| ==Phrack Inc.== | |
| Volume Two, Issue 20, File 11 of 12 | |
| Metal Shop Private's -- Acronyms | |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
| 3ACC 3A Central Control | |
| 5XB COER 5 X-Bar Central Office Equipment Reports system | |
| A/D Analog to Digital | |
| AAX Automated Attendant eXchange | |
| ABATS Automatic Bit Access Test System | |
| ABHC Average Busy Hour Calls | |
| ABS Alternative Billing Service | |
| ABSBH Average Busy Season Busy Hour | |
| ACB Annoyance Call Bureau | |
| ACC Audio Communications Controller | |
| ACCS Automated Calling Card Service | |
| ACD Automatic Call Distributor | |
| ACDA Automatic Call Disposition Analyzer | |
| ACE Automatic Calling Equipment | |
| ACF Advanced Communications Functions | |
| ACH Attempt per Circuit per Hour | |
| ACOF Attendant Control Of Facilities | |
| ACP ACtion Point | |
| ACSNET Acedemic Computing Services NETwork | |
| ACSU Advanced t-1 Channel Service Unit | |
| ACTS Automated Coin Toll Service | |
| ACU Alarm Control Unit | |
| ACU Automatic Calling Unit | |
| ADCCP Advanced Data Communications Control Procedure | |
| ADCI Automatic Display Call Indicator | |
| ADN Abbreviated Dialing Number | |
| ADS Advanced Digital System | |
| ADS Audio Distribution System | |
| ADS Auxilary Data System | |
| AFACTS Automatic FACilities Test System | |
| AFADS Automatic Force Adjustment Data System | |
| AFSK Automatic Frequency Shift Keying | |
| AIC Automatic Intercept Center | |
| AICC Automatic Intercept Communications Controller | |
| AIOD Automatic Identificated Outward Dialing | |
| AIS Automatic Intercept System | |
| ALBO Automatic Line BuildOut | |
| ALFE Analog Line Front End | |
| ALGOL ALGOrhythmic computer Language | |
| ALI Automatic Location Indentification | |
| ALIT Automatic Line Insulation Testing | |
| ALRU Automatic Line Record Update | |
| ALS Automated List Service | |
| AM Administrative Module | |
| AM Amplitude Modulation | |
| AMA Automatic Message Accounting | |
| AMACS AMA Collection System | |
| AMARC AMA Recording Center | |
| AMASE AMA Standard Entry | |
| AMAT AMA Transmitter | |
| AMATPS AMA TeleProcessing System | |
| AMERITECH AMERican Information TECHnologies | |
| AMPS Advanced Mobile Phone Service | |
| AN Associated Number | |
| ANA Automatic Number Announcement | |
| ANC All Number Calling | |
| ANI Automatic Number Identification | |
| ANIF Automatic Number Identification Failure | |
| ANSI American National Standards Institute | |
| AOSS Auxilliary Operator Service System | |
| AP Attached Processor | |
| APC AMARC Protocol Converter | |
| APS Automatic Protection Switch | |
| AR Alarm Report | |
| ARC Audio Response Controller | |
| ARIS Audichron Recorded Information System | |
| ARS Alternate Route Selection | |
| ARSB Automated Repair Service Bureau | |
| ARU Audio Response Unit | |
| ASCII American Standard Code for Information Interchange | |
| ASOC Administrative Service Oversight Center | |
| ASPEN Automatic System for Performance Evaluation of the Network | |
| AT Access Tandem | |
| AT&T American Telephone and Telegraph | |
| ATB All Trunks Busy | |
| ATC Automatic Transmission Control | |
| ATH Abbreviated Trouble History | |
| ATI Automatic Test Inhibit | |
| ATIS Automatic Transmitter Identification System | |
| ATM Automatic Teller Machine | |
| ATMS Automated Trunk Measurement System | |
| ATP All Tests Pass | |
| ATR Alternate Trunk Routing | |
| ATRS Automated Trouble Reporting System | |
| ATTC Automatic Transmission Test and Control circuit | |
| ATTCOM AT&T COMmunications | |
| ATTIS AT&T Information System | |
| AUDIX AUDio Information eXchange | |
| AUTODIN AUTOmatic DIgital Network | |
| AUTOSEVCOM AUTOmatic SEcure Voice COMmunications | |
| AUTOVON AUTOmatic VOice Network | |
| AUXF AUXillary Frame | |
| AVD Alternate Voice Data | |
| B6ZS Bipolar with 6 Zero Subsitution | |
| B911 Basic 911 | |
| BAMAF BELLCORE AMA Format | |
| BANCS Bell Administrative Network Communications System | |
| BAPCO Bellsouth Advertising & Publishing COmpany | |
| BCC Blocked Call Cleared | |
| BCD Binary Coded Decimal | |
| BCD Blocked Call Delayed | |
| BCS Batch Change Supplement | |
| BDT Billing Data Transmitter | |
| BEF Band Elimination Filter | |
| BELLCORE BELL COmmunications REsearch | |
| BER Bit Error Rate | |
| BERT Bit Error Rate Test | |
| BETRS Basic Exchange Telecommunications Radio Service | |
| BHC Busy Hour Calls | |
| BISP Business Information System Program | |
| BITNET Because-It's-Time NETwork | |
| BL/DS Busy Line/Don't Answer | |
| BLF Busy Line Field | |
| BLS Business Listing Service | |
| BLV Busy Line Verification | |
| BNS Billed Number Screening | |
| BOC Bell Operating Company | |
| BOR Basic Output Report | |
| BORSCHT Battery, Overvoltage, Ringing, Supervision, Coding, Hybrid Test | |
| ing | |
| BOS Business Office Supervisor | |
| BOSS Billing and Order Support System | |
| BOT Beginning Of Tape | |
| BPI Bits Per Inch | |
| BPOC Bell Point Of Contact | |
| BPS Bits Per Second | |
| BPSS Basic Packet-Switching Service | |
| BRAT Business Residence Account Tracking system | |
| BRCS Business Residence Custom Service | |
| BRI Basic Rate Interface | |
| BRM Basic Remote Module | |
| BS Banded Signaling | |
| BSA Basic Serving Arrangements | |
| BSBH Busy Season Busy Hour | |
| BSC Business Service Center | |
| BSCM BiSynchronous Communications Module | |
| BSE Basic Service Elements | |
| BSF Bell Shock Force | |
| BSOC Bell Systems Operating Company | |
| BSP Bell System Practice | |
| BSRFS Bell System Reference Frequency Standard | |
| BST Basic Services Terminal | |
| BSTJ Bell System Technical Journal | |
| BT Bus Terminator | |
| BTAM Basic Telecommunications Access Message | |
| BTL Bell Telephone Laboratories | |
| BTN Billing Telephone Number | |
| BTU British Thermal Unit | |
| BVA Billing Validation Application | |
| BVC Billing Validation Center | |
| BWM Broadcast Warning Message | |
| BWT Broadcast Warning TWX | |
| BWTS BandWidth Test Set | |
| CA CAble | |
| CABS Carrier Access Billing System | |
| CAC Calling-card Authorization Center | |
| CAC Carrier Access Code | |
| CAC Circuit Administration Center | |
| CAC Customer Administration Center | |
| CAD Computer-Aided Dispatch | |
| CADV Combined Alternate Data/Voice | |
| CAI Call Assembly Index | |
| CAIS Colocated Automatic Intercept System | |
| CALRS Centralized Automatic Loop Reporting System | |
| CAMA Centralized Automatic Message Accounting | |
| CAROT Centralized Automatic Reporting On Trunks | |
| CAS Circuit Associated Signaling | |
| CAS Computerized Autodial System | |
| CAT Craft Access Terminal | |
| CATLAS Centralized Automatic Trouble Locating and Analysis System | |
| CBS CrossBar Switching | |
| CBX Computerized Branch eXchange | |
| CC Central Control | |
| CC Common Control | |
| CC Country Code | |
| CCC Central Control Complex | |
| CCC Computer Control Center | |
| CCH Connections per Circuit per Hour | |
| CCIR Comite' Consultatif International des Radio Communications | |
| CCIS Common Channel Interoffice Signaling | |
| CCITT Comite' Consultatif International Telegraphique et Telephonique | |
| CCNC Common Channel Network Controller | |
| CCNC Computer/Communications Network Center | |
| CCR Customer-Controlled Reconfiguration | |
| CCS Common Channel Signaling | |
| CCS Hundred (C) Call Seconds | |
| CCSA Common-Control Switching Arrangement | |
| CCT Central Control Terminal | |
| CCTAC Computer Communications Trouble Analysis Center | |
| CCU COLT Computer Unit | |
| CCV Calling Card Validation | |
| CDA Call Data Accumulator | |
| CDA Coin Detection and Announcement | |
| CDAR Customer Dialed Account Recording | |
| CDCF Cumulative Discounted Cash Flow | |
| CDF Combined Distributing Frame | |
| CDI Circle Digit Identification | |
| CDO Community Dial Office | |
| CDPR Customer Dial Pulse Receiver | |
| CDR Call Dial Rerouting | |
| CDS Craft Dispatch System | |
| CEF Cable Entrance Facility | |
| CEI Comparably Efficient Interconnection | |
| CEV Controlled Environment Vault | |
| CF Coin First | |
| CFCA Communications Fraud Control Association | |
| CFR Code of Federal Regulations | |
| CGN Concentrator Group Number | |
| CIC Carrier Identification Code | |
| CICS Customer Information Control System | |
| CII Call Identity Index | |
| CIS Customized Intercept Service | |
| CLASS Centralized Local Area Selective Signaling | |
| CLASS Custom Local Area Signaling Service | |
| CLDN Calling Line Directory Number | |
| CLEI Common-Language Equipment Identification | |
| CLI Calling Line Ident | |
| CLID Calling Line IDentification | |
| CLLI Common-Language Location Identification | |
| CMAC Centralized Maintenance and Administration Center | |
| CMC Construction Maintenance Center | |
| CMDF Combined Main Distributing Frame | |
| CMDS Centralized Message Data System | |
| CMS Call Management System | |
| CMS Circuit Maintenance System | |
| CMS Communications Management Subsystem | |
| CMS Conversational Monitoring System | |
| CMT Cellular Mobile Telephone | |
| CMU COLT Measurement Unit | |
| CN Change Notice | |
| CN/A Customer Name/Address | |
| CNA Communications Network Application | |
| CNAB Customer Name/Address Bureau | |
| CNCC Customer Network Control Center | |
| CNI Common Network Interface | |
| CNMS Cylink Network Management System | |
| CNS Complimentary Network Service | |
| CO Central Office | |
| COAM Customer Owned And Maintained | |
| COC Circuit Order Control | |
| COCOT Customer-Owned Coin-Operated Telephone | |
| CODCF Central Office Data Connecting Facility | |
| CODEC COder-DECoder | |
| COE Central Office Equipment | |
| COEES COE Engineering System | |
| COLT Central Office Line Tester | |
| COMSAT COMmunications SATellite | |
| CONN CONNector | |
| CONTAC Central Office NeTwork ACcess | |
| CONUS CONtinental United States | |
| CORNET CORperate NETwork | |
| COSMIC COmmon Systems Main InterConnection frame system | |
| COSMOS COmputerized System for Mainframe OperationS | |
| COT Central Office Terminal | |
| CP Control Program | |
| CPC Cellular Phone Company | |
| CPC Circuit Provisioning Center | |
| CPD Central Pulse Distributor | |
| CPE Customer-Premises Equipment | |
| CPH Cost Per Hour | |
| CPI Computer Private branch exchange Interface | |
| CPM Cost Per Minute | |
| CPMP Carrier Performance Measurement Plan | |
| CPU Central Processing Unit | |
| CRAS Cable Repair Administrative System | |
| CRC Customer Record Center | |
| CRC Cyclic Redundancy Check | |
| CREG Concentrated Range Extension with Gain | |
| CRFMP Cable Repair Force Management Plan | |
| CRIS Customer Record Information System | |
| CRS Centralized Results System | |
| CRSAB Centralized Repair Service Answering Bureau | |
| CRT Cathode Ray Tube | |
| CSA Carrier Serving Area | |
| CSACC Customer Service Administration Control Center | |
| CSAR Centralized System for Analysis Reporting | |
| CSC Cell Site Controller | |
| CSDC Circuit Switched Digital Capability | |
| CSNET Computer Science NETwork | |
| CSO Central Services Organization | |
| CSS Computer Sub-System | |
| CSU Channel Service Unit | |
| CTC Central Test Center | |
| CTM Contac Trunk Module | |
| CTMS Carrier Transmission Measuring System | |
| CTO Call Transfer Outside | |
| CTSS Cray Time Sharing System | |
| CTT Cartridge Tape Transport | |
| CTTC Cartridge Tape Transport Controller | |
| CTTN Cable Trunk Ticket Number | |
| CU Control Unit | |
| CU Customer Unit | |
| CU/TK Common Update/EQuipment system | |
| CUCRIT Capital Utilization CRITeria | |
| CVR Compass Voice Response | |
| CWC City-Wide Centrex | |
| D/A Digital to Analog | |
| DA Directory Assistance | |
| DACS Digital Access Cross-connect System | |
| DACS Directory Assistance Charging System | |
| DAIS Distributed Automatic Intercept System | |
| DARC Division Alarm Recording Center | |
| DARU Distributed automatic intercept system Audio Response Unit | |
| DAS Directory Assistance System | |
| DAS Distributor And Scanner | |
| DAS-WDT Distributor And Scanner-Watch Dog Timer | |
| DASD Direct Access Storage Device | |
| DAV Data Above Voice | |
| DB Decibel | |
| DBA Data Base Administrator | |
| DBAC Data Base Administration Center | |
| DBAS Data Base Administration System | |
| DBM DataBase Manager | |
| DBS Duplex Bus Selector | |
| DCCS DisContiguous Shared Segments | |
| DCE Data Circuit-terminating Equipment | |
| DCH D Channel Handler | |
| DCL DEC Control Language | |
| DCLU Digital Carrier Line Uint | |
| DCM Digital Carrier Module | |
| DCMS Distributed Call Measurement System | |
| DCMU Digital Concentrator Measurement Unit | |
| DCP Duplex Central Processor | |
| DCPR Detailed Contuing Property Record (PICS/DCPR) | |
| DCPSK Differential Coherent Phase-Shift Keying | |
| DCS Digital Crosconnect System | |
| DCT Digital Carrier Trunk | |
| DCTN Defense Commercial Telecommunications Network | |
| DCTS Dimension Custom Telephone Service | |
| DDC Direct Department Calling | |
| DDD Direct Distance Dialing | |
| DDN Defense Data Network | |
| DDS Digital Data Service | |
| DDS Digital Data System | |
| DDS Digital Dataphone Service | |
| DDX Distributed Data eXchange | |
| DEC Digital Equipment Corporation | |
| DERP Defective Equipment Replacement Program | |
| DES Data Encryption Standard | |
| DEW Distant Early Warning (line) | |
| DFI Digital Facility Interface | |
| DFMS Digital Facility Management System | |
| DIC Digital Interface Controller | |
| DID Direct Inward Dialing | |
| DIF Digital Interface Frame | |
| DIM Data In the Middle | |
| DIP Dual In-line Package | |
| DISA Direct Inward System Access | |
| DIU Digital Interface Unit | |
| DLC Digital Loop Carrier | |
| DLCU Digital Line Carrier Unit | |
| DLL Dial Long Lines | |
| DLS Digital Link Service | |
| DLTU Digital Line/Trunk Unit | |
| DLU-PG Digital Line Unit-Pair Gain | |
| DM Delta Modulation | |
| DMA Direct Memory Access | |
| DMI Digital Multiplexed Interface | |
| DML Data Manipulation Logic | |
| DMS Data Management System | |
| DMS Digital Multiplexed System | |
| DMU Data Manipulation Unit | |
| DN Directory Number | |
| DNC Dynamic Network Controller | |
| DNHR Dynamic Non Hierarchical Routing | |
| DNIC Data Network Identification Code | |
| DNR Dialed Number Recorder | |
| DNX Dynamic Network X-connect | |
| DOC Dynamic Overload Control | |
| DOCS Display Operator Console System | |
| DOJ Department Of Justice | |
| DOM Data On Master group | |
| DOTS Digital Office Timing Supply | |
| DOV Data Over Voice | |
| DP Demarcation Point | |
| DP Dial Pulse | |
| DPAC Dedicated Plant Assignment Center | |
| DPC Destination Point Code | |
| DPE Data Path Extender | |
| DPN-PH Data Packet Network-Packet Handler | |
| DPP Discounted Payback Period | |
| DPSK Differential Phased-Shift Keying | |
| DR Data Ready | |
| DR Data Receive | |
| DRMU Digital Remote Measurement Unit | |
| DS Digital carrier Span | |
| DS Digital Signal | |
| DS Direct Signal | |
| DSBAM Double-SideBand Amplitude Module | |
| DSDC Direct Service Dial Capability | |
| DSI Digital Speech Interpolation | |
| DSN Digital Signal (level) N | |
| DSP Digital Signal Processor | |
| DSR Dynamic Service Register | |
| DSS Data Station Selector | |
| DSU Data Service Unit | |
| DSX Digital System X-connect | |
| DT Data Transmit | |
| DT Di-group Terminal | |
| DTAS Digital Test Access System | |
| DTC Di-group Terminal Controller | |
| DTC Digital Trunk Controller | |
| DTE Data Terminal Equipment | |
| DTF Dial Tone First | |
| DTG Direct Trunk Group | |
| DTIF Digital Transmission Interface Frame | |
| DTMF Dual Tone Multi Frequency | |
| DTU Di-group Terminal Unit | |
| DUV Data Under Voice | |
| DVX Digital Voice eXchange | |
| E&M rEceive & transMit/Ear & Mouth signaling | |
| E-COM Electronic Computer Originated Mail | |
| E911 Enhanced 911 | |
| EADAS Engineering and Administrative Data Acquisition System | |
| EADAS/NM EADAS/Network Management | |
| EAEO Equal Access End Office | |
| EARN European Academic Research Network | |
| EAS Extended Announcement System | |
| EAS Extended Area Service | |
| EASD Equal Access Service Date | |
| EBCDIC Extended Binary Coded Decimal Interexchange Code | |
| ECAP Electronic Customer Access Program | |
| ECC Enter Cable Change | |
| ECCS Economic C (hundred) Call Seconds | |
| ECF Enhanced Connectivity Facility | |
| ECPT Electronic Coin Public Telephone | |
| ECS Electronic Crosconnect System | |
| EDAC Electromechanical Digital Adapter Circuit | |
| EDI Electronic Data Interchange | |
| EDP Electronic Data Processing | |
| EDSX Electronic Digital Signal X-connect | |
| EECT End-to-End Call Trace | |
| EEDP Expanded Electronic tandem switching Dialing Plan | |
| EEHO Either End Hop Off | |
| EEI Equipment-to-Equipment Interface | |
| EFRAP Electronic Feeder Route Analysis Program | |
| EIA Electronics Industries Assotiation | |
| EIS Expanded Inband Signaling | |
| EISS Economic Impact Study System | |
| EKTS Electronic Key Telephone Sets | |
| EML Expected Measured Loss | |
| EMS Expanded Memory Specification | |
| ENFIA Exchange Network Facility for Interstate Access | |
| EO End Office | |
| EOE Electronic Order Exchange | |
| EOS Extended Operating System | |
| EOTT End Office Toll Trunking | |
| EPL Electronic switching system Program Language | |
| EPROM Erasable Programmable Read-Only Memory | |
| EPSCS Enhanced Private Switched Communication Service | |
| ER Error Register | |
| ERAR Error Return Address Register | |
| EREP Environmental Recording Editing and Printing | |
| ERL Echo Return Loss | |
| ERP Effective Radiated Power | |
| ERU Error Return address Update | |
| ESAC Electronic Surveillance Assistance Center | |
| ESB Emergency Service Bureau | |
| ESF Extended SuperFrame | |
| ESL Emergency Stand-Alone | |
| ESN Electronic Serial Number | |
| ESN Electronic Switched Network | |
| ESP Enhanced Service Provider | |
| ESS Electronic Switching System | |
| ESSX Electronic Switching Systen eXchange | |
| ETAS Emergency Technical ASsistance | |
| ETF Electronic Toll Fraud | |
| ETN Electronic Tandem Network | |
| ETS Electronic Tandem Switching | |
| ETS Electronic Translation System | |
| ETSACI Electronic Tandem Switching Adminstration Channel Interface | |
| ETSSP ETS Status Panel | |
| FA Fuse Alarm | |
| FACS Facilities Assignment and Control System | |
| FAR Federal Acquisition Regulation | |
| FAST First Application System Test | |
| FAT File Allocation Table | |
| FCAP Facility CAPacity | |
| FCC Federal Communications Commission | |
| FCC Forward Command Channel | |
| FCG False Cross or Ground | |
| FCS File Control Systemction | |
| FCS Frame Check Sequence | |
| FDM Frequency-Division Multiplexing | |
| FDP Field Development Program | |
| FDX Full DupleX | |
| FED Far End Data | |
| FEMF Foreign Electro-Motive Force | |
| FEPS Facility and Equipment Planning System | |
| FEV Far End Voice | |
| FGA Feature Group A | |
| FGB Feature Group B | |
| FGC Feature Group C | |
| FGD Feature Group D | |
| FIFO First In, First Out | |
| FIOC Frame Input/Output Controller | |
| FIP Facility Interface Processor | |
| FIPS Federal Information Processing Standards | |
| FM Frequency Modulation | |
| FMAC Facility Maintenance And Control | |
| FNPA Foreign Numbering Plan Area | |
| FOC Fiber Optic Communications | |
| FON Fiber Optics Network | |
| FR Flat Rate | |
| FRS Flexible Route Selection | |
| FSK Frequency Shift Keying | |
| FTG Final Trunk Group | |
| FTP File Transfer Protocol | |
| FTS Federal Telecommunications System | |
| FX Foreign eXchange | |
| GBS Group Bridging Service | |
| GCS Group Control System | |
| GEISCO General Electric Information Services COmpany | |
| GHZ GigaHertZ | |
| GID Group ID | |
| GND GrouND | |
| GOS Grade Of Service | |
| GP Group Processor | |
| GPIB General Purpose Interface Bus | |
| GRD GRounD | |
| GRP MOD GRouP MODulator | |
| GSA General Services Administration | |
| GSAT General telephone and electronics SATellite corporation | |
| GTC General Telephone Company | |
| GTE General Telephone Electronics | |
| GTT Global Title Transmission | |
| HCSDS High-Capacity Satellite Digital Service | |
| HCTDS High-Capacity Terrestrial Digital Service | |
| HDLC High-level Data Link Control | |
| HDTV High Definition TV | |
| HDX Half DupleX | |
| HEAP Home Energy Assistance Program | |
| HEHO High End Hop Off | |
| HIC Hybrid Integrated Circuit | |
| HNPA Home Numbering Plan Area | |
| HNS Hospitality Network Service | |
| HOBIC HOtel Billing Information Center | |
| HOBIS HOtel Billing Information System | |
| HP Hewlett-Packard | |
| HPO High Performance Option | |
| HSSDS High-Speed Switched Digital Service | |
| HU High Usage | |
| HUTG High Usage Trunk Group | |
| HZ HertZ | |
| I&M Installation & Maintenance | |
| I/O Input/Output | |
| IB Instruction Buffer | |
| IBN Integrated Business Network | |
| IC Independent Carrier | |
| IC Inter-exchange Carrier | |
| IC Inter-LATA Carrier | |
| ICAN Individual Circuit ANalysis | |
| ICC Interstate Commerce Commission | |
| ICD Interactive Call Distribution | |
| ICLID Individual Calling Line ID | |
| ICM Integrated Call Management | |
| ICSC Inter-LATA Customer Service Center | |
| IDDD International Direct Distance Dialing | |
| IDF Intermediate Distributing Frame | |
| IDS Internal Directory System | |
| IDVC Integrated Data/Voice Channel | |
| IEEE Institute of Electrical and Electronics Engineers | |
| IF Intermediate Frequency | |
| IFRPS Intercity Facility Relief Planning System | |
| IIN Integrated Information Network | |
| IM Interface Module | |
| IMAS Integrated Mass Announcement System | |
| IMM Input Message Manual | |
| IMT Inter-Machine Trunk | |
| IMTS Improved Mobile Telephone Service | |
| IN Intelligent Network | |
| INC InterNational Carrier | |
| INL Inter Node Link | |
| INN Inter Node Network | |
| INTELSAT INternational TELecommunications SATellite consortium | |
| INWATS INward Wide Area Telephone Service | |
| IO Inward Operator | |
| IOC Input/Output Controller | |
| IOCC International Overseas Completion Center | |
| IOP Input-Output Processor | |
| IOT Inter-Office Trunk | |
| IP Information Provider | |
| IPCS Interactive Problem Control System | |
| IPL Initial Program Load | |
| IPLAN Integrated PLanning And Analysis | |
| IPM Impulses Per Minute | |
| IPM Interruptions Per Minute | |
| IPX Integrated Packet eXchange | |
| IRC International Record Carrier | |
| IROR Internal Rate Of Return | |
| IS Interrupt Set | |
| ISC International Switching Center | |
| ISDN Integrated Service Digital Network | |
| ISLM Integrated Services Line Module | |
| ISLU Integrated Services Line Unit | |
| ISN Information Systems Network | |
| ISN Integrated Systems Network | |
| ISO International Organization for Standardization | |
| ISS Integrated Switching System | |
| ISSN Integrated Special Services Network | |
| ISUP Integrated Services User Part | |
| ITS Institute of Telecommunication Science | |
| ITSO Incoming Trunk Service Observation | |
| ITU International Telecommunications Union | |
| IVP Installation Verification Program | |
| IVTS International Video Teleconferencing Service | |
| IX Interactive eXecutive | |
| IXM IntereXchange Mileage | |
| JCL Job Control Language | |
| JES Job Entry System | |
| JIM Job Information Memorandum | |
| JMX Jumbogroup MultipleX | |
| JSN Junction Switch Number | |
| JSW Junctor SWitch | |
| K Kilobit | |
| KBPS KiloBits Per Second | |
| KDT Keyboard Display Terminal | |
| KFT KiloFeeT | |
| KHZ KiloHertZ | |
| KP Key Pulse | |
| KSR Keyboard Send-Receive | |
| KTS Key Telephone Set | |
| KTS Key Telephone System | |
| LAC Loop Assignment Center | |
| LADT Local Access Data Transport | |
| LAIS Local Automatic Intercept System | |
| LAMA Local Automatic Message Accounting | |
| LAN Local Area Network | |
| LAP Link Access Protocol | |
| LAPD Link Access Procedure on the D channel | |
| LASS Local Area Signaling Service | |
| LATA Local Access and Transport Area | |
| LATIS Loop Activity Tracking Information System | |
| LBO Line Buildout | |
| LBS Load Balance System | |
| LCAMOS Loop CAble Maintenance Operation System | |
| LCCIS Local Common Channel Interoffice Signaling | |
| LCCL Line Card CabLe | |
| LCCLN Line Card Cable Narrative | |
| LCDN Last Called Directory Number | |
| LCIE Lightguide Cable Interconnection Equipment | |
| LCLOC Line Card LOCation | |
| LCN Logical Channel Numbers | |
| LCR Least Cost Routing | |
| LCRMKR Line Card ReMarKs, Retained | |
| LCSE Line Card Service and Equipment | |
| LCSEN Line Card Service and Equipment Narrative | |
| LDMTS Long Distance Message Telecommunications Service | |
| LEAS LATA Equal Access System | |
| LEC Local Exchange Carrier | |
| LED Light-Emitting Diode | |
| LENCL Line Equipment Number CLass | |
| LF Line Finder | |
| LFACS Loop Facilties Assignment And Control System | |
| LIFO Last In, First Out | |
| LLN Line Link Network | |
| LMMS Local Message Metering System | |
| LMOS Loop Maintenace Operations System | |
| LOC Local Operating Company | |
| LOCAP LOw CAPacitance | |
| LOF Lock OFf-line | |
| LON Lock ON-line | |
| LPCDF Low Profile Combined Distributing Frame | |
| LRAP Long Route Analysis Program | |
| LRC Longitudal Redundancy Check | |
| LRS Line Repeater Station | |
| LRSS Long Range Switching Studies | |
| LSB Lower Side Band | |
| LSI Large-Scale Integrated circuitry | |
| LSRP Local Switching Replacement Planning system | |
| LSS Loop Switching System | |
| LSV Line Status Verifier | |
| LTAB Line Test Access Bus | |
| LTC Local Test Cabinet | |
| LTD Local Test Desk | |
| LTF Lightwave Terminating Frame | |
| LTF Line Trunk Frame | |
| LTG Line Trunk Group | |
| LTS Loss Test Set | |
| LXE Lightguide eXpress Entry | |
| M/W MicroWave | |
| MA Maintenance Administrator | |
| MACBS Multi-Access Cable Billing System | |
| MADN Multiple Access Directory Numbers | |
| MAN Metropolitan Area Network | |
| MAP Maintenance and Administration Position | |
| MAPSS Maintenance & Analysis Plan for Special Services | |
| MAR Microprogram Address Register | |
| MARC Market Analysis of Revenue and Customers system | |
| MAS MAin Store | |
| MAS Mass Announcement System | |
| MASB MAS Bus | |
| MASC MAS Controller | |
| MASM MAS Memory | |
| MATFAP Metropolitan Area Transmission Facility Analysys Program | |
| MBPS MegaBits Per Second | |
| MCIAS Multi-Channel Intelligent Announcement System | |
| MCC Master Control Center | |
| MCCS Mechanized Calling Card Service | |
| MCH Maintenance CHannel | |
| MCHB Maintenance CHannel Buffer | |
| MCI Microwave Communications Incorporated | |
| MCIAS Multi-Channel Intercept Announcement System | |
| MCN Metropolitan Campus Network | |
| MCS Meeting Communications Service | |
| MCTRAP Mechanized Customer Trouble Report Analysis Plan | |
| MDACS Modular Digital Access Control System | |
| MDC Marker Distributor Control | |
| MDC Meridian Digital Centrex | |
| MDF Main Distribution Frame | |
| MDU Marker Decoder Unit | |
| MDX Modular Digital eXchange | |
| MEC Mobile Equipment Console | |
| MELD Mechanized Engineering and Layout for Distributing frames | |
| MERS Most Economic Route Selection | |
| MET Multibutton Electronic Telephone | |
| MF Multi Frequency | |
| MFENET Magnetic Fusion Energy NETwork | |
| MFJ Modification of Final Judgement | |
| MFR Multi-Frequency Receivers | |
| MFT Metallic Facility Terminal | |
| MG MasterGroup | |
| MGT MasterGroup Translator | |
| MHS Message Handling System | |
| MHZ MegaHertZ | |
| MICE Modular Integrated Communications Environment | |
| MIN Mobile Identification Number | |
| MINX Multimedia Information Network eXchange | |
| MIR Micro-Instruction Register | |
| MIS Management Information System | |
| MISCF MISCellaneous Frame | |
| MITS Microcomputer Interactive Test System | |
| MLC MiniLine Card | |
| MLCD Multi-Line Call Detail | |
| MLT Mechanized Loop Testing | |
| MMC Minicomputer Maintenance Center | |
| MMGT MultiMasterGroup Translator | |
| MMOC Minicomputer Maintenance Operations Center | |
| MMS Main Memory Status | |
| MMS Memory Management System | |
| MMX Mastergroup MultipleX | |
| MODEM MOdulator-DEModulator | |
| MOG Minicomputer Operations Group | |
| MOS Metal Oxide Semiconductor | |
| MP Multi-Processor | |
| MPCH Main Parallel CHannel | |
| MPOW Multiple Purpose Operator Workstation | |
| MPPD Multi-Purpose Peripheral Device | |
| MRF Maintenance Reset Function | |
| MS Maintenance State | |
| MSC Media Stimulated Calling | |
| MTF Master Test Frame, | |
| MTP Message Transfer Part | |
| MTR Mechanized Time Reporting | |
| MTS Message Telecommunications Service | |
| MTS Message Telephone Service | |
| MTS Mobile Telephone Service | |
| MTSO Mobile Telephone Switching Office | |
| MTU Maintenance Termination Unit | |
| MTU Media Tech Unit | |
| MTX Mobile Telephone eXchange | |
| MU Message Unit | |
| MULDEM MULtiplexer-DEMultiplexer | |
| MUX MUltipleX | |
| MVP Multiline Variety Package | |
| MVS Multiple Virtual Storage | |
| MW MultiWink | |
| MXU MultipleXer Unit | |
| NA Next Address | |
| NAC Network Administration Center | |
| NAG Network Architecture Group | |
| NAM Number Assignment Module | |
| NAND Not-AND gate | |
| NAS Numerical and Atmospheric Sciences network | |
| NCC Network Control Center | |
| NCCF Network Communications Control Facility | |
| NCP Network Control Point | |
| NCS National Communications System | |
| NCTE Network Channel-Terminating Equipment | |
| NDCC Network Data Collection Center | |
| NEBS New Equipment-Building System | |
| NESAC National Electronic Switching Assistance Center | |
| NEXT Near-End X-Talk | |
| NHR Non Hierarchial Routing | |
| NI Network Interface | |
| NM Network Module | |
| NMC Network Management Center | |
| NNX Network Numbering eXchange | |
| NOC Network Operations Center | |
| NOCS Network Operations Center System | |
| NORGEN Network Operations Report GENerator | |
| NOTIS Network Operator Trouble Information System | |
| NPA No Power Alarm | |
| NPA Numbering Plan Area | |
| NPV Net Present Value | |
| NSA National Security Agency | |
| NSC Network Service Center | |
| NSCS Network Service Center System | |
| NSEC Network Switching Engineering Center | |
| NSFNET National Science Foundation NETwork | |
| NSPMP Network Switching Performance Measurement Plan | |
| NT Network Termination | |
| NT Northern Telecom | |
| NTEC Network Technical Equipment Center | |
| NTIA National Telecommunications and Information Agency | |
| NTS Network Technical Support | |
| NTS Network Test System | |
| NUA Network User Address | |
| NUI Network User Identification | |
| NYNEX New York, New England and the unknown (X) | |
| O-LTM Optical Line Terminating Multiplexer | |
| OASYS Office Automation SYStem | |
| OC Operator Centralization | |
| OCC Other Common Carrier | |
| OCE Other Common carrier channel Equipment | |
| OCU Office Channel Unit | |
| ODAC Operations Distribution Administration Center | |
| ODD Operator Distance Dialing | |
| ODDD Operator Direct Distance Dialing | |
| ODS Overhead Data Stream | |
| OFNPS Outstate Facility Network Planning System | |
| OGT OutGoing Trunk | |
| OMM Output Message Manual | |
| OMPF Operation and Maintenance Processor Frame | |
| ONAC Operations Network Administration Center | |
| ONAL Off Network Access Line | |
| ONI Operator Number Identification | |
| OP Outside Plant | |
| OPC Originating Point Codes | |
| OPEOS Outside Plant planning, Engineering & construction Operations Sys | |
| tem | |
| OPM Outside Plant Module | |
| OPS Off-Premises Station | |
| OPSM Outside Plant Subscriber Module | |
| OPX Off-Premises eXtension | |
| OR Originating Register | |
| ORB Office Repeater Bay | |
| ORM Optical Remote Module | |
| OS Operator Service | |
| OS OutState | |
| OSAC Operator Services Assistance Center | |
| OSC Operator Services Center | |
| OSC OSCillator | |
| OSDS Operating System for Distributed Switching | |
| OSI Open Systems Interconnection | |
| OSO Originating Signaling Office | |
| OSP OutSide Plant | |
| OSPS Operator Service Position System | |
| OSS Operator Service System | |
| OUTWATS OUTward Wide Area Telecommunications Service | |
| OW Over-Write | |
| P/AR Peak-to-Average Ratio | |
| PA Power Allarm | |
| PA Program Address | |
| PABX Private Automatic Branch eXchange | |
| PACE Program for Arrangement of Cables and Equipment | |
| PACT Prefix Access Code Translator | |
| PAD Packet Assembly/Disassembly | |
| PAM Pulse-Ampitude Modulation | |
| PAN Personal Account Number | |
| PANS Pretty Advanced New Stuff | |
| PAS Public Announcement Service | |
| PAT Power Alarm Test | |
| PAX Private Automatic eXchange | |
| PBC Peripheral Bus Computer | |
| PBC Processor Bus Controller | |
| PBD Pacific Bell Directory | |
| PBX Private Branch eXchange | |
| PC Primary Center | |
| PCDA Program Controlled Data Acquisition | |
| PCH Parallel CHannel | |
| PCM Pulse-Code Modulation | |
| PCO Peg Count and Overflow | |
| PCTV Program Controlled TransVerters | |
| PD Peripheral Decoder | |
| PDF Power Distribution Frame | |
| PDI Power and Data Interface | |
| PDN Public Data Network | |
| PDSP Peripheral Data Storage Processor | |
| PE Peripheral Equipment | |
| PECC Product Engineering Control Center | |
| PFPU Processor Frame Power Unit | |
| PH Parity High bit | |
| PIA Plug-In Administrator | |
| PIC Plastic-Insulated Cable | |
| PIC Primary Independent Carrier | |
| PICS Plug-in Inventory Control System (PICS/DCPR) | |
| PIN Personal Identification Number | |
| PIP Packet Interface Port | |
| PL Parity Low bit | |
| PM Peripheral Module | |
| PM Plant Management | |
| PMAC Peripheral Module Access Controller | |
| PMU Precision Measurement Unit | |
| PNB Pacific Northwest Bell | |
| PNPN Positive-Negative-Positive-Negative devices | |
| POB Periphal Order Buffer | |
| POF Programmable Operator Facility | |
| POP Point Of Presence | |
| POTS Plain Old Telephone Service | |
| PP Post Pay | |
| PPD Peripheral Pulse Distributor | |
| PPN Public Packet Switching | |
| PPS Product Performance Surveys | |
| PPS Public Packet Switching network | |
| PRCA Puerto Rico Communications Authority | |
| PREMIS PREMises Information System | |
| PRI Primary Rate Interface | |
| PROM Programmable Read-Only Memory | |
| PROMATS PROgrammable Magnetic Tape System | |
| PROTEL PRocedure Oriented Type Enforcing Language | |
| PRS Personal Response System | |
| PRTC Puerto Rico Telephone Company | |
| PS Program Store | |
| PSAP Public Safety Answering Point | |
| PSC Prime Service Contractor | |
| PSC Public Safety Calling system | |
| PSC Public Service Commission | |
| PSDC Public Switched Digital Capability | |
| PSE Packet Switch Exchange | |
| PSIU Packet Switch Interface Unit | |
| PSK Phase-Shift Keying | |
| PSM Packet Service Module | |
| PSM Position Switching Module | |
| PSN Packet Switched Network | |
| PSN Public Switched Network | |
| PSO Pending Service Order | |
| PSS Packet Switch Stream | |
| PSS Packet Switched Services | |
| PSTN Public Switched Telephone Network | |
| PSU Program Storage Unit | |
| PSW Program Status Word | |
| PT Program Timer | |
| PTAT Private Trans Atlantic Telecommunications | |
| PTT Postal Telephone and Telegraph | |
| PTW Primary Translation Word | |
| PUC Peripheral Unit Controller | |
| PUC Public Utilities Commission | |
| PVC Permanent Virtual Circuits | |
| PVN Private Virtual Network | |
| QAM Quadrature-Amplitude Modulation | |
| QAS Quasi-Associated Signaling | |
| QMP Quality Measurement Plan | |
| QRSS Quasi Random Signal Source | |
| QSS Quality Surveillance System | |
| R Ring | |
| R&R Rate & Route | |
| R&SE Research & Systems Engineering | |
| R/O Read/Only | |
| R/W Read Write | |
| R/WM Read/Write Memory | |
| RAM Random-Access Memory | |
| RAND Rural Area Network Design | |
| RAO Regional Accounting Office | |
| RAO Revenue Accounting Office | |
| RAR Return Address Register | |
| RASC Residence Account Service Center | |
| RBHC Regional Bell Holding Company | |
| RBOC Regional Bell Operating Company | |
| RBOR Request Basic Output Report | |
| RC Regional Center | |
| RC Resistance-Capacitance | |
| RC MAC Recent Change Memory Administration Center | |
| RCC Radio Common Carrier | |
| RCC Remote Cluster Controller | |
| RCC Reverse Command Channel | |
| RCF Remote Call Forwarding | |
| RCLDN Retrieval of Calling Line Directory Number | |
| RCM Remote Carrier Module | |
| RCSC Remote Spooling Communications Subsystem | |
| RCU Radio Channel Unit | |
| RCVR ReCeiVeR | |
| RDES Remote Data Entry System | |
| RDS Radio Digital System | |
| RDT Radio Digital Terminal | |
| REC Regional Engineering Center | |
| REM Remote Equipment Module | |
| REMOBS REMote OBservation System | |
| REN Ring Equivalence Number | |
| REXX REstructred eXtended eXecuter language | |
| RF Radio Frequency | |
| RID Remote Isolation Device | |
| RISLU Remote Integrated Services Line Unit | |
| RLCM Remote Line Concentrating Module | |
| RLT Remote Line Test | |
| RMAS Remote Memory Administration System | |
| RMR Remote Message Registers | |
| RMS Root-Mean-Square | |
| RN Reference Noise | |
| RNOC Regional Network Operations Center | |
| RO Receive Only | |
| ROB Remote Order Buffer | |
| ROC Regional Operating Company | |
| ROH Receiver Off Hook | |
| ROM Read-Only Memory | |
| ROTL Remote Office Test Line | |
| RQS Rate/Quote System | |
| RQSM Regional Quality Service Management | |
| RRO Reports Receiving Office | |
| RSA Repair Service Attendant | |
| RSB Repair Service Bureau | |
| RSC Remote Switching Center | |
| RSC Residence Service Center | |
| RSCS Remote Source Control System | |
| RSCS Remote Spooling Communications Subsystem | |
| RSLE Remote Subscriber Line Equipment | |
| RSLM Remote Subscriber Line Module | |
| RSM Remote Switching Module | |
| RSS Remote Switching System | |
| RSTS/E Resource System Time Sharing/Enhanced | |
| RSU Remote Switching Unit | |
| RTA Remote Trunking Arrangement | |
| RTL Resistor-Transistor Logic | |
| RTM Regional Telecommunications Management | |
| RTM Remote Test Module | |
| RTS Remote Testing System | |
| RTU Remote Trunking Unit | |
| RTU Right To Use | |
| RUM Remote User Multiplex | |
| RWC Remote Work Center | |
| RX Remote eXchange | |
| S Sleeve | |
| SAC Service Area Code | |
| SAC Service Area Computer | |
| SAC Special Area Code | |
| SAG Street Address Guide | |
| SAI Serving Area Interface | |
| SALI Standalone Automatic Location Identification | |
| SAMA Step by step Automatic Message Accounting | |
| SAR Store Address Register | |
| SARTS Switched Access Remote Test System | |
| SAT Special Access Termination | |
| SAT Supervisory Audio Tone | |
| SBMS Southwestern Bell Mobile Service | |
| SBS Skyline Business Systems | |
| SC Scanner Controller | |
| SC Sectional Center | |
| SCAT Stromberg-Carlson Assistance Team | |
| SCC Specialized Common Carrier | |
| SCC Switching Control Center | |
| SCCS Specialized Common Carrier Service | |
| SCCS Switching Control Center System | |
| SCF Selective Call Forwarding | |
| SCM Subscriber Carrier Module | |
| SCO Serving Central Office | |
| SCOT Stepper Central Office Tester | |
| SCOTS Surveillance & Control Of Transmissions System | |
| SCP Signal Control Point | |
| SCP Signal Conversion Point | |
| SCP System Control Program | |
| SCPC Signal Channel Per Carrier | |
| SCPD Supplementary Central Pulse Distributor | |
| SCU Selector Control Unit | |
| SCX Specialized Communications eXchange | |
| SD&D Specific Development & Design | |
| SDIS Switched Digital Integrated Service | |
| SDL Specification and Description Language | |
| SDLC Synchronous Data Link Control | |
| SDN Software-Defined Network | |
| SDOC Selective Dynamic Overload Controls | |
| SDP Service Delivery Point | |
| SDR Store Data Register | |
| SDS Switched Data Service | |
| SDS Synchronous Data Set | |
| SDSC Synchronous Data Set Controller | |
| SEAS Signaling Engineering and Administration System | |
| SEL SELector | |
| SES Service Evaluation System | |
| SF Single Frequency | |
| SFMC Satellite Facility Management Center | |
| SG SuperGroup | |
| SGML Standard Generic Markup Language | |
| SGMP Simple Gateway Management Protocol | |
| SI Status Indicator | |
| SIC Silicon Integrated Circuit | |
| SID System IDentification | |
| SIT Special Information Tone | |
| SLC Subscriber Loop Carrier | |
| SLE Screening Line Editor | |
| SLIC Subscriber Line Interface Circuit | |
| SLIM Subscriber Line Interface Module | |
| SM Switching Module | |
| SMAS Supplementary MAin Store | |
| SMAS Switched Maintenance Access System | |
| SMASF SMAS Frame | |
| SMASPU SMAS Power Unit | |
| SMDF Subscriber Main Distributing Frame | |
| SMDI Subscriber Message Desk Interface | |
| SMDR Station Message Detailed Recording | |
| SMG SuperMasterGroup | |
| SMS Service Management System | |
| SMSA Standard Metropolitan Statistical Area | |
| SMTP Simple Mail Transfer Protocol | |
| SNA System Network Architecture | |
| SNADS System Network Architecture Distribution Service | |
| SNET Southern New England Telephone | |
| SOAC Service Order Analysis Control | |
| SOC Service Oversight Center | |
| SOH Service Order History | |
| SONAR Service Order Negotiation And Retrieval | |
| SONDS Small Office Network Data System | |
| SP Signal Processor | |
| SP Signaling Point | |
| SPAN Space Physics Analysis Network | |
| SPAN System Performance ANalyzer | |
| SPC Southern Pacific Communications | |
| SPC Stored Program Control | |
| SPCS Stored Program Control Systems | |
| SPI Serial Peripheral Interface | |
| SPUC/DL Serial Peripheral Unit Controller/Data Link | |
| SQL/DS Structured Query Language/Data System | |
| SRA Selective Routing Arrangement | |
| SS Special Services | |
| SSAS Station Signaling and Announcement Subsystem | |
| SSB Single-SideBand | |
| SSBAM Single-SideBand Amplitude Modulation | |
| SSC Special Services Center | |
| SSCP Subsystem Services Control Point | |
| SSO Satellite Switching Office | |
| SSP Signal Switching Point | |
| SSP Sponsor Selective Pricing | |
| SSP System Status Panel | |
| SSPC SSP Controller | |
| SSPRU SSP Relay Unit | |
| SSTTSS Space-Space-Time-Time-Space-Space network | |
| ST STart | |
| STC Serving Test Center | |
| STC Switching Technical Center | |
| STD Subscriber Trunk Dialing | |
| STDM Statistical Time Division Multiplexing | |
| STP Signal Transfer Point | |
| STS Shared Tenant Service | |
| STS Space-Time-Space network | |
| SVC Switched Virtual Circuits | |
| SVS Switched Voice Service | |
| SWB SouthWestern Bell | |
| SX SimpleX signaling | |
| SXS Step by (X) Step | |
| SYC SYstem Control | |
| SYSGEN SYStem GENeration | |
| T Tip | |
| T1/OS T1 carrier OutState | |
| T1FE T1 carrier Front End | |
| TA Terminal Adaptor | |
| TA Transfer Allowed | |
| TAC Terminal Access Circuit | |
| TAP Telephone Assistance Plan | |
| TAS Telephone Answering Service | |
| TASC Technical Assistance Service Center | |
| TASC Telecommunications Alarm Surveillance and Control system | |
| TASI Time Assignment Speech Interpolation system | |
| TAT TransAtlantic Telephone | |
| TC Timing Counter | |
| TC Toll Center | |
| TCAP Transaction Capabilities Applications Port | |
| TCAS T-Carrier Administration System | |
| TCC Trunk Class Code | |
| TCG Test Call Generation | |
| TCM Time Compression Multiplexer | |
| TCM Trellis Coded Modulation | |
| TCR Transient Call Record | |
| TDAS Traffic Data Administration System | |
| TDC Tape Data Controller | |
| TDC Terrestrial Data Circuit | |
| TDD Telecommunications Device for Deaf | |
| TDM Time Division Multiplexing | |
| TE Terminal Equipment | |
| TE Transverse Electric | |
| TEHO Tail End Hop Off | |
| TELSAM TELephone Service Attitude Measurement | |
| TERM TERMinal | |
| TFLAP T-carrier Fault-Locating Applications Program | |
| TFS Trunk Forecasting System | |
| TGC Terminal Group Controller | |
| TGN Trunk Group Number | |
| TH Trouble History | |
| TIA Telephone Information Access | |
| TIRKS Trunk Integrated Record Keeping System | |
| TLM Trouble Locating Manual | |
| TLN Trunk Line Network | |
| TLP Transmission Level Point | |
| TLTP Trunk Line and Test Panel | |
| TM Transverse Magnetic | |
| TMDF Trunk Main Distributing Frame | |
| TMMS Telephone Message Management System | |
| TMR Transient Memory Record | |
| TMRS Traffic Measurement and Recording System | |
| TMRS Traffic Metering Remote System | |
| TMS Time-Multiplexed Switch | |
| TN Telephone Number | |
| TN Transaction Number | |
| TNDS Total Network Data System | |
| TNN Trunk Network Number | |
| TNOP Total Network Operation Plan | |
| TNPC Traffic Network Planning Center | |
| TOPS Timesharing OPerating System | |
| TOPS Traffic Operator Position System | |
| TP Toll Point | |
| TPMP Total network data system Performance Measurement Plan | |
| TR Test Register | |
| TR Transfer Register | |
| TREAT Trouble Report Evaluation Analysis Tool | |
| TRMTR TRamsMiTteR | |
| TRR Tip-Ring Reverse | |
| TSCPF Time Switch and Call Processor Frame | |
| TSCPF Time Switch and Central Processor Frame | |
| TSI Time Slot Interchanger | |
| TSO Time Sharing Option | |
| TSORT Transmission System Optimum Relief Tool | |
| TSP Test SuPervisor | |
| TSP Traffic Service Position | |
| TSPS Traffic Service Position System | |
| TSS Trunk Servicing System | |
| TSST Time-Space-Space-Time network | |
| TST Time-Space-Time network | |
| TST Traveling-Wave Tube | |
| TSTS Time-Space-Time-Space network | |
| TT Trunk Type | |
| TTC Terminating Toll Center | |
| TTL Transistor-Transistor Logic | |
| TTP Trunk Test Panel | |
| TTS Trunk Time Switch | |
| TTTN Tandem Tie Trunk Network | |
| TTY TeleTYpewriter | |
| TTYC TTY Controller | |
| TUR Traffic Usage Recording | |
| TUR Trunk Utilization Report | |
| TWX TeletypeWriter eXchange | |
| UCD Uniform Call Distribution | |
| UIC User Identification Code | |
| UID User ID | |
| UITP Universal Information Transport Plan | |
| UNISTAR UNIversal Single call Telecommunications Answering & Repair | |
| USB Upper Side Band | |
| USITA United States Independent Telephone Association | |
| USO Universal Service Order | |
| USOC Universal Service Order Code | |
| USP Universal Sampling Plan | |
| UUCICO Unix to Unix Copy Incoming Copy Outgoing | |
| UUCP Unix to Unix Copy Program | |
| VAN Value Added Network | |
| VC Virtual Circuit | |
| VCS Virtual Circuit System | |
| VF Voice Frequency | |
| VFY VeriFY | |
| VGF Voice Grade Facility | |
| VHF Very High Frequency | |
| VINES VIrtual NEtwork Software | |
| VIU Voiceband Interface Unit | |
| VLSI Very Large-Scale Integrated circuitry | |
| VM/SP Virtual Machine/System Product | |
| VMCF Virtual Machine Communications Facility | |
| VMR Volt-Meter Reverse | |
| VMRS Voice Message Relay System | |
| VMS Virtual Memory operating System | |
| VMS Voice Mail System | |
| VMS Voice Management System | |
| VNF Virtual Network Feature | |
| VNL Via Net Loss plan | |
| VNLF Via Net Loss Factor | |
| VODAS Voice Over Data Access Station | |
| VPN Virtual Private Network | |
| VRS Voice Response System | |
| VSAM Virtual Storage Access Method | |
| VSAT Very Small Aperature Terminal | |
| VSB Vestigial SideBand modulation | |
| VSE Virtual Storage Extended | |
| VSR Voice Storage and Retrieval | |
| VSS Voice Storage System | |
| VSSP Voice Switch Signaling Point | |
| VTAM Virtual Telecommunications Access Method | |
| VTI Virtual Terminal Interface | |
| VTOC Volume Table Of Contents | |
| VTS Video Teleconferencing System | |
| WAN Wide Area Network | |
| WATS Wide Area Telephone Service | |
| WC Wire Center | |
| WCPC Wire Center Planning Center | |
| WDT Watch Dog Timer | |
| WM Work Manager | |
| XB X-Bar | |
| XBAR X-BAR | |
| XBT X-Bar Tandem | |
| XFE X-Front End | |
| XMS eXtended Multiprocessor operating System | |
| ^*^ | |
| ========================================================================= | |