    Received: from nuacc.acns.nwu.edu by delta.eecs.nwu.edu id aa25802;
              22 Nov 89 1:24 CST
    Received: from UMCVMB.BITNET by nuacc.acns.nwu.edu; Wed, 22 Nov 89 01:21 CST
    Received: by UMCVMB (Mailer R2.04) id 5039; Wed, 22 Nov 89 01:14:37 CST
    Date: Wed, 22 Nov 89 01:14:16 CST
    From: Randy Tischler <C488869@umcvmb.bitnet>
    To: ptownson@eecs.nwu.edu
    Message-ID:  <8911220124.aa25802@delta.eecs.nwu.edu>
    Resent-Date:  Wed, 22 Nov 89 1:29:12 CST
    Resent-From:  ptownson@eecs.nwu.edu
    Resent-To:  telecom@eecs.nwu.edu

                                   ==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
    CDT  Call Data Transmitter
    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 Gate'ay Management Protocol
    SI  Status Indicator
    SIC  Silicon Integrated Circuit
    SID  Sy>tem IDentification
    SIT  Special Informaöion Tone
    SLC  Subscriber Loop Carrier
    SLE  Ûcreening 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  SMA[°FraeE
    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

                                         ^*^