Abbrevations

3. Abbreviations and Acronyms (Please be patient--this page takes awhile to load)

a A Å AAR AARTS ABR ABS ABSBH ac ACC ACD ac-dc ACG ACH ACK ACM ACP ACSB ACSE ACTEL ACTL ACTS ACU A-D ADC ADCCP ADH ADMD ADP ADPCM

atto (10-18) amperes (current) angstrom automatic alternate routing automatic audio remote test set available bit rate alternate billing services average busy season busy hour alternating current access information automatic callback calling automatic call distributor alternating current - direct current automatic call gap attempts per circuit hour acknowledge character address complete message action point amplitude companded single-sideband association control service element access telephone number access customer terminal location Advanced Communications Technology Satellite automated coin toll service automatic calling unit analog-to-digital analog-to-digital converter analog-to-digital conversion Advanced Data Communication Control Procedures automatic data handling administration management domain automatic data processing adaptive differential pulse-code modulation

ADPE ADPSSO ADS ADU ADX AECS AERM AES AF AFC AFNOR AFRS AGC AGE AI AIC AIG AIM AIN AIOD AIS AITS ASIC AJ AK ALBO ALC ALE ALGOL ALS ALU

automatic data processing equipment automatic data processing system security officer auxiliary data system automatic dialing unit automatic data exchange Aeronautical Emergency Communications System [Plan] alignment error rate monitor Advanced Encryption Standard audio frequency area frequency coordinator automatic frequency control Association Francaise de Normalisation Armed Forces Radio Service automatic gain control aerospace ground equipment artificial intelligence action indicator Automatic Intercept Center address indicator group address indicating group amplitude intensity modulation advanced intelligent network automatic identified outward dialing automated information system alarm indication signal automatic intercept system acknowledged information transfer service application-specific integrated circuits anti-jamming data acknowledgement (see also “ACK”) automatic line buildout automatic level control automatic load control automatic link establishment Algorithmic Computer Language application layer structure arithmetic and logic unit

A/m AM AMA AMARC AMAT AMC AME AMI AM/PM/VSB AMPS AMPSSO AMSC AMTS ANI ANL ANM ANMCC ANS ANSI AP APAB APC APCO APD, apd, a.p.d. APDU API APL APND APOT APK APS APSB ARP

amperes per meter amplitude modulation automatic message accounting automatic message accounting recording center automatic message accounting transmitter administrative management complex amplitude modulation equivalent automatic message exchange alternate mark inversion [signal] amplitude modulation/phase modulation/vestigial sideband automatic message processing system advanced mobile phone system automated message processing system security officer American Mobile Satellite Corporation automated maritime telecommunications system automatic number identification automatic noise limiter answer message Alternate National Military Command Center American National Standard American National Standards Institute anomalous propagation application process all-primary / all-backup adaptive predictive coding Association of Public Safety Communications Officials avalanche photodiode application protocol data unit application program interface average picture level all-primary / no-backup additional point of termination amplitude phase-shift keying automatic protection switching all-primary / some backup address resolution protocol

ARPA ARPANET ARQ ARS ARSR ARU ASC ASC-EC ASCII ASE ASG ASELP ASIC ASN.1 ASP

ASR ASR NO AT ATACS ATB ATCRBS ATDM ATE ATIS ATM ATN ATRS ATV au

Advanced Research Projects Agency [now DARPA] Advanced Research Projects Agency Network automatic repeat-request automatic route selection air route surveillance radar audio response unit AUTODIN Switching Center access service company access service coordinator access service coordination exchange company American Standard Code for Information Interchange application service element access service group algebraic sum excited linear prediction application-specific integrated circuits abstract syntax notation one aggregated switch procurement application service part adjunct service point assignment source point access service request airport surveillance radar automatic send and receive access service request number access tandem Army Tactical Communications System all trunks busy air traffic control radar beacon system asynchronous time-division multiplexing automatic test equipment Alliance for Telecommunications Industry Solutions [formerly ECSA] advanced testing method asynchronous transfer mode account telephone number automated trouble reporting system advanced television astronomical unit

access unit AUI attachment unit interface AUTODIN Automatic Digital Network AUTOSEVOCOM Automatic Secure Voice Communications Network AUTOVON Automatic Voice Network AV audiovisual AVD alternate voice/data AWG American wire gauge AWGN additive white Gaussian noise AZ azimuth b bit bel B byte BAAD band advance balun balanced to unbalanced basecom base communications BASIC beginners' all-purpose symbolic instruction code block check character BCC blocked calls cleared binary-coded decimal BCD binary-coded decimal notation blocked calls delayed BCI bit-count integrity BCST broadcast Bd baud B8ZS bipolar with eight-zero substitution bell BEL character BER bit error ratio BERT bit error ratio tester BETRS basic exchange telecommunications radio service BEX broadband exchange BHMC busy hour minutes of capacity BIB backward indicator bit BIBR backward indicator bit received BIBT backward indicator bit to be transmitted BIBX backward indicator bit expected

BIC BIH BIP B-ISDN bi-sync bit BIT BITE BIU BLA BLER BLO BLR BLS BNF BOC BPSK bpi b/s (formerly “bpi”) b/in (formerly “bps”) BPSK BPSS BR BRAN BRI BS BSA BSBH BSE BSI B6ZS BSM

bearer identification code International Time Bureau bit interleaved parity broadband ISDN binary synchronous [communication] binary digit built-in test built-in test equipment bus interface unit blocking acknowledgment message block error ratio blocking message blocking/unblocking signal reception blocking/unblocking signal sending Backus Naur form Bell Operating Company binary phase-shift keying bits per inch bytes per inch bits per second bits per inch binary phase-shift keying basic packet switched service bit rate broadband radio access networks basic rate interface base station basic serving arrangement busy season busy hour basic service element basic serving element British Standards Institution bipolar with six-zero substitution backward setup message

BSN BSNR BSNT BSP BSS B3ZS BTN BW c CA CACS CAD CAG CAI CAISS CAM CAMA CAN CAP CARS CAS CASE CATLAS CATV CB CBA CBAN CBD CBMS

backward sequence number backward sequence number received backward sequence number of next signal unit to be transmitted Bell System Practices base station system basic service set bipolar with three-zero substitution billed telephone number billing telephone number bandwidth centi (10-2) communications assets centralized alarm control system call denial computer-aided design computer-aided drafting combined access group common air interface common air interfaces for satellite systems computer-aided manufacturing centralized automatic message accounting cancel character competitive access provider customer administration panel cable television relay service [station] centralized attendant services call associated signaling computer-aided software engineering computer-assisted software engineering centralized automatic trouble locating and analysis system cable TV community antenna television citizens band changeback-acknowledgment signal Centrex billing account number changeback-declaration signal computer based messaging system

CBN CBX CC CCBS CCC C2 C3 C3CM C3I CCA CCD CCH CCIF CIP CCIR CCIS CCIT CCITT CCL CCMDS CCO CC-PIC CCS CCSA CCS7 CCTV CCW cd CD CDA CDF

common bonding network computer branch exchange connection confirm country code completion of calls to busy subscribers clear channel capability command and control command, control and communications C3countermeasures command, control, communications and intelligence carrier-controlled approach charge-coupled device connections per circuit per hour International Telephone Consultative Committee [a predecessor to the CCITT] critical infrastructure protection International Radio Consultative Committee common-channel interoffice signaling International Telegraph Consultative Committee [a predecessor to the CCITT] International Telegraph and Telephone Consultative Committee {now ITU-T} continuous communications link common channel multipoint distribution system continuity check outgoing customer changeable primary interexchange carrier hundred call-seconds common channel signaling common control switching arrangement common channel signaling System #7 closed-circuit television cable cutoff wavelength candela collision detection, compact disk call data accumulator combined distribution frame cumulative distribution function

CDMA CDO CDPD CDPSK CDR CD ROM CDT CDU CE C-E CEF CEI CELP CEP CEPT CESID CFA CFE CFL CGAP CGB CGC cgs CGH CHOK ChR CI CIAS CIC CIF CIFAX

code-division multiple access community dial office cellular digital packet data coherent differential phase-shift keying call detail recording compact disk read-only memory call data transmitter control data terminal central display unit connection endpoint communications-electronics cable entrance facility comparably efficient interconnection connection endpoint identifier code-excited linear prediction circular error probable Conference Europeennes des Administrations des Postes et des Telecommunications caller’s emergency service ID carrier facility assignment connecting facility assignment contractor-furnished equipment call failure call gapping interval circuit group blocking acknowledgment message congestion control centimeter-gram-second charging message choke network channel reliability customer installation circuit inventory and analysis system carrier identification code circuit identification code content indicator code common intermediate format ciphered facsimile

CIGRR CINC ciphony CiR CITEL CK CKLT C/kT CKTACT CKTID CL CLASS CLC CLEI CLNS CLP cm CMDF CMDS CMI CMIP CMIS CMOS CMR CMRR CMRS CMS CNC CNCC CNI CNP CNR CNS

common interest group on rating and routing commander-in-chief ciphered telephony circuit reliability Inter-American Telecommunications Commission check bit circuit link test carrier-to-receiver noise density circuit activity circuit identification number connectionless custom local area signaling service Carriers Liaison Committee common language equipment identification connectionless network service cell loss priority (bit) centimeter combined main distributing frame combined main distribution frame centralized message data system coded mark inversion Common Management Information Protocol common management information service complementary metal oxide substrate call modification request message common-mode rejection ratio Commercial Mobile Radio Service call management system concentrator customer network control center calling number identification connection-not-possible signal carrier-to-noise ratio combat-net radio complementary network service connection-not-successful signal

C.O. COAM coax COBOL codec COG COMINT COMJAM compandor COMPUSEC COMSAT COMSEC CONEX CONUS COP COR COT COTS CPAS CPC CPE cpi cpm CPNI cps CPU C/R CR CRC

central office connection oriented customer owned and maintained equipment coaxial cable common business oriented language coder-decoder centralized ordering group communications intelligence communications jamming compressor-expander computer security Communications Satellite Corporation communications security connectivity exchange Continental United States Committee of Principals Council of Representatives customer office terminal continuity message commercial off-the-shelf cellular priority access services cellular priority access system call processing control calling party category circuit provision center customer premises equipment characters per inch counts per minute calling party number identification characters per second cycles per second [deprecated] central processing unit communications processor unit command/response field bit channel reliability circuit reliability connection request cyclic redundancy check

CRITICOM CROM CRR CRT CRTS c/s CSA CSC CSES CSMA CSMA/CA CSMA/CD CST CSU CTIA CTN CTS CTX CUG CVD CVSD cw CX cxr D* d DA D( ) da D-A

Critical Intelligence Communications control read-only memory customer requested routing circuit reset reception cathode-ray tube cellular radio telecommunications service cycles per second [deprecated] Canadian Standards Association circuit-switching center common signaling channel consecutive severely errored seconds carrier sense multiple access carrier sense multiple access with collision avoidance carrier sense multiple access with collision detection connection setup time channel service unit customer service unit Cellular Telecommunications Industry Association cut-through operation clear to send Centrex ® [service] clear to transmit closed user group chemical vapor deposition continuously variable slope delta [modulation] carrier wave continuous wave composite signaling carrier specific detectivity deci (101) directory directory assistance dispersion coefficient deka (10) digital-to-analog digital-to-analog converter

D/L DACS DAI DAO DAMA D-AMPS DARPA dB dBa dBa(F1A) dBa(HA1) dBa0 DBAS dBc dBm dBm(psoph) DBMS dBmV dBm0 dBm0p dBr dBrn dBrnC dBrnC0 dBrn(f1-f2) dBrn(144-line) DBSN dBv dBW dBx dc

downlink digital access and cross-connect system dial address incoming dial address outgoing demand assignment multiple access digital advanced mobile phone system Defense Advanced Research Projects Agency [formerly ARPA] decibel decibels adjusted noise power measured by a set with F1A-line weighting noise power measured by a set with HA1-receiver weighting noise power measured at zero transmission level point database administration system dB relative to carrier power dB referred to 1 milliwatt noise power in dBm measured by a set with psophometric weighting database management system dB referred to 1 millivolt across 75 ohms noise power in dBm referred to or measured at 0TLP noise power in dBm0 measured by a psophometric or noise measuring set having psophometric weighting power difference in dB between any point and a reference point dB above reference noise noise power in dBrn measured by a set with C-message weighting noise power in dBrnC referred to or measured at 0TLP flat noise power in dBrn noise power in dBrn measured by a set with 144-line weighting direct broadcast satellite network dB relative to 1 V (volt) peak-to-peak dB referred to 1 W (watt) dB above reference coupling direct current

DC DCA DCE DCF DCL DCM DCN DCP DCPSK DCS DCT DCTN DCWV DDD DDN DDS DEL demarc demux dequeue DES detem DEW DFI DFSK DIA DIC DID DIF DIG DIN DIP

disconnect code Defense Communications Agency (now DISA) data circuit-terminating equipment digital channel equipment data communication function direct communications link digital carrier module data communications network data collection processor duplex central processor differentially coherent phase-shift keying Defense Communications System digital carrier trunk Defense Commercial Telecommunications Network direct-current working volts direct distance dialing Defense Data Network digital data service digital data system delete character demarcation point demultiplex demultiplexing double-ended queue Data Encryption Standard detector/emitter Distant Early Warning (Line) digital facility interface double-frequency shift keying Defense Intelligence Agency digital interface controller direct inward dialing digital interface frame digital integrity group Deutsches Institut für Normung dual in-line package

DIS DISA DISC DISN DISNET DIT DIU DLA DLC DLCI DLY DL DLE DLP DL TU DM DMA DME DMS DNA DNHR DNI DNIC DNPA DNS DO DoC DOC DOD DODD DODISS

Draft International Standard Defense Information Systems Agency {formerly DCA} disconnect disconnect command Defense Information System Network Defense Integrated Secure Network directory information tree digital interface unit Defense Logistic Agency digital loop carrier Data Link control (layer) data link connection identifier delay dial data link escape character Data Link protocol digital line / trunk unit degraded minute delta modulation disconnect(ed) mode Defense Mapping Agency direct memory access distance measuring equipment Defense Message System Defense Nuclear Agency dynamic nonhierarchical routing destination network identification data network identification code data numbering plan area Domain Name System design objective Department of Commerce dynamic overload control Department of Defense direct outward dialing Department of Defense Directive Department of Defense Index of Specifications and Standards

DOD-STD DOJ DOS DOT DOV DP DPCM DPSK DQDB DQPSK DR DRAM DRS DRSI DS DS0 DS1 DS1C DS2 DS3 DS4 DSA DSAM DSB DSB-RC DSB-SC DSC DSCS DSDC DSE DSI DSL

Department of Defense Standard Department of Justice Department of State Department of Transportation data over voice demarcation point dial pulse differential pulse-code modulation differential phase-shift keying distributed-queue dual-bus [network] differential quadrature phase-shift keying data receive dynamic random access memory delayed release signal destination station routing indicator data speed digital signal direct support digital signal 0 digital signal 1 digital signal 1C digital signal 2 digital signal 3 digital signal 4 dial service assistance double-sided amplitude modulation double-sideband [transmission] Defense Science Board double-sideband reduced carrier transmission double-sideband suppressed-carrier transmission digital selective calling Defense Satellite Communications System direct services dialing capability data switching exchange digital speech interpolation digital subscriber line

DSN DSn DSP DSR DSS DSSCS DS-SMF DSSR DSSS DSTE DSU DSX-n DTE DTG DTMF DTN DTO DTRS DTS DTU DU DUP DUV DVL DWDM DXE DX signaling E E911 EA

Defense Switched Network digital signal, level n digital signal processing data signaling rate data station selector direct station selection Defense Special Service Communications System dispersion-shifted single-mode fiber digital short range radio direct sequence spread spectrum data subscriber terminal equipment data service unit digital signal cross connect, level n data terminal equipment digital terminating equipment date time group dual-tone multifrequency [signaling] data transmission network dial tone office digital trunked radio system Diplomatic Telecommunications Service data transfer unit digital transmission unit digroup terminal unit direct to user data unit data user part data under voice direct voice link dense-wavelength division multiplexing [See DCE] data circuit-terminating equipment [See DCE] data circuit terminal equipment direct current signaling duplex signaling exa (1018) enhanced 911 (emergency service) equal access

EAS EBCDIC Eb/N0 EBO EBS EBX EC ECA ECC ECCKT ECCM ECM ECO ECPT ECSA ECT ED EDA EDC EDI EDP EDTV EE EEI EF EHF EIA eirp

expedited data acknowledgment message extended address field bit extended area service extended binary coded decimal interchange code signal energy per bit per hertz of thermal noise embedded base organization Emergency Broadcast System electronic branch exchange Earth coverage Earth curvature exchange carrier emergency changeover acknowledgement signal electronically controlled coupling enhance call completion exchange company cirtuit ID electronic counter-countermeasures electronic countermeasures emergency changeover message emergency changeover order signal electronic coin public telephone Exchange Carrier Standards Association [now ATIS] exchange carrier tandem expedited data electronic directory assistance error detection and correction electronic data interchange electronic data processing extended-definition television equipment engineering electrical engineering equipment-to-equipment interface extended frame errored frame extremely high frequency Electronic Industries Association effective isotropically radiated power equivalent isotropically radiated power

800DB EIS EIT el ELECTROOPTINT ELF ELINT ELSEC ELT e-mail, E-mail, email EMC EMCON EMD EME emf EMI EMI/EMC EML EMP EMR EMR hazards e.m.r.p. EMS EMSEC emu EMV EMW ENQ EO E.O. EOA&M

800 Data Base Emergency Information System encoded information type elevation electro-optical intelligence extremely low frequency electronics intelligence electromagnetic intelligence electronics security emergency locator transmitter electronic mail electromagnetic compatibility emission control equilibrium mode distribution electromagnetic environment electromotive force electromagnetic interference electromagnetic interference control electromagnetic interference and compatibility expected measurement loss electromagnetic pulse electromagnetic radiation electromagnetic radiation hazards effective monopole radiated power equivalent monopole radiated power electronic message system emanations security electromagnetic unit electromagnetic vulnerability electromagnetic warfare electromagnetic wave enquiry character end office Executive Order engineering, operations, administration, and maintenance

EOC EOD EOF EOL EOM EOP EOS EOT EOW EPL EPROM EPSCS ERL ER link ERP, e.r.p. ERR ES ESC ESF ESM ESMR ESP ESS ET ETB ETGC ETS ETSI ETX EU EW

embedded operations channel end of data end of file end of line end of message end of program end output end-of-selection character end-of-transmission character end of tape engineering orderwire electronic switching system programming language erasable programmable read-only memory enhanced private switched communications system echo return loss emergency response link effective radiated power protocol data unit error end system errored second expert system escape character enhanced satellite capability extended superframe electronic warfare support measures enhanced specialized mobile radio enhanced service provider electronic switching system exchange termination end-of-transmission-block character Exchange Telephone Group Committee electronic tandem switching electronic translator system European Telecommunications Standards Institute end-of-text character end user electronic warfare

EXCSA f f F FAA FACS FADU FAQ file FAX FC FCAP FCC FCM FCS FDDI FDDI-2 FDHM FDM FDMA FDT FDX FEBE FEC FECC FED-STD FEMA FEP FEPS FET FERF FIB FIC FID

Exchange Carriers Standards Association facility accepted message femto (10-15) frequency farads (capacitance) Federal Aviation Administration facilities assignment and control system file access data unit Frequently Asked Questions file facsimile functional component facility code facility capability facility capacity Federal Communications Commission flow control message(s) frame check sequence fiber distributed data interface fiber distributed data interface-2 full duration at half maximum frequency-division multiplex(ing) frequency-division multiple access frame due time full duplex far end block error forward error correction Federal Emergency Communications Coordinators Federal Standard Federal Emergency Management Agency front-end processor facility and equipment planning system field effect transistor far-end receive failure forward indicator bit facility interface code field identifier

FIFO FIP FIPS FIR FIRMR FISINT FISU 5ESS flops FLMPTS FLTSATCOM FM FO FOC FOCC FOT FPDU FPGA FPIS ft/min fps FPS FRJ FRP FSDPSK FSDU FSK FSN FSNR FSNX

first-in, first-out facility interface processor Federal Information Processing Federal Information Processing Standards finite impulse response Federal Information Resources Management Regulations foreign instrumentation signals intelligence fill-in signal unit #5 Electronic Switching System floating-point operations per second style="mso-spacerun: yes"> Future Public Land Mobile Telecommunication Systems Fleet Satellite Communications frequency modulation fiber optics final operational capability full operational capability fiber optics communications Fiber Optics Coordinating Committee forward-transfer message frequency of optimum traffic frequency of optimum transmission frame relaying protocol data unit field programmable gate array forward propagation ionospheric scatter feet per minute foot-pound-second frames per second focus projection and scanning facility reject message Federal Response Plan filtered symmetric differential phase-shift keying frame relaying service data unit frequency-shift keying forward sequence number forward sequence number received forward sequence number expected

FSS FT FTAM FTF FTR ft/s FTS FTS2000 FTSC FTSP FTP FWHM FX FX OPER g G GAN GAS GBH GCT GDF GEO GETS GFE GGCL GHz GII GMT GND GOS GOSIP GOTS

Fixed Satellite Service fully separate subsidiary fiber optic T-carrier file transfer, access, and management Federal Telecommunications Fund Federal Telecommunications Recommendation feet per second Federal Telecommunications System Federal Telecommunications Service Federal Telecommunications System 2000 Federal Telecommunications Standards Committee Federal Telecommunication Standards Program file transfer protocol full width at half maximum fixed service foreign exchange foreign exchange service foreign exchange trunk operation profile parameter giga (109) global area network special autonomous group group busy hour Greenwich Civil Time group distribution frame Geostationary Earth orbit Geosynchronous Earth orbit Government Emergency Telecommunications Service Government-furnished equipment government-to-government communications link gigahertz Global Information Infrastructure Greenwich Mean Time ground grade of service Government Open Systems Interconnection Profile government (-developed) off-the-shelf

GRP MOD GRS GSA GSM GSTN G/T GTP GTS GUI h HALO HAPS HBA HBUR HBUS HCS HCSDS HCTDS HDLC HDTV HDX HE11mode HEMP HEO HERF HERO HERP HF HFDF HGA HGB HGU HIPERLAN

group modulation reset circuit group message General Services Administration global system for mobile communications general switched telephone network antenna gain-to-noise-temperature Government Telecommunications Program Government Telecommunications System graphical user interface hecto (102) Henry (inductance) Planck's constant high-altitude, long operation high-altitude platform station hardware group blocking acknowledgment signal hardware blocking/unblocking reception hardware blocking/unblocking sending hard clad silica [fiber] high-capacity satellite digital service high-capacity terrestrial digital service high-level data link control high-definition television half-duplex [operation] the fundamental hybrid mode [of an optical fiber] high-altitude electromagnetic pulse highly elliptical Earth orbit hazards of electromagnetic radiation to fuel hazards of electromagnetic radiation to ordnance hazards of electromagnetic radiation to personnel high frequency human factors high-frequency distribution frame hardware carrier group alarm hardware group blocking signal hardware group unblocking signal high-performance radio local area network

HLL HML HPC HPF HSD HSSDS HU HV Hz I IA IAC IAM IAPP I&C IBOC IC ICAN ICC ICCF ICI ICIC ICN ICNI ICSC ICT ICW ID IDDD IDF IDL

high-level language hunting multiline group number high probability of completion hunting preferential list high-speed data high-speed switched digital service high usage high voltage hertz current (amperes) information International Alphabet [CCITT] initial alignment control initial address message inter-access point protocol installation and checkout in band, on-channel integrated circuit interexchange carrier (also “IXC”) individual circuit analysis incoming trunk circuit, Interstate Commerce Commission Industry Carriers Compatibility Forum incoming call identification Interexchange Carrier Industry Committee international closed user group number integrated communications, navigation, and identification Interexchange Customer Service Center interexchange carrier tandem interrupted continuous wave identification identifier identity International Direct Distance Dialing intermediate distribution frame intermediate distributing frame interface definition language

IDN IDTV IEC IEEE IES IF I/F IF1…IF6 IFF IFIP IFRB IFRPS IFS IFx IILC IIR IITF ILD ILS IM IMA I&M IMD IMP IN IN/1, IN/1+, IN/2 INC INF INFOSEC INR INS INTELSAT

integrated digital network improved-definition television International Electrotechnical Commission Institute of Electrical and Electronics Engineers Industry Executive Subcommittee intermediate frequency interface interface 1…interface 6 identification, friend or foe International Federation for Information Processing International Frequency Registration Board (now Radio Regulations Board ) Intercity Facility Relief Planning System ionospheric forward scatter interface configuration x Information Industry Liaison Committee infinite impulse response Information Infrastructure Task Force injection laser diode instrument landing system intensity modulation intermodulation interface module individual mobilization augmentee installation and maintenance intermodulation distortion interface message processor intelligent network intelligent network concepts [versions 1, 1+, 2] Industry Numbering Committee international exchange carrier international carrier information message information systems security information request message inertial navigation system International Telecommunications Satellite Consortium

INWATS I/O IOC IOP IP IPA IPC IPM IPMS IPN IPRC IPTF in/s ips IPX IQF IR IRAC IRC IS ISB ISDN ISL ISM ISO ISP ISSI ISUP IT

Inward Wide-Area Telephone Service input/output [device] integrated optical circuit input-output controller input/output processor Internet protocol intelligent peripheral interpersonal intermediate power amplifier information processing center impulses per minute interference prediction model interpersonal message interruptions per minute interpersonal messaging system interpersonal notification Intellectual Property Rights Committee Infrastructure Protection Task Force inches per second interruptions per second Internet Packet Exchange intrinsic quality factor infrared Interdepartment Radio Advisory Committee international record carrier Interagency Radio Committee international standard interim standard independent-sideband [transmission] Integrated Services Digital Network intersatellite link industrial, scientific, and medical (applications) International Organization for Standardization Internet service provider inter-RF subsystem interface Integrated Services Digital Network user part integrated services user part integrated test

ITA ITA-5 ITC ITM ITS ITSO ITU I2 IVDT IXC JANAP JCS JMX jpeg JS JSC JTC JTC3A JTIDS JTRB JTRS JTSCC JTSSG k K kb (or “Kbit”) kb/s, or kbps KDC

inactivity test information technology International Telegraph Alphabet International Telegraph Alphabet Number 5 International Teletraffic Congress independent telephone company installation, testing, and maintenance intelligent transportation system Institute for Telecommunication Sciences International Telecommunications Satellite Organization International Telecommunication Union Next Generation Internet (also abbreviated “NGI”) integrated voice data terminal interexchange carrier Joint Army-Navy-Air Force Publication(s) Joint Chiefs of Staff jumbo group multiplex Joint Photographic Experts Group (file format) jack status Joint Steering Committee [now JTSSG] Joint Spectrum Center Joint Technical Committee Joint Tactical Command, Control and Communications Agency Joint Tactical Information Distribution System Joint Telecommunications Resources Board Joint Tactical Radio System Joint Telecommunications Standards Coordinating Committee Joint Telecommunications Standards Steering Group [formerly JSC] kilo (103) Boltzmann's constant coefficient of absorption kelvin 1000 bits (kilobit) kilobits per second key distribution center

KDR KDT kg kg•m•s kHz km k ,k KP KSR kT KTS KTU CO

L1 L2 L3 L4 LAC LADT LAMA LAN LAP-B LAP-D laser LASINT LATA LBO LBS LC LCD LCIE LCN

keyboard data recorder keyboard display terminal kilogram kilogram-meter-second kilohertz (1000 Hz) kilometer kilohm keypulse keyboard send/receive device noise power density key telephone system key telephone unit wavelength cutoff wavelength level 1, Layer 1 (physical/electrical interface) level 2, Layer 2 (signaling link functions) level 3, Layer 3 (signaling network functions) level 4 (ISDN user part) loop assignment center local area data transport local automatic message accounting local area network Data Link Layer protocol [CCITT Recommendation X.25 (1989)] local access protocol, balanced link access procedure D link access protocol – D channel light amplification by stimulated emission of radiation laser intelligence local access and transport area line buildout load balance system limited capability liquid crystal display lightguide cable interconnection equipment local communication network

LD LDM LEC LED LEGACT LEO LERG LF LFB LIDB LIFO LLC LLN LLSC l/m LMCS LMDS LMF LMMS LMR LNA LOCAP LOF loran LOS LP LPA LPC LPD LPI lpi

long distance limited distance modem local exchange carrier local exchange companies light-emitting diode leg activity low Earth orbit local exchange routing guide low frequency line finder look-ahead-for-busy [information] line information data base last-in, first-out logical link control [sublayer] line link network link set control lines per minute local multipoint communications system local multipoint distribution system language media format local message metering system land mobile radio launch numerical aperture low capacitance lowest operating frequency long-range aid to navigation system long-range radio aid to navigation system line of sight loss of signal linearly polarized [mode] log-periodic [array] linear power amplifier, loop-back acknowledgment message linear predictive coding low probability of detection low probability of interception lines per inch

lpm LP01 LQA LRAP LRC LRS LS LSAC LSB LSC LSDA LSI LSLA LSLD LSLR LSO LSS LSSU LSTA LT LTC LTE LTF LUA LUN LUF LULT LUNT LV m M mA

lines per minute the fundamental mode (of an optical fiber) link quality analysis long route analysis program longitudinal redundancy check line repeater station line side signaling link activity control lower sideband, least significant bit link state control signaling data link allocation large scale integrated [circuit] line status indication signaling link activation signaling link deactivation signaling link restoration local serving office local switching system link status signal unit signaling terminal allocation the physical termination of the DSL at the network end line traffic coordinator line terminating equipment lightwave terminating frame link uninhibit acknowledgment link uninhibit message lowest usable high frequency line-unit-line termination line-unit-network termination low voltage meter milli (10-3) mega (106) maintenance modifier function bit milliampere

MAC MACOM MAN MAP MAS maser M[ ] MAU MB Mb/s also Mbps MCC MCDN MCEB MCM MCS MCW MCXO MD MDF MDS MDT MECAB MEECN MEO MERCAST MESSPROC MET MF MFD MFJ MFSK

medium access control [sublayer] major command metropolitan area network manufacturers' automation protocol mass announcement system microwave amplification by the stimulated emission of radiation material dispersion coefficient medium access unit message blocking megabits per second maintenance control circuit master control center microcellular data network Military Communications-Electronics Board multicarrier modulation Master Control System modulated continuous wave microcomputer compensated crystal oscillator management domain mediation device main distribution frame message distribution system, multipoint distribution system mean downtime multiple exchange carrier access billing Minimum Essential Emergency Communications Network medium Earth orbit merchant-ship broadcast system message processing multibutton electronic telephone medium frequency multifrequency [signaling] mediation function mode field diameter Modification of Final Judgment multiple frequency-shift keying

MFT MGB MGT MGU MHF

metallic facility terminal maintenance group blocking signal mastergroup translator maintenance group unblocking signal medium high frequency message handling service MHS message handling system MHz megahertz mi mile MI machine interface machine interface code MIC medium interface connector mutual interface chart MII mobile information infrastructure MILNET military network MIL-STD Military Standard min minute MIP medium interface point MIPS, mips million instructions per second MIS management information system MKS meter-kilogram-second MLPP multilevel precedence and preemption MLH multiline hunt MLM multilongitudinal mode MLPP multilevel precedence and preemption MLT mechanical loop testing MMDS multichannel multipoint distribution system MMGT multimastergroup translator modular, multifunctional information transfer system(s) [See MMITS SDR Forum] MMUC minimum monthly usage charge MMW millimeter wave MMX mastergroup multiplex MN mobile node modem modulator-demodulator modified AMI code modified alternate mark inversion code

mol MOTIS MOU mpeg MPN ms MS MSA MSB MSC MSK MSS MSTM MSU MTA MTBF MTBM MTBO MTBPM MTF MTIE MTP MTS MTSE MTSO MTSR MTTR s MUA MUF

mole message-oriented text interchange system minutes of use Motion Picture Experts Group mode-partition noise millisecond (10-3second) message store mobile station metropolitan statistical area most significant bit media stimulated calling mobile switching center mobile services switching center minimum-shift keying Mobile Satellite Service mobile satellite system maximum skew one-tenth maximum message signal unit message transfer agent mean time between failures mean time between maintenance mean time between outages mean time between preventive maintenance modulation transfer function maximum time interval error message transfer part message telecommunications service message transfer system message transfer service element mobile telephone switching office mobile telecommunications switching office mean time to service restoral mean time to repair micro (10-6) microsecond maintenance group unblocking acknowledgment signal maximum usable frequency

muldem MUX MUXing mv mw mW MWI MWV n N. N0 NA NAC NACSEM NACSIM NAK (also “NACK)” NANA NANP NANPA NASA NASNA NASP NATA NA-TDMA NATO NAVSTAR-GPS NBEC NBFM NBH NBRVF NBS

multiplexer/demultiplexer multiplex multiplexer multiplexing millivolt microwave milliwatt message waiting indicator maximum working voltage nano (10-9) refractive index numeric characters, 0-9 sea level refractivity spectral noise density numerical aperture network aspects network administration center National Communications Security Emanation Memorandum National Communications Security Information Memorandum negative-acknowledge character North American Numbering Administration North American Numbering Plan North American Numbering Plan Administration National Aeronautics and Space Administration National Association of State 9-1-1 Administrators network application service part North American Telecommunications Association North American ― Time Division Multiple Access North Atlantic Treaty Organization Navigational Satellite Timing and Ranging ─ Global Positioning System non-Bell exchange company narrowband frequency modulation network busy hour narrowband radio voice frequency National Bureau of Standards [now NIST]

NBSV NC NCC NCI NCP NCS NCSC NCTE NDCC NDCS NDER NDIS NEACP NEC NECA NEF NEP NES NETS NF NFS NGI NGSO NHN NI NIC NICS NID NII NIOD

narrowband secure voice network channel network connection no current National Coordinating Center for Telecommunications network channel interface (code) network control point network control processor National Communications System net control station National Communications Security Committee network channel terminating equipment network data collection center network data control system National Defense Executive Reserve network driver interface specification National Emergency Airborne Command Post National Electric Code ® National Exchange Carrier Association network element function noise equivalent power noise equivalent signal Nationwide Emergency Telecommunications Service noise figure Network File System Next Generation Internet [also abbreviated I2] non-Geostationary orbit nonhunting number network interface number identification network interface card NATO Integrated Communications System network interface device network information database National Information Infrastructure network inward/outward dialing

NIST NIU NLP nm NMC nmi NNI NOC NOCS NOD NOF NORGEN NOTIS NOW Np NP NPA NPCI NPN NPNB NPR N(r) NRI NRM NRRC NRZ NRZI NRZ-M NRZ-S NRZ1 NRZ-1 ns N(s) NSA NSC

National Institute of Standards and Technology [formerly NBS] network interface unit National Level Program nanometer network management center nautical mile network node interface network operations center network operations center system network outward dialing Network Operations Forum network operations report generator network operations trouble information system number of WATS neper network pause numbering plan area network protocol control information network provided number no primary / no backup noise power ratio receive sequence number net radio interface network resource manager Nuclear Risk Reduction Center non-return-to-zero non-return-to-zero inverted non-return-to-zero mark non-return-to-zero space non-return-to-zero, change on ones non-return-to-zero mark nanosecond send sequence number National Security Agency National Security Council

network service center NS/EP National Security / Emergency Preparedness telecommunications telecommunications NSP national signaling point NSPMP network switching performance measurement plan NSTAC National Security Telecommunications Advisory Committee NTCN National Telecommunications Coordinating Network NTMS National Telecommunications Management Structure network termination NT physical termination of the DSL at the user end NT1 network termination 1 NT2 network termination 2 NTI network terminating interface NTIA National Telecommunications and Information Administration NTN network terminal number National Television Standards Committee NTSC National Television Standards Committee [standard] NUL null character NVIS near-vertical-incidence skywave NXX 3-digit code identifying a central office exchange O operations ohm OAM OAMP O&M OC OC-1 OC-N OCC OCE OCIS OCM OCR OCS

operations, administration and maintenance operations, administration, maintenance, and provisioning operations and maintenance operating company operations center optical carrier optical carrier Level 1 optical carrier Level N other common carrier other common carrier channel equipment online customer information system office carrier module optical character reader optical character recognition originating call screening

OCU OCVCXO OCXO OD OEC OFC OFCP OFCR OFDM OFN OFNP OFNR OGC OI OMAP OMB OMEG ONA ONI OPC OPDU opm OPMODEL OPS OPSEC OPX O/R OR ORL OS OSC

office channel unit orderwire control unit oven controlled-voltage controlled crystal oscillator oven controlled crystal oscillator optical density outpulsed digits outside diameter other exchange company other exchange coordinator optical fiber, conductive optical fiber, conductive, plenum optical fiber, conductive, riser orthogonal frequency division multiplexing optical fiber, nonconductive optical fiber, nonconductive, plenum optical fiber, nonconductive, riser outgoing trunk circuit optical interface operations, management, and administration part Office of Management and Budget Operations and Maintenance Experts Group open network architecture operator umber identification originating point code operation protocol data unit operations per minute operations model off-premises station operator services operations security off-premises extension originator/recipient off-route service off-route aeronautical mobile service optical return loss operations system oscillator

OSF OSHA OSI OSI-RM OSP OSRI OSS OSSN OTAM OTAR OTC OTDR OUTWATS OW p P PABX PACA-E PACS PAD PAL PAL-M PAM PAMA p/a r PAR PARAMP par meter PAX PBER PBX

operations system function Occupational Safety and Health Administration open switch interval open switching interval Open Systems Interconnection Open Systems Interconnection―Reference Model operator service provider originating stations routing indicator operator service system operations support system originating stations serial number over-the-air management of automated HF network nodes over-the-air rekeying operating telephone company optical time domain reflectometer optical time domain reflectometry Outward Wide Area Telecommunications Service orderwire [circuit] pico (10-12) peta (1015) provisioning private automatic branch exchange enhanced priority access and channel assignment personal access communications system packet assembler/disassembler phase alternation by line phase alternation by line―modified pulse-amplitude modulation pass along message pulse-address multiple access peak-to-average ratio performance analysis and review parametric amplifier peak-to-average ratio meter private automatic exchange pseudo-bit-error-ratio private branch exchange

PC PCAC PCB PCI PCM PCMCIA PCME PCN PCO PCPC PCR PCS PCSR PD PDC PDM PDN PDS PDT PDU PE PEP pF PF PFM PHS

carrier power (of a radio transmitter) personal computer point code point code allowed control power circuit breaker printed circuit board protocol control information personal communications interface pulse-code modulation process control module Personal Computer Memory Card Industry Association packetized circuit multiplication equipment Personal Communications Network peg count and overflow point code prohibited control preventive cyclic retransmission Personal Communications Services plastic-clad silica [fiber] parallel channels signaling rate photodetector protocol discriminator personal digital cellular pulse delta modulation pulse-duration modulation public data network protected distribution system program data source programmable data terminal protocol data unit emergency proving period peripheral equipment phase-encoded [recording] peak envelope power (of a radio transmitter) picofarad power factor pulse-frequency modulation personal handy phone system

PI PIC PIN ping PIV PLA PLL PLN PL/I PLR PLS pm PM PMB PMO PNNI POC POI POP POSIX POT POTS PP P-P P/P PPDU PPM pps PR PREMIS PRF

protection interval plastic insulated cable presubscribed interexchange carrier personal identification number(s) packet Internet groper peak inverse voltage programmable logic array phase-locked loop private line network programming language 1 pulse link repeater physical signaling sublayer phase modulation mean power preventive maintenance protocol machine pulse modulation pilot-make-busy [circuit] program management office private network-to-network interface (signaling) point of contact processor outage control point of interface point of presence Portable Operating System Interface for Computer Environments point of termination plain old telephone service polarization-preserving [optical fiber] peak-to-peak [value] point-to-point presentation protocol data unit pulse-position modulation pulses per second pulse rate premises information system pulse-repetition frequency

PRESUB PRI PRILOC PRM PRMD PROM PROVINT PRR PRSL PS PSAP PSDN PSDS psi PSK PSN PSPDN p-static PSTN PSWAC PSWN PTE PTF PTM PTT PTTC PTTI PU PUC PV PVC pW

presubscription primary rate interface primary location pulse-rate modulation private management domain programmable read-only memory provisioning interval pulse repetition rate primary area switch locator permanent signal public service answering point presentation service access point public switched digital network public switch digital services pounds [force] per square inch phase-shift keying public switched network public switched packet data network precipitation static public switched telephone network Public Safety Wireless Advisory Committee public safety wireless network path terminating equipment patch and test facility pulse-time modulation postal, telephone, and telegraph push-to-talk [operation] paper tape transmission code precise time and time interval power unit public utility commission public utilities commission parameter value permanent virtual circuit polyvinyl chloride [insulation] picowatt

PWM pWp pWp0 PWT pX PX pY PY pZ PZ Q QA QAM QC QCIF QMR QOS QPSK QRC QRS QRY QSS QTY QSTAG R

R1 racon rad radar RADHAZ RADINT

pulse-width modulation [deprecated] picowatt, psophometrically weighted picowatts, relative to a 0TLP Personal Wireless Telecommunications peak envelope power (in dB) peak envelope power peak envelope power (in watts) mean power [in dB] mean power [in watts] carrier power [in dB] carrier power [in watts] speech-to-speech-correlated-noise ratio quality assurance quadrature amplitude modulation quality control quarter common intermediate format qualitative material requirement quality of service quadrature phase-shift keying quick reaction capability quasi-random signal query quality surveillance system quantity Quadripartite Standardization Agreement resistance (ohms) ring ring conductor route service ring ring conductor radar beacon radian radiation absorbed dose radio detection and ranging electromagnetic radiation hazards radar intelligence

RAM R&D RATT RBOC RbXO RC RCC RCM RCVR RDES RDS RDT RDF RE REA REC REJ REL REM REN RES RGB rf RFI RFP RFQ RH RHR RI

random access memory reliability, availability, and maintainability research and development radio teletypewriter system Regional Bell Operating Company rubidium-crystal oscillator reception control reflection coefficient resource controller retransmission counter radio common carrier reject connect modify message remote carrier module receiver remote data entry system radio digital system radio digital terminal radio direction-finding return error remote entry Rural Electrification Administration receiver reject release message remote equipment module ringer equivalency number radio equipment and systems resume message red-green-blue radio frequency range finder radio frequency interference request for proposal request for quotation relative humidity radio horizon range routing indicator

RID RISC RJ RJE RL RLC RLMS RLSD rms RNR RO ROA ROH ROC ROM ROSE RP RPI RPLY rpm RPM rps RPT RQ RR RSA RSC RSCM RSM RSL

response ID reduced instruction set chip registered jack reference number reject remote job entry restoral limit release complete message return loss measuring set released message root-mean-square [deviation] receive not ready read only receive only reorder recognized operating agency receiver off-hook required operational capability read-only memory remote operations service element protocol restoration priority radio port intermediary reply revolutions per minute rate per minute revolutions per second radio personal terminal repeat-request receive ready repetition rate return result rural service area reset-circuit message reset confirmation message remote switching module signaling-route-set-test message received signal level

RSRM RSRT RSS rss RST RT R/T RTA RTA RTB RTC RTCC RTM RTPC RTR RTRC RTS RTTY RTU RTX RVA RVWG RWI RX RZ s S SABME SAC SAL SAM SAP SAPI SAR SARTS

reset request message signaling route set test control remote switching system root-sum-square reset circuit radio termination real time remote trunk arrangement transfer allowed control retransmission buffer restart confirmation transfer-controlled control remote test module transfer prohibited control restart request transfer-restricted control request to send radio teletypewriter remote terminal unit request to transmit reactive volt-ampere Reliability and Vulnerability Working Group radio and wire integration receive receiver return-to-zero [code] second supervisory function bit set asynchronous balanced mode extended service access code service affecting limit subsequent-address message service access point service access point identifier special access request switched access remote test system

SAS SASE SBR SBRC SBUR SBUS SC SCC SCCP SCCS SCE SCEG SCF SCP SCPC SCR SCRT SCSR SCU SDL SDLC SDM SDN SDO SDR SDR Forum SDU SECAM SECDEF SECLC SECLOC SECORD

switched access services specific application service elements subsystem backup routing subsystem backup routing control software blocking/unblocking reception software blocking/unblocking sending service code standard coding specialized common carrier switched control center signaling connection control part switched control center system service creation environment experts group on speech coding service control facility service control point single channel per carrier semiconductor-controlled rectifier silicon-controlled rectifier service class routing single channel signaling rate selector control unit Specification and Description Language synchronous data link control space-division multiplexing [deprecated] software-defined network standards development organization software-defined radio Software Defined Radio Forum [formerly MMITS] service data unit systeme electronique couleur avec memoire sequential couleur avec memoire Secretary of Defense secondary location secondary location secure voice cord board

SECTEL SECTLV SEG SEL SES SETAMS SEVAS S-F SF SG SGDF S/H SHA SHARES SHF SI SIB SID SIE SIF SIGINT SIM SINAD SIO SIT S( ) SLC SLD SLI SLM

secure telephone secondary transmission level point experts group on security selector satellite earth station(s) severely errored second(s) systems engineering, technical assistance, and management services Secure Voice Access System store-and-forward single-frequency [signaling] status field study group supergroup distribution frame sample and hold sidereal hour angle Shared Resources (SHARES) HF Radio Program super high frequency International System of Units service indicator status indicator status indication “B” (“busy”) sudden ionospheric disturbance status indication “E” (“Emergency Alignment”) signaling information field signal information field signals intelligence subscriber identity module signal-plus-noise-plus-distortion to noise-plus-distortion ratio service information octet special information tone chromatic dispersion slope signaling link code superluminescent diode [see superluminescent LED ] service logic interpreter signaling link management

SLP SLS SLTA SLTC SLTM SMAS SMDF SMDR SMF SMH SMR SMS SMSA SMTP SNA SNI SNMP SNR SOH SOM sonar SONET SOP SOR SOW SP SPC SPCS SPDU SPE SPNB

single longitudinal mode service logic program signaling link selection code signaling link test message acknowledgment signaling link test control signaling link test message switched maintenance access system subscriber main distribution frame subscriber main distributing frame station message-detail recording single-mode fiber signaling message handling specialized mobile radio service management system standard metropolitan statistical area simple mail transport protocol shared network arrangement signaling network interworking simple network management protocol signal-to-noise ratio subsystem-normal-routing (message) start-of-heading character start of message sound navigation and ranging synchronous optical network standard operating procedure start of record subsystem-out-of-service-request message statement of work signal processor signaling point stored-program control signaling point code stored-program control system session protocol data unit synchronous payload envelope some-primary / no backup

SPOT SPRC SPS SPSB (S+N)/N sr SR S/R SRC SRM SRO SRT SRTC SSB SSBAM SSB-SC SSD SSF SSN

SSP SSPC SSR SS7 SST SSTC SSUPS ST STALO STANAG STD

secondary location point of termination signaling point of termination signaling process control signaling protocol and switching some-primary / some backup signal-plus-noise-to-noise ratio steradian service request send and receive service request confirmation signaling route management standards related organization subsystem routing status test message subsystem-routing status test control single-sideband [transmission] single-sideband amplitude modulation single-sideband suppressed carrier [transmission] second start dial subservice field station serial number subsystem number service switching point service signaling point signal service point subsystem-prohibited message subsystem-prohibited control side-mode suppression ratio Signaling System No. 7 subsystem-status-test message service transfer point subsystem status test control solid-state uninterruptible power system end-of-pulsing signal start signal stabilized local oscillator Standardization Agreement [NATO] subscriber trunk dialing

STFS STL STM STP STS STS-1 STS-n STS POH STS PTE STU STX SU SUB SUPERNET SUS SVC SWR SX SXS SYN SYNTRAN SYSGEN T

T1 T1AG T1A1 T1E1

state transition diagram standard time and frequency signal [service] standard time and frequency service standard telegraph level studio-to-transmitter link signaling traffic management standard temperature and pressure signal transfer part signal transfer point synchronous transport signal synchronous transport signal level 1 synchronous transport signal level n synchronous transport signal path overhead synchronous transport signal path terminating equipment secure telephone unit start-of-text character signaling unit signal unit substitute character Sjared Im;ocemsed {erspma; Radop Metwprl suspend message switched virtual circuit standing wave ratio simplex signaling step-by-step switching system step-by-step system synchronous idle character synchronous transmission system generation tera (1012) tip tip conductor 1st ANSI Telecommunications Standards Committee tip tip conductor T1 Advisory Group T1 committee on Performance and Signal Processing T1 committee on Interfaces, Power and Protection for

T1EDH T1M1 T1P1 T1S1 T1X1 TADIL TADIL-A TADIL-B TADS TADSS TAI TASC TASI TAT TB TC TCAP TCAS TCB TCBC TCC TCCF TCF TCIC TCIF TCL TCLw TCM TCOC TCP TCPAP

Networks T1 committee on Electronic Data Handling Internetwork Operations, Administration, Maintenance, and Provisioning (IOAM&P) T1 committee on Wireless/Mobile Services and Systems T1 committee on Services, Architectures, and Signaling T1 committee on Digital Hierarchy and Synchronization tactical data information link tactical data information link-A tactical data information link-B teletypewriter automatic dispatch system Tactical Automatic Digital Switching System International Atomic Time telecommunications alarm surveillance and control (system) time-assignment speech interpolation trans-Atlantic telecommunication (cable) transmission buffer toll center technical committee transport connection transaction capability control part (of SS7) transaction capabilities application part T-carrier administration system trusted computing base changeback control telecommunications center Tactical Communications Control Facility technical control facility transfer controlled trunk circuit identification code Telecommunication Industry Forum terminal coupling loss weighted terminal coupling loss time-compression multiplexing changeover control transmission control protocol transaction capabilities control part

TCPIP TCRC TCS TCSP TCU TCVXO TCXO TD TDAS TDD TDEA TDM TDMA TDR TE TED TEI TEK TEM TEMPEST TEMS TERM TFA TFC TFLAP TFMI TFP TFPC TFR TFRC TFS TFTS

Transmission Control Protocol/Internet Protocol controlled rerouting control trusted computer system tandem cross section program teletypewriter control unit temperature compensated-voltage controlled crystal oscillator temperature controlled crystal oscillator time delay transmitter distributor traffic data administration program telecommunications device for the deaf time division duplex Triple Data Encryption Algorithm time-division multiplexing time-division multiple access time division multiplex traffic distribution request transverse electric [mode] terminal equipment trunk encryption device terminal endpoint identifier traffic encryption key transverse electric and magnetic [mode] compromising emanations telecommunications management system terminal transfer-allowed signal transfer-controlled signal T-carrier fault-locating applications program traffic mix information transfer-prohibited signal Toll Fraud Prevention Committee transfer-restricted (signal) forced rerouting control trunk forecasting system Terrestrial Flight Telephone System

TGID TGM TGSN THD THF THz TIA TIE TIFF TIP TK TL TLAC TLN TLP TL/PVC TL/SVC TLV TM TMD TMDF TMN TMS TNDS TNOP TP TPDU TPT TQ TQTF TRA TRANSEC

trunk group identification trunk group multiplexer trunk group serial number total harmonic distortion tremendously high frequency terahertz Telecommunications Industry Association time interval error tag image file format terminal interface processor response timer Transport Layer transmission level link availability control trunk link network transmission level point Transport Layer / permanent virtual circuit Transport Layer / switched virtual circuit transmission level transverse magnetic [mode] transmission and multiplexing trunk main distributing trunk main distributing frame telecommunications management network time-multiplexed switch total network data system total network operations plan test pad test pattern toll point transport protocol data unit test progress tone transmission quality Transmission Quality Task Force traffic routing and administration transmission security

TRC TRCC TRD TRF TRFTYP TRI TRI-TAC TRM TRM TYP TRMTR also Xmtr TS TSB TSC TSFC TSI TSK TSP TSPS TSR TSRC TSS TTC TTL TTTN TTY TTY/TDD TUP TV TW TWT TWTA TWX®

transverse redundancy check signaling link congestion control timed release disconnect tuned radio frequency traffic type traffic routing information tri-services tactical [equipment] termination termination type transmitter trunk side Telecommunication Standardization Bureau technical subcommittee signaling traffic flow control time-slot interchange transmission security key Telecommunications Service Priority [system] traffic service position traffic service position system telecommunications service request terminate and stay resident trunk service record testing services request signaling routing control trunk servicing system Telecommunication Technology Committee (Japanese) transistor-transistor logic tandem tie trunk network teletypewriter telecommunications device for the deaf telephone user part television traveling wave traveling wave tube traveling wave tube amplifier teletypewriter exchange service

TX TXC U UA UAV UBA UBL UCC UCD UDP UHF UI UIM UIS UITS ULF U/L UNI UP UPN UPS UPT UPTAN URL USB USBS USDA USFJ USFK USNO USOC USR

transmit transmitter transmission control unnumbered unnumbered acknowledgment user agent unmanned air vehible unblocking-acknowledgment message unblocking message universal commercial code uniform call distribution User Datagram Protocol ultra high frequency unit interval unnumbered information user identity module user-in-service unacknowledged information transfer service ultra low frequency uplink unidirectional user-network interface user part user provided number uninterruptible power supply Universal Personal Telecommunications [service] Universal Personal Telecommunications access number universal routing locator upper sideband universal serial bus user signaling bearer service U.S. Department of Agriculture U.S. Forces, Japan U.S. Forces, Korea U.S. Naval observatory universal service order code user-to-user information message

USTA UT UTC uv UWCC V VA Vac VAN VAR VARISTAR vars VC VCC VCL VCO VCXO V/D Vdc VDCL VDU VER VF VFCT VFCTG VFDF VFO VFTG VHF VITS VIU VLAN

U.S. Telephone Association [formerly USITA] Universal Time Coordinated Universal Time ultraviolet Universal Wireless Communications Consortium volt normalized frequency value-added [network service] volt-ampere volts, alternating current value-added network value added reseller variable resistor volt-amperes reactive vacant code virtual circuit virtual channel connection virtual channel link voltage-controlled oscillator voltage-controlled crystal oscillator voice/data volts, direct current virtual data link capability (protocol) video display unit visual display unit version identification version number voice frequency voice frequency carrier telegraph voice frequency carrier telegraph voice frequency distribution frame variable-frequency oscillator voice-frequency telegraph very high frequency vertical interval test signal voiceband interface unit virtual local area network

VLF V/m VNL VNLF vocoder VOD vodas vogad VoIP volcas vox VRC VSAT VSB VSELP VSM VSWR VT VTU vu W WADS WAIS WAN WAND WARC WATM WATS WAWS WMCCS WDM

very low frequency volts per meter via net loss via net loss factor voice-coder video on demand voice over data (link) voice-operated device anti-sing voice-operated gain-adjusting device voice over Internet [protocol] voice-operated loss control and echo/signaling suppression voice-operated relay circuit voice operated transmit vertical redundancy check very small aperture terminal vestigial sideband [transmission] vestigial sideband [modulation] vector sum excited linear prediction vestigial sideband modulation voltage standing wave ratio virtual terminal virtual tributary video teleconferencing unit volume unit Watt wide area data service Wide Area Information Server wide area network wireless ATM network demonstrator World Administrative Radio Conference wireless asynchronous transfer mode Wide Area Telecommunications Service Wide Area Telephone Service Washington Area Wideband System Worldwide Military Command and Control System wavelength-division multiplexing

WG WHSR WI WIN WITS WLAN WLL wmATM WORM wpm wps WPBX WPS WRU WS W3C WTN wv WVDC WWAN WWDSA WWMCCS WWW XB XBT XID XMIT XMSN XMTD Xmtr also TRMTR XO XOFF XON XT

working group White House Situation Room wink wireless information network WWMCCS Intercomputer Network Washington Integrated Telecommunications System wireless local area network wireless local loop wireless mobile ATM write once, read many times words per minute words per second wireless PBX Wireless Priority Service (Program) who-are-you [character] workstation World Wide Web Consortium working telephone number working voltage working voltage direct current wireless wide area network worldwide digital system architecture Worldwide Military Command and Control System World Wide Web crossbar crossbar tandem exchange identification transmit transmission transmitted transmitter crystal oscillator transmitter off transmitter on crosstalk

XTAL Z ZBTSI ZD Zo 0TLP

crystal impedance Zulu time zero-byte time slot interchange zero defects characteristic impedance zero transmission level point

This HTML version of Telecom Glossary 2K was last generated on Fri Aug 3 15:37:18 MDT 2001. References can be found in the Foreword.