signaling Trunk level-1 Combined The North American standard for Digital Signal level-2 transmission line operating at 6.312 Mbps The North American standard for Digital Signal level-3 transmission line operating at 44.736 Mbps The North American standard for Digital Signal level-4 transmission line operating at 274.176 Mbps Track and Hold Transmit and Receive Thermal Vacuum Transistor–Transistor Logic (digital electronics) Transaction Processing Protocol for Point Of Sale 1. Terminal Adapter (ISDN) 2. Terminal Acquisition 3. Timing Advance (GSM) 4. Technical Assembly (ETSI) 5. Technical Advisory (Telcordia Technologies) 6. Telecommunication Administration 7. Transistor Ampliﬁer Two-Axis Antenna Positioning Mechanism (Intelsat) 1. Tone Above Band 2. Tape-Automated Bonding 3. Technical Application Bulletin Telemetry Asynchronous Block Serial protocol (AT&T) 1. Test Access Controller 2. Terminal Access Controller 3. Type Approval Code (GSM mobile station) Terminal Access Controller Access Control System (IETF) tactical air navigation (military) Tracking And Control Center Transmission Accurate-purchase Control System Total Access Communications System (cell phone standard) Tactical Satellite (U.S.A.) Tactical Simulation (military) Trend Analysis for Circuit Troubles Telephone Answering Device Tactical Data Information Link (military) Tactical Data Information Exchange System (military) Trafﬁc Analysis Data Management

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Tt

TADS TADSS TAE TAF TAFAS TAG TAI TAL TALI TAM

TANC TANDM TANE TAO TAP

TAPAC TAPI TAPS .tar TAR TARD TARE TARGA TARM TARP TARS TAS

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1. Teletypewriter Automatic Dispatch System 2. Test And Display System Tactical Automatic Digital Switching System (messaging) Trans-Asia Europe (Cable Consortium) 1. Targeted Accessibility Fund 2. Terminal Adaptation Function (GSM) Trunk Answer From Any Station Technical Advisory Group (GSM) International Atomic Time Telephone Acoustic Loss Tekelec Adaptation Layer Interface (Tekelec) 1. Telephone Answering Machine 2. Telephone Account Management 3. Telephony Access Module 4. Telecommunication Access Method 5. Total Assignment Message (Intelsat) 1. Thrust Actuated Nutation Damping Control (Intelsat) 2. Thruster Active Nutation Control (Intelsat) Trafﬁc Analysis Data Management Telephone Association of New England 1. Telephony Application Object 2. Track At Once (CD data storage) 1. Transit Access Point 2. Test Access Part 3. Transferred Account Procedure (GSM) 4. Telocator Alphanumeric Protocol (messaging) 5. Terrain Analysis Package (software) 6. Two-step Approval Process (ETSI) Terminal Attachment Program Advisory Committee Telephony Application Program Interface TETRA Advanced Packet Service Name extension for the TAR program ﬁles (computer) 1. Total Accounting Rate 2. Tape Archive Towed Active Radar Device Telegraph Automatic Relay Equipment Truevision Advanced Raster Graphics Adapter Telephone Answering and Recording Machine Target ID Address Resolution Protocol (SONET) Turn Around Ranging Station 1. Telecommunication Authority of Singapore 2. Telephone Answering Service 3. Terminal Acquisition Support

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T

328

&

TASC TASI TASO TAT TAV TAXI Tb TB TB/s TB1 TBn TBA TBB TBBIBC TBC TBD TBE TBM TBOP TBOS TBR TBS TC

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Telecommunications Alarm, Surveillance, and Control system Time Assignment Speech Interpolation (telephone technique) Television Advisory Standards Organization Trans-Atlantic Telephone (cable) Transverse Acoustic-wave Voltage Transparent Asynchronous Transmitter and Receiver Interface Terabit (240 or 1024 times gigabit) 1. Terabyte 2. Trafﬁc Burst 3. Transparent Bridging (ATM) Terabyte per second Trafﬁc Burst 1 Trafﬁc Burst n 1. Transmit Burst Acquisition 2. To Be Announced later on 1. Transnational Broadband Backbone 2. Telecommunications Bonding Backbone TBB Interconnecting Bonding Conductor To Be Conﬁrmed later on 1. To Be Deﬁned later on 2. To Be Decided later on Transient Buffer Exposure (number of cells) Transport Bandwidth Manager (Northern Telecom) Transparent Bit-Oriented Protocol Telemetry Byte-Oriented Serial (protocol) 1. Technical Basis for Regulation (ETSI) 2. Timed Break Transmit Burst Synchronization 1. Transmission Control code 2. Transmission Convergence (ATM) 3. Tandem Connection 4. transcoder 5. Terrestrial Channel 6. Toll Center 7. Temperature Coefﬁcient (electronics) 8. telecommand 9. Time Committed (frame relay) 10. Timing Clock 11. Telecommunications Closet 12. Technical Committee (ETSI) 13. Transmission Coefﬁcient (parameter)

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Tt

TC SMG TC&F TC&R TCA TCAM TCAP TCAS TCB TCC

TCCF TCCGB TCCM TCE TCF TCG TCH TCI TCIC TCIF TCL TCLw TCL/TK TCLE TCM

TCM-4D TCN TCNS

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329

Technical Committee, Special Mobile Group (ETSI) Telecom Certiﬁcation & Filing, Inc. Telemetry, Command, and Ranging 1. Telecommunications Association (U.S.A.) 2. Target Channel Adapter (ﬁber optics) 3. Threshold Crossing Alert Telecommunications Access Method (IBM) Transaction Capabilities Application Part (SS7) 1. T-Carrier Administration System 2. Trafﬁc Alert and Collision and Avoidance System Trusted Computer Base 1. Trunk Control Circuit 2. Temperature Coefﬁcient of Capacitance (electronics) 3. Telephone Country Code Tactical Communications Control Facility Telephone Card Club of Great Britain Total Country Connectivity Measure 1. Thomson Consumer Electronics (company) 2. Technical Computing Environment 3. Thermal Coefﬁcient of Expansion 1. Training Check Frame 2. Technical Control Facility Teleport Communications Group (SONET) Trafﬁc Channel (GSM) 1. Telecommunications, Inc. (company) 2. Telecommunications Company of Iran (operator) 1. Telecommunication & Computer Industries Consortium (Iran) 2. Trunk Circuit Identiﬁcation Code (SS7) Telecommunications Industry Forum (standards organization) 1. Tool Command Language (programming) 2. Terminal Coupling Loss Weighted Terminal Coupling Loss Tool Command Language Toolkit Temperature Coefﬁcient of Linear Expansion 1. Trellis-Coded Modulation 2. Time-Compression Multiplexing (transmission) 3. Traveling Class Mark 4. Telecommunications Manager Trellis-Coded Modulation 4-Dimensional Table of Collective Numbers Thomas Conrad Networking System

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330

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

TCO TCP TCP/IP TCPA TCR

TCS TCSF TCTS TCU

TCUA TCV TCVXO TCW TCXO TD TD-CDMA TD-SCDMA TDAC TDAS TDC TDCS TDD TDDRA TDDS

1. Tandem Connection Overhead (SONET) 2. Total Cost of Ownership (Network Computer) 1. Transmission Control Protocol (ARPAnet) 2. Termination Connection Point 3. Tape Carrier Package (microchips) Transmission Control Protocol/Internet Protocol (DARPA) Telephone Consumer Protection Act 1. Transaction Conﬁrmation Report 2. Telemetry, Command, and Ranging (Intelsat) 3. Temperature Coefﬁcient of Resistance (electronics) 4. Tagged Cell Rate (ATM) 1. Transmission Convergence Sublayer (ATM) 2. Tactical Communications System 3. Trafﬁc Control System Telecommunications and Customer Service Forum (Canada) Trans-Canada Telephone System 1. Timing Control Unit 2. Teletypewriter Control Unit 3. Telematics Control Unit 4. Table of Closed User group Terminal Control Unit for A-interface Table of Address Conversion Temperature-Compensated Voltage-controlled Crystal Oscillator Taping Command Word Temperature-Compensated Crystal Oscillator (electronics) 1. Time Division 2. Time Delay 3. Tunnel Diode (electronics) Time Division CDMA (access) Time Division Synchronous CDMA (access) Time Domain Alias Cancellation Trafﬁc Data Administration System 1. Time Division Controller 2. Table of Dial Codes Theater Deployable Communications System 1. Telecommunications Device for the Deaf 2. Time Division Demultiplexed (cellular networks) 3. Time Division Duplexing (transmission) Telephone Disclosure and Dispute Resolution Act Time Division Duplex System

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Tt

TDE TDEL TDEV TDF TDHS TDI TDM TDM0 TDM1 TDMA TDMA/RA TDMA/SS TDMA-3 TDMA-6 TDMQPSK TDMS TDOA TDP TDQM TDR TDRS TDRSS TDS

TDSAI TDT TDU TDWR

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331

Time Delay Equalizer Technical Development and Evaluation Laboratory Time Deviation 1. Trunk Distributing Frame 2. Transborder Data Flow 3. Telediffusion de France Time Domain Harmonic Scaling 1. Trade Data Interchange 2. Transmit Digital Intertie 1. Time Division Multiplexing (transmission) 2. Trunk Data Module Primary NCS TDM carrier (transmission) Secondary NCD TDM carrier (transmission) Time Division Multiple Access TDMA with Random Assignment (access) TDMA with Satellite Switching (access) A TDMA system supporting 3 calls in a single carrier (access) A TDMA system supporting 6 calls in a single carrier (access) Time Division Multiplex Quadrature PSK (modulation) 1. Time Division Multiplex System 2. Technical Document Management System 3. Transmission Distortion Measuring Set Time Difference Of Arrival (radio direction ﬁnding) 1. Telocator Data Protocol 2. Tag Distribution Protocol 3. Transmit Digital Processing (circuit) Total Data Quality Management 1. Time-Domain Reﬂectometer (test equipment) 2. Temperature-Dependent Resistor (electronics) Tracking and Data Relay Satellite (remote sensing) Tracking and Data Relay Satellite System (NASA) 1. Test-case Deﬁnition System 2. Time Division Switching 3. Terrestrial Data Service 4. Terrestrial Digital Service 5. Transmission Data Service Transit Delay Selection And Indication 1. Total Delay Time 2. Time and Data Table (broadcasting) 1. Tape Drive Unit 2. Topology Database Update Terminal Doppler Weather Radar

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T

332

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

TE

TE1 TE2 TEA TEA laser TEC

TECF TED

TEDIS TEF TEFG TEGFET TEHO TEI TEK TEL TELCOs TELEC telecast Telecom Telecoms TELESA TELESAT teleran Telex TELNet TELRIC TELSET TEM

1. Terminal Equipment (ISDN) 2. Terminal Endpoint 3. Transit Exchange 4. Trunk Exchange 5. Telecom Egypt (operator) 6. Transverse Electric waveform (waveguides) Terminal Equipment type 1 (ISDN) Terminal Equipment type 2 (ISDN) Transferred Electron Ampliﬁer (electronics) Transversely-Excited Atmospheric-pressure laser 1. Total ionospheric Electron Content 2. Thermo-Electric Cooler 3. Thermal Electric Cooler 4. Telecommunications and Electronic Consortium Trafﬁc Editor Control File 1. Threshold Extension Demodulator 2. Transferred Electron Device 3. Transmission Electron-Diffraction contrast microscopy 4. Trafﬁc Engineering Database (ﬁber optics) 5. Trunk Encryption Device Trade Electronic Data Interchange System (ICT) Telecommunications Entrance Facility Terminal Endpoint Functional Group Two-dimensional Electron Gas FET (semiconductors) Tail End Hop-Off (trafﬁc engineering) Terminal Endpoint Identiﬁer (ISDN) Trafﬁc Encryption Key telephone Telephone Companies Telecom Engineering Center (company) television broadcast (transmission) telecommunications telecommunications Telecom Services Association ( Japan) Canadian Domestic Satellite Telecommunications System television radar air navigation Teletypewriter exchange (service) Teletypewriter Network protocol (DARPA) Total Element Long-Run Incremental Cost Telephone Set 1. Transverse Electromagnetic waveform (waveguides) 2. Transmission Electron Microscope

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Tt

TEMCO tempco TEN TENet TEO TERENA TERM TERRA TES TESC TESP TET TETRA TeV TEW Texel TF TFD TFEL TFF TFJ TFL TFLOPS TFM TFOM TFOS TFOW TFT TFTP TFTS TFU TG

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333

Telecommunications Equipment Manufacturing Company (Iran) temperature coefﬁcient 1. Transformer Exciting Network 2. Trans-European Telecommunications Network Texas Educational Network (e-learning) 1. Transferred Electron Oscillator 2. Telephone Equipment Order Trans-European Research and Education Networking Association (e-learning) 1. Telegraph Error Rate Measuring (equipment) 2. Terminal Mode Tandem Accelerator for Environmental and Radar and Radiolocation Analysis (remote sensing) Test Execution System Technology Sub-Committee Telecommunications Electric Service Priority Telegraph End Terminal (equipment) 1. Terrestrial Trunked Radio (new name) 2. Trans-European Trunked Radio system (old name) Teraelectronvolt (1012 eV) Trapped Electromagnetic Wave Texture element (textured 3D objects) 1. Time signals and Frequency standards emission 2. Transfer Function (mathematics) Thin-Film Detector (semiconductors) Thin-Film Electro-luminescent (semiconductors) Thin-Film Filter Te´le´vision Franc¸aise Juvie (broadcaster) Thin-Film Laser Tera (one trillion) Floating-point Operations (computer speed) Tamed Frequency Modulation 1. Thin-Film Optical Modulator 2. Thin-Film Optical Multiplexer Thin-Film Optical Switch Thin-Film Optical Waveguide Thin-Film Transistor (semiconductors) Trivial File Transfer Protocol Terrestrial Flight Telephone System Time and Frequency Unit 1. Task Group (IEEE) 2. Trunk Group (switching) 3. Terminator Group

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T

334

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

.tga TGA TGB TGC TGE TGF TGM TGS TGW TH THAAD THB THD THDCN THEOS thermistor THF THI thicknet thinnet THL THz TI TIA TIB TIBS TIC

TIC Trunk TICL TID TIE

Name extension for Targa format ﬁles (graphics) Short form for Targa (raster graphics ﬁle format) 1. Trunk Group Busy (switching) 2. Telecommunications Grounding Busbar Transmission Group Control (IBM SNA) Terminator Group—type E 1. Terminator Group—type F 2. Through Group Filter Trunk Group Multiplexer Test-case Generation System Trunk Group Warning Transmission Header (SNA) Theater High-Altitude Area Defense Temperature Humidity Bias Total Harmonic Distortion (parameter) Total Harmonic Distortion plus Noise Thai Earth Observation System (Thailand) thermal resistor (electronics) Tremendously High Frequency (300–3000 GHz range) Telephone Handset Integrator thick Ethernet coaxial cable thin Ethernet coaxial cable Trans-Hybrid Loss Terahertz (1012 Hz) 1. Terrestrial Interface 2. Transaction Identiﬁer (GSM) 1. Telecommunications Industry Association (U.S.A.) 2. Time-Interval Analyzer 3. International Atomic Time Tone-In-Band (modulation) Tactical Information Broadcast Service 1. Terminal International Center 2. Token-Ring Interface Coupler (IBM) 3. Telecommunications Infrastructure Company (Iran) Tandem InterLATA Connecting Trunk Temperature-Induced Cable Loss 1. Terminal Identiﬁcation (ISDN) 2. Target Identiﬁer 1. Telephone Interconnect Equipment 2. Terrestrial Interface Equipment 3. Trusted Information Environment (encryption) 4. Time-Interval Error

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Tt

TIES .tif TIF TIFF TIFF-F TIGA TIIAP TIM

TIMA TIMS TiN TINA TINA-C TINS TIP TIPHON TIPI TIQ TIR TIRKS TIROS TIS TISOC TISSS TIU TJF TL

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335

1. Time Independent Escape Sequence (modems) 2. Telecom Information Equipment and Services Name extension for TIF image ﬁles (graphics) 1. Tagged Image File (image format) 2. Terminal Interface node Tagged Image File Format (graphics) Tagged Image File Format—Fax (graphics) Texas Instruments Graphics Architecture Telecommunications and Information Infrastructure Assistance Program 1. Terrestrial Interface Module 2. Teletyper Input Method 3. Telecom Italia Mobile 4. Trace Identiﬁer Mismatch 5. Te´lecom Italia Mobile (Italian GSM operator) The Interactive Media Alliance Transmission Impairment Measurement Set Titanium Nitride (semiconductors) Telecommunications Information Networking Architecture (TMN) Telecommunications Information Networking Architecture Consortium (TMN) Thermal Imaging Navigation Set 1. Transaction Internet Protocol 2. TETRA Interoperability Proﬁle 3. Terminal Interface Processor Telecommunications and IP Harmonization Over Networks (ETSI) Telephone Industry Price Index Telrate International Quotations Total Indicated Reading Trunks Integrated Records Keeping System (Telcordia Technologies) Television Infrared Observation Satellite (U.S.A.) Technical Information Sheet Telecom Industry Services Operating Center (Bell Atlantic) Tester Independent Software Support System (DoD program) Terrestrial Interface Unit Test Jack Frame (PBX) 1. Tie Line (power system) 2. Transmission Level 3. Transport Layer

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336

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TL1 TLB TLD TLDN TLEC TLF TLI TLM TLMA TLP TLS TLSU TLV TLX TM

TM/TC TMA TMC

TMD TME TMF TMGB TMGT TMI TMIB

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Transaction Language 1 1. Terminal Loop-Back 2. Test Loop-Back 3. Translation-Look-aside Buffer Top-Level Domain (Internet) Temporary Local Directory Number (wireless networks) Terminating Local Exchange Carrier Trunk Link Frame (crossbar exchanges) Transport Layer Interface 1. telemetry 2. Transmission Line Matrix 3. Triple-Layer Metal Telematic Agent (X.400) Transmission Level Point 1. Transparent LAN Service 2. Transport Layer Security (protocol) 3. Telemetry Land Station Token-Ring LAN Service Unit (ATM) Type-Length-Value (encoding rules) telex 1. Tracking Module 2. Trafﬁc Management (network events) 3. Trouble Management (ATM) 4. Transverse Magnetic waveform (waveguides) 5. Terminating Multiplexer (SONET) 6. Terminal Mobility 7. Thematic Mapper (remote sensing) 8. telemetry 9. Transverse Magnetic (wave) Telemetry and Telecommand 1. Telecommunication Managers Association 2. Tower Mounted Ampliﬁer 1. Timeslot Management Channel (cordless messaging) 2. Tracking Mode Coupler (antenna, earth station) 3. Trafﬁc Management Center 4. Transfer Mode Converter Tactical MAP Display Telocator Message Entry (protocol) Telemanagement Forum (U.S. standards organization) Telecommunications Main Grounding Busbar telemanagement TRMM Microwave Imager (remote sensing) Trafﬁc Message Interchange Bus

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Tt

TML TMN

TMP TMR TMRC TMRS TMS

TMSI TMSL TMU TMUX TN

TNA TNC TNDS TNID TNL TNLCD TNPP TNR TNS TNSP TNT TNX TO

TOA/NPI

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Telephony Markup Language (programming) 1. Telecommunications Management Network 2. Telecomunicac¸oes Moveis Nacionais (Portugal GSM operator) 3. Trafﬁc Management Network 1. Test Management Protocol (ATM) 2. Theoretical Mid-Point (private line circuit) Trunked Mobile Radio Technology Marketing and Research Council Trafﬁc Measurement and Recording System 1. Time Multiplexed Switch (AT&T) 2. Times Microwave Systems (company) 3. TOPS Message Switch 4. Trouble Management System 5. Teleport Monitoring System (Intelsat) 6. Transmission Measuring Set Temporary Mobile Subscriber Identity (GSM) Test and Measurement Systems Language Terminal Make-Up transmultiplexer 1. Telephone Number 2. Time slot Number (GSM) 3. Terminal Number (Nortel) 4. Transit Network 5. Twister Nematic (display technology) Telematics Network for Administrations Treaded Naval Connector Total Network Data System Terrestrial Network Identiﬁcation code Terminal Net Loss Twisted-Nematic Liquid-Crystal Display Telocator Network Paging Protocol Transmission Not Ready Transit Network Selection (ATM) Transmission Network Service Provider Transparent Networking Transport (service) 1. Tetra Node Exchange 2. Thanks (Morse code transmissions) 1. Telecommunication Operator 2. Transmit Only 3. Tandem Ofﬁce 4. Toll Ofﬁce 5. Time Out (protocols) Type Of Address/Numbering Plan Identiﬁer

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

TOC TOCC TOD TOF TOGAF TOH TU TOI TOK TOM TOMS TOP TOPS ToS TOS TOSR TOVS TOW TP

TP monitor TP-DDI TP-MIC TP-PMD TP0 TP4 TPA TPAD TPC

Technical Operating Center Technical and Operational Control Center (Intelsat) Time Of Day 1. Time Out Factor (ATM) 2. Top-Of-File The Open Group Architectural Framework Transport Overhead (SONET) Teraohm (electronics) Third-Order Intercept Test Okay 1. Thin-ﬁlm Optical Modulator 2. Thin-ﬁlm Optical Multiplexer 3. Telecom Operations Map Total Ozone Mapping Spectrometer 1. Technical and Ofﬁce Protocol (Ethernet) 2. Thin Outline Package 1. Trafﬁc Operator Position System (Northern Telecom) 2. Transfer Orbit and Payload-testing Support Type of Service (DARPA) 1. Transfer Orbit Stage (satcom) 2. Thin-ﬁlm Optical Switch Telecommunications Ofﬁce of Shovak Republic TIROS Operational Vertical Sounder (remote sensing) Thin-ﬁlm Optical Waveguide 1. Twisted Pair 2. Transport Protocol (ISO) 3. Tunneling Protocol (VPNs) 4. Transition Point 5. transponder (satcom) 6. Test Point 7. Toll Plant 8. Transaction Processing Transaction Processing monitor Twisted-Pair Distributed Data Interface Twisted-Pair Media Interface Connector Twisted-Pair Physical Media Dependent technology Transmission Protocol 0 (OSI model) 1. Transmission Protocol 4 (OSI model) 2. Transport Protocol class 4 (ISO) Telephone Pioneers of America Terminal Packet Assembler/Disassembler 1. Turbo Port Card 2. TOPS Position Controller

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Tt

TPC-D TPCC TPDDI TPDU TPEX TPF TPG TPI TPM

TPMR TPN TPOA TPON TPOS TPQFP TPR TPRC TPS TPU TPV TPWG TQ TQC TQFP TQM TR

TR tube TRA

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3. Transaction Processing Council 4. Transmit Power Control Transaction Processing Council Benchmark-D Third-Party Call Control (ATM) Twisted-Pair Distributed Data Interface Transport Protocol Data Unit (OSI model) Twisted-Pair Ethernet Transceiver Twists Per Foot (wires and cables) Test Pattern Generator (TV broadcast) 1. Tracks Per Inch (data recording parameter) 2. Telephone Plant Index 1. Trafﬁc Processor Module 2. Total Productive Maintenance 3. Teleprocessing Monitor 4. Terminating Point Masterﬁle 5. Transactions Per Minute (ICT) Trunked Professional Mobile Radio Totally Private Network Telecommunications Private Operating Agency Telephony over Passive Optical Network Training, Planning & Operational Support (NCS) Test-Pad Quad Flat Pack (microchips) transponder Telecommunications Policy Research Conference 1. Telephone Preference Service 2. Te´le´vision Par Satellite (France) Time Processor Unit Third-Party Veriﬁcation (FCC) Technology Policy Working Group Toll Quality Total Quality Control (of products) Thin Quad Flat Pack (microchips) Total Quality of Management (ICT) 1. Technical Requirement 2. Token Ring (LANs) 3. Trouble Report 4. Technical Reference (Telcordia Technologies) 5. transistor (circuit diagrams) 6. Transfer Request 7. Transmit–Receive 8. Transient Response Transmit–Receive tube 1. Telecommunications Regulatory Authority (Egypt) 2. Telecommunications Resellers Association (U.S.A.)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

TRAC tracert TRACON TRADACOMS TRAM transceiver TRANSEC transistor transponder transputer TRAP TRAPATT TRAU TRC TRCO TRD TRE TREE TREES TREX TREG TRF TRFR TRG TRI-CWDM triac TRIB TRIBES triode TRIP TRIS TrL TRL TRM

Technical Recommendations Application Committee trace route (routing) Terminal Radar Approach Control Trading Data Communications 1. Transputer RAM (memory) 2. Transimpedance Ampliﬁer transmitter and receiver Transmission Security transfer resistor transmitter responder (satcom) transistor computer 1. Tandem Recursive Algorithm Process 2. Tactical Receive Application Protocal (military) Trapped Plasma Avalanche Triggered Transitor (semiconductors) Transcoding and Rate Adaptation Unit (GSM voice coding) 1. Transit Routing Control Table 2. Transverse Redundancy Check (data streams) Trouble Reporting Central Ofﬁce Technical Requirement Document Telecommunications Research Establishment Transient Radiation Effects on Electronics Tropical Ecosystems Environment observation by Satellite Transmission Expert Telecommunications Regulatory E-mail Grapevine 1. Tracking & Receiving Facility 2. Tuned Radio Frequency (circuit) transfer Technical Review Group Tri-Color Wavelength-Division Multiplexing (ﬁber optic lines) triode AC (semiconductor switch) tributary Tri-Band Earth Station (CMI) A three-electrode electron tube 1. Telephone Routing over IP (protocol) 2. Token-Ring Interface Processor Tactical Reconnaissance Intelligence Service Transmission Line 1. Transistor–Resistor Logic (digital electronics) 2. Through-Reﬂect-Line (calibration) 1. Technical Reference Model

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Tt

TRMM TRMS TRN TRO TRS

TRT TRU TRX TRxxx TS

TS3 TSA

TSAC TSACC TSAG TSAP TSAPI TSAT TSB TSC

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341

2. transmitter 3. terminal 4. Terminal Mode 5. Terminal Multiplexer Tropical Rainfall Measuring Mission (remote sensing) Transmission Resource Management System Token-Ring Network Temporary Restraining Order 1. Telecommunication Relay Service 2. Telephone Relay Service 3. Trunked Radio System 4. Tip, Ring, Sleeve (cables) Timing Reference Transponder Tone Receiver Unit (telephone set) 1. transceiver (Transmitter and Receiver) 2. Transmission and Reception Unit Technical Reference number 1. Transport Stream (ATM) 2. Trafﬁc Shaping (ATM) 3. Technical Speciﬁcation 4. Time Stamp (ATM) 5. Time Slot (switching) 6. Time Sharing 7. Transaction Server 8. Transmission Scheme 9. Toll Switch Time Stamp version 3 (ATM) 1. Time Slot Allocation 2. Time Slot Assignment 3. Tapered-Slot Antenna 4. Telecommunications System Architecture Time-Slot Assigner Circuit Telecommunications Standards Advisory Council of Canada Telecommunications Standardization Advisory Group Transport Service Access Point (OSI model) Telephony Services Application Programming Interface (AT&T) T-1 Small Aperture Terminal (satcom) 1. Telecommunications Standardization Bureau (ITU-T) 2. Telecommunications System Bulletin 1. Transit Switching Center 2. Training Sequence Code (GSM)

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&

TSCM TSDU TServer TSF TSG TSI TSIC TSIU TSK TSM

TSO

TSOP TSP

TSPS TSR

TSRM TSS

TSSI TSSOP

Comprehensive Glossary of Telecom Abbreviations and Acronyms

3. Transport Stream Combiner (TV broadcast) 4. TDM-Switched Capable (GMPLS) 5. Two-Six Code 6. Transmission System Construction 7. Technical Service Centers Technical Surveillance Countermeasures Transport Service Data Unit (OSI model) Telephony Server 1. Through Supergroup Filter 2. Te´le´coms Sans Frontie´rs (France) 3. Trail Signal Failure (MUX) Time Signal Generator 1. Time Slot Interchange 2. Transmitting Subscriber Information 3. Telecommunication System Integration Time Slot Interchange Circuit (PCM) Time Slot Interchange Unit (switching) Transmission Security Key 1. TDMA System Monitor 2. Terminal Server Manager 3. Telecommunications System Management 4. Topology-Speciﬁc Module (networking) 1. Time Sharing Operation 2. Time Sharing Option (IBM) 3. Telecommunications System Operator 4. Technical Support Operations Thin Small-Outline Package (microchips) 1. Telecommunications Service Priority (FCC) 2. Technical Support Planning 3. Transport Stream Processor 4. Temperature-Sensitive Parameter 5. Telematics Service Provider Trafﬁc Service Position System 1. Terminate-and-Stay-Resident (programs) 2. Telephone Service Representative (agent) 3. Telecommunications Service Request 4. Tag Switching Router Telecommunication Standards Reference Manual 1. Telecommunication Support System 2. Telecommunication Standard Section (ITU) 3. Trafﬁc Scheduling System 4. Time Space Switch Time Slot Sequence Integrity 1. Thin-Scaled Small-Outline Package (microchips)

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Tt

TST TSTN TSTS TSU TSW TT

TT&C TT&P TTA TTAB TTC TTC&M TTCP TTD TTF TTI TTIA TTIB TTL TTMF TTP TTR TTRT TTS TTTN TTX TTY TTY OW TU

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343

2. Thin-Shrink Small-Outline Package (microchips) 1. Time–Space–Time system (switching) 2. test Triple Super-Twisted Nematic (display technology) Transaction Switching and Transport Service Tone Sender Unit (telephone set) Transmit Switch 1. Trafﬁc Terminal 2. True Type (Windows fonts) 3. Touch-Tone 4. Transaction Time 5. Tunisie Telecom (Tunisia) 6. Tu¨rk Telecom (operator) 1. Telemetry, Tracking, and Command (satellites) 2. Telemetry, Tracking, and Control Center (Intelsat) Technical Training and Publications Telecommunications Technology Association Transparent Tone Above Band 1. Transmit Timing Controller 2. Telecommunications Technology Committee (Japan) 3. Time-To-Collection (data acquisition) Telemetry, Tracking, Command, and Monitoring (satellites) Test TCP True Time Delay (phase shifters) Transport Termination Function 1. Transmit Terminal Identiﬁcation (fax machine) 2. Team Telecom International Telecommunications Technology Investment Act Transparent Tone In Band 1. Transistor–Transistor Logic (digital electronics) 2. Time-To-Live (packet data transmission) Trunk Type Master File (MCI) 1. Trail Termination Point 2. Trusted Third Party (contracts) Touch-Tone Receiver Target Token Rotation Time (FDDI) 1. Text-To-Speech Synthesis 2. Transaction Tracking System (networking) Tandem Tie Trunk Network Teletypewriter Exchange (service) teletype (or teletypewriter) Teletypewriter Order-Wire 1. Trafﬁc Unit

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TUA TUANZ TUBA TUC TUG TUI TUP TUR TURN TUST TUV TV TV/PC TVC TVE TVI TVM TVOR TVRO TVS TVSS TWA TWAIN TWAT TWC TWS TWT TWTA TWX TX

Comprehensive Glossary of Telecom Abbreviations and Acronyms

2. Transmit Unit 3. Terminal Unit 4. Tributary Unit (MUX) 5. Traveling User (SDNS) Telecommunications Users Association (U.K.) Telecommunications Users Association of New Zealand TCP and UDP with Bigger Address (Internet) 1. Total User Cell (ATM) 2. Total User Calls 1. Telecommunication User Group 2. Tributary Unit Group (MUX) Telephone User Interface 1. Telephone User Part (SS7) 2. Transponder Uplink system (satcom) 1. Trafﬁc Usage Recorder 2. Trunk Utilization Report The Utilities Reform Network Tunneling and Underground Space Technology Technischer Uberwachungs-Verein (Germany) 1. television 2. Technical Vulnerability TV with PC smarts (Microsoft) Trunk Veriﬁcation by Customer Transversal Equalizer Television Interference Time-Varying Media (SCSA) Terminal VHF Omni-Range Television Receive-Only (broadcasting) 1. Trunk Veriﬁcation by Station 2. Transient Voltage Suppressor Transient Voltage Surge Suppressor 1. Traveling-Wave Ampliﬁer (electronics) 2. Two-Way Alternate (communication system) Toolkit Without An Interesting Name (scanners standard) Traveling-Wave Ampliﬁer Tube (electronics) Two-Wire Circuit 1. Two-Way Simultaneous (transmission) 2. Track-While-Scan Traveling-Wave Tube (microwave) Traveling-Wave Tube Ampliﬁer Teletypewriter Exchange (service) 1. transmit or transmission

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Tt

TXD Tx/Rx .txt

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345

2. transmitter 3. Transit Exchange (switching) 4. Terminal Exchange Transmit-Data (RS232 signal) Transmitter and Receiver Name extension for ASCII text ﬁles (computer)

T

AU5866—CHAPTER T—T—12/7/2007—11:26—VELU—274422—XML MODEL E – pp. 325–345

Uu U U Frame U Plane U-band U-C U-NII U-R U/C U/D U/L UA UAC UADSL UAE UAEnic UAF UAL UAMPT UAN UAPT

Symbol for radiation intensity (antennas) Unnumbered Frame User Plane (ATM) Optical Frequency band ranging from 1625 to 1675 nm User Central (ADSL) Unlicensed-National Information Infrastructure User Remote (ADSL) Up-Converter (satcom) Up/Down Chain (Intelsat) Up-Link 1. Unnumbered Acknowledge response (X.25) 2. User Agent (OSI Application) User Agent Client (OSI Application) Universal Asymmetrical DSL (access) 1. User Access Equipment 2. User Agent Entity (message systems) United Arab Emirates network information center Universal Active Filter (electronics) User Agent Layer (OSI model) Union of African and Malagasy Post and Telecommunications Universal Access Number (INs) Union of African Post and Telecommunications 347

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U

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&

UARS UART UARTO UAS UASs UAT UAV UAWG UAX UBR UBS UC

UCA UCAID UCB UCC UCD UCF UCITA UCM UCS UCT UDC UDDI UDF UDI UDK UDLC

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Upper Atmospheric Research Satellite Universal Asynchronous Receiver–Transmitter (computer chips) United Arab Republic Telecommunications Organization 1. User Agent Server (OSI Application) 2. Uniﬁed Antenna Structure Unavailable Seconds User Acceptance Testing 1. Unmanned Aerial Vehicle 2. Unpiloted Aerial Vehicle Universal ADSL Working Group Unit Automatic Exchange Unspeciﬁed Bit Rate (ATM) Uninterruptible Battery System 1. Uniﬁed Communications 2. Universal Controller 3. Unit Controller 4. Unit Call 5. User Channel Utility Communications Architecture University Corporation for Advanced Internet Development Unit Control Bus Uniform Commercial Code Uniform Call Distributor UNIX Computing Forum Uniform Computer Information Transaction Act 1. Universal Call Model (SS7 routing) 2. Universal Controller Module 1. Uplink Control System (software) 2. Universal Character Set Universal Coordinated Time 1. Universal Digital Carrier 2. Universal Device Connector 3. Universal Data Classiﬁcation Universal Description Discovery and Integration (e-commerce) Universal Disk Format (GIS imaging) Unrestricted Digital Information (ISDN) Universal Dialing Keyset (GTE) 1. Universal Digital Loop Carrier 2. Universal Data-Link Control (protocol)

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Uu

UDLR UDLT UDMA UDOP UDP UDP/IP UDPU UDSL UDT UDTS UDTV UDWDM UECT UEM UEPS UER UET UFB UFMOP UFO UFOs UFSS UG UGWG UHF UHTP UHV UI UICC UID UIFN UIL UIM UIR UIS UIT UJT UKERNA

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349

Uni-Directional Link Routing Universal Digital Loop Transceiver Ultra-DMA Ultimate Dumb, Open Programmable (switches) 1. User Datagram Protocol (Internet) 2. Unacknowledged Datagram Protocol (Internet) User Datagram Protocol /Internet Protocol Universal Data Patch Unit Unidirectional High bit-rate DSL (access) Uniform Data Transfer (OLE technology) Universal Data Transfer Service (Intelsat) Ultra-Deﬁnition Television (broadcasting) Ultra-Dense Wavelength-Division Multiplexing Universal Encoding Conversion Technology Universal Equipment Module (Northern Telecom) Unit Eruptible Power Supply Undeleted Error Ratio Unattended Earth Terminal Unﬁt For Broadcast (Intelsat) Unintentional Frequency Modulation On Pulse UHF Follow-On Unidentiﬁed Flying Objects Upstream Failed Signal State Under-Ground User Glossary Working Group (Internet) Ultra-High Frequency (300 MHz to 3 GHz range) Unidirectional Hypertext Transfer Protocol 1. Ultra-High Voltage (power) 2. Ultra-High Vacuum 1. User Interface (GSM) 2. Unnumbered Information 3. Unix International (consortium) Universal Integrated Circuit Card User ID Universal International Freephone Number User Interface Language Universal Identity Module 1. Upper ﬂight Information Region (aviation) 2. Uniform Impedance Resonator Universal Information Services (AT&T) Union Internationale Des Telecommunications Uni-Junction Transistor (semiconductors) United Kingdom Education and Research Networking Association (e-learning)

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U

350

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

UKISC UKNet UKOLN UL ULANA ULF ULH ULL ULP ULS ULSI UM UMA UMB UME UMIB UMIG UML UMS UMSP UMTS UMTSF UN UNA UNC UNCOPUOS UNE UNE-P UNI UNI-RZ UNIBOL UNII UNIVAC UNIX

United Kingdom Industrial Space Committee (U.K.) University of Kentucky’s campus Network U.K Ofﬁce for Library and Information Networking (ICT) Underwriters Laboratories, Inc. (U.S. standards organization) Uniﬁed Local Area Network Architecture (U.S. Air Force) Ultra-Low-Frequency (300–3000 Hz range) Ultra-Long-Haul (ﬁber optics) Ultra-Low-Loss (optical ﬁbers)) Upper Layer Protocol (OSI model) User Location Service Ultra-Large-Scale Integration (microchips) 1. Uniﬁed Messaging 2. Unit Manager 3. Unintentional Modulation 1. Upper Memory Area (computer) 2. Unlicensed Mobile Access Upper Memory Block (computer) UNI Management Entity (ATM) Utility Message Interchange Bus Universal Messaging Interoperability Group Uniﬁed Modeling Language (programming) 1. Universal Messaging Service 2. Uniﬁed Messaging Service Uniﬁed Memory Space Protocol Universal Mobile Telecommunications System (Europe) UMTS Forum (wireless) United Nations Uniﬁed Network Architecture Universal Naming Convention (ﬁle naming) United Nations Committee On Peaceful Uses of Outer Space Unbundled Network Elements Unbundled Network Elements—Platform User-to-Network Interface (frame relay) Unipolar—Return-to-Zero (data encoding) Unix version of COBOL (programming) Unlicensed National Information Infrastructure (wireless) Universal Automatic Computer Universal Network Information Exchange (operating system)

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Uu

UNMA UNMR UNO UNTDI UOI UPC UPCS UPI UPM UPN UPnP UPP UPS UPSR UPT UPTAA UPTAC UPTAN UR URA URC URE URFS URI URL URM URN URSEC US USAC USACII USAN USART USAT

&

351

Universal Network Management Architecture Universal Network Management Record Universal Networked Objects United Nations Trade Data Interchange Utilities Operating Instructions 1. Uplink Power Control 2. Usage Parameter Control (ATM) 3. Universal Product Code (bar code naming) Unlicensed Personal Communications Services (FCC) User Protocol Interface 1. Utility Processor Module 2. Ultra-Portable Multiplexer Universal Personal Number (GSM) Universal Plug and Play (computer standard) Universal Payment Preamble 1. Uninterruptible Power Supply (power) 2. Ultraviolet Photoelectron Spectroscopy Unidirectional Path-Protection Switched Ring (MUX) Universal Personal Telecommunications UPT Access Address UPT Access Code UPT Access Number 1. ultrared 2. your (Morse code transmissions) Uniform Resource Agent (Internet) 1. Uniform Resource Characteristic (Internet) 2. Uniform Resource Citation (Internet) User Range Error Up-link RF System (TV satellite broadcast) Uniform Resource Identiﬁer (Internet) Universal Resource Locator (Web page address) User Request Manager Uniform Resource Name (Internet) Unidad Reguladora de Servicios de Comunicaciones (Uroguay) Unit Separator (character control code) Universal Service Administrative Company U.S.A Standard Code of Information Interchange Unites States Advanced Network Universal Synchronous/Asynchronous Receiver/ Transmitter Ultra-Small Aperture Terminal (satcom)

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U

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&

USB USCM USD USDC USDLA USDN USEDA USENET UserID USF USGS USHR USIIA USIM USITA USKA USNO USO USOA USOC USOP USOS USP USPID USPTO USRT USS USSA USSB USSC USSD USSI USTA USTSA USTTI

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Universal Serial Bus (computer) 2. Uniﬁed S-Band 3. Upper Side-Band (modulation) Universal Service Component Model Universal Synchronous Data United States Digital Cellular United States Distance Learning Association (standards) United States ISDN Users Society for Electronic Design Automation User’s Network (networking) User Identiﬁcation 1. Universal Single Frequency 2. Universal Service telephone Fee (U.S.A.) United States Geological Survey Unidirectional Self-Healing Ring United States Internet Industry Association UMTS Subscriber Identity Module (cellular networks) United States Independent Telephone Association 1. Union Schweizerischer Kurzwellen-Amateure 2. Union of Swiss Shortwave Amateurs (Switzerland) United States Naval Observatory Universal Service Obligations Uniform System Of Accounts (FCC) Universal Service Order Code (AT&T) User Service Order Proﬁle United States On-orbit Segment 1. Universal Service Plan 2. Usage Sensitive Pricing (tariff) User Service Proﬁle Identiﬁer United States Potent and Trademark Ofﬁce Universal Synchronous Receiver-Transmitter (computer chip) 1. Unstructured Supplementary Services (GSM) 2. Unilateral Synchronization System United States Suppliers Association United States Satellite Broadcasting (company) Upper Sideband Suppressed Carrier (modulation) Unstructured Supplementary Subscriber Data (GSM) Universal Synchronous Serial Interface United States Telephone Association (U.S.A.) United States Telephone Suppliers Association (U.S.A.) United States Telecommunications Training Institute (standards)

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Uu

UT UTA UTAM UTC UTDR UTF-8 UTOPIA UTP UTQFP UTR UTRA UTRAN UTS UTSOP UUCP .uud UUD UUDECODE .uue UUE UUENCODE UUI

UUID UUT UV UV-PROM UVA UVB UVLO UW UWB UWC UWCC UXGA

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353

1. Universal Time 2. User Terminal 3. Upper Tester (ATM) Utilities Telecommunications Association (U.S. standards) Unlicensed Transition And Management (microwave) 1. Universal Time Coordinated 2. United Telecom Council Universal Trunk Data Record UCS Transformation Format-8 Universal Test and Operations Interface for ATM Unshielded Twisted-Pair (cables) Ultra-Thin Quad Flat Pack (microchips) Universal Tone Receiver UMTS Terrestrial Radio Access UMTS Terrestrial Radio Access Network Universal Telephone Service Ultra-Thin Small-Outline Package (microchips) Unix-to-Unix Copy Protocol Name extension for the binary ﬁles translated to ASCII format using UUDecode (computer) UNIX-to-UNIX Decoding (computer) Unix-to-Unix Decoding (computer) Name extension for the binary ﬁles translated to ASCII format using UUEncode (computer) UNIX-to-UNIX Encoding (computer) Unix-to-Unix Encoding 1. Uniﬁed User Interface 2. Unique User Identiﬁer 3. User-to-User Indicator (ATM) 4. User-to-User Information (ISDN) Universally Unique Identiﬁer Unit Under Test 1. Ultra-Violet 2. Uniﬁed Voice Ultra-Violet erasable PROM (memory) Ultra-Violet Alpha Ultra-Violet Beta Under Voltage Lock-Out (thresholds) Unique Word Ultra-Wide-Band Universal Wireless Communications Universal Wireless Communications Consortium Ultra-Extended Graphics Array (monitors standard)

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U

Vv v V

V.Chip V.ASVD V.AVD V.DSVD V.fast V.FC V.PCM V&H VCD V-band V-Commerce V-MOS V-pol V-root V/D V/F

Symbol for velocity 1. Symbol for Volt (unit of voltage or potential difference) 2. Symbol for Vertical polarization (satcom) 3. Symbol for Voltmeter or an electron Vacuum tube 4. Vocabulary and related subjects (ITU-T) Violence Chip (TV ﬁlter) Version Analog Simultaneous Voice and Data (modems) Version Alternating Voice and Data (modems) Version Digital Simultaneous Voice and Data (modems) Version Fast-speed (modems) Version Fast Class (modems) Version Pulse-Code Modulation (modem) Vertical & Horizontal Voice Plus Data Radio frequency band ranging from 40 to 75 GHz (radar) Voice Commerce V-groove MOS (semiconductors) Vertical polarization Virtual root Voice and Data Voltage-to-Frequency converter (electronics) 355

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V

356

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

V/m V/T VA VAB

Vac VAC VACC VAD

VADIS VADS VADSL VAFC VAIVR VAM VAN VANA VANS VAP VAPD VAPN VAR

varactor varicap varistor VARTI VAS VASP VASCAR

Volts per meter (electric ﬁeld gradient) Virtual Time (Internet) Volt–Ampere (electronics) 1. Value-Added Business partner (Hewlett-Packard) 2. Voice Answer Back 3. Vehicle Assembly Building (Kennedy Space Center, Florida) Volts Alternating Current (electronics) 1. Voice Activity Compression 2. Vehicle Access Control 3. Value-Added Carrier Value-Added Common Carrier 1. Voice Activated Dialing 2. Voice Activity Detector (GSM) 3. Value-Added Dealer 4. Vapor-phase Axial Deposition process (optical ﬁbers) Voice And Data Integrated System Value-Added Data Service Very-high-speed Asymmetrical DSL (access) VESA Advanced Feature Connection Voice Activated Interactive Voice Response 1. Value-Added Module (ﬁber optics) 2. Versatile Access Multiplexer Value-Added Network (Intelsat) Vector Automatic Network Analyzer Value-Added Network Service (data transmission) 1. Value-Added Process (networking) 2. Vector Adaptive Predictive (coding) 3. Virtual Assembly Program Voice Activated Premier Dialing Voice Access to Private Network 1. Value-Added Reseller (ICT) 2. Visual-Aural Range 3. Volt-Ampere-Reactive (power generators) 4. variable variable reactance diode (semiconductors) variable capacitance diode (semiconductors) variable resistor (semiconductors) Value-Added Reseller Telephone Integrator (PC telephony) Value-Added Service Value Added Service Provider Visual Average Speed Computer And Recorder

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Vv

VAX VB VBA VBD VBE VBI VBNS VBR VBRE VBS VBScript VBW VBX VC

VCA VCACHE vCalendar VCAPS vCard VCC VCCS VCD VCD IC VCEP VCF VCFU VCI VCL VCM

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357

Virtual Address Extension (minicomputers) Visual Basic (software) Visual Basic for Applications (computer) Voice-Band Data VESA BIOS Extensions Vertical Blinking Interval (TV signal) Very-high-speed Backbone Network Service (optics) 1. Variable Bit Rate (ATM) 2. Breakdown Voltage (FETs) Variable Bit Rate Encoding Variable Bit-rate Service Visual Basic Scripting edition (software) Video Bandwidth Visual Basic Extension 1. Virtual Channel (SONET and ATM) 2. Virtual Container (MUX) 3. Virtual Circuit (X.25) 4. Virtual Connection (ATM) 5. Virtual Call (X.25) 6. Video Cipher 7. Video Conferencing 1. Voice Connecting Agreement 2. Voltage-Controlled Ampliﬁer (electronics) 3. Virtual Channel Adaptation (MUX) VFAT driver CACHE (Windows 95) virtual Calendar Vertical Cavity Amplifying Optical Switch Virtual Card 1. Virtual Channel Connection (ATM) 2. Supply Voltage—positive Voltage-Controlled Current Source (electronics) 1. Video Compact Disk 2. Variable Capacitance Diode (electronics) 3. Vector Correlation Detection Vector Correlation Detection Interference Canceller Video Compression/Expansion Processor (chip) Virtual Card File Video Crypt Feedback Unit (TV broadcast) Virtual Channel Identiﬁer (ATM) 1. Virtual Channel Link (ATM) 2. Visual Component Library (Borland Delphi products) 1. Voice Coding Module 2. Virtual Channel Memory

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V

358

&

VCN VCO VCOMM VCOS VCPI VCPU VCR VCS VCSEL VCSELD VCSN VCT VCVA VCVS VCXC VCXO VD VDAP VDB VDC VDD VDD VDDD VDE VDF VDI VDIF VDISK VDL VDM VDO VDPC VDRV VDS VDSL VDT VDU VEN

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Virtual Corporate Network 2. Virtual Circuit Number (X.25) Voltage-Controlled Oscillator (electronics) Virtual Communications (device driver) Visible Caching Operating System Virtual Control Program Interface (MS-DOS programs) Video Compression Processor Unit Video-Cassette Recorder Virtual Communications System Vertical-Cavity Surface-Emitting Laser Vertical-Cavity Surface-Emitting Laser Diode Virtual Channel Sub-Network Virtual Channel Termination (MUX) Voltage-Controlled Variable Attenuator Voltage-Controlled Voltage Source (electronics) Virtual Circuit Cross-Connect (MUX) Voltage-Controlled Crystal Oscillator (electronics) Virtual Destination Voice and Data Access Point Visitor Database Volts, Direct Current (electronics) Virtual Device Driver Voltage Drain-Drain (electronics) VNET International Direct Distance Dialing (feature) 1. Visual Development Environment 2. Video Decompression Engine Voice Distribution Frame 1. Video Device Interface 2. Virtual Device Interface VESA Display Information Forum Virtual DISK Vienna Deﬁnition Language (programming) 1. Voice Data Multiplexer 2. Video Display Metaﬁle Voltage Drop-Out Voice Data Port Card Variable Data Rate Video Variable-Depth Sonar Very-high-data-rate DSL (access) 1. Video Display Terminal (CRT) 2. Video Dial Tone (service) 1. Video Display Unit (computer monitor) 2. Visual Display Unit Virtual Ethernet Network

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Vv

VERONICA VERT VES VESA VESDA VF VFAT VFC VFCTG VFD VFDF VFDN VFET VFG VFIP VFO VFRAD VFS VFTG VG VGA

VGC VGE VGF VGPL VGrep VHADSL VHD VHDCI VHDL

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Very Easy Rodent Oriented Netwide Index to Computerized Archives (Internet) Vertical (polarization) Virtual Environment Software Video Electronics Standards Association Very Early Smoke Detection Alarm 1. Voice Frequency (signal or channel) 2. Variance Factor (ATM) 3. Vacuum Fluorescent (display) Virtual File Allocation Table (computer) 1. Version Fast Class (modems) 2. Voltage-to-Frequency Converter (electronics) Voice Frequency Carrier Telegraph Vacuum Fluorescent Display Voice Frequency Distribution Frame Voice Frequency Directory Number (Northern Telecom) Vertical FET (semiconductors) Virtual Facilities Group Voice File Interchange Protocol Variable-Frequency Oscillator (electronics) Voice Frame Relay Access Device 1. Virtual File Store 2. Virtual File System Voice Frequency Telegraph 1. Videotex Gateway 2. Voice Grade (local loop) 1. Video Graphics Adapter (640!480 pixel monitors) 2. Video Graphics Array (monitors standard) 3. Video Graphic Accelerator (circuit) 4. Variable Gain Ampliﬁer (electronics) 1. Voice Grade Channel 2. Voice Grade Circuit 1. Voluntary Group of Experts (ITU) 2. Voice Grade Equivalent Voice Grade Facility Voice Grade Private Line Visual Grep (UNIX utility) Very High-bit-rate Asymmetric DSL (access) Very High Density (data storage) Very High Density Cable Interconnect (PC cable) 1. Very High-speed IC hardware Description Language 2. VHSIC Hardware Description Language (programming)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

VHDSL VHE VHF VHI VHLL VHS VHSD VHSIC VI VIA VIC VIDA VIDF VIEWS VIL VIM VINES VIP VIPA VIPR VIR VIRR VIRS VISA VisiCalc VISSR VISTA Visual JCC VITA Vital VITC VITS VIU VL Bus

3. Very High-Density Logic (digital electronics) Very High-bit-rate DSL (access) Virtual Home Environment (GSM) Very High Frequency (30–300 MHz range) Virtual Host Interface Very High-Level Language (programming) Video Home Systems (video format) Very High-Speed Data Very High-Speed Integrated Circuit Virtual Instrument 1. Vendors ISDN Association 2. Virtual Interface Architecture Voice Interface Card (Cisco) Voice, Interoperability, Data and Access Vertical Intermediate Distributing Frame Visualizing Impacts of Earthquakes With Satellite (Japan) Vertical Inline 1. Voice Interface Module 2. Vendor Independent Messaging Virtual Networking Software (networking) 1. Versatile Interface Processor (Cisco) 2. Virtual Internet Protocol (Cisco) 1. Virtual Image Phased Array 2. Virtual Internet Protocol Addressing 1. Virtual Internet Protocol Routing (Cisco) 2. Voice over IP Router Vertical Interval Reference (video) Visible and Infrared Radiometer (remote sensing) Visible and Infrared Scanner (remote sensing) 1. Virtual Instrument Software Architecture 2. VXI System Alliance (standard) Visible Calculator (historic software) Visible and Infrared Spin Scan Radiometer (remote sensing) VLSI Integrated Set Top Architecture (broadcasting) Java Visual programming environment (Microsoft) 1. Volunteers In Technical Assistance 2. VME International Trade Association VHDL Initiative Toward ASIC Libraries (organization) Vertical Interval Time Code (VCR) Vertical Interval Test Signal Voice Interface Unit VESA Local Bus (computer)

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Vv

VLAN VLB VLBI VLC VLD VLDB VLF VLIW VLM VLN VLR VLRE VLS VLSI VLSIC VLSM VLT VM

VMC VME VMEbus VMEC VMF VMI VMOS VMR VMS

VMTP VMUIF VMWI VMX

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Virtual LAN VESA Local Bus (computer) Very Long Baseline Interferometry (remote sensing) Variable Length Coding 1. Variable Length Decoding 2. Vehicle Location Detection system Very Large Database Very Low Frequency (10 Hz–30 KHz range) Very Long Instruction Word (microprocessor architecture) 1. Virtual Loadable Module (networking) 2. Very Large Memory Visitor Local Number (GSM) Visitors Location Register (cellular networks) Very Low Rate Encoding 1. Virtual Library System 2. Virtual LAN Link State protocol (Cabletron Systems) Very Large-Scale Integration (microchips) Very Large-Scale Integrated Circuit Variable-Length Subnet Mask Video Look-up Table 1. Voice Mail 2. Voice Messaging 3. Virtual Memory 4. Virtual Machine VESA Media Channel (bus) 1. Virtual Machine Environment (operating system) 2. Versa Module Eurocard Versatile Modular E-bus Voice Messaging Educational Committee (e-learning) Validation Message Fraud 1. V Series Modem Interface 2. Vehicle Management Information Vertical MOS (semiconductors) Validation Monitoring and Removal 1. Voice Mail Service 2. Voice Messaging Service (ﬁx and mobile) 3. Virtual Messaging Service (ﬁx telephony) 4. Virtual Memory System (operating system) 5. Vessel Monitoring System (shipping) Versatile Message Transaction Protection Voice Messaging User Interface Forum Visual Message Waiting Indicator Voice Message Exchange

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

VN VNA VNET VNIR VNL VNLF VNN VNS VO VOA VoATM VoBB VOC vocoder VoD VODAS VODER VoDSL VoFR VOGAD VoHDLC VoIP VoIPF VOL VOLCAS VOM VoMBN VON VoP VOR VORC VORDAC Vortac VORTAC VOST VOTS VOW VOX

Virtual Network 1. Vertical Network Analyzer 2. Vector Network Analyzer Virtual private Network (MCI) Visible and Near-Infrared Radiometer (remote sensing) Via Net Loss (transmission) Via Net Loss Factor (parameter) Voice News Network (broadcaster) 1. Virtual Network Service 2. Virtual Network System Veriﬁcation Ofﬁce 1. Variable Optical Attenuator 2. Voice Of America (broadcaster) Voice over ATM (service) Voice over Broad-Band Virtual Operator’s Console voice coder Video-on-Demand (service) Voice Operated Device Anti-Sing (telephone circuits) Voice Operation Demonstrator Voice over DSL (service) Voice over Frame-Relay (service) Voice-Oriented Gain-Adjusting Device Voice over HDLC (service) Voice over Internet Protocol (service) Voice over Internet Protocol Forum volume control (circuit diagrams) Voice-Operated Loss-Control And Signaling (device) Volt-Ohm-Milliameter (test equipment) Voice-over-Multiservice Broadband Network Voice-On-the-Net (service) Voice-over-Packet (service) VHF Omnidirectional Range (navigation system) Voice-Operated Relay Circuit VHF Omnidirectional Range and Distance-measuring equipment for Area Coverage VHF omnidirectional range tacan (air navigation) VOR collocated and/or combined with TACAN VESA Open Set Top (group) VMS OSI Transport Service Voice Order Wire 1. Voice-Operated Transmit 2. Latin word for Voice meaning Telephone number other than that of Fax number (on business cards)

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Vv

Voxel VoxML VP VP PBX VP TEL VPA VPACK VPAR VPC VPCI VPD VPDN VPDS VPE VPEC VPI VPIM VPL VPM VPN VPO VPOTS VPP VPS VPSN VPT VPU VPXC VQ VQFP VQL

Volume pixel (3D image) Voice Markup Language (programming) 1. Voice Port 2. Virtual Path (MUX) 3. Video Processor Voice Port PBX Voice Port Telephone 1. Variable Power Attenuator 2. Virtual Path Adaptation 3. Voice Port Adapter Vertical Package Voice Port Adapter Rack 1. Voice Port Cluster 2. Virtual Path Connection (ATM) Virtual Path Connection Identiﬁer 1. Variable Phase Divider 2. Virtual Printer Device driver 3. Vapor-Phase Dissolution (semiconductors) Virtual Private Data Network Virtual Private Data Service (MCI) Vapor-Phase Epitaxy (semiconductors) Virginia Power Electronics Center (U.S.A.) 1. Variable Path Identiﬁer (ATM) 2. Virtual Packet Identiﬁer (MPLS) Voice Proﬁle for Internet Messaging Virtual Path Link (ATM) Voice Processing Module (Sprint) Virtual Private Network (Internet) Pinch-Off Voltage (FETs) Very Plain Old Telephone Service VXI Plug-and-Play 1. Variable Phase Shifter 2. Vapor-Phase Soldering Virtual Path Sub-Network 1. Virtual Path Termination 2. Virtual Private Trunking 3. Virtual Printer Technology 1. Virtual Physical Unit 2. Voice Processing Unit Virtual Path Cross-Connect (MUX) Vector Quantization Very-ﬁne-pitch Quad Flat Pack (microchips) Variable Quantizing Level

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363

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

VR VRAM VRC VRD VRID VRM VRML Vrms VROOMM VRPRS VRRP VRU vs VS

VS&F VS/VD VSA VSAC VSAT VSB VSC VSE VSELP VSIM VSM VSNET VSNL VSO VSOP VSR Vss VSS

1. Virtual Reality (ICT) 2. Voice Recognition 3. Voltage Regulator (electronics) Video RAM (memory) Vertical Redundancy Check (transmission) 1. Virtual Ring Down 2. Virtual Retina Display Virtual Router Identiﬁer Voice Recognition Module 1. Virtual Reality Modeling Language (programming) 2. Virtual Reality Markup Language (programming) Volt root-mean-square (electronics) Virtual Run-time Object-Oriented Memory Manager Virtual Route Pacing Response in SNA Virtual Router Redundancy Protocol (IETF) Voice Response Unit versus (technical curves) 1. Virtual Scheduling (ATM) 2. Virtual Source 3. Virtual Storage 4. Vertical Synchronization Voice Store and Forward (service) Virtual Source/Virtual Destination Virtual Scheduling Algorithm Very Small Aperture Check Very Small Aperture Terminal (satcom) 1. Vestigial Side-Band (modulation) 2. VME Subsystem Bus 1. Vertical Service Code (telephony) 2. Virtual Switch Controller (telephony) 3. Variable Speech Control (tape recording) Voice Services Equipment Vector Sum Excited Linear Predictive coding (voice coding) Virtual Surface Image Memory Vestigial-Sideband Modulation Virtual SS7 Network Videsh Sanchar Nigam, Ltd (Indian operator) Very Small Outline Very Small Outline Package (Japanese) Very Short Reach (ﬁber optics) Voltage Source-Source (electronics) 1. Voice Server System 2. VHDL System Simulator

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Vv

VSW VSWR VSX VSYNC VT

VT fuse VT2 VT6 VTA VTAC VTAM VTC VTCO VTD VTG VTI VTIR VTM VTN VTNS VTO VToA VTOH VTP VTPP VTR VTS VTTH VTU VTU-C VTU-O

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Voice Switcher Voltage Standing-Wave Ratio (transmission) Veriﬁcation Suite for X/open Vertical Sync (video signals) 1. Virtual Tributary (SONET) 2. Virtual Terminal (ISO) 3. Virtual Trunk 4. Vertical Tabulation (character) 5. Video Teleconferencing Variable-Time fuse Virtual Tributary-2 Virtual Tributary-6 1. Video Terminal Adapter (ISDN) 2. Virtual Trunk Agent Vermont Telecommunications Applications Center Virtual Telecommunications Access Method (IBM PCs) Video Tele-Conference (U.S. Air Force) Voltage–Temperature Cut-Off (battery charging) Virtual Timer Device driver 1. Voltage Timing Generator 2. Virtual Tributary Group Vietnam Telecom International Visible and Thermal Infrared Radiometer (remote sensing) 1. Voltage-Tunable Magnetron 2. Voltage Transformation Module 3. Vessel Trafﬁc Management (shipping) Vendor Type Number Virtual Telecommunications Network Services Voltage Tuned Oscillator Voice and Telephony over ATM (service) Virtual Tributary Overhead 1. Virtual Trunking Protocol (Ethernet) 2. Virtual Terminal Protocol (ISO) Variable Term Pricing Plan (AT&T) Video-Tape Recorder (equipment) 1. Vehicular Technology Society 2. Vessel Trafﬁc Service (navigation) 3. Virtual Terminal Service Video To The Home 1. Voucherless Top Up 2. Video Teleconferencing Unit VDSL Transmission Unit—Central Ofﬁce VDSL Transmission Unit—ONU

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

VTU-R VTVM VTX VVA VU VU Meter VUG VUI VVA VWP VxD VXI VXIbus VXML VXO VY

VDSL Transmission Unit—Remote Vacuum-Tube Voltmeter (test equipment) Videotex Voltage-Variable Attenuator Volume Unit (speech power parameter) Volume Unit Meter Voice User Group Video User Interface Voltage-Variable Attenuator (microwave) Variable Wavelength Path Virtual device Driver VME Extension for Instrumentation VME bus Extension for Instrumentation Voice XML (programming language) Variable Crystal Oscillator (electronics) Very (Morse code transmissions)

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Ww W W-band W-CDMA W-DCS W-OFDM W/G W/sr W3 W3C W3C2 WA DSP WAA WAAS WABI WAC WACK WACS WADP WADS WAE

1. Symbol for Watt (unit of electric power) 2. Symbol for wideband 3. Wait (Hayes compatible modems) Radio frequency band ranging from 75 to 110 GHz (radar) Wideband CDMA (access) Wideband Digital Cross-connect System Wideband OFDM (transmission) Waveguide Watt per steradian World-Wide Web World-Wide Web Consortium (standards organization) World-Wide Web Conference Committee Wideband Acquisition—Digital Signal Processing Wireless Advertising Association Wide-Area Augmentation System (navigation) Windows Application Binary Interface (software) Wireless Access Controller Wait before transmitting positive Acknowledgement White Alice Communications System (AT&T) Wireless Application Delivery Platform Wide-Area Data Service Wireless Application Environment 367

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W

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

WAG WAGPS WAIP WAIS WAM WAN WANMC WAP WAPvert WAR WARC WARC-G WARC-ST wares WAS WASI WASO WASP WATM WATS WATSS WATTC .wav WAW WAWS Wb WB WBA WBC WBCS WBD WBEAF WBEM WBFH WBFM WBMCS

Wireless Application Group (WAP Forum) Wireless Assisted Global Positioning System Wireless Application Infrastructure Provider Wide-Area Information Server (Internet) Wireless Spam Wide-Area Network WAN Management Center 1. Wireless Application Protocol 2. Wireless Access Point An advertisement on a WAP device Wireless Application Reader (WAP) World Administrative Radio Conference (ITU events) WARC—General (ITU) WARC for Space Telecommunications softwares (ICT) Wireless Access System Wide-Area Service Identiﬁer Western-Area Switch Operations Wireless Application Service Provider Wireless ATM Wide-Area Telephone Services (AT&T) Wide-Area Telephone Service System World Administrative Telegraph and Telephone Conference Name extension for Windows waveform audio format ﬁles Waiter-Actor-Webmaster Washington Area Wideband System Weber (unit of magnetic ﬂux) 1. Wide-Band 2. Wire Bonded Wireless Broadcast Access 1. Wide-Band Channel (FDDI) 2. Wide-Band Combiner 1. Wide-Band Communications Service 2. Wide-Band Communications System Wide-Band Data (channel) Wide-Band Earth station Antenna Feed (Intelsat) Web-Based Enterprise Management (network management) Wide-Band Frequency Hopping (FCC) Wide-Band Frequency Modulation Wireless Broadband Multimedia Communications Systems

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Ww

WBPA WBPM WBT WBTIC WBVTR WC WCA WCAPs WCAV WCBC WCC WCCP WCDMA WCP

WCS WCT WCV WD WDA WDCS WDEF WDF WDGPS WDL WDM WDMA WDMUX WDP WDT WDU Web Webcam Webcast Webinar WebNFS Webphone WebTV Webzine

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Wide-Band Power Ampliﬁer (Intelsat) Wide-Band Phase Modulation Web-Based Training (e-learning) Web-Based Training Information Center (e-learning) Wide-Band Video Tape Recorder Wireless Consortium 1. Web Clipping Application 2. Wireless Communications Association Wireless Competitive Access Providers Web Clipping Application Viewer West Coast Billing Center Wireline Common Carrier Web-Cache Control Protocol Wideband CDMA (IMT-2000 access) 1. Wireless Certiﬁcate Proﬁle (WAP Forum) 2. Wireless Communication Platform/Product 3. Wireless Communications Protocol 4. Web Clipping Proxy (server) Wireless Communications Services WIPO Copyright Treaty Weighted Call Value 1. Withdrawn and Deleted 2. Wavelength Division Wireless Digital Assistant Wideband Digital Cross-connect System Windows Deﬁnition Function (Macintosh application) Wireless Data Forum Wide-area Differential GPS Windows Driver Library Wavelength-Division Multiplexing Wavelength-Division Multiple Access Wavelength Demultiplexer 1. Workforce Development Program 2. Wireless Datagram Protocol (WAP Forum) Watch-Dog Timer Winchester Drive Unit World-Wide Web Web digital video camera A Broadcast by using World Wide Web Web-based seminar Web Network File System (client/server protocol) Internet telephone A Web access device for that uses a TV as a display Web-based magazine

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

WEC WECA WECC WECO WEEE WELL WEP WESTAR WFC WFM WFQ WFS WFW WFWG WG WGDTB WGET WGIG WGIH WGN WGS Wh WH Wi-Fi Wi-Fi5 Wi-LAN WIA WIC WID WIDS WIFS WIG WiLL WIM WiMAX WIMP

Western Electric Company Wireless Ethernet Compatibility Alliance Web-Enabled Contact Center Western Electric Company Waste from Electrical and Electronic Equipment directive Whole Earth Lectronic Link (Web site) Wired Equivalency Privacy (LANs) Western-states Air Resources Council Winchester Floppy Controller Wired For Management Baseline (Intel) Weighted Fair Queuing (data transmission) Woodstock File Server (Xerox) Windows For Workgroups Windows For Work-Groups Working Group (IEEE) Working Group on Digital Television Broadcasting Working Group on Emergency Telecommunications (ITU) Working Group on Internet Governance (United Nations) Working Group on Information Highway (TSACC) White Gaussian Noise Worldwide Geodetic System Watt-hour (power) 1. West Hemispheric beam 2. Western Host Wireless Fidelity (IEEE) Wireless Fidelity at 5 GHz range (IEEE) Wireless LAN 1. World Internetworking Alliance (Internet) 2. Wireless Institute of Australia WAN Interface Card (Cisco) 1. Wireless Integration Device 2. Wireless Interface Device Wireless Intrusion Detection Systems Wide-Field Sensor (remote sensing) Wireless Interoperability Group (WAP Forum) Wireless Local Loop system (Motorola) 1. WAP Identity Module 2. Wireless Instant Messaging (cellular networks) Worldwide interoperability for Microwave Access (standard) Windows Icons Menus Pointing device (ICT)

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Ww

WIN WIN95 WIN98 WIN2000 WIN CE Windows ME Windows NT WINDS WINF WinG WinISDN WINS WinSock Wintel WIP WIPO WISP WIT WITS WITSA WIXC wizywig WLAN WLANA WLI WLIF WLL WLNP WLRL WM .wma WMAN WMATV .wmf WMF

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1. Wireless Intelligent Network 2. Wireless In-building Network Windows 95 Windows 98 Windows 2000 Windows CE Windows Millennium Edition Windows New Technology Wideband Inter Networking engineering test and Demonstration Satellite (Japan) Wireless Information Networks Forum, Inc Windows games An ISDN communications API designed for Windows (interface) Windows Internet Naming Service Windows Socket API (program) A computer using Windows Operating System and Intel’ CPU 1. Washington Internet Project 2. Work In Process (equipment) World Intellectual Property Organization (Geneva) Wireless Internet Service Provider Washington International Teleport 1. Wireless Interface Telephone System 2. Washington Integrated Telecommunications System (U.S.A.) World Information Technology and Services Alliance Wavelength Interchanging Cross-Connect (ﬁber optics) Same as WYSIWYG Wireless Local-Area Network Wireless LAN Alliance (U.S. standards organization) Wireless LAN Interoperability Wireless LAN Interoperability Forum Wireless Local Loop Wireless Local Number Portability Wireless LAN Research Laboratory (U.S.A.) Wavelength Modulation Name extension for Windows Media Audio ﬁles (computer) Wireless Metropolitan-Area Network Wireless Master Antenna TV system Name extension for WMF ﬁles (graphics) 1. Windows Metaﬁle Format (Image format)

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WMI WML WMO WMPN WMUX .wmv WOL WOM WORA WORM WORN WOS WOSA WOTAN WOTS .wp WP WP/8B WPA WPABX WPAD WPAN WPBX .wpg WPG WPKI WPM WPS WQAM WR WRAM WRBYV WRC

Comprehensive Glossary of Telecom Abbreviations and Acronyms

2. Wireless Multimedia Forum Windows Management Instrumentation (Microsoft) 1. Wireless Markup Language (programming) 2. Website Meta Language (programming) World Meteorological Organization World’s Most Powerful Network (consortium) Wavelength Multiplexer Name extension for Windows Media Video ﬁles (computer) Wake-On-LAN (computer motherboard) Write-Only Memory (data storage) “Write Once, Run Anywhere” (Java slogan) Write Once, Read Many times (optical memory disks) Write Once, Read Never (as a joke) Wholesale Operator Service Windows Open System Architecture Wavelength-Agile Optical Transport and Access Network project Wireless Ofﬁce Telecommunications System Name extension for Word Perfect word processor ﬁles (computer) 1. Word Processing 2. Wire Photo Working Party 8B (ITU-R) Wi-Fi Protected Access Wireless PABX Web Proxy Auto-Discovery (protocol) Wireless Personal-Area Network Wireless Private Branch Exchange Name extension for WordPerfect Graphics format ﬁles (graphics) Wireless Protocols Group (WAP Forum) 1. Wireless Public Key Infrastructure 2. Wearable Public Key Infrastructure Words Per Minute (parameter) 1. Words Per Second (parameter) 2. Wireless Priority Services 3. Work Place Shell (OS/2) Weighted Qaudrature Amplitude Modulation 1. Withdrawn and Replaced 2. Write (logic signal) Windows RAM (memory) White, Red, Blue, Yellow, and Violet (telephone cable) World Radiocommunications Conference (ITU)

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Ww

WREC WRED .wri WRL WRS WRSS WRU Ws WS WS-ANI WSA WSC WSDL WSEAS WSF WSG WSI WSIS WSP WST WSTA WSW WSXC WT WTA WTAC WTB WTDC WTLS WTN WTNG WTO WTP WTPF WTSC WU-ATS WUD

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Web Replication and Caching Weighted Random Early Detection (QoS) Name extension for Microsoft Write format ﬁles (computer) Wireless Rural Loop Worldwide Reference System (Landsat) Western Region Switch Support “Who Are You” (telex control character) Wattsecond (power) Work Station Wireless Subscriber—Automatic Number Identiﬁcation Wireless Specialty Apparatus Company 1. Wireless Switching Center 2. Wireless Server Certiﬁcate Web Service Description Language (programming) World Scientiﬁc and Engineering Academy and Society Work Station Function block Wireless Security Group (WAP Forum) 1. Wireless Systems International 2. Wafer Scale Integration (microchips) World Summit on the Information Society 1. Wireless Service Provider 2. Wireless Session Protocol 1. WAP Security Toolkit 2. Wireless Subscriber Terminal Wall Street Telecommunications Association (standards) World Space Week (events) Wavelength Selective Cross-Connect (ﬁber optics) Wireless Telephony Wireless Telephony Application (WAP Forum) World Telecommunications Advisory Council (ITU) Wireless Telecommunications Bureau (FCC) World Telecommunications Development Conference Wireless Transport Layer Security (WAP Forum) Working Telephone Number Waiting World Trade Organization (Switzerland) Wireless Transaction Protocol World Telecommunication Policy Forum World Telecommunications Standardization Con-ference Western Union—Advanced Transmission Systems Would (Morse code transmissions)

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

WUI WUT WV WVDC WVI WVTR WW WWAN WWDD WWDM WWDSA WWMCCS WWNWS WWV WWW WWWC WX Wz WZ1

1. Web User Interface (GUI) 2. Western Union International (MCI) Wafer Under Test Working Voltage (electronics) Working Volts DC (power) Web Voice Integration Wideband Video Tape Recorder 1. Wire-Wound (electronics) 2. Wire-Wrap (electronics) Wireless Wide-Area Network World-Wide Direct Dialing Wide Wavelength-Division Multiplexing (GBE) World Wide Digital System Architecture World Wide Military Command and Control System World-Wide Navigational Warning Service (IMO) World-Wide Vacuum 1. World-Wide Web (Internet) 2. World Weather Watch (remote sensing) World-Wide Web Consortium Weather Report (Morse code transmissions) West Zone beam World Zone 1

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Xx X

X.25 X-Band X-MOS X-Off X-On X-On/X-Off X-strap XA XA-SMDS XAPIA XAUI Xbar

1. Symbol for exchange or interchange 2. Symbol for extension 3. Symbol for words commencing with letters sounding like ‘X’ such as DBx which stands for Data Base Accelerator 4. Sign for cross or cross-connection or coupling 5. Sign of preﬁx trans- (from one place or state to another) 6. Symbol for a Crystal component 7. Symbol for an unknown quantity or distance ITU protocol standard for WAN communications Radio Frequency band (8 GHz–12 GHz) High-speed MOS (semiconductors) Control character to stop information ﬂow Control character to start information ﬂow Transmitter On and Transmitter Off Cross-strap (Intelsat) 1. Extended Architecture (CD-ROM) 2. Exchange Access Exchange Access—SMDS X.400 Application Program Interface Association 10GbE Attachment Unit Interface Crossbar 375

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X

376

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Comprehensive Glossary of Telecom Abbreviations and Acronyms

XC XCA XCE XCM XCMD XCOPY XCVR XDCR XDF XDI XDMA XDMCP XDP XDR xDSL xEMS XENIX XFCB XFCN XFN XFR XGA XGL XHTML XID XIF XIP XIPS XIWT xLC XL XLib XLIU XLL XLR XMA Xmission

Cross-Connect (MUX) Extended Communication Adapter 1. Transponder Command Electronics 2. Transponder Control Electronics 1. Cross-Connect Module (MUX) 2. Cross-Connect Multiplexer (MUX) External Command (hyper card) Copy Extended (MS-DOS Command) Transceiver (Morse code transmissions) Transducer (electronics) Extended Distance Feature XRI Data Interchange Xing Distributed Media Architecture (Xing Corporation) X Display Manager Control Protocol Extra Device Port (Panasonic) 1. External Data Representation 2. Exchange Data Representative A generic term for DSL technologies (access) xDSL Element Manager System Microsoft version of UNIX for microprocessors (OS) Extra-Fast Complementary Bipolar External Function (hyper card) X/Open Federated Naming (Sun Microsystems) Transfer 1. Extended Graphics Adapter (1024!768 pixel monitors) 2. Extended Graphics Array (monitors standard) Extended Graphics Library 1. XML—compatible Version of HTML (programming) 2. Extensible HTML (programming) Exchange Identiﬁcation XPD Improvement Factor Execute-In-Place (graphics) Xenon Ion Propulsion Subsystem Cross-Industry Working Team xDSL Line Card Symbol for Inductive Reactance X Library (Windows System) X.25/X.75 Link Interface Unit Extensible Linking Language (programming) X-Series Lockheed Rubber (connectors) Extended Memory Access Transmission (Ham radio)

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Xx

Xmit Xmitter XMF XML XMP XMPP XMS XMS API XMSN XMT XMTR XMUX XnLC XNS XO XOFF XOMAPI XON XON/XOFF XOR Xover XPAD XPC XPD XPDR XPG XPI XPIC XPL XPM X-POL Xponder XPS XRB Xref XRF

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Transmit (Ham radio) Transmitter (Ham radio) eXtensible Music Format Extensible Markup Language (programming) X/Open Management Protocol Extensible Messaging and Presence Protocol Extended Memory Speciﬁcation X.400 Message Store Application Program Interface Transmission Transmit (Ham radio) Transmitter (Morse code transmissions) Transmultiplexer XDSL Line Card in Access node Express Xerox Network Systems (protocol) Crystal Oscillator Transmitter Off (control character) X.400 OSI data Manipulation Application Program Interface Transmitter On (control character) Transmitter On and Transmitter Off (protocol) Exclusive-OR gate (digital electronics) Crossover External Packet Assembler/Disassembler Extended Processing Cabinet 1. Transponder 2. Cross-Polarization Discrimination 3. Cross-Polarization Decoupling Transponder X/Open Portability Guide (standard group) 1. Cross-Polarization Isolation (Intelsat) 2. Cross-Polarization Interference (Intelsat) Cross-Polarization Interference Canceller (Intelsat) Cross-Polarization Level 1. Extended Peripheral Module 2. Cross-Phase Modulation 1. Cross-Polarized (Intelsat) 2. Cross-Polarization (antennas) Transponder X-ray Photoelectron Spectroscopy Transmit Reference Burst Cross-reference 1. Extended Recovery Facility 2. X-Ray Fluorescence (spectroscopy)

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X

378

&

XSG XSL XSMP XT Xtal Xtalk XTELs Xterm XTI XTL XTP XUI XWA XWS XXX XXXX XYL

Comprehensive Glossary of Telecom Abbreviations and Acronyms

1. Extended Service Group 2. X.25 Service Group Extensible Style-sheet Language (programming) X Session Manager Protocol 1. Crosstalk 2. Extended Technology (IBM PCs) Crystal Crosstalk Teleservices protocol (Sun Solaris) A terminal for the X Windows system X/Open Transport Interface Teleservices architecture for Sun Solaris (Sun Microsystems) 1. Express Transport Protocol 2. Express Transfer Protocol X Windows System User Interface (toolkit) Experimental Wireless Apparatus X Windows System Triple X (protocol) The last four digits of a telephone number Former Young Lady (morse code transmission)

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Yy

y Y

Y cable Y/C Y2K YAG YAHOO

YB YBCO yd yd2 YEL YIG

Symbol for preﬁx yocto-, denoting 10K24 or 2K80 1. Symbol for preﬁx yotta-, denoting 1024 or 280 2. Symbol for admittance (electronics) 3. Symbol for Yttrium 4. Symbol for luminosity A Y-shaped cable luminosity and Color splitter (color image encoding) Year 2000 (Millennium Bug) Yttrium–Aluminium Garnet crystalline material (laser electronics) 1. Yet Another Hierarchically Ofﬁcious Oracle (Web portal) 2. Yet Another Hierarchically Organized Oracle (Web portal) Yottabyte, which is 1024 or 1024 times zettabyte Yttrium–Barium–Copper–Oxide (microwave devices) yard (unit of area) square yard yellow Yttrium–Iron Garnet crystalline material (microwave devices) 379

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Y

380

YL YP YTF YTO

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Young Lady (Morse code transmissions) Yellow Pages (British Telecom) YIG Tuned Filter (microwave) YIG-Tuned Oscillator

AU5866—CHAPTER Y—Y—12/7/2007—11:35—VELU—274427—XML MODEL E – pp. 379–380

Zz z .z Z Z time Z-CAL Z-marker Z0 Z80 ZAK ZAW ZB ZBTSI ZCS ZD ZDNet ZDSF ZDW ZIF socket ZiffNet

Symbol for preﬁx zepto-, which is 10K21 or 2K70 Name extension for UNIX ﬁles compressed with the g zip 1. Symbol for preﬁx zetta-, which is 1021 or 270 2. Symbol for impedance (electric circuits) 3. Zulu time Zebra time Zero Range Calibration (Intelsat) Zone marker Characteristic Impedance (transmission line) An 8-bit microprocessor developed by Zilog Company Zero Administration Kit (software) Zero Administration Windows (operating system) Zettabyte, which is 1021 or 1024 times Exabytes Zero Byte Time Slot Interchange (control technique) 1. Zero Code Suppression 2. Zero Current Switching Zero Defects Ziff Davis Network Zero Dispersion Shifted Fiber Zero Dispersion Wavelength Zero Insertion Force socket (Intel) See ZDNet 381

AU5866—CHAPTER Z—Z—12/7/2007—11:36—VELU—274428—XML MODEL E – pp. 381–382

Z

382

Zin .zip Zip ZIP Ziv Zl ZnO .zoo Zout ZRL ZRT Zs zsh ZT ZTLP ZUM ZV ZVA ZVS

&

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Input Impedance Name extension for archive ﬁles compressed by PKZIP zipped 1. Zone Information Protocol 2. Zone Information Plan 3. Zigzag Inline Package Lempel–Ziv load Impedance Zinc Oxide (semiconductors) Name extension for archive ﬁles Zoo compression utility output Impedance Zero Relative Level Zero Range Transponder (Intelsat) source Impedance Z shell (UNIX) Zone Time (Intelsat) Zero Transmission Level Point (telephony) Zone Usage Measured Zoomed Video Zero Voltage Activated circuit (electronics) Zero Voltage Switching

AU5866—CHAPTER Z—Z—12/7/2007—11:36—VELU—274428—XML MODEL E – pp. 381–382

Annex-A (Special Characters) . ’

"

“ ” ‘ ’ — d / \ : ;

dot or period sign 1. apostrophe or quote sign 2. meaning “feet” used when deﬁning length of something 3. meaning “minutes” used when deﬁning latitude and longitude 1. Quotation mark (called ditto) 2. meaning “inches” used when deﬁning dimensions of something 3. meaning “seconds” used when deﬁning latitudes and longitudes 4. the same word as above Double opening quote Double closing quote Single opening quote Single closing quote Em dash 1. En dash (also called hyphen) 2. meaning “to” when deﬁning ranges of values 1. Oblique stroke or Forward slash (also called diagonal) 2. Fraction sign meaning “to” or “conversion to” Backward Slash (also called back slash) Colon Semicolon 383

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384

&

Z s # z O ! 8 8C 8F 8R & @ D D-b D-l D-S 3 l l0 lcc m mA mbar mC mCi mF mH mLx mm mmho mU mp mrd mR mrem mrep ms mS mV mm mW

Comprehensive Glossary of Telecom Abbreviations and Acronyms

Equals; is the same as (mathematics) Does not equal; is different from Sign of “number” (also called Hash) Is approximately equal to (mathematics) Is more than (mathematics) Is less than (mathematics) Symbol for degree (plane angle) Symbol for degree Celsius Symbol for degree Fahrenheit Symbol for degree Rankine (absolute temperature scale) Sign of “and” (called Ampersand) “At” sign (Internet e-mail addresses) Greek letter “delta” (sign of refractive index contrast) Delta–Beta (switch) Delta–Lambda (spectral width) Delta–Sigma (modulation) Greek letter “epsilon” (sign of electrical permittivity) Greek letter “Lambda” (sign of wavelength) Zero-dispersion wavelength (ﬁber optics) cutoff wavelength (ﬁber optics) 1. Greek Letter “mu” 2. Symbol for permeability 3. Sign of preﬁx micro-, (one-millionth or 10K6) microampere (electronics) microbar microcomputer microcurie microfarad (electronics) microhenry (electronics) microlux micrometer or micron micromho (electronics) microohm (electronics) microprocessor microrad microroentgen microrem microrep microsecond microsiemens microvolt (electronics) micromicro (pico-) microwatt (power)

AU5866—CHAPTER —AnnexA—12/7/2007—11:37—VELU—274429—XML MODEL E – pp. 383–385

Annex-A (Special Characters)

u U U/V [ 4 FM p ? r s * q w e $ £ V ¥ %

&

385

Greek letter “omega”; symbol for angular frequency 1. Greek letter “omega” 2. Sign of ohm (unit of resistance and impedance) ohm per Volt Upside-down capital omega (unit of conductivity ‘mho”) Greek letter “phi” (sign of angle of phase) Phase Modulation Greek letter “pi”, symbol for the number 3.1416 (mathematics) Question mark Greek letter “rho” (unit of electric charge density) Greek letter “sigma” (unit of electrical conductivity) Symbol for marking an important point (called asterisk, splat, star) Copyright Registered Trademark U.S. Dollar (currency) Pound Sterling (currency) Euro (currency) Yen (currency) Percent

AU5866—CHAPTER —AnnexA—12/7/2007—11:37—VELU—274429—XML MODEL E – pp. 383–385

Annex-B (Metric Preﬁxes)

Symbol

Y Z E P T G M k h da d c m m n p f a z y

Preﬁx

yottazettaexapetaterragigamegakilohectodeca decicentimillimicronanopicofemtoattozeptoyocto-

Numerical

1,000,000,000,000,000,000,000,000 1,000,000,000,000,000,000,000 1,000,000,000,000,000,000 1,000,000,000,000,000 1,000,000,000,000 1,000,000,000 1,000,000 1000 100 10 0.1 0.01 0.001 0.000,001 0.000,000,001 0.000,000,000,001 0.000,000,000,000,001 0.000,000,000,000,000,001 0.000,000,000,000,000,000,001 0.000,000,000,000,000,000,000,001

Exponential

1024 1021 1018 1015 1012 109 106 103 102 101 10K1 10K2 10K3 10K6 10K9 10K12 10K15 10K18 10K21 10K24

387

AU5866—CHAPTER —AnnexB—12/7/2007—12:24—GANESHV—274430—XML MODEL E – pp. 387