| ==Phrack Magazine== | |
| Volume Four, Issue Forty-Three, File 22 of 27 | |
| {Acronyms Part II} | |
| D Data | |
| D Default supervision | |
| D Digits | |
| D Dispach | |
| D Hotel/motel equipment from trouble report (TSPS only) | |
| D-CTL D channel controller (IDEC) | |
| D/A Digital to analog | |
| D1PK DS-1 interface pack (SCM-10S NTI) | |
| D1PK DS-1 interface pack (SCM-10S MUX NTI) | |
| DA Digital data off-net extention INTER/TRA blocal 1-26 | |
| DA Directory assistance | |
| DAC Digital to analog converter | |
| DAC Dispatch Administration Center | |
| DACC Directort assistance call completion | |
| DACK Direct memory access acknowledge | |
| DACOM Data communictions corp. of korea (ROK) | |
| DACS Digital access cross-connect system | |
| DACS Digital accessed and cross-connected system | |
| DACS Directory assistance charging system | |
| DACTVTD Deactivated | |
| DAEDR Delimitation | |
| DAIS Distributed automatic intercept system | |
| DAML Digital added main line (pair gain) | |
| DAMT Direct access mechanize testing | |
| DAP Display administration process | |
| DAP Document application profile | |
| DARC Division alarm recording center | |
| DART Distribution area rehabilitation | |
| DARU Distributed automatic intercept system audio response unit | |
| DAS Data auxiliary set | |
| DAS Directory assistance system | |
| DAS Distributor and scanner | |
| DAS-WDT Distributor and scanner-watch dog timer | |
| DAS/C Directory assistance system/computer | |
| DASD Direct access storage device | |
| DASS2 Digital access signaling system 2 (BT) | |
| DAU Digital access unit | |
| DAV Data above voice | |
| DAY Delete an assembly | |
| DB DSSDS 1.5 mb/s access line INTER/TRA blocal 1-26 | |
| DB Decibel | |
| DBA Data base administrator | |
| DBAC Data base administration center | |
| DBAS Data base administration system | |
| DBCS Data bank control system | |
| DBL Data base load | |
| DBM Database manager | |
| DBMS Data base management system | |
| DBOS Data bank organization system | |
| DBS Duplex bus selector | |
| DBSS Data bank security system | |
| DC Device cinfirmation (C/I channel code) | |
| DC Dial code | |
| DC Direct current | |
| DCC Data collection computer | |
| DCC Data country code (ISO 7498) | |
| DCC Destination code cancellation | |
| DCC Destination code cancellation control | |
| DCC Digroup core controller | |
| DCCS Discontiguous shared segments | |
| DCD Data collection device | |
| DCE Data circuit terminal equipment | |
| DCE Data circuit-terminating equipment | |
| DCE Data communications equipment | |
| DCE Digital carrier equipment | |
| DCG Default cell group | |
| DCH D channel handler | |
| DCH D-channel handling bit | |
| DCH Discharge | |
| DCHOOS D-channel is out of service. | |
| DCL Data clock (i.e. IOM2) | |
| DCL Dec control language | |
| DCLU Digital carrier line uint | |
| DCLU Digital carrier line unit | |
| DCM Digital carrier module | |
| DCME Digital circuit multiplexing equipment | |
| DCMS Distributed call measurement system | |
| DCMU Digital concentrator measurement unit | |
| DCN List disconnected and changed numbers | |
| DCP D channel processor | |
| DCP Duplex central processor | |
| DCPR Detailed contuing property record (pics/dcpr) | |
| DCPSK Differential coherent phase-shift keying | |
| DCS Data communications subsystem | |
| DCS Digital crosconnect system | |
| DCS Digital cross-connect system | |
| DCS Direct current signaling | |
| DCSO Display compleated service order (lmos command) | |
| DCT Digital carrier trunk | |
| DCTB Dct bank | |
| DCTEXT DCT extended | |
| DCTN Defense commercial telecommunications network | |
| DCTS Dimension custom telephone service | |
| DCTUCOM Directly connected test unit common board | |
| DCTUPORT Directly connected test unit port circuit | |
| DCn Device control n | |
| DD Data downstream (i.e. IOM2) | |
| DD Delay dial | |
| DD Disk drives | |
| DD Due date | |
| DD Total switching control center (SCC) and field work time. | |
| DDC Direct department calling | |
| DDCMP Daily display conversation mode and printer | |
| DDD Direct distance dialing | |
| DDGT Digital data group terminal | |
| DDI Direct dialing-in (i.251 A) | |
| DDN Defense data network | |
| DDOV Digital data over voice | |
| DDS DDS loopback test (SARTS command) | |
| DDS Dataphone digital service | |
| DDS Digital data service | |
| DDS Digital data system | |
| DDS Digital data system (the network) dataphone digital | |
| DDS Digital dataphone service | |
| DDS Display the DS table | |
| DDX Digital data exchange | |
| DDX Distributed data exchange | |
| DEAC Deactivation (C/I channel code) | |
| DEACT Deactivate | |
| DEC Digital equipment corporation | |
| DECT Digital european cellular phone | |
| DEL Delete | |
| DEN Digital equipment number | |
| DERP Defective equipment replacement program | |
| DES Data encryption standard | |
| DES Destination | |
| DEST Destinations | |
| DET Detatch MSG. (i.451) | |
| DEV Deviation | |
| DEV Device | |
| DEW Distant early warning (line) | |
| DF Distributing frame | |
| DF Distribution frame | |
| DF HSSDS 1.5 mb/s hub to hub INTER/TRA blocal 1-26 | |
| DFC Disk file controller | |
| DFI Digital facility interface | |
| DFI Digital facility interface. | |
| DFI Digital family interface | |
| DFIH Digital facility interface circuit pair | |
| DFMS Digital facility management system | |
| DFTAC Distributing frame test access circuit | |
| DG HSSDS 1.5 mb/s hub to earth station INTER/TRA blocal 1-26 | |
| DGCT Diagnostic control table | |
| DGN Diagnose | |
| DGN Memory failure in CS/PS diagnostic program - 1AESS mem diag | |
| DH Digital service INTER/TRA blocal 1-26 | |
| DI Deactivation indication (C/I channel code) | |
| DI Direct-in dial INTER/TRA blocal 1-26 | |
| DI Unk division? | |
| DIA Document interchange architecture | |
| DIAG Diagnostic | |
| DIC Digital concentrator | |
| DIC Digital interface controller | |
| DID DI downstream | |
| DID Direct inward dialing | |
| DIF Digital frame interface | |
| DIF Digital interface | |
| DIF Digital interface frame | |
| DIFF Difference | |
| DILEP Digital line engineering program | |
| DIM Data in the middle | |
| DIP Dedicated inside plant COSMOS command | |
| DIP Dip creation option | |
| DIP Document interchange protocol (lower sublayer of OSI layer 6) | |
| DIP Dual in-line package | |
| DIR Direction | |
| DIR Directory | |
| DIR Standard dip report | |
| DIS Disconnect | |
| DIS Display | |
| DISA Direct inward system access | |
| DISABL Disable | |
| DISC Disconnect (LAP-D command) | |
| DISD Direct inward subscriber access | |
| DIST Distribute point board | |
| DIU Deactivate indication | |
| DIU Digital interface unit | |
| DIU Digroup interface unit (DACS) | |
| DIV (Ger) Digital exchange | |
| DIVF (Ger) Div for long distance service | |
| DIVO (Ger) Div for local service | |
| DJ Digit trunk INTER/TRA blocal 1-26 | |
| DK Data link INTER/TRA blocal 1-26 | |
| DL Dial | |
| DL Dictation line INTER/TRA blocal 1-26 | |
| DL1PE DLI 1 parity error | |
| DL5MDA Someone who collects each ISDN abbrevation crossing his way | |
| DLAB Divisor latch access bit | |
| DLC Data link control | |
| DLC Data link controller assignment for clusters | |
| DLC Digital loop carrier | |
| DLCI Data link connection identifier (i.440: SAPI+TEI) | |
| DLCU Digital line carrier unit | |
| DLE Data link escape (ascii control) | |
| DLI Data link interface | |
| DLI0I Data link 0 interrupt | |
| DLI1I Data link 1 interrupt | |
| DLISW DLI switch error | |
| DLL Dial long lines | |
| DLM Data link module | |
| DLN Direct link node | |
| DLNORSP Init response not received from data link. | |
| DLOPE Dual link interface (DLI) 0 parity error | |
| DLP Data level point | |
| DLS Digital line section | |
| DLS Digital link service | |
| DLTHA Display trouble history all (LMOS command) | |
| DLTU Digital line trunk unit | |
| DLTU Digital line/trunk unit | |
| DLU-PG Digital line unit-pair gain | |
| DLUC Digital line unit control | |
| DLYR Delayed readiness | |
| DM DMR | |
| DM Delta modulation | |
| DM Disconnected mode (LAP-D response) | |
| DMA Direct memory access | |
| DMB Digital multipoint bridge | |
| DMERT Duplex multiple environment real time | |
| DMI Digital multiplexed interface | |
| DML Data manipulation logic | |
| DMLHG DSN/AUTOVON MLHG | |
| DMQ Deferred maintenance queue | |
| DMS Data management system | |
| DMS Digital multiplex system (i.e. DMS 10, DMS 100) | |
| DMS Digital multiplexed system | |
| DMU Data manipulation unit | |
| DN Directory number | |
| DN Directory numbers | |
| DN Distribution network panel | |
| DN Down | |
| DN Mail distribution frame - COSMOS defult | |
| DNC Dynamic network controller | |
| DNH Directory Number Hunting | |
| DNHR Dynamic non hierarchical routing | |
| DNHR Dynamic nonhierarchical routing | |
| DNI Digital network interconnecting | |
| DNIC Data network identification code | |
| DNIC Data network identification code (ISO 7498) | |
| DNR Detaled number record | |
| DNR Dialed number recorder | |
| DNX Dynamic network X-connect | |
| DO Direct-out dial INTER/TRA blocal 1-26 | |
| DOC Dynamic overload control | |
| DOC Dynamic overload controls messages. | |
| DOCS Display operator console system | |
| DOD (USA) Dept. of defense | |
| DOJ Department of justice | |
| DOM Data on master group | |
| DOTS Digital office timing supply | |
| DOV Data over voice | |
| DP Demarcation point | |
| DP Dial pulse | |
| DP Digital data-2 4 kb/s INTER/TRA blocal 1-26 | |
| DPA Different premises address | |
| DPA Dispatch | |
| DPA Distributed power architecture | |
| DPAC Dedicated plant assignment card | |
| DPAC Dedicated plant assignment center | |
| DPC Destination point code (SSY) | |
| DPCM Differential PCM | |
| DPE Data path extender | |
| DPGS Digital pair gain systems | |
| DPIDB Direct PIDB | |
| DPIDB Directly connected peripheral interface data bus | |
| DPLL Digital phase locked loop | |
| DPN Dip purge number | |
| DPN-PH Data packet network-packet handler | |
| DPNSS Digital private network signaling system (BT) | |
| DPP Discounted payback period | |
| DPP Distributed processing peripheral | |
| DPR Dip report and removal | |
| DPSK Differential phase shift keying | |
| DPSK Differential phased-shift keying | |
| DPT Data parameter testing | |
| DPT Department name | |
| DPU Digital patch unit | |
| DQ Digital data-4 8 kb/s INTER/TRA blocal 1-26 | |
| DQR Design quota system report | |
| DQS Design quota system | |
| DR Data ready | |
| DR Data receive | |
| DR Deactivate request (C/I channel code) | |
| DR Deactivation request | |
| DR Digital data-9.6 kb/s INTER/TRA blocal 1-26 | |
| DRAM Digital record announcement machine | |
| DRAM Dynamic ram | |
| DRCS Dynamically redefinable character sets | |
| DRHR Division of revenue hourly | |
| DRMU Digital remote measurement unit | |
| DRTLRT Dial repe tie lindal repeatie t | |
| DRU DACS remote unit | |
| DS Data set | |
| DS Digital carrier span | |
| DS Digital signal | |
| DS Direct signal | |
| DS-0 Digital signal 0 (one channel at 64 kb/s) | |
| DS-0A Digital signal at a subrate level on DS-0 for one customer | |
| DS-0B Digital signals at a subrate level on DS-0 facility for one | |
| or more CU | |
| DS-1 Digital signal level one | |
| DS0 Digital signal zer0 | |
| DSBAM Double-sideband amplitude module | |
| DSBLD Disabled (default). | |
| DSC Digital cross-connection systems | |
| DSC Digital subscriber controller AM79C3A | |
| DSCT Digital service copper transport | |
| DSDC Direct service dial capability | |
| DSI Digital speech interpolation | |
| DSIG Direct signaling | |
| DSK Disk | |
| DSL Digital subscriber line | |
| DSL Digital suscriber line | |
| DSLG digital subscriber line group (DSLG) | |
| DSLINIT DSL initialization. | |
| DSM Digital switching module | |
| DSMX (Ger) Digital signal multiplexer | |
| DSN Defense switched network/automatic voice network | |
| DSN Digital signal (level) n | |
| DSNE Double shelf network equipment frame | |
| DSNOFC DSN/AUTOVON office totals | |
| DSNTG DSN/AUTOVON trunk group | |
| DSP Digital signal processing | |
| DSP Digital signal processing or digital signal processor | |
| DSP Digital signal processor | |
| DSP Domain specific part (ISO 7498) | |
| DSR Data set ready | |
| DSR Display results | |
| DSR Dynamic service register | |
| DSRTP Digital service remote test port | |
| DSS Data station selector | |
| DST Destination of order response | |
| DSU Data service unit | |
| DSU Data servicing unit | |
| DSU Digital service unit | |
| DSU2 Diditalservice unit | |
| DSX Digital cross-connect | |
| DSX Digital signal cross-connect | |
| DT DI-group terminal | |
| DT Data through (C/I channel code in test mode) | |
| DT Data transmit | |
| DT Detect dial tone | |
| DT Due time | |
| DT1 Data form class 1 | |
| DTAC Digital access connector | |
| DTAC Digital test access connector | |
| DTAC Digital test access connector (links SMAS and SLC-96) | |
| DTAM Document transfer access and manipulation | |
| DTAS Digital test access system | |
| DTAU Digital test access unit | |
| DTC Data test center | |
| DTC Di-group terminal controller | |
| DTC Digital telephone controller (ARCOFI + IBC + ICC) | |
| DTC Digital trunk controller | |
| DTE Data terminal equipment | |
| DTE Print current date | |
| DTF Dial tone first (pay phone) | |
| DTG Direct trunk group | |
| DTIF Digital transmission interface frame | |
| DTM Data test module | |
| DTM Digital trunk module | |
| DTMF Dual-tone multifrequency | |
| DTR Data terminal ready | |
| DTRK Digital Trunks | |
| DTRK Digital trunks (line and trunk) | |
| DTU Di-group terminal unit | |
| DTU Digital test unit | |
| DU Data upstream (i.e. IOM2) | |
| DU Deactivation request upstream (C/I channel code) | |
| DUIH Direct user interface handler | |
| DUP Data user part | |
| DUP Duplicate | |
| DUR Duration | |
| DUV Data under voice | |
| DVA Design verified and assigned | |
| DVX Digital voice exchange | |
| DW Digital data-56 kb/s INTER/TRA blocal 1-26 | |
| DX Duplex | |
| DY Digital service (under 1 mb/s) INTER/TRA blocal 1-26 | |
| DYRECT Sides dynamic real time communication tester (in sitest) | |
| E E (receive) signal lead (moreover Ear part of E&M) | |
| E Equipment direction | |
| E Remote trunk arrangement position subsystem (rta/pss) from troubl | |
| E&M Receive & transmit/ear & mouth signaling | |
| E-COM Electronic computer originated mail | |
| E1 Equipment system | |
| E800 Enhanced 800 Service | |
| E911 Enhanced 911 | |
| EA Equal access end office | |
| EA Expedited data acknowledgement (SS7: in SCCP) | |
| EA Extended adress | |
| EA Switched acess INTER/TRA blocal 1-26 | |
| EAAT Equal access alternative technologies | |
| EADAS Engineering and administration data acquisition system | |
| EADAS/NM EADAS/network management | |
| EAEO Equial access end office | |
| EAI Emergency action interface | |
| EAP Equal access plan | |
| EARN European academic research network | |
| EAS Extended announcement system | |
| EAS Extended area service | |
| EASD Equal access service date | |
| EB Enfia ii end office trunk INTER/TRA blocal 1-26 | |
| EBAC Equipmentc billing accuracy control | |
| EBCDIC Extended binary coded decimal interexchange code | |
| EBSP EBS prefix translations | |
| EBSP Enhanced business services prefix translations | |
| EC ESS entity and control group number | |
| EC Echo canceller | |
| EC Enfia ii tandem trunk INTER/TRA blocal 1-26 | |
| EC Environment code | |
| EC European community | |
| EC Exchange carriers | |
| ECAP Electronic customer access program | |
| ECC Enter cable change | |
| ECCS Economic c (hundred) call seconds | |
| ECD Equipment configuration database | |
| ECDMAN Equipment configuration database manager | |
| ECF Enhanced connectivity facility | |
| ECL Emitter coupled logic | |
| ECMA European computer manufactueres association | |
| ECPT Electronic coin public telephone | |
| ECR Exchange carrier relations | |
| ECS Electronic crosconnect system | |
| ECS Equipment class of service | |
| ED Enter date | |
| EDAC Electromechanical digital adapter circuit | |
| EDD Envelope delay distortion | |
| EDI Electronic data interchange | |
| EDP Electronic data processing | |
| EDSC Electronic directory customer counts (ISDN BRCS) | |
| EDSX Electronic digital signal x-connect | |
| EDZ Facility emergency assignment list | |
| EE Combined access INTER/TRA blocal 1-26 | |
| EE Initials of supervisor reviewing this ticket. | |
| EEC Electronic equipment cabinet | |
| EECT End-to-end call trace | |
| EEDP Expanded electronic tandem switching dialing plan | |
| EEE Electronic equipment enclosures | |
| EEHO Either end hop off | |
| EEI Equipment-to-equipment interface | |
| EEPROM Electrically erasable programmable read only memory | |
| EF Entrance facility-voice grade INTER/TRA blocal 1-26 | |
| EFCTS Electronic custom telephone service | |
| EFRAP Exchange feeder route analysis program | |
| EG Type #2 telegraph INTER/TRA blocal 1-26 | |
| EIA Electronic industries association | |
| EIS Expanded inband signaling | |
| EISS Economic impact study system | |
| EIU Extended interface unit | |
| EIn Error indication n (C/I channel code) | |
| EKTS Electonic key telephone service | |
| EKTS Electronic key telephone sets | |
| EL Emergency reporting line INTER/TRA blocal 1-26 | |
| ELA Entity load analysis | |
| ELDS Exchange line data service | |
| ELECL Electrical | |
| ELEMNTS Elements | |
| ELI Electrical line interface | |
| EM Emergency reporting center trunk INTER/TRA blocal 1-26 | |
| EM Encription module | |
| EM End of medium (ASCII control) | |
| EMC Electromagnetic capability | |
| EMC Electromagnetic compatibility | |
| EME Electromagnetic emission | |
| EMI Electromagnetic interference | |
| EML Expected measured loss | |
| EMM Expandable mos memory | |
| EMS Electromagnetic susceptibility | |
| EMS Expanded memory specification | |
| EMSCC Electromechanical switching control center | |
| EMV EMC (german) | |
| EN Entity | |
| EN Entity number | |
| EN Exchange network acess facility INTER/TRA blocal 1-26 | |
| ENABL Enable | |
| ENFIA Exchange network facility for interstate access | |
| ENHMT Enhancement | |
| ENQ Enquiry | |
| ENTDT Entered date and/or time | |
| EO End office | |
| EOC Embedded operation channel | |
| EOE Electronic order exchange | |
| EOM End of message | |
| EOS Extended operating system | |
| EOTT End office toll trunking | |
| EP Entrance facility-program grade INTER/TRA blocal 1-26 | |
| EP Expedited data (SS7: in SCCP) | |
| EPIC Extended PIC | |
| EPL Electronic switching system program language | |
| EPROM Erasable programmable read-only memory | |
| EPSCS Enhanced private switched communication service | |
| EQ Equalizer | |
| EQ Equipment only-(network only) assignment INTER/TRA blocal 1-26 | |
| EQPT Equipment | |
| ER Enhancement request | |
| ER Error register | |
| ER Exception report | |
| ERAR Error return address register | |
| ERC Error control (IOS) | |
| EREP Environmental recording editing and printing | |
| ERF Emergency restoration facility | |
| ERL Echo return loss | |
| ERP Effective radiated power | |
| ERPMP Exception report pumper | |
| ERR Error | |
| ERRS Errors | |
| ERTS Error rate test set | |
| ERTS Error rate test sets | |
| ERU Error return address update | |
| ES Extension service-voice grade INTER/TRA blocal 1-26 | |
| ESAC Electronic systems assistance center | |
| ESAP Emergency Stand-Alone prefix | |
| ESAP Emergency stand-alone prefix | |
| ESB Emergency service bureau | |
| ESC Enhanced speech circuit | |
| ESC Escape (ASCII control) | |
| ESC Three way calling USOC | |
| ESCC2 Extended high level serial communication controller | |
| ESCC8 Like ESCC2 | |
| ESD Electrostatic discharge | |
| ESD Extened super framing | |
| ESF Extended super frame | |
| ESF Speed calling USOC | |
| ESFF Extended superframe format | |
| ESL Emergency stand-alone | |
| ESL Essental service | |
| ESL Speed calling 8 code USOC | |
| ESM Call forwarding USOC | |
| ESM Economic study module | |
| ESMTC Electronic system maintance | |
| ESN Electronic serial number (Cell) | |
| ESN Electronic switched network | |
| ESN Emergency service number | |
| ESP Enhanced service procider | |
| ESP Enhanced service providers | |
| ESP Essential service protection | |
| ESP Print entire summary table | |
| ESS Electronic switching system | |
| ESSX Electronic switching systen exchange | |
| EST Established | |
| ESTAB Establish | |
| ESX Call waiting USOC | |
| ET Entrance facility-telegraph grade INTER/TRA blocal 1-26 | |
| ET Exchange termination | |
| ETAS Emergency technical assistance | |
| ETB End of transmission block | |
| ETC Estimated trunk ccs value | |
| ETF Electronic toll fraud | |
| ETL Equipment test list | |
| ETN Electronic tandem network | |
| ETRI Electronics and telecommunications research institute (ROK) | |
| ETS Electronic tandem switching | |
| ETS Electronic translation systems | |
| ETSACI Electronic tandem switching adminstration channel interface | |
| ETSSP ETS status panel | |
| ETX End of text | |
| EU End user | |
| EU Extension service-telegrasph grade INTER/TRA blocal 1-26 | |
| EUPOT End user-point of termination | |
| EV Enhanced emergency reporting trunk INTER/TRA blocal 1-26 | |
| EV Expected value | |
| EVB Busy call forward USOC | |
| EVC Bust call forward extended USOC | |
| EVD Delayed call forward USOC | |
| EVD Delayed call forwarding | |
| EVST (Ger) End exchange | |
| EW Off network MTS/WATS equivalent service INTER/TRA blocal 1-26 | |
| EWSD (Ger) Electronic dialing system (digital) | |
| EX Exercise | |
| EXD ECS crossloading option | |
| EXD Extra digit | |
| EXD Extra digit (MDII) | |
| EXP Extra pulse | |
| EXP Extra pulse (MDII) | |
| EXT Extension | |
| EXTC Expenditure type code | |
| F Facility direction | |
| F Fault (indicator) | |
| F Office or base unit from trouble report. | |
| F1 Facility system | |
| FA Frame aligner | |
| FA Fuse alarm | |
| FAA Facility accepted (SS7 in ISUP) | |
| FAC Facility | |
| FAC Facility Assiment Center | |
| FACD Facility changed msg. | |
| FACS Facilities assignment and control system | |
| FADS Dorce administration | |
| FANALM Fan alarm | |
| FAP Facilities analysis plan | |
| FAR Facility request (SS7: in ISUP) | |
| FAR Federal acquisition regulation | |
| FAS Frame alignment signal | |
| FAST First application system test | |
| FAT File allocation table | |
| FAX Faximile | |
| FC Feature control | |
| FC Frame control | |
| FC From cable | |
| FC/EC Function code and environment code | |
| FCA Final closure abandon (MDII) | |
| FCAP Facility capacity | |
| FCC Federal communications commission | |
| FCC Forward command channel | |
| FCC Frame control center | |
| FCD Frame comtinuity date | |
| FCG False cross or ground | |
| FCS File control systemction | |
| FCS Frame check sequence | |
| FD Private line-data INTER/TRA blocal 1-26 | |
| FDD Frame due date | |
| FDDI Fiber distributed data interface (x3t9.5) | |
| FDI Feeder/distribution interfaces | |
| FDM Frequency division multiplex | |
| FDM Frequency-division multiplexing | |
| FDMA FDM access | |
| FDP Field development program | |
| FDT Frame due time | |
| FDX Full duplex | |
| FDY Set fiscal day for LAC | |
| FEA Custom calling feature/PIC | |
| FEA Customer feature | |
| FEAT Feature | |
| FEAT Features | |
| FEBE Far end block error (IOM2 monitor message) | |
| FEC Forward error correction | |
| FECC Front end communication computer | |
| FED Far end data | |
| FELP Far end loop process | |
| FEMF Foreign electro-motive force | |
| FEPS Facility and equipment planning system | |
| FEV Far end voice | |
| FF Check appropriate space where trouble is located | |
| FF Form feed | |
| FG Group-supergroup spectrum INTER/TRA blocal 1-26 | |
| FGA Feature group A | |
| FGB Feature group B | |
| FGC Feature group C | |
| FGD Feature group D | |
| FGE Feature group E | |
| FGK Feature group K (ISDN Q.931) | |
| FIB Forward indication bit (SS7) | |
| FID Field indentifiers | |
| FIFO First in | |
| FIFO First in first out (storage) | |
| FIL Filter | |
| FIN Facility information msg. | |
| FIOC Frame input/output controller | |
| FIP Facility interface processor | |
| FIPS Federal information processing standards | |
| FISU Fill in signal unit (SS7) | |
| FITL Fiber in the loop | |
| FJ Frame jump (C/I channel code) | |
| FKP False key pulse | |
| FKP False key pulse (MDII) | |
| FL Fault locate | |
| FL Fault location | |
| FLA Flag | |
| FLD Field | |
| FLEXCOM Fiber optic communication | |
| FLR Frame layout report | |
| FLT Flat | |
| FM Frequency modulation | |
| FM01 DCT alarm activated or retired - 1AESS | |
| FM02 Possible failure of entire bank not just frame - 1A | |
| FM03 Error rate of specified digroup - 1AESS | |
| FM04 Digroup out of frame more than indicated - 1AESS | |
| FM05 Operation or release of the loop terminal relay-1AESS | |
| FM06 Result of digroup circuit diagnostics -1AESS | |
| FM07 Carrier group alarm status of specific group - 1AESS | |
| FM08 Carrier group alarm count for digroup - 1AESS | |
| FM09 Hourly report of carrier group alarms - 1AESS | |
| FM10 Public switched digital capacity failure - 1AESS | |
| FM11 PUC counts of carrier group errors - 1AESS | |
| FMAC Facility maintance administration center | |
| FMAC Facility maintenance and control | |
| FMC Force management center | |
| FMM Finite message machine | |
| FN Feature number | |
| FN File name | |
| FNBE Far and near end block error (IOM2 monitor message) | |
| FNPA Foreign numbering plan area | |
| FOA First office application | |
| FOC Fiber optic communications | |
| FON Fiber optics network | |
| FOR Frame order report | |
| FORPOT Foreign potential. | |
| FOS Frame operations summary | |
| FOS-ALC Fiber optic systems maintance - Alcatel | |
| FOS-ROCK Fiber optic system maintance - Rockwell | |
| FOT Forward transfer (SS7: in ISUP) | |
| FP Functional protocol | |
| FPC Foundation peripheral controller | |
| FPC Frequency comparison pilots | |
| FPS Fast packet switching | |
| FR Fire dispatch INTER/TRA blocal 1-26 | |
| FR Fixed resistance | |
| FR Flat rate | |
| FRAC Frame aligner circuit | |
| FRC Forced request configuration | |
| FREQ Frequency | |
| FRJ Facility rejected msg. (SS7 in ISUP) | |
| FRMR Frame reject (LAP-D response) | |
| FRPS Field reliability performance studies | |
| FRQ Facility request message | |
| FRS Flexible route selection | |
| FS File separator | |
| FS/SYM Function Schematic/Symbol Numbers (1AESS Test access) | |
| FSA False start abandon | |
| FSA False start abandon on incoming trunk | |
| FSC Frame synchronization clock (i.e. IOM2) | |
| FSK Frequency shift keying | |
| FSN Forward sequence number | |
| FT Foreign exchange trunk INTER/TRA blocal 1-26 | |
| FT Frame time | |
| FTA Frame transfer analysis | |
| FTC Frame transfer completion | |
| FTE Frame transfer establishment | |
| FTG Final trunk group | |
| FTL Frame transfer lets | |
| FTP File transfer protocol | |
| FTR Frame transfer reprint | |
| FTS Federal telecommunications system | |
| FTW Frame transfer withdrawal | |
| FUNCS Functions | |
| FV Voice grade facility INTER/TRA blocal 1-26 | |
| FW Wideband channel INTER/TRA blocal 1-26 | |
| FWD Forward | |
| FWM Frame work management | |
| FWS Frame work station | |
| FX Foreign exchange | |
| FX Foreign exchange INTER/TRA blocal 1-26 | |
| FXO Foreign exchange circuit office direction | |
| FXS Foreign exchange circuit station direction | |
| G Spare box. use for special studies. | |
| GAP (Ec) group of analysis and provision (for ONP) | |
| GB Great britain | |
| GBS Group bridging service | |
| GC Group card | |
| GCE Gated Oscillator Error | |
| GCI General circuit interface (IOM/u(k0)-interface) | |
| GCON Generic conditions | |
| GCP Generate Control pulse | |
| GCR General configuration register | |
| GCS Group control system | |
| GDSUCOM Global DSU common | |
| GDSUCOM Global digital service unit common | |
| GDX Gated diode crosspoint | |
| GDXACC Gated diode crosspoint access | |
| GDXC Gated diode crosspoint compensator | |
| GDXCON Gated diode crosspoint control circuit | |
| GEISCO General electric information services company | |
| GFR General facility report | |
| GG Getails of reported trouble. | |
| GH Gain hit | |
| GHZ Gigahertz | |
| GID Group ID | |
| GKCCR Generated key collection and compression routine | |
| GLA Generate lists for assignment | |
| GND Ground | |
| GNS Gainslope | |
| GNS Gainslope test (SARTS command) | |
| GOC General order control (TIRKS) | |
| GOS Grade of service | |
| GP Group processor | |
| GPA Gas pressure alarm | |
| GPIB General purpose interface bus | |
| GPPC General purpose power controller | |
| GPS Global positioning system | |
| GR General requirments (BellCoRe) | |
| GRA GRS acknowledgement | |
| GRASP Generic access package | |
| GRD Ground fault. | |
| GRD Ground. | |
| GRID Line unit grid. | |
| GRP Group | |
| GRP MOD Group modulator | |
| GRS Circuit group reset (SS7: in ISUP) | |
| GS Ground start (on-hook normal) | |
| GS Group separator | |
| GSA General services administration | |
| GSAT General telephone and electronics satellite corporation | |
| GST Ground start signaling | |
| GSZ Group size | |
| GTC General telephone company | |
| GTE General telephone electronics | |
| GTEI Global tei | |
| GTS Gamma transfer service | |
| GTT Global title transmission | |
| GWY Gateway | |
| Ger German | |
| H Hold state (in EOC) | |
| H Hours | |
| H Trouble ticket number. subparagraph 5.6.4. | |
| H&D High and dry (trunk test) | |
| H- High- | |
| H-RAP Hardware reliability assurance program | |
| HAC Hands-free add-on circuit (for speakerphone) | |
| HBS Hunt group blocks of spares | |
| HC High capacity 1.544 mb/ps-service code for LATA access | |
| HC Hunt count | |
| HCDS High capacity digital service | |
| HCDS High-capacity digital services | |
| HCFE High-capacity front end | |
| HCSDS High-capacity satellite digital service | |
| HCTDS High-capacity terrestrial digital service | |
| HD High capacity 3.152 mb/ps-service code for LATA access | |
| HDB3 High-density bipolar 3 (cept PRI) | |
| HDFI HSM digital facilities interface | |
| HDLC High level DLC | |
| HDLC High-level data link control | |
| HDSL High bit-rate digital subscriber line | |
| HDTV High definition television (soon to be the new buzz word!!) | |
| HDW Hardware | |
| HDX Half duplex | |
| HE High capacity 6.312 mb/ps-service code for LATA access | |
| HEAP Home energy assistance program | |
| HEHO High end hop off | |
| HF High capacity 6.312-service code for LATA access | |
| HF Hunt-from telephone number | |
| HFCC High capacity facility control center | |
| HFR Hardwara failure rate | |
| HG High capacity 274.176 mb/s-service code for LATA access | |
| HGBAF Hardware group blocking acknowledgment failure | |
| HGR Hunt group report | |
| HGS Hunt group summary | |
| HGUAF Hardware group unblocking acknowledgment failure | |
| HH History header | |
| HH Record of repair activity. | |
| HI High | |
| HI High impedance (C/I channel code) | |
| HI Highway interrupt | |
| HIC Hybrid integrated circuit | |
| HIM Host interface module | |
| HIS Hunting ISH | |
| HK Hook | |
| HL IT Siemens semiconductors (hl) | |
| HLC Highest lead factor group count | |
| HLDG Holding | |
| HLLAPI High level language application program interface | |
| HLSC High-level service circuits | |
| HM1 Intercom plus USOC | |
| HMCL Host message class assignment | |
| HMP Intercom plus | |
| HNPA Home numbering plan area | |
| HNS Hospitality network service | |
| HOBIC Hotel billing information center | |
| HOBIS Hotel billing information system | |
| HOLD Call hold (i.253 b) | |
| HP Hewlett-packard | |
| HP Non-DDS digital data 2.4 kb/s INTER/TRA blocal 1-26 | |
| HPO High performance option | |
| HQ Non-DDS digital data 4.8 kb/s INTER/TRA blocal 1-26 | |
| HR Hour | |
| HR Non-DDS digital data 9.6 kb/s INTER/TRA blocal 1-26 | |
| HRS Hours prefix | |
| HS High capacity subrate-service code for LATA access | |
| HSCC High level serial communication controller sab82520 | |
| HSCX Extended hscc sab82525 | |
| HSM Host switching module | |
| HSSDS High-speed switched digital service | |
| HT Horizontal tabulator | |
| HT Hunt-to telephone number | |
| HTI Highway transfer interrupt | |
| HU High usage | |
| HU High-usage trunk | |
| HUNT Hunting | |
| HUTG High usage trunk group | |
| HW High and wet. | |
| HW High-and-wet | |
| HW Non-DDS digital data 56 kb/s INTER/TRA blocal 1-26 | |
| HW Pcm highway | |
| HZ Hertz | |
| I Cable and pair or associated equipment | |
| I Information (LAP-D command) | |
| I Installation | |
| I Invalid | |
| I&I Investment and inventory | |
| I&M Customer services installation and maintenance | |
| I&M Installation & maintenance | |
| I- Information (numbered i-frames) | |
| I/O Ineffective other | |
| I/O Input/output devices | |
| I/O Tnput/output | |
| I0 Feature removed | |
| I1 Added feature | |
| IA Immediate action | |
| IA Ineffective attempts | |
| IAA Ineffective attempt analysis. | |
| IAAN Immediatel action report | |
| IAC0 DLI 0 access error | |
| IAC1 DLI 1 access error | |
| IACS Intergrated access cross-connected system | |
| IAD Incomplete address detected (incoming) | |
| IAM Initial address msg. (SS7: in ISUP) | |
| IB Instruction buffer | |
| IBC ISDN burst transceiver circuit | |
| IBN Integrated business network | |
| IBROFC ISDN BRCS and Analog Office totals | |
| IC Incoming call (x.25) | |
| IC Independent carrier | |
| IC Installation centers | |
| IC Inter-LATA carrier | |
| IC Inter-exchange carrier | |
| IC Interexchange carriers | |
| IC/MC Installation and maintence centers | |
| ICA Incoming advance | |
| ICA Incoming advance (MDII) | |
| ICAN Individual circuit analysis | |
| ICAO International civil aviation organization | |
| ICC ISDN communications controller | |
| ICC Interstate commerce commission | |
| ICCU Inmate call control unit | |
| ICD Interactive call distribution | |
| ICL Intra-RSM communication link | |
| ICLID Individual calling line id | |
| ICM Integrated call management | |
| ICN Interconnecting network | |
| ICOM (taiwan) integrated communication | |
| ICOT Intercity and outstate trunk | |
| ICP Intercept | |
| ICPOT Interexchange carrier-point of termination | |
| ICSC Inter-LATA customer service center | |
| ICSC Interexchange carrier service center | |
| ICSC Interexchange customer service center | |
| ICUG International closed user groups | |
| ICUP Individual circuit usage and peg count | |
| ICUR Individual circuit usage recorder | |
| ID Idle control code | |
| IDA (gb) interated digital access (b64+b8+d8) | |
| IDC Information distribution companies | |
| IDCI Interim defined central office interface | |
| IDCU Integrated digital carrier unit | |
| IDCU Integrated digital carrier unit . | |
| IDCU Integrated digital carrier unit i.e. AT&T Series 5 RT FP 303G | |
| IDDD International direct distance dialing | |
| IDEC ISDN d-channel exchange controller | |
| IDF Intermediate distributing frame | |
| IDI Initial domain identifier (ISO 7498) | |
| IDLC Integrated digital loop carrier | |
| IDLC Intergrated digital loop carrier | |
| IDP Individual dialing plan | |
| IDPC Integrated data protocol controller | |
| IDS Internal directory system | |
| IDVC Integrated data/voice channel | |
| IEC ISDN echo cancellation circuit | |
| IEC Interexchange carrier | |
| IEC International electrotechnical comission | |
| IEC-P (old name of iec-q3) | |
| IEC-Q1 Iec for 2b1q peb2091 | |
| IEC-Q2 Iec-q specially for lt and NT1 (without microprocessor) | |
| IEC-Q3 Iec-q with parallel processor interface (i.e. for daml) | |
| IEC-T Iec for 4b3t peb2090 | |
| IEEE Institute of electrical and electronics engineers | |
| IEPC ISDN exchange power controller | |
| IF Intermediate frequency | |
| IFAC Integrated digital carrier unit facility | |
| IFRB International frecuency registration board | |
| IFRPS Intercity facility relief planning system | |
| IFS (switzerland) integrated telecom service | |
| IGS Idenitfy graphic subrepertoire (teletex) | |
| IIN Integrated information network | |
| IJR Input a jeopardy reason | |
| ILC ISDN link controller | |
| ILINE IDCU line counts. | |
| IM Input mux | |
| IM Interface module | |
| IMA Additional ineffective machine attempts | |
| IMAS Integrated mass announcement system | |
| IMC IOS mailbox control | |
| IMCAT Input message catalog | |
| IMCF Interoffice multiple call forwarding | |
| IMD Intermodulation distortion | |
| IMM Input message manual | |
| IMMU IOS memory management unit | |
| IMP Impedance | |
| IMP Impules per minute | |
| IMP Interpersonal messaging protocol (x.420: p2) | |
| IMS Interprocessor message switch | |
| IMT Inter-machine trunk | |
| IMTS Improved mobile telephone service | |
| IMU Input measured ccs usage data | |
| IN Intelligent network | |
| IN/1 Intelligent network/1 | |
| INA Intergrated network access | |
| INAP Intelligent network access point | |
| INC Incoming trunk groups | |
| INC International calling | |
| INC International carrier | |
| INC SEL Incoming selector | |
| INCAS-A Integrated network cost analysis - access | |
| INCAS-LT Integrated network cost analysis - local and toll | |
| INCAS-S Integrated network cost analysis - shared | |
| INCAS/E Integrated network cost analysis system | |
| INCAS/I Integrated network cost analysis system - embedded | |
| INCIS Integrated network cost information system | |
| INCP Incomplete | |
| IND Individual | |
| INF Information | |
| INF Information (SS7: in ISUP) | |
| INIT Allocation table initalization | |
| INL Inter node link | |
| INN Inter node network | |
| INQ Complete circuit inquiry | |
| INR Information request (SS7: in ISUP) | |
| INS (japan) information network system (b64+b16+d8) | |
| INT Interrupt (i.e. C/I channel code) | |
| INTCCTRL International code control (NTI) | |
| INTCHG Interexchange | |
| INTEGRIS Integrated results information service | |
| INTELSAT International telecommunications satellite consortium | |
| INTR Interrupt | |
| INW INWATS [code 258(8000-8299)] | |
| INWATS Inward wide area telecommunications system | |
| INWATS Inward wide area telephone service | |
| INWBLKD INWATS returned blocked | |
| INWBLKD Inward wide area telecommunications service (INWATS) returned | |
| blocked | |
| INWBUSY INWATS all lines busy | |
| INWCCBL INWATS code control blocked | |
| INWDBOV INWATS data base overload | |
| INWDBTO INWATS data base timeout | |
| INWDSBL INWATS direct signaling blocked | |
| INWNNPA INWATS nonpurchased NPA | |
| INWNNPA INWATS nonpurchased numbering plan area (NPA) | |
| INWNOXL INWATS returned no translation | |
| INWONPA INWATS invalid ONPA | |
| INWONPA INWATS invalid originating numbering plan area (ONPA) | |
| INWOVLD INWATS returned overload | |
| INWUNEQ INWATS returned unequipped | |
| INWVLIN INWATS vacant line number | |
| INWVNXX INWATS vacant NXX | |
| IO Inward operator | |
| IOAU Input/output access unit (univac) | |
| IOC Independent operating company | |
| IOC Input/output controler (shelf) | |
| IOC Integrated optical circuit | |
| IOC International overseas center | |
| IOCC International overseas completion center | |
| IOCP Input/output configuration process | |
| IOCS Input/output control system | |
| IODB IDCU on-demand B-channel | |
| IOI Secondary input/output interface pack(s) | |
| IOM ISDN-oriented modular (architecture and interfaces) | |
| IOM2 Extended iom | |
| IOMI Input/output microprocessor interface | |
| IOP Input-output processor | |
| IOP Input/output Processor | |
| IOP Input/output driver | |
| IOP Input/output processor | |
| IOS ISDN operational software | |
| IOS Input/output supervisor (IBM) | |
| IOS Inventory order system | |
| IOSF Input/output shelf assignment | |
| IOT Inter-office trunk | |
| IOT Interoffice test command (SARTS command) | |
| IOT Interoffice testing | |
| IOTC International originating toll center | |
| IP Information provider | |
| IP Inprogress | |
| IP Intermediate point | |
| IP Internet protocol | |
| IPABX ISDN pabx | |
| IPAC ISDN pc adapter circuit | |
| IPACS Interactive planning & control system | |
| IPAT ISDN primary access transceiver | |
| IPB Sipb | |
| IPBC IOM2 PBC (old name for EPIC) | |
| IPC Inter-process communication | |
| IPC Interprocess communication | |
| IPCS IOS process control system | |
| IPCS Installation product costing system | |
| IPCS Interactive problem control system | |
| IPIB Intelligent personal computer interface board | |
| IPIDB IDCU peripheral interface data bus | |
| IPL Initial program load | |
| IPL Interoffice private line signaling | |
| IPL Interoffice private line signaling test (SARTS command) | |
| IPLAN Integrated planning and analysis system | |
| IPLS InterLATA private line services | |
| IPM Impulse per minute | |
| IPM Impulses per minute | |
| IPM Interruptions per minute | |
| IPP IOS protocol part | |
| IPP Integrated planning process | |
| IPPC Interdepartmental project planning committee | |
| IPR Installation performance results system | |
| IPS Installation performance results | |
| IPS Integrated Provisioning System | |
| IPS Integrated provisions system | |
| IPX Integrated packet exchange | |
| IQS Instant request system | |
| IR Incoming register | |
| IRBR Integrated resource billing report system | |
| IRC International record carrier | |
| IRIS Industry relations information system | |
| IRLF Incoming register link frame | |
| IRM Information resource management | |
| IRMC Incoming register marker connector | |
| IRO Industry relations operations | |
| IROR Internal rate of return | |
| IRP Integrated revenue planning | |
| IRPC ISDN remote power control psb2120 | |
| IRR Internal rate of return system | |
| IRRS Interactive request and retrieval system | |
| IRS Industrial revenue summary | |
| IRT IDCU remote digital terminal | |
| IRU Integrated recovery utility (sperry) | |
| IS Interrupt set | |
| IS/SADQ Interstate special access demand quantification | |
| ISA Indicate status application | |
| ISAC-P ISDN subscriber access controller | |
| ISAC-S ISDN subscriber access controller | |
| ISAM Indexed sequential access method | |
| ISC Intelligent serial controller | |
| ISC International switching center | |
| ISC Planintercompany services coordination plan | |
| ISC/TE Information systems center for technical education | |
| ISCAR Information systems costs analysis reports | |
| ISCOM SWBT intercompany service coordination (ISC) order monitor | |
| ISCP Integrated service control point | |
| ISCP/MSAP ISCP/multi-service application platform | |
| ISCP/SPOCK ISCP/service provisioning and on-line creation tool kit software | |
| ISDN Integrated services digital network | |
| ISF Inquire on a single facility | |
| ISG Isolated system grounding | |
| ISH Complete circuit inquiry short | |
| ISI Industry support layout | |
| ISIS Interstate settlements information system | |
| ISLM Integrated services line module | |
| ISLU Integrated services line unit | |
| ISLUCC Integrated services line unit common controller | |
| ISLUCD Integrated services line unit common data | |
| ISLUHLSC Integrated services line unit high level service circuit | |
| ISLUMAN Integrated services line unit metallic access network | |
| ISLURG Integrated services line unit ringing generator | |
| ISM ISDN switching module | |
| ISM Interactive synchronous mode | |
| ISMP Industry specific measurement plan | |
| ISMS Integrated service management system | |
| ISMTL Information systems management training | |
| ISN Information systems network | |
| ISN Integrated systems network | |
| ISNET Interim solution network (Kansas city only) | |
| ISO Information systems organization | |
| ISO International organization for standardization | |
| ISOFC ISDN office totals | |
| ISOPDB Information systems organization planning data base | |
| ISOSS Intercompany service order switching system | |
| ISP Intermediate service part | |
| ISPBX Integrated systems PBX | |
| ISPC International signaling point code (SS7) | |
| ISPF Interactive system productivity facility | |
| ISPI ISDN packet interface | |
| ISRP Information systems rules panel | |
| ISS Integrated switching system | |
| ISS Issue | |
| ISSANRC Interstate special access non-recurring | |
| ISSC Interfunction special service coordination | |
| ISSCO Intertoll | |
| ISSN Integrated special services network | |
| ISSN Intergrated specal services network | |
| ISSS ISDN supporting system | |
| ISTA Interrupt status register | |
| ISUP ISDN user part | |
| ISUP ISDN user part (SS7: q.76x) | |
| ISUP Integrated services user part | |
| IT Inactivity test (SS7: in SCCP) | |
| IT Intertandem tie trunk INTER/TRA blocal 1-26 | |
| ITAC ISDN terminal adaptor circuit | |
| ITC Independent telephone company | |
| ITC Interdepartmental training center at dallas-texas for | |
| ITD Intertoll dial | |
| ITEA Interoffice trunks engineering and administration | |
| ITF Integrated test facility | |
| ITG Intergrated traffic generator | |
| ITIMS Integrated transportation information management system | |
| ITIMS/IE Itims/information expert | |
| ITM Cable pair item number | |
| ITNA Improves thrid number acceptance | |
| ITNO Item number | |
| ITS Institute of telecommunication science | |
| ITS Integrated test system | |
| ITS Interactive training system | |
| ITSE Incoming trunk service evaluation | |
| ITSO Incoming trunk service observation | |
| ITSTC Information technology steering committee (cen | |
| ITT Idle trunk test | |
| ITU International telecommunication union | |
| ITU International telecommunications union | |
| ITVSE Intermediary transport vendor service center | |
| ITW Instructional technology workshop | |
| IU Network/port interface unit | |
| IUP Installed user program (IBM) | |
| IVD Integrated voice data | |
| IVP Installation verification procedures | |
| IVP Installation verification program | |
| IVTS International video teleconferencing service | |
| IWF Interworking facility (gateway) | |
| IWU Interworking unit (gateway) | |
| IX Interactive executive | |
| IXC Or icinterexchange carrier | |
| IXM Interexchange mileage | |
| IZ Interzone | |