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                                _  _        _______



                               | \/ |      / _____/



                               |_||_|etal / /hop



                               __________/ /



                              /___________/



                                 (314)432-0756







                               Proudly Presents







                     The MCI Telecommunications Glossary







                              Part II: Acronyms







                     Typed and edited by Knight Lightning











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                                    - A -











ACD      Automatic Call Distributor



AIOD     Automatic Identification of Outward Dialing



ANI      Automatic Number Identification



ARS      Automatic Route Selection



ASCII    American Standard Code for Information Interchange



ATB      All Trunks Busy



AVD      Alternate Voice Data







                                     - B -







BOC      Bell Operating Company



BSOC     Bell System Operating Company



BPS      Bits Per Second







                                    - C -







CCIS     Common Channel Interoffice Signaling



CCSA     Common Control Switching Arrangement



CO       Central Office



COAM     Customer Owned And Maintained



COS      Class Of Service



CPE      Customer Premise Equipment



CPH      Cost Per Hour



CPM      Cost Per Minute



CPU      Central Processing Unit



CRT      Cathode Ray Tube



CU       Control Unit







                                    - D -







dB       Decibel



DCTS     Dimension Custom Telephone Service



DDD      Direct Distance Dialing



DID      Direct Inward Dialing



DM       Delta Modulation



DTMF     Dual Tone Multi-Frequency







                                    - E -







EDP      Electronic Data Processing



EEHO     Either End Hop Off



EKTS     Electronic Key Telephone Set



EML      Expected Measured Loss



ENFIA    Exchange Network Facilities for Interstate Access



EPROM    Erasable Programmable Read Only Memory



EPSCS    Enhanced Private Switched Communication Service



ERL      Echo Return Loss



ETN      Electronic Tandem Network







                                    - F -







FCC      Federal Communications Commission



FDM      Frequency Division Multiplex



FX       Foreign Exchange







                                    - H -







HEHO     Head End Hop Off



Hz       Hertz







                                    - I -







IMT      Inter-Machine Trunk



IOT      Inter-Office Trunk



IRC      International Record Carrier







                                    - L -







LAN      Local Area Network



LATA     Local Access and Transport Area



LCR      Least Cost Routing







                                    - M -







MDF      Main Distribution Frame



MERS     Most Economical Route Selection



MG       Mastergroup



MOS      Metal-Oxide Semiconductor



MTS      Message Telephone Service



MU       Message Unit



M/W      Microwave







                                    - N -







NPA      Numbering Plan Area



NNX      Numbering Network Exchange







                                    - O -







OCC      Other Common Carrier



ONAL     Off Network Access Line



OPX      Off-Premise Extension







                                    - P -







PABX     Private Automatic Branch Exchange



PBX      Private Branch Exchange



PCM      Pulse Code Modulation



POTS     Plain Old Telephone Service



PROM     Programmable Read-Only Memory



PSC      Public Service Commission



PSN      Public Switched Network



PTT      Postal Telephone and Telegraph



PUC      Public Utility Commision







                                    - R -







RAM      Random Access Memory



RCC      Radio Common Carrier



ROM      Read-Only Memory







                                    - S -







SCC      Specialized Common Carrier



SG       Supergroup



SMDR     Station Message Detail Recording



SMG      Supermastergroup



SPC      Stored Program Control



SSB      Single Sideband Radio







                                    - T -







TEHO     Tail End Hop Off



TDM      Time Division Multiplex



TMRS     Traffic Measurement and Recording system



TSPS     Traffic Service Position System



TT       Trunk Type



TTTN     Tandem Tie Trunk network



TUR      Trunk Utilization Report



TWX      Teletypewriter Exchange Service







                                    - U -







UCD      Uniform Call Distributor



USOC     Uniform Service Order Code







                                    - V -







VANS     Value - Added Network Service



VP       Voice Frequency



VGF      Voice Grade Facility



VNL      Via Net Loss







                                    - W -







WATS     Wide Area Telecommunications Service







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This concludes The MCI Telecommunications Glossary. Look for more G-philes on



MCI by Knight Lightning coming soon to Metal Shop.







                     This has been a 2600 Club production







                             Thanx to Taran King

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