| ==Phrack Inc.== |
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| Volume Two, Issue 20, File 11 of 12 |
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| Metal Shop Private's -- Acronyms |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 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 |
|
|
|
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| ^*^ |
| ========================================================================= |
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|
