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Acronym Dictionary and Glossary

CSR ACRONYM DEFINITIONS

CSR Acronym Definitions A-D http://www.csrstds.com/acro-a-d.htm.CSR Acronym Defintions E-H http://www.csrstds.com/acro-e-h.htm.CSR Acronym Definitions I-M http://www.csrstds.com/acro-i-m.htm.

CSR Acronym Definitions N-R http://www.csrstds.com/acro-n-r.htm.

Acronym Definitions last updated November 26, 2001. I f you have changes or corrections, please e-mailthem to ebaskin@csrstds.com. Thank you.Communications Standards Reviewe-mail: ebaskin@csrstds.com

SSEC Acronyms ListSSEC Acronyms List http://www.ssec.wisc.edu/pubs/acronyms.htm.Updated 17 December 2001 by the SSEC Webmaster.

(current December 2001)

ANSI ASC X12N - Acronym DictionaryOCTOBER 1997ASC X12N ACRONYM DICTIONARY http://www.wpc-edi.com/AcronymDictionary/Index.htmlASC X12N ACRONYM DICTIONARY http://www.wpc-edi.com/AcronymDictionary/Dictionary.html

Acronym Dictionaryhttp://www.wpc-edi.com/AcronymDictionary/Dictionary.htm.

DictionaryA List of Xcellweb Features plus a collection of Internet expressions

Xcellweb Services/Dictionary http://www.xcellweb.com/html/dictionary.htm.Sales@xcellweb.com(503) 968-4307

MAD The MIPS Acronym DictionaryDon't get even, get MAD!webmaster@mips.as.arizona.eduSunday, October 28, 2001

Leviton ManufacturingCo., Inc.

Copyright 1998www.levitontelcom.com e-mail: info@levitontelcom.comNewtons Telecom Dictionary

BABEL: A LISTING OF COMPUTER ORIENTED ABBREVIATIONS AND ACRONYMSDate Updated: 10/20/93

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Version 93CCopyright (c) 1989-1993 Irving Kind All Rights Reserved

Irving Kind Internet: ikind@mcimail.comc/o K &D MCIMail: 545-3562One Church LaneBaltimore, MD 21208Sep 1993 version = BABEL93C Sep 1994 version = BABEL94C

CSGNetwork's Online Computer, Telephony & Electronics ReferenceComputer Support Group & CSGNetwork.Com OnlineComputer, Telephony and Electronics Glossary and Dictionary wysiwyg://79/http://www.csgnetwork.com/glossaryp.htm.This Page Last Downloaded or Refreshed: Thursday, January 01, 1970 00:00:00

AFRL Acronym Dictionaryhttp://www.afrl.af.mil/dictionary.htm.

For questions regarding information on this page pleasecontact webmaster@afrl.af.mil, AFRL/XPTC, 937-255-0785, DSN 785-0785AFRL Acronym Dictionary http://www.afrl.af.mil/dictionary.htm

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CSR ACRONYM DEFINITIONS

1-1SDoC One Standard-One Test, Suppliers Declaration of Conformity2B1Q 2 Binary 1 Quaternary3GPP Third Generation Partnership Project (ETSI)3WC Three Way Call

-A-A/D Analog to DigitalA&T Architecture & Transport (DSL Forum Committee, formerly ATM)A/TT Analog Tie Trunk (TIA-646-B)AAA Authentication, Authorization and AccountingAAC Advanced Audio CodingAACCH Auxiliary Analog Control ChannelAAL ATM Adaptation LayerAAL(D) Analog PSTN Access Line (Analog PBX Interface, TIA-646-B)

AAL5-CU ATM Adaptation Layer 5 Composite UserAAP Alternative Approval ProceduresAASO Advanced Audio Server Override (package)AASS Advanced Audio Server Set (package)AAU Advanced Audio PackageAAV Authentication Algorithm VersionABAC Aggregate Bearer Admission ControlAbC Approval by CorrespondenceABM Aggregate Bearer MeasurementABNF Augmented Backus-Naur FormABR Average Bit Rate

ABT Adaptive Block TransformAC Advisory CircularAC Alternating CurrentAC Authentication CenterAC Auto Configuration (DSL Forum)AC Automatic CallbackACA Adaptive Channel AllocationACBO Automatic Cross Band OperationACC Analog Control ChannelACCH Associated Control ChannelACD Automatic Call Distribution

ACE Advanced Coding EfficiencyACELP Adaptive CELPACF Authentication Control FunctionACG Automatic Code GappingACIL Association of Independent Scientific, Engineering and Testing FirmsACK AcknowledgmentACKS AcknowledgmentsACM Address Complete MessageACOS IEC Advisory Committee on SafetyACR Absolute Category RatingACR Alternate Carrier RoutingACR Anonymous Call RejectionACRE Authorization and Call Routing EquipmentACS Automatic Configuration Service

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ACSB Amplitude Companded Single Side BandACSE Association Control Service ElementACT ActivationACTA Administrative Council for Terminal Attachment (T1 and TIA)ACTE Approvals Committee for Terminal EquipmentACTS Advanced Communications Technology SatelliteAD Administrative DomainADA Americans with Disabilities Act

ADAAG ADA Accessibility GuidelinesAD-BES Administrative Back-End ServicesADC Analog to Digital ConverterADDS Application Data Delivery ServiceADHAG Ad Hoc Authentication Group (TR-45.2)ADI Analog Devices Inc.ADL ADSL without underlying POTS or ISDNADL All Digital LoopADL Automatic Determination of LocationADLC Asynchronous Data Link ControlADLG Automatic Determination of Location and Guidance

ADLNB Association of Designated Laboratories and Notified Bodies (European)ADP Answer Detection PatternADPCM Adaptive Differential PCMADS Asynchronous DataADSI Analog Display Services Interface (Bellcore)ADSL Asymmetric Digital Subscriber Loop (Line)ADSLF ADSL ForumADSL-R Asymmetric Digital Subscriber Loop (Remote)ADT Asynchronous Data TeleserviceAEC Acoustic Echo ControllerAECE Acoustic Echo Control Equipment

AES Advanced Encryption Standard-RijndaelAFE Analog Front EndAFNOR Association francaise de normalisation (French Standardization)AG Access GrantAGC Audiographics ConferencingAGC Automatic Gain ControlAGCH Access Grant ChannelAGNI Advisory Group for Network IssuesAHAG Ad Hoc Authentication Group (TR-45)AHES Ad Hoc Emergency Services (TR-45.2)AHG Ad Hoc GroupaHIT! TIPIA merger into IMTCAHMMG Ad Hoc Microcell/Microsystems GuidelinesAHPAI Ad Hoc PCS Air Interface Joint GroupAHSOG Ad Hoc on Self Organization GroupAHWG Ad Hoc Working GroupAI Air InterfaceAI Answer Indicator (V.8)AIC Advanced Intra CodingAIG Administrators Interest GroupAIG Authentication Implementation Guide

AIIM Association for Information and Image ManagementAIN Advanced Intelligent NetworkAINI ATM Inter Network Interface

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AIS Alarm Indication SignalAIV Alternative Inter VLCa.k.a. Also Known AsAL Answer ListAL1 H.223 Adaption Layer 1AL-PDU Answer List - Protocol Data UnitAL-SDU Answer List - Service Data UnitALC Automatic Level Control

ALCE Automatic Level Control EquipmentALE Automatic Link Establishment RadiosALF Application Level FramingALI Automatic Location IdentificationALIT Automatic Line Insulation TestALT Automatic Link TransferALU Arithmetic Logic UnitAM Amplitude ModulationAM Assignment MessageAMA Adaptive Motion AccuracyAMA/CDR Automatic Message Accounting/Call Detail Recording

AMD AmendmentAMF Authentication Management FunctionAMPS Advanced Mobile Phone ServiceAMR Adaptive MultiRateAMR-WB Adaptive Multi-Rate WidebandAN Access NetworkAN Access NodeAN Advisory NoteANAI Access Network Architecture and InterfacesANATEL Agencia Nacional de Telecomunicacoes (Brazil)ANF Additional Network Feature

ANF-CMN Common Information Additional Network Feature (H.450.12)ANFP Access Network Frequency PlanANI Automatic Number IdentificationANOVA Analysis of Variance ProcedureANS Answer ToneANSam Answer Tone, amplitude modulated (V.8)ANSI American National Standards InstituteANT Access Network Transport (Q1/15)AOC Advice of ChangeAOC Advice of ChargeAOC ADSL Overhead ChannelAOC-D Advice Of Charge during a callAOC-E Advice Of Charge at the End of a callAOD Audio on DemandAP Advanced PredictionAP Application ProtocolsAPCM Analog PCM ModemAPCO Associated Public Safety Communications Officers, Inc.APDU Application Protocol Data UnitAPE Application Protocols EntitiesAPEC Asian Pacific Economic Cooperation

API Application Programming InterfaceAPIC APCO Project 25 Interface CommitteeAPLAC Asian Pacific Laboratory Accreditation Cooperation

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APON ATM PONAPP Application MarkerAPS Asynchronous Protocol SpecificationAR Adaptive Reception ControlAR Auto-RegressiveAR Automatic RecallARC Adaptive Reception ControlARC Alarm Reporting Control

ARCH Access Response ChannelARDB Administrative Reference DataBaseARF Audio Resource FunctionARIB Association of Radio Industries and Businesses (accredited standards setting body in Japan)ARJ Admission RejectARLP Acoustic Reference Level PlanARM Application Resource ManagerARQ Automatic Repeat RequestASAP As Soon As PossibleASCII American Standard Code for Information InterchangeASE Applications Service Element

ASIC Application Specific Integrated CircuitASID Access, Searching and Indexing of DirectoriesASL Active Speech LevelASN Abstract Symbol NotationASO Arbitrary Slice OrderingASOG Access Service Ordering GuidelinesASP Application Service ProviderASR Automatic Speech RecognitionASTM formerly American Society of Testing and MeasurementASVD Analog SVDAT Access and Terminals (ETSI TC)

AT Asynchronous TerminalATA Analog Terminal and Access ProjectATa Analog Working Group (ETSI TC AT)AT-A ETSI Access and Terminals Analog Working GroupATAAB Analog Technical Ad hoc Advisory BoardATAc ATA's Conventional Technology WGATAe ATA's Enhanced Technology WGATBCB Architectural and Transportation Barriers Compliance BoardATC Analog Traffic ChannelAT-D ETSI Access and Terminals Digital Working GroupATd Digital Working Group (TC AT)ATf Features Working Group (TC AT)ATF Administrative Task ForceAT-F ETSI Access and Terminals Features Working GroupATG Access Transport Group (DSL Forum)ATIA Australian Telecommunications Industry AssociationATIS Alliance for Telecommunications Industry SolutionsATM Asynchronous Transfer ModeATMF ATM ForumATMOVE Adaptive-Template MovementATM-Utopia Universal Test and Operations Physical Layer Interface for ATM

ATO Analog Tandem Office (TIA-646-B)ATS Abstract Test SuiteATS Assigned Time Slot

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ATV Advanced TelevisionAuF Authentication FunctionAV AudioVisualAVC Audio Visual CodingAVC Audiovisual ConferencingAVD Alternating Voice DataAVI Interactive Audiovisual ServicesAVIS Audio Visual Information Systems

AVMMS AudioVisual and MultiMedia ServicesAVT Audio/Visual TransportAWG American Wire GaugeAWGN Additive White Gaussian NoiseAWI Alert With Info

-B-B Bi-directionally predictedB2B Business-to-BusinessB2C Business-to-ConsumerB2G Business-to-Government

B&G Bits&Gains (Q4/15)B&W Black and WhiteBA Basic Access (ISDN)BAM Biconic ConnectorBAPT Bundesamt fur Post und TelekommunikationBARAS ETSI SAGE standard encryption algorithm for audiovisual servicesBAS Bit rate Allocation SignalBAU Base Audio PackageBB Bandwidth BrokerBBN Bulk Billing NumberBBS Bulletin Board System

BC Basic CallBC Bearer ChannelBCC Basic Control ChannelBCCA Board Committee on Conformity AssessmentBCCH Broadcast Control ChannelBCD Binary Coded DecimalBCDF Broadband Content Delivery ForumBCF Backward Control FieldBCF Bearer Control FunctionBCH Bose, Chaudhuri, and HocquenghamBCM Back Channel MessageBCTP Basic Call Transfer Protocol (SG11)BD-PSNR Bjntegaard delta PSNRBDS Blank Detail SpecificationBE Border ElementBEM Big Emerging MarketsBER Bit Error RateBERT Bit Error Rate TestBES Back-End ServicesBEST Back-End Service Transaction(B)FER Burst Frame Error Rate

BF Bearer FunctionBFI Bad Frame IndicatorBFOC Bayonet Fiber Optic Connector

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BFT Binary File TransferBGN Background Noise ConditionsB-HLI Broadband High Layer InformationBICC Bearer Independent Call ControlBICSI Building Industry Consulting Services InternationalBID Billing ID NumbersBINTERMS Basic Interoperability for Terminals for Telematic ServicesB-ISDN Broadband ISDN

B-ISUP Broadband ISDN User PartBITB Boulder Industry Test BedBLER Block Error RatesBLERf Error Free Block RateBLES Broadband Loop Emulation ServiceB-LLI Broadband Lower Layer InformationBME Block based Motion EstimationBMI Base Station, Mobile Switching Center, and Interworking FunctionBMSC Base Station Manufacturer CodeBNC ID Backbone Network Connection IdentifierBNF Backus-Naur Form

B-NT Broadband Network TerminationBNT Binary File TransferBNTF Bi-National Task ForceBNTG Bi-National Task GroupBNWG Bi-National Working GroupBO Business OfficeBOF Birds of a FeatherBoD Board of DirectorsBOMA Building Owners & Managers AssociationBONDING Bandwidth On Demand Interest Group (TR-41)BOS Business Object Summit

BPI+ Baseline Privacy Interface PlusB-PISN Broadband PISNBPON Broadband Passive Optical NetworkBPTC Block-Product-Turbo-CodesB-QSIG Broadband QSIGBRA Basic Rate AccessBRAN Broadband Radio Access Networks (ETSI TC)BRAS Broadband Remote Access ServerBRI Basic Rate InterfaceBRKACK Break Acknowledge frame (V.42)BRM Bit Repetition MessageBRQ Bandwidth RequestBS Base StationBSC Base Station ControllerBSC Binary Symmetric ChannelsBSMAP Base Station Management Application PartBSMC Base Station Manufacturer CodeBSMI Bureau of Standards, Metrology and InspectionB-SMS Broadcasts Short Message ServiceBSN Broadband Service Node (Nortel)BSR Board of Standards Review (ANSI)

BSS Base Station SystemBSS Broadcasting-Satellite ServiceBST Broadcast SMS Teleservice

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BT British Telecom (United Kingdom PTT)BTA Basic Trading AreaBTC Business Telecommunications Committee (ETSI)BTM Basic Transfer ModeBTS Base Transceiver SystemB-UNI Broadband User Network InterfaceB-VOP Bidirectional Video Object PlanesB/W Black and White

BWC Bandwidth ControlBWS Building Wiring Standard

-C-C&I Commands and IndicationsC&S Control and Signaling (ATM Forum Working Group)CA Channel AggregationCA Communication Application (T.611)CA Conformity AssessmentCAB Conformity Assessment BodyCABA North America's Home and Building Automation Association

CABAC Context-based Adaptive Binary Arithmetic CodingCAC Carrier Access CodeCAC Connection Admission ControlCAD Computer Aided DesignCAGJES Canadian Advisory Group on Joint Electrical Safety CommitteeCAI Common Air InterfaceCAL Common Application LanguageCALEA Communications Assistance for Law Enforcement ActCAMA Centralized Automatic Message AccountingCANACINTRA Camara Nacional de la Industria de Transformacion (Mexico)CANIECE Camara Nacional de la Industria Electronica Y de Communicaciones Electricas (Mexico)

CAP Carrier-less Amplitude modulation Phase modulationCAPI Common APICAPCS Cellular Auxiliary Personal Communications ServiceCARE Carrier Access Records ExchangeCAS Channel Associated SignalingCAS Customer Alert SignalCASCO Committee on Conformity Assessment (ISO)CASE Conformity Assessment System Evaluation (NIST)CASS Common Air Satellite StructureCAT Cellular Action Team (ECSP committee)CATS Consortium for Audiographics Teleconferencing StandardsCATV Cable TelevisionCAVE Cellular Authentication and Voice Encryption AlgorithmCAWG Conformity Assessment Working Group (Trilateral)CB Call Barring (TIA TR-34)CB Certification BodyCB Citizen BandCBC Call Bearer ControlCBC Cipher Block ChainingCBEMA Computing Business Equipment Manufacturers Association (see ITI)CBP Coded Block Pattern (H.261)

CBPCM Coded Block Pattern - ChrominanceCBPC Coded Block Pattern for ChrominanceCBPY Coded Block Pattern for Luminance

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CBR Constant Bit RateCC Call ControlCC Common CarrierCC Communication Capability fieldCC Conference CallCC Continuity Check (Rec. I.610)CC Control ChannelCCA Common Cryptographic Algorithm

CCB Common Carrier BureauCCBS Completion of Calls to Busy SubscribersCCIR Comite consultatif international des radiocommunicationsCCITT Comite consultatif international telegraphique et telephoniqueCCM Call Connection ManagementCCR Call Connect ReliabilityCCR Comparison Category RatingCCS Common Channel SignalingCCSN Common Channel Signaling NetworkCCSRL Control Channel Segmentation and Reassembly LayerCCT Channel Check Test

CCT Consultative Committee - Telecommunications (Trilateral)CD Committee DraftCD Communication DeviceCD-ROM Compact Disk-Read Only MemoryCDCP Call Detail Collect PointCDG CDMA Development GroupCDGP Call Detail Generation PointCDH Cooperative Document HandlingCDIS Call Detail Information SourceCDL Coded Digital control channel LocatorCDMA Code Division Multiple Access

CDN Content Distribution NetworkCDPD Cellular Digital Packet DataCDR Call Detail RecordingCDRP Call Detail Rating PointCDS Caller Display SignalingCDTAC FCC Consumer/Disability Telecommunications Advisory CommitteeCDV Committee Draft for Vote, IECCE Capabilities ExchangeCE Core ExperimentCEASD Common ETSI Approach to Standards DevelopmentCeBIT Trade show in Hannover, GermanyCEBus Consumer Electronics BusCEC Canadian Electric CodeCEC European Committee for StandardizationCED Called Station Identification (T.30)CEG Card Expert Group (ETSI)CEG Integrated Circuit Card Expert GroupCELP Code Excited Linear PredictionCEN Commission Europeenne de Normalisation (European Standards Committee)CENELEC Commission Europeenne de Normalisation Electrotechnique (European ElectrotechnicalStandards Committee)

CEOC Clear Embedded Operations ChannelCEPT Conference of European PTTsCER Cell Error Ratio

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CEXT Central Office End CrosstalkCESID Caller Emergency Station IdentificationCF Call ForwardingCF Center FrequenciesCF Communication FunctionsCFA Carrier Failure Alarms (s)CFBL Call Forward Busy Line/ Don't AnswerCFI Calling Feature Indicator

CFP Computer Fax ProtocolCFP Cypher FeedbackCFR Code of Federal RegulationsCFR Confirmation to ReceiveCFU Call Forwarding - UnconditionalCG Correspondence GroupCGI Control Grid InterpolationCH Compare HDLCCHAP Challenge Handshake Authentication ProtocolCHASE A class of algorithms for decoding block codes, after D. ChaseCHS Candidate Harmonized Standard

CI Call Indicator (V.8)CI Calling IdentityCI Characteristic ImpedanceCI Count IndicatorCI Customer InstallationCI Customer InterfaceC/I Carrier to Interference RatioCIA Calling subscriber Internet AddressCIAJ Communications Industry Association of JapanCIB Configuration Information BaseCIC Circuit Identifier Code

CICES Canadian Interference Causing Equipment StandardCID Caller IdentificationCIDCW Calling Identity Delivery on Call WaitingCIELAB a device-independent color spaceCIF Common Intermediate FormatCIG Calling Subscriber IdentificationCILC Canadian Interconnection Liaison CommitteeCIM Common Information ModelCIP Component-Independent PaletteCIR Carrier to Interference RatioCISC CRTC Interconnection Steering CommitteeCISPR International Special Committee on Radio InterferenceCISPR/I Subcommittee of CISPR dealing with EMC of information technology, multimediaequipment, and receiversCIT Charge-Rate Indication TeleserviceCITEL Comision Internanericana de TelecomunicacionesCJ CM terminatorCL Capabilities Select (see CR)CLAD Cell Assembly/DisassemblyCLASS Bellcore service mark for signaling features such as Caller IDCLEC Competitive Local Exchange Carriers

CLEI Common Language Equipment IdentifiactionCLI Calling Line IdentificationCLID Calling Line Identity

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CLIP Calling Line Identification PresentationCLIP Calling Line ID ParameterCLLI Common Language Location Identifier (Telcordia)CLNP Connectionless Network ProtocolCLR Capabilities List RequestCLR Cell Loss RatioCLR Circuit Layout RecordCM Cable Modem

CM Call ManagerCM Call MenuCM Channel ManagementCM Common ModeCM Connection ManagementCMB CRC Message Block (TIA-464-C)CMC Common Mail CallCMC Common Messaging CallCME Circuit Multiplication EquipmentCME Communications Management EntityCMI Controlled Mode Idle

CMIP Common Management Information ProtocolCMIS Common Management Information ServicesCMISE Common Management Information Service ElementCMMR Common Mode RejectionCMMRD Cellular Microcell/Microsystem Requirements DocumentCMN Common informationCMODES Confidentiality ModesCMOS Comparison Mean Opinion ScoreCMOS Complimentary Metal Oxide SemiconductorCMRS Commercial Mobile Radio Services (U.S.)CMS Call Management Server

CMS Call Management SignalingCMS Circuit Multiplication SystemCMT Cellular Messaging TeleserviceCMTSD Cellular Mobile Telephone Service DescriptionsCMY Cyan, Magenta, YellowCMYK Cyan, Magenta, Yellow, BlackCN Corporate NetworkCNAD Calling Name DeliveryCNAP Calling Name PresentationCNAR Calling Name RestrictionCNG Calling Tone (T.30)CNG Comfort Noise GeneratorCNI Calling Number IdentificationCNI Comfort Noise InsertionCNID Calling Number IdentificationCNIP Calling Number Identification PresentationCNIP Calling Name Identity PresentationCNIR Calling Number Identification RestrictionCNP Connection Negotiation ProtocolCNR Carrier to Noise RatioCNRP Common Name Resolution Protocol

CO Central OfficeCOFETEL Comision Federal de Telecomunicaciones de MexicoCoIP Conferencing over IP (IMTC Activity Group)

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COMM comm.drv for Microsoft WindowsCONNEG Content Negotiations (IETF)COO Cell of OriginCOPEE Council on Office Products Energy EfficiencyCOPS Common Open Policy ServiceCORBA Common Object Request Broker ArchitectureCORD Cibernet On-line Roaming DatabaseCOS Corporation for Open Systems

COS-OST Corporation for Open Systems Executive Industry GroupCOSP Customer Owned Outside PlantCOST Co-Operation in the field of Science and Technology researchCOTS Commercial Off-The-ShelfCP Communications ProtocolCP Continuous Presence (H.243)CP Customer PremisesCP Cyclical PrefixCPA Combined Paging/AccessCPAN Customer Premises Area NetworkCPAP Customer Premises Access Profile

CPCS Common Part Convergence SublayerCPE Customer Premise EquipmentCPEV City Pair Polyethylene PVCCPF Compatible Protocol FieldCPH Call Party HandlingCP-IWF Customer Premises - InterWorking Function (ATM Forum)CPL Call Processing LanguageCPM Continuous Presence MultipointCPN Calling Party NumberCPN Customer Premise NetworkCPS Common Part Sublayer (ATMF)

CPSII Communications Protocol Stack Independent InterfaceCPT Cellular Paging TeleserviceCPU Central Processing UnitCQ CAS SignalCQ Communication QualityCQPSK Compatible Differential Offset Quadrature Phase Shift Keying (Digital Modulation)CR Capabilities Request (see CL)CRe Capabilities Request sent by autoanswering station at call initiationCRC Cyclic Redundancy CodeCRFP Cordless Radio Fixed PartsCR-LDP Constraint-based Routed Label Distribution Protocol (a protocol within MPLS)CRP Command RepeatCRT Cathode Ray TubeCRT Chinese Remainder TheoremCRTC Canadian Radio and Television CommissionCRTS Cellular Radio Telecommunications ServiceCRV Call Reference ValueCS Canadian StandardCS Circuit SwitchedCS1 BICC Capability Set 1CS2 BICC Capability Set 2

CS-ACELP Conjugate Structure ACELPCS-PDU Convergence Sublayer - Protocol Data UnitCSA Called Subscriber Internet Address

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CSA Canadian Standards AssociationCSA Carrier Serving AreaCSC Call Signalling ChannelCSCI Computer Software Configuration ItemCSD Coordinated Standards DocumentCSDN Circuit Switched Data NetworkCSD-P Circuit Switched Data, Point-to-Point ServiceCSE Communication Service Equipment

CSF Signaling Control FunctionCSI Construction Specification InstituteCSMA/CD Carrier Sense Multiple Access/Collision DetectionCSN Circuit-Switched NetworkCSO Curvature of the Second OrderCSPP Computer System Policy ProjectCSR Communications Standards ReviewCSS Communications Standards SummaryCSS Composite Source SignalCSS Convolutional Spectral ShapingCSTA Computer Supported Telecommunications Applications

CSU Customer Service UnitCT Call TraceCT2 Cordless Telephone 2 (ETSI)CTA Council For Terminal AttachmentCTB Composite Triple BeatCTE Connected Telecommunications EquipmentCTIA Cellular Telecommunications Industry AssociationCTE Connected Telecommunications EquipmentCTE Connected Terminal EquipmentCTF Consumer Telephone Forum (Telcordia)CTIA Cellular Telecommunications Industry Association

CTI Computer Telephony IntegrationCTM Cordless Terminal MobilityCTN Corporate Telecommunication NetworksCTO Chief Technical OfficersCTP Common Transport ProtocolCTR Common Technical RequirementsCTRMP Cordless Telephone Range Measurement PerformanceCTX CentrexCU Composite UserCuT codec under testCV Code ViolationCVoADSL Channnelized Voice over ADSLCVoDSL Channnelized Voice over DSLCVoSDSL Channnelized Voice over SDSLCVSD Continuous Variable Slope DetectionCW Call WaitingCW Continuous WaveCWD Call Waiting DeluxeCWID Call Waiting IDCWP Cost Work ProgramCYL Complex stutter dial report

-D-D-AMPS Digital AMPS

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D/A Digital to AnalogD/S DownstreamD/TT Digital Tie TrunkDA Delegated AuthorityDAA Data Access ArrangementDAC D/A ConverterDAL Digital Access LineDAM Diagnostic Acceptability Measurement

DANS Directory and Name ServiceDANS Distributed Access Node SystemDAP Document Application ProfileDAS Door Answering SystemDAT Digital Audio TapeDAVIC Digital Audio-Visual CouncilDAWS Digital Advanced Wireless ServiceDB Data BaseDBA Dynamic Bandwith AssignmentDBM Dual BitmapDBMS Data Base Management System

DBS Direct Broadcast SatelliteDC Data CompressionDC Direct CurrentDC Directionality ClassificationDCA Dynamic Capacity AllocationDCC Data Country CodeDCC Digital Control ChannelDCCH Digital Control ChannelDCD Data Carrier DetectDCE Data Circuit terminating EquipmentDCE Digital Cellular Equipment

DCF Disengage ConFirmationDCME Digital Circuit Multiplication EquipmentDCMS Digital Circuit Multiplication SystemsDCN Disconnect (T.30 )DCP Digital Connectivity ProbingDCOR Draft technical Corrigendum (ISO/IEC)DCR Degradation Category RatingDCS Digital Cellular SystemDCS Digital Command Signal (T.30)DCT Data Calling ToneDCT Discrete Cosine TransformDCT-U Digital Cordless Telephone - U.S.DDI Direct Dialing InDDoS Distributed Denial of ServiceDDR Document Discrepancy ReportDDS Digital Data ServiceDEC Digital Extended Command (proposed T.30 extended negotiations)DECT Digital Enhanced Cordless Telecommunications (ETSI)DEG Draft ETSI GuideDEN Directory Enabled NetworksDEO Digital End Office

DER Digital Extended Request (proposed T.30 extended negotiations)DES Data Encryption Standard (U.S.)DES Digital Extend Signal (T.30)

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DES Draft European StandardDF Data Compression Format (T.class2)DF Deblocking FilterDFD Displaced Frame DifferenceDFE Decision Feedback EqualizerDFP Distributed Functional PlaneDFPA Defense Fire Protection AssociationDG Drafting Group

DGN Director General de Normas (SECOFI, Mexican Standards Organization)DGS Digital StationDH Diffie-Hellman protocolDHCP Dynamic Host Control Protocol (RFC 2131)DHE Document Handling EquipmentDI Digital InterfaceDI Distribution InterfaceDIAMETER IETF protocol used for authentication, authorization and accountingDIC Delay Interval CompensationDID Direct Inward DialingDIG ISDN compatible Digital Station and tie trunk (TIA-646-B)

DIL Digital Impairment LearningDIMRS Digital Integrated Mobile Radio SystemDIN Deutsche Institut fur Normung (German Standardization Institute)DIS Digital Identification SignalDIS Draft International Standard (ISO)DISA Defense Information Systems AgencyDISXML Extended Markup LanguageDJGPP MSDOS port of gccDKTS Digital Key Telephone StationDLC Digital Loop CarrierDLC Dynamic Load Control

DLCI Data Link Connection IdentifierDLL Dynamic Link LibraryDLP Data Protocol (H.DLP)DM Differential ModeDMA Direct Memory AccessDMH Data Message HandlerDMI Desktop Management InterfaceDMI Draft Miscellaneous Work Item (ETSI)DMIF DSM-CC Multimedia Integration FrameworkDMOS Degradation MOSDMP Downlink Measurement ProtocolDMT Discrete MultiToneDMT Discrete Multi-tone CarrierDMTF Desktop Management Task ForceDMV Differential Motion VectorDN Directory NumberDND Do Not DisturbDNI Digital Negotiation Information SignalDNIS Dialed Number Identification ServiceDNK Digital Not acKnowledgeDNS Domain Name Server

DoC Declaration of ConformityDOC Department of CommerceDOC Department of Communications (Canada)

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DOCSIS Data Over Cable Service Interface SpecificationDoD Department of Defense (U.S.)DOE Department of Energy (U.S.)DOL Data Off-LoadingDoS Denial of ServiceDOS Department of State (U.S.)DP Data PrivacyDP Data Pump

DP Dial PulseDPA Data Privacy AlgorithmDPA Document Printing ApplicationDPBX Digital PBXDPCM Digital PCM ModemDPI Dots Per InchDPL Digital Power Line (Q1/15)DPS Data Partitioned SliceDPS Dynamic Power SaveDPNSS Digital Private Network Signaling SystemDPSK Differential Phase Shift Keying

DPT Distribution-Preserving TomlinsonDQoS Dynamic Quality of ServiceDQUANT Field for modified quantization mode (H.263+)DR Discrepancy ReportDRA Dynamic Rate AdaptationDRC Dynamic Rate ChangeDRM Digital Rights ManagementDRQ Disengage RequestDRP ear Drum Reference PointDRR Dynamic Rate RepartitioningDRT Diagnostic Rhyme Test

DRUMS Detailed Revision/Update of MessageDS0 64 kbit/s ChannelDS1 1.544 Mbit/s T1 InterfaceDS3 44.736 Mbit/s T3 InterfaceDSA Directory System AuthenticationDSAA DECT Standard Authentication AlgorithmDSAP Data Services Access ProfileDSAT Digital Supervisory Audio ToneDSC DECT Standard CipherDSCP Differentiated Services Code PointDSI Digital Speech InterpolationDSL Digital Subscriber LineDSL Document SeLectionDSLAM DSL Access MultiplexerDSLF DSL ForumDSM-CC Digital Storage Media - Command and ControlDSMCC Digital System Multimedia Communication ControlDSN Delivery Status NotificationDSN Disposition Service NotificationDSP Digital Signal ProcessingDSR Data Set Ready

DSR Distributed Speech RecognitionDSR Dynamic Symbol ReorderingDSREQ Data Service Request

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DSS1 Digital Subscriber Signaling 1DSU Data Service UnitDSV Distributed Speaker VerificationDSVD Digital SVDDSX Digital Signal Cross-ConnectDT Dual ToneDTA Digital Terminal and Access Project (ETSI)DTAAB DECT Technical Advisory Ad hoc Board

DTAM Document Transfer Access MethodDTAP Direct Transfer Application PartDTC Digital Traffic ChannelDTC Digital Transmit CommandDTD Document Type DefinitionDTE Data Terminal EquipmentDTG Digital TV Group (UK)DTIF Disabilities Issues Task ForceDTL Designated Transit ListDTM Dynamic synchronousTransfer ModeDTMF Dual Tone Multi Frequency

DTR Data Terminal ReadyDTR Draft Technical Report (ETSI)DTS Definitive Telefax StandardDTS Draft Technical Standard (ETSI)DTV Digital TVDTX Discontinuous TransmissionDUT Device Under TestDV Digital VideoDVB Digital Video BroadcastingDVB-T DVB TerrestrialDVCC Digital Verification Color Code

DVD Digital Versatile Disk (also Digital Video Disk)DVEM Differential Vector Error MagnitudeDWDM Dense Wavelength Division Multiplexing

-E-E 20 bit sequenceE&M Ear and Mouth: Separate signaling linesE2E End to EndEA European AccreditationEBNF Extended Backus-Naur Form

EBU European Broadcasting UnionebXML electronic business XML ConsortiumEC Echo CanceledEC Echo CancelerEC Echo ControlEC Error Control (TR-29)EC Error CorrectionEC European CommissionEC Exchange CarriersECB Electronic CodebookECC Expanded Control Channel

ECCA European Cable Communications AssociationECDC Error Correction / Data CompressionECE Echo Cancellation Equipment

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ECIC Electronic Communications Implementation CommitteeECM Error Correction ModeECMA European Communications Manufacturers AssociationECN Encoding Control Notation (ASN.1)ECS Emergency Calling ServiceECSD Enhancement of High Speed Circuit Switched DataECSP Electronic Communications Service ProviderECSQ Entropy Constrained Scalar Quantization

ECT Explicit Call TransferECTA European Competitive Telecommunications AssociationECTEL European Telecommunications and Professional Electronics IndustryECTF Enhanced Communication and Transport ServiceECTF Enterprise Computer Telephony ForumECTRA European Commission of Telecommunications Regulatory AuthoritiesEC-VBR Embedded Coding Variable Bit RateECVQ Entropy Constrained Vector QuantizationEDACS Enhanced Digital Access Communications SystemEDC Electronic Document CoordinatorEDD Electronic Document Distribution

EDGE Enhanced Data rates for GSM EvolutionEDH Electronic Document HandlingEDI Electronic Data InterchangeEDSL Emerging DSL (DSL Forum Study Group)EDSLSG Emerging DSL Study Group (DSL Forum)EDT European Deaf TelephoneEE Equipment Engineering (ETSI Technical Committee)EEA European Economic AreaEEC European Economic CommunityEEMAC Electrical and Electronic Manufacturers Association of CanadaEEP Equal Error Protection

EES Escrow Encryption StandardEFIS Electronic Flight Instrument SystemsEFM Ethernet in the First MileEFR Enhanced Full RateEFRC Enhanced Full Rate CodecEFT Electrical Fast TransientEFTA European Free Trade AreaEG ETSI GuideEG Expert GroupEG AN ETSI Guide Access NetworkEGDIR Expert Group DIRectory system (EWOS)EGMHS Expert Group Message Handling System (EWOS)EGPRS Enhanced General Packet Radio SystemEHS European Home StandardsEI Enhancement Intra (pictures, H.263)EI Error IndicatorEIA Electronic Industry AssociationEIAJ EIA JapanEIC Equipment Installer's CodeEICTA European Information and Communications Technology Industry AssociationEICAS Engine Indicating and Condition Advisory System

EID Equipment IdentifierEID Error Insertion Deviceeifax extended internet fax

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EII European Information InfrastructureEIRP Effective Isotropic Radiated PowerELAWG EMC Laboratories Accreditation Working GroupELCP Emulated Loop Control Protocol (ATMF, ETSI)ELFEXT Equal Level Far-End CrosstalkEM ElectromagneticEMA Electronic Messaging AssociationEMC ElectroMagnetic Compatibility

EMC Equipment Manufacturer's CodeEMCS ElectroMagnetic Compatibility SocietyEME Electromagnetic EmissionsEMI Electromagnetic InterferenceEMI Exchange Message Interface (Bellcore standard for data transmission between RBOC/LECand the IC/IXC/IEC)EMS Element Management SystemEMS Emergency ServicesEMT Electrical Metal TubingE-MTA Embedded Multimedia Terminal AdapterEN Enterprise Network

EN European NormENP Extended Negotiation ProcedureENUM tElephone NUmbering Mapping (IETF)EOB End of BlockEOC Embedded Operations ChannelEOI End of ImageEOL End of Line (T.4)EOM End of Message (T.30)EOR/ERR End of Retransmission/ Response for End of RetransmissionEOS End of SelectionEOS End of Sequence

EOSBS End of Sub-BitstreamEOS-PPS End of Selection for selective polling applicationsEOT End of TransmissionE-OTD Enhanced Observed Time DifferenceEP Enhancement Predicted (pictures, H.263)EP Error PatternEP ETSI ProjectEP Extended ProtocolEPA Environmental Protection AgencyEP-CN ETSI Project Corporate NetworkEP-DTA ETSI Project Digital Terminal AccessEP-EASI ETSI Project-European ATM Services InteroperabilityEPHOS European Procurement Handbook for Open SystemsEPIIC European Program on Information Infrastructure CommitteeEPIISG European Project on Information Infrastructure Starter GroupEPL Echo Path LossEPM Enter Parameter ModeEPP ETSI Partnership ProjectsEPT Echo Protect TimeERC European Radio CommitteesEREC Error Resilient Entropy Code/Error Robust Entropy Code

ERF Emergency Related ForwardingERL Echo Return LossERM ETSI committee on EMC and Radio spectrum Matters

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ERP Ear Reference PointERP Effective Radiated PowerERP EOC Register ProtocolERPS Enhanced Reference Picture SelectionES Echo SuppressorES Elementary StreamES Emergency ServicesES Errored Seconds

ES Escape SequenceES Escape SignalES ETSI StandardES Express SwappingESD Echo Suppressor DevicesESD ElectroStatic DischargeESF Extended SuperFrameESI Electronic Signatures and InfrastructuresESI Emergency Services InterfaceESLR Equivalent SLRES/MS Escape Signal/Mode Select

ESMR Enhanced Specialized Mobile RadioESMTP Extended Simple Mail Transfer ProtocolESN Electronic Serial NumberESNX Expanded Electronic Serial NumberESPM Extended System Parameters MessageESRD Emergency Services Routing DigitsESS Enhanced Signaling SystemseSTL evolving STLET (FCC) Office of Engineering and TechnologyE-TDMA Extended Time Division Multiple AccessETIB European Telecoms Intelligence Bulletin

ETNO European Telecom. Network OrganizationETNS European Telephony Numbering SpaceETO European Telecommunications OfficeETP European Telecommunications PlatformETR ETSI Technical ReportETS European Telecommunications Standard (ETSI)ETSI European Telecommunications Standards InstituteEU European UnionEU MRA European Union Mutual Recognition AgreementsEURESCOM European Institute for Research and Strategic Studies in TelecommunicationsEUROBIT European Association of Manufacturers of Business Machines and Information TechnologyEUT Equipment Under TestEV Embedded VBREVRC Enhanced Variable Rate CodecEWOS European Workshop on Open SystemsEXOR Exclusive OREXP Equal Erasure ProtectionEZW Embedded Zero-tree Wavelet (coding)

-F-FA Flexible Alerting

FAA Federal Aviation Administration (U.S.)FACCH Fast Associated Control ChannelFAMOUS Future Advanced Mobile Universal System

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FAQ Frequently Asked QuestionFAR Federal Aviation Regulations (U.S.)FAS Facility Associated SignalingFAS Frame Alignment SignalFBI Federal Bureau of Investigation (U.S.)FBM FEXT Bit Map mode (G.992.1, Annex C)FC Feature CodeFC Type of commercial fiber optic connector (Threaded)

FC-PH Fibre Channel Physical and Signaling Interface (ANSI X3)FCA Fixed Channel AllocationFCAPS Faults, Configuration, Accounting, Performance and Security (ISO)FCC Federal Communications Commission (U.S.)FCD Fast Track Committee Draft (ISO)FCF Facsimile Control Field (T.30)FCF Forward Control FieldFCS Frame Check SequenceFDA Food and Drug Administration (U.S.)FDAM Final Draft AMendmentFDD Frequency Division Duplexing

FDDI Fiber Distributed Data InterfaceFDM Frequency Division MultiplexingFDIS Final Draft International Standard (ISO)FDM File Diagnostic MessagesFDMA Frequency Division Multiple AccessFDX Full DuplexFE Facilities ExchangeFE Functional EntitiesFEAL Fast Encryption AlgorithmFEC Forward Error CorrectionFEC Frame Erasure Concealment

FECC Far End Camera ControlFE-EC Far End - Echo CancellerFEF Flat Equalized FEXTFEI Federation of Electronic Industries (UK)FEQ Frequency Domain EqualizerFER Frame Error RateFEXT Far End Cross TalkFF Feed ForwardFFPIM Full-mode Facsimile Profile of Internet MailFFS For Further StudyFFT Fast Fourier TransformFG Focus GroupFGS Fine Granularity ScalabilityFHWA Federal Highway Administration (U.S.)FI Format IdentifierFIF File Interchange FormatFIFO First In First OutFIPS Federal Information Processing StandardFIR Finite Impulse ResponseFL Facilities ListFLC Fixed Length Codeword

FLMTS Future Land Mobile Telephony SystemsFM Fault ManagementFM Frequency Modulation

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FMS Flight Management SystemsFMT Filtered MultiToneFNA Functional Network ArchitectureFNE Fixed Network EquipmentFNV Field Not ValidFNV Frame Not ValidFO Fiber Optic (TIA)FO Foreign Office

FOC Fiber Optic ConnectorFOCIS Fiber Optic Connector Intermateability StandardFoIP Fax over Internet ProtocolFOM Figure of MeritFOREG Forced Registration FlagFOTAG Fiber Optic TAGFOTP Fiber Optic Test ProcedureFP Fixed PartFPDAM Final Proposed Draft AmendmentFPGA Field Programmable Gate ArrayFPH Freephone

FPLMTS Future Public Land Mobile Telephone SystemsFPP Frames Per PacketFPS Frames Per Secondfps frames per secondFR Federal Regulation (US)FR Frame RelayFRAPI-A An ISDN Architecture in use in JapanFRC Full Rate CodecFRF Frame Relay ForumFRS Florida Relay ServiceFS Fixed Satellite

FS Frame SizeFS Full ServiceFSA Framework Study AreasFSAN Full Service Access NetworksFSK Frequency Shift KeyingFSM Finite State Machine (H.323 Gatekeeper)FSRA Fast Seamless Rate AdaptationFSS Fixed Satellite ServiceFS VDSL Full Service VDSL (FSAN Committee)FT Fixed TerminalsFT Fixed radio TerminalFTAA Free Trade Area of the AmericasFTAM File Transfer, Access and ManagementFTBP File Transfer Body PartFTH Class 1 command HDLC transmitFTP File Transfer ProtocolFTP Foiled Twisted PairFTRI Florida Telecommunications Relay, Inc. (www.ftri.org)FTT Failure To TrainFTTB Fiber To The BuildingFTTC Fiber To The Curb

FTTCab Fiber To The CabinetFTTEx Fiber To The ExchangeFTTH Fiber To The Home

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FTTO Fiber to the OfficeFUNI Frame Based UNIFVC Forward Voice ChannelFWA Fixed Wireless AccessFWI Flash With InfoFWUF Federal Wireless Users Forum (U.S.)Fx Crossover FrequencyFX Foreign eXchange

FXS Foreign Exchange StationFYI For Your Information

-G-G3FT G3 FX TeleserviceG3G Global Third GenerationGA General Assembly (ETSI)GAL Graphics Adapter LanguageGAP Generic Access ProfileGASP Gatekeeper Synchronization ProtocolGAT Generic Application Template

GATT General Agreement on Trade and TariffsGBSC Group of Blocks Start CodeGCAC Generic CACGCC Generic Conference ControlGDMO Guidelines for the Definition of Managed ObjectsGDMO Generic Definition of Managed ObjectsGDR Global Desired Receive (PSD)GEF Generic Extensibility FrameworkGETS Government Emergency Telecommunications ServiceGF Generic Functional ProceduresGFID GOB frame identification

GFR Guaranteed Frame Rate (ATM Forum)gi gains informationGI Graded IndexGIDS Global IP Directory ServiceGIDS Global IP telephony Database ServiceGII Global Information InfrastructureGISN Global IP-Telephony Subscriber NumberGIT Generic Identifier TransportGK GateKeeperGLP Geographic Location ProfileGMC Global Motion CompensationGMDSS Global Maritime Distress and Safety SystemGMII Gigabit Media Independent InterfaceGMM Global Multimedia MobilityGMR Geostationary Mobile RadioGMSK Gaussian Minimum Shift KeyingGMVC Global Motion Vector CodingGN GOB Number (H.263)GNATT Generic Enhanced Teleservice TransportGOB Group of Blocks (H.261, H.263)GOF Glass Optical Fiber

GONOW ETSI NA Task Force, Managed by European Projuction Information InfrastructureCoordination (EPIC)GOP Group of Pictures

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GoS Grade of ServiceGOSIP Government Open Systems Interconnection ProfileGOSS Guide to Open Systems SpecificationG-PAD Generalized polling protocol - Packet Assembly/DisaaemblyGPCAS Global Product Conformity Assessment SystemGPM General Page MessageGPS Global Positioning SystemGRJ Gatekeeper Reject

GRP Good Regulatory PracticesGRQ Gatekeeper Discovery RequestGPRS General Packet Radio ServiceGSA General Services AdministrationGSC GOB Start CodeGSM Global System for Mobile CommunicationsGSN Global Subscriber NumberGSO Geostationary Satellite OrbitGSS Generalized Spectral ShapingGSS Generic Security Application Programming InterfaceGSS Generic Security Service

GSS Generic Supplementary ServicesGSTN General Switched Telephone Network (i.e., PSTN)GT Global TitleGTA Global Title AddressGTAAB GSM Technical Advisory Ad hoc BoardGTAI Global Title Address InformationGTT Global Title TranslationGUI Graphical User InterfaceGUP Gatekeeper Update ProtocolGW GateWayGWC GateWay Controller

GWLOC Gateway Location protocol

-H-H/W HardwareHAC Hearing Aid CompatibleHAM Amateur RadioHAN Home ATM NetworkHATIS Hearing Aid Telephone Interconnect SystemHATS Head and Torso SimulatorHC Header CounterHDLC High level Data Link ControlHDLU High speed Dynamic Link UnitHDML Handheld Device Markup Language, a forerunner of WMLHDSL High-rate Digital Subscriber LineHDTV High Definition TelevisionHDX Half DuplexHE High EndHE-LPC Harmonic Excitator Linear Predictive CoderHEMP High Energy Electromagnetic PulsesHES Home Electronic SystemHF High Frequency

HF Human FactorsHFC Hybrid Fiber CoaxHFCI The H.323 Firewall Control Interface

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HFR Hybrid Fibre RadioHFT Hands Free TelephoneHFTP Hybrid-Fiber Twisted PairHFX Hawthorne Facsimile CipherHHR Half-Horizontal Resolution (352 by 480 or 576)HI High ImpedanceHIA Hearing Industries AssociationHINE Heterogeneous In-house Networking Environment

HIPERLAN High Performance Radio Local Area NetworkHIPPI High-Performance Parallel InterfaceHKM Hawthorne Key ManagementHLC Higher Layer CompatibilityHLF Home Location FunctionHLI High Layer InformationHLR Home Location RegisterHLTF High Level Task ForceHLTG High Level Task GroupHMAC Keyed-Hashing for Message AuthenticationH-MLP High Speed Multi Layer Protocol

HNI Home Network IdentityHNS Hughes Network SystemsHNOS Home NetWork Operating SystemHNW Home NetWork (VESA)HO Hand OffHomePNA Home Phoneline Networking AllianceHPC High Probability of CompletionHPCI Harmonized Programmable Communications InterfaceHPF High Pass FilterHPL Home-Phone LANHPLI Higher Layer Protocol Identifiers

HPNA Home Phoneline Network AllianceHPUX Unix in HP workstationsHRC Half Rate CodecHRD Hypothetical Reference DecoderHRDJ1 Hardwired JackHS Harmonized StandardsHSCSD High Speed Circuit Switched DataHSD High Speed Data ChannelHSM High Speed ModemHSP Host Signal ProcessingHSSG High Speed Study Group (IEEE)HSSI High Speed Serial InterfaceHSTU-C High Speed Transceiver Unit - CentralHSTU-R High Speed Transceiver Unit - RemoteHTML Hyper Text Markup LanguageHTTP HyperText Transport ProtocolHTU-C Handshake Transceiver Unit - Central Office EndHTU-R Handshake Transceiver Unit - Remote Terminal EndHW HardwareHWCI Hardware Configuration Item

-I-I Intra (Q6/16, VCEG)I&I Interworking and Interoperability

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I/G Implementors GuideI/O Input/OutputIA Implementation AgreementIA Interoperability AgreementsIAA I Am Alive (emergency system)IA5 International Alphabet No. 5, now called International Reference Alphabet (IRA)IAC Industry Advisory Committee/CouncilIACM Industry Advisory Committee Meeting (UL)

IAD Integrated Access DeviceIAEI Israel Association of Electronics IndustriesIAF Internet Aware Fax (T.38)IAM Initial Address MessageIANA Internet Assigned Number AuthorityIAP Intercept Access PointIAS Industrial Applications Society (IEEE)IAT Internet access timeIB Indicator BitsIBS Intelligent Building SystemsIC Impairment Combination

IC Industry CanadaIC Interexchange CarrierICA Information Communication ArchitectureI-CAN Integrated Customer Access NetworkICANN Internet Corporation for Assigned Names and NumbersICC International Coordination Committee (ISO)ICCID Integrated Circuit Card IDICCF Industry Carriers Compatibility ForumICD International Code DesignatorICEA Insulated Cable Engineers AssociationICF InfoConfirm

ICFA International Computer Facsimile AssociationICG Intersector Coordination GroupICI Inter Carrier InterferenceICO Intermediate Earth OrbitICS Digital line interface to ISDN Compatible Station meeting requirements of TIA/EIA-579ICS Incoming Call ScreeningICS Implementation Conformance StatementICS Interoperability Compliance Statement (DSL Forum)ICT Information and Communication Technology (ETSI)ICT Integer Cosine TransformsI-CTR Interim Common Technical RequirementsICTSB Information and Communication Technology Standards BoardICV Integrity Check ValueICWWG Interagency Cellular and Wireless Working GroupID delay impairment valueID IdentificationIDB J2366 ITS Data BusIDCT Inverse Discrete Cosine TransformIDEA International Data Encryption Algorithm (Proprietary, from Ascom Tech. AG)IDFT Inverse Discrete Fourier TransformIDL Interface Design Language

IDLC Integrated Digital Loop CarrierIDRA Integrated Dispatch Radio SystemIDS Integrated Directory Service

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IDSL ISDN Digital Subscriber LineIE protocol discriminator Information ElementIEB Industrial Electronic BulletinIEC International Electrotechnical CommissionIECEE Compliance with IEC for Electrical EquipmentIEEE Institute of Electrical and Electronic EngineersIEMS International Emergency Multimedia ServicesIEPS International Emergency Preference Scheme (ITU-T E.106 [2000])

IESG Internet Engineering Steering GroupIETF Internet Engineering Task ForceI-ETS Interim ETS (ETSI Standard)IF Intermediate FrequencyIF Isolation FiltersIF Isolation FunctionIFA Informal FTP AreaIFAST International Forum on AMPS Standards Technology (CTIA)IFAX Internet FacsimileIFBCA Internet Fax and Business Communications AssociationIFFT Inverse Fast Fourier Transform

IFP Internet Facsimile ProtocolIFTP Informal FTP areaIG Implementer's GuideIG Interoperability GroupIGMP Internet Group Management ProtocolIIF Interworking Interoperability FunctionIIP Itinerant Internet ProtocolIIR Institute for International ResearchIIS Inteface Implementation Specifications (Telemanagement Forum)IITF Information Infrastructure Task ForceILC Identifier Length Content

ILD Insertion Loss DeviationILEC Incumbent Local Exchange CarriersILMI Integrated Local Management Interface (ATMForum)IM Instant MessagingIM Inter-modulationIM Internet Multimedia (3GPP)IMA Interactive Multimedia AssociationIMA Inverse Multiplexing for ATMIMBE Improved MultiBand ExcitationIMC Internet Mail ConsortiumIMD Inter Modulation DistortionIME ILMI Management EntityIME Interface Management EntityIMEI International Mobile Equipment IdentifierI-mode Idle modeIMP Internet Modem ProtocolIMPP Instant Messaging and Presence Protocol (IETF)IMRS Interactive Multimedia Retrieval ServicesIMS Interactive Multimedia ServicesIMSF IS-41 Message Security ForumIMSI International Mobile Subscriber Identity

IMT International Mobile Telecommunications (IMT-2000)IMTC International Multimedia Teleconferencing ConsortiumIN Intelligent Networking

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INAA Integrated Network Access ArrangementINAP Intelligent Network Application ProfileIN/B Intelligent Network/BroadbandINC International CarrierINF IN ForumINMD In-service Non-intrusive Measurement DeviceINMETRO Instituto Nacional de Metrologia, Normalizacion e Qualidad Industrial (Brazil)iNOW interoperability NOW!

INTAP Interoperability Technology Association for Information Processing (Japan)INTSERV Integrated ServicesIOL InterOperability Laboratory (University of New Hampshire)IOS Inter-Operability SpecificationsIP Intellectual PropertyIP Intelligent PeripheralIP Internet ProtocolIPAD Internet Packet Assembler DisassemberIPAT Internet Protocol Access TerminalIPB Improved PBIP BCP Internet Protocol Basic Call Processing (SG11)

IPBCP IP Bearer Control ProtocolIPBX Internet PBXIP-CME Circuit Multiplication Equipment optimized for IP-based NetworksIPCP Internet Protocol Control Protocol (RFC1332)IPDC IP Device ControlIPDR IP Detail Record (Consortium)I-PDU Information PDUIPFN IP Federating Network (SPAN14 and TIPHON project)IPN Intelligent Packet NetworkIPNS ISDN PBX Network SpecificationIPP Internet Printing Protocol

IPR Intellectual Property RightsIPSEC IP Security (IETF)IPT Internet Protocol TelephonyIPTD IP Packet Transfer Delayiptel Internet Protocol Telephony (IETF Working Group)IPUI International Portable User IdentityIPUI R International Portable User Identity for public/GSMIRA International Reference AlphabetIRA Internet Routing AddressIRDA Infrared Interface CommitteeIREG ITU-T Recommendation Experiment GroupIRM International Roaming MINIRQ Interworking Service Request identifierIRR Information Request ResponseIRS Intermediate Reference SystemIS Interim Standard (U.S.)IS International Standard (ISO)ISA Industry Standard ArchitectureISC International Softswitch ConsortiumISC International Switching CenterISCI Inter-Symbol and Channel Interference

ISCRI International Special Committee on Radio InterfaceISD Independent Segment DecodingISD Integrated Services Digital (TIA-646-B)

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ISD International Standards DevelopmentISDN Integrated Services Digital NetworkISDN-BA ISDN Basic AccessISDN BRA ISDN Basic Rate AccessISDN-PA ISDN Primary AccessISD/TT Integrated Services Digital/Tie TrunkISI Inter Symbol InterferenceISIS Information Society Initiatives in Standardization

ISLP Intersystem Link ProtocolISM Industrial, Scientific, MedicalISN Interface Service NodeISN Interface Serving Node (SG11)ISO International Organization for StandardizationISOC Internet SocietyISOL Integrated Services Over Low speed serial inksISP International Standardized ProfileISP Internet Selective PollingISP Internet Service ProviderISPBX Integrated Services Private Branch Exchange

ISPT Italian PTTISRF Internet Screenphone ForumISS Inter-Satellite ServiceISSG Internet Services Study Group (MSAF)ISSLL Integrated Services over Specific LinksISSLOW Integrated Services System for Low Bitrate EnvironmentsIST Integrated Services TrunkIST ISDN tie trunksISTO Industry Standards and Technology OrganizationISTP IPCablecom Signaling Transport ProtocolIST/TT IST and other Tie Trunk

ISUP ISDN User PartISWG Interoperability Sub-Working Group (ADSL Forum)IT Information TechnologyIT Intermediate TrunkITAAB ISDN Technical Advisory Ad hoc BoardITAAG ISDN Technical Advisory Ad hoc GroupITAC Information Technology Association of CanadaITAC ITU-T Advisory CommitteeITAD Integrated Telephone Answering DeviceITAR International Traffic in Arms RegulationsITD Interface Telecom DomotiqueITE Information Technology EquipmentITI Information Technology Industry Council (formerly CBEMA)ITIC Information Technology Industry CouncilITL Independent Testing LabsITM Informative Test MethodsITOC Independent Telephone Operating CompanyITS Institute for Telecommunications SciencesITS Intelligent Transport SystemITSB Image Technology Standards BoardITSI Individual TETRA Subscriber Identity

ITU International Telecommunication UnionITU-R ITU Radiocommunications SectorITU-T ITU Telecommunications Sector

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ITU-TSB ITU Telecommunications Standardization BoardITUDOCS Electronic Document Service of ITUITV Interactive TelevisionIUT Implementation Under TestI-V Current - VoltageIV Initialization VectorIVCD Initial Voice Channel DesignationIVN Intervening Networks

IVP Integrated Voice ProtocolIVPC Integrated Voice Protocol and CommandsIVR Interactive Voice ResponseIVS Integrated Video ServicesIWF Inter-Working FunctionIWU Interworking Unit

-J-JADSL ADSL for ISDNJBIG Joint Binary Image GroupJC Joint Capabilities

JCCR Joint Committee on Cellular RoamingJCG Joint Coordination GroupJDC Japan Digital CellularJEEC Joint ETSI/ECMA CommitteeJEM Joint Experts MeetingJFIF JPEG File Interchange FormatJITC Joint Interoperability Test CenterJM Joint MenuJPC Joint Project CommitteeJPT Joint Project TeamJPEG Joint Photographics Expert Group

JPG Joint Presidents Group (CEN/CENELEC/ETSI)JQG Joint Question GroupJRG Joint Rapporteurs GroupJSC Joint Sectoral CommitteeJSD Joint Standards DocumentsJTACS Japanese TACS SystemJTAPI JAVA Telephony APIJTC Joint Technical CommitteeJURA JPEG Utilities Registration AuthorityJUSTINTAC Joint User Supplier TIA ICEA NEMA Technical Advisory CommitteeJWG Joint Working Group

-K-KLT Karhunen-Loeve TransformKTA Key Technical AreasKTS Key Telephone SystemKY totally protected key systems (FCC Part 68 Form 730)

-L-L2TP Tunneling Protocol, standardized encapsulation capable of carrying multiple PPP sessionsl2tpext Layer 2 Tunneling Protocol Extensions (IETF)

LA Local Application (T.611)LA Look AheadLAC L2TP Access Concentrator

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LAC Link Access ControlLADC Local Area Data ChannelsLAES Lawfully Authorized Electronic SurveillanceLAIC Lawfully Authorized Intercept CapabilityLAN Local Area NetworkLANE LAN EmulationLAP Link Access ProtocolLAPB Link Access Protocol B (ISDN-B Channel)

LAPD Link Access Protocol D (ISDN-D Channel)LAPF Link Access Protocol - FrameLAPM Link Access Protocol for Modems (V.42)LAPV Link Access Protocol - Video TelephoneLAR Log Area RatioLATA Local Access Transport AreaLB Letter BallotLB Loop Back (Rec. I.610)LBC Low Bit rate CoderLBO Line Build OutLBS Location Based Service

LC Last Call (ITU, IETF)LC Logic ChannelLCAP Large Cell Access ProfileLCD Liquid Crystal DisplayLCD Loss of Cell DelineationLCF Location ConfirmLCFO Line Current Feed OpenLCF-PMD Low Cost Fiber-Physical Medium DependentLCL Longitudinal Conversion LossLCN Logical Channel NumberLCP Link Control Protocol

LCTL Longitudinal Conversion Loss TransferLD Long DistanceLDAP Lightweight Directory Access ProtocolLDCELP Low Delay CELPLDDS Limited Distance Data ServiceLDLL Limited Degradation of the Long LoopLDM Limited Distance Modem (CS-03)LDP Label Distribution ProtocolLDPA Light Document Printing ArchitectureLDPC Low Density Parity CheckLE Local ExchangeLEC Local Exchange CarrierLEO Low Earth OrbitLES Loop Emulation ServiceLHS Left Hand SideLI Lawful InterceptionLISN Line Impedance Stabilization NetworkLL Leased LineLLC Logical Link ControlLLI Lower Layer InformationLLID Loopback Location Identifier (Rec. I.610)

LMCO Lockheed Martin Corporation and EricssonLMCS Local Multipoint Communications SystemLMDS Local Multi-point Distribution Service

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LMF Location Management FunctionLMR Land Mobile RadioLMS Land Mobile ServiceLMS Loop Management SystemLMSI Local Mobile Station IdentityLNP Local Number PortabilityLNS L2TP Network ServerLO Local Oscillator

LOI Letter of IntentLON Local Operating NetworksLOO Likelihood of OccurrenceLOS Loss of SignalLOSQ Listening Only Speech QualityLPC Linear Predictive CodingLPF Low Pass FilterLPIC Primary / Presubscribed Interexchange/IntraLATA CarrierLR Loudness RatingLRCC Last Registration Control ChannelLRE Low bit Rate Encoding

LRF Location Registration FunctionLRFD Load and Resistance Factor DesignLRJ LocationRejectLRN Location routing number for LNPLRQ Location RequestLS Lossless and near LosslessLSAS Line-Side Answer SupervisionLSB Least Significant BitLSD Low Speed Data channelLSO Loopback Service Options (cdma2000)LSOG Local Service Ordering Guidelines

LSP Line Spectral PairLSP Local Service ProviderLSSGR LATA Switching Systems Generic Requirements (Bellcore)LSTR Listener Sidetone RatingLT Line TerminationLTP Long Term PredictionLTU Line Terminating UnitLU Logical UnitLUS Location Update ServiceLVD Low Voltage DirectiveLVDS Low Voltage Differential SignalingLW Long WaveLZJH Lempel-Ziv-Jeff.HeathLZW Lempel-Ziv-Welch algorithm

-M-MA Moving AverageMA Mobile ServiceMAC Management Ad Hoc Committee (TR-41)MAC Media Access ControlMACA Mobile Assisted Channel Allocation

MAH Mobile Access HuntingMAHO Mobile Assisted HandoffMAP Media Access Procedure

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MAP Mobile Application PartMAPI Messaging APIMAPI Microsoft APIMASA Multimedia Services Affiliate ForumMATV Master Antenna TelevisionMAWG Message Attachment Work GroupMB Macro BlockMBA Macroblock Address (H.263)

MBE Multi-Byte ExtensionMBFT Multipoint Binary File TransferMBMP Modem Bank Management ProtocolMBN Multiservice Broadband NetworksMC Message CenterMC Multipoint Controller (H.323)MCBPC Macroblock type & Coded Block Pattern for ChrominanceMCC Mobile Country CodeMCC Modem Control ChannelMCCC Multiple Concatenated Convolutional CodesMCD Mobile Communications Division

MCF Message Confirmation (T.30)MCID Multi-line Caller IdentificationMCM Multi-Carrier ModulationMCP Motion Compensated PredictionMCPE Motion Compensated Prediction ErrorMCNS Multimedia Cable Network SystemMcps Megachips per secondMCS Multi-point Control Services (T.122)MCU Multi-point Control UnitMCV Multipoint Command VisualizationMD-IS Mobile Data Intermediate System

MD Manufacturer DefinedMDBS Mobile Data Base StationMDC Manufacturer Declaration of ConformityMDC Multiple Description CodingMDCP Media Device Control ProtocolMDCR Minimum Desired Cell RateMDELFEXT Multiple-Disturber Equal-Level Far-End CrosstalkMDF Mux Data FrameMDI Medium Dependent InterfaceMDLP Mobile Data Link ProtocolMDN Message Disposition NotificationMDN Mobile Directory NumberMDTP Multi-network Datagram Transmission ProtocolMDU Multi-Dwelling UnitME Mobile EquipmentME Motion EstimationMED Multiplexer Entry DescriptorMegaco MEdia GAteway Control Protocol (IETF)Megacop MEdia GAteway COntrol ProtocolMEI Multiple Extension InterworkingMEI Multiple Extension In use (TIA/EIA-777-A)

MELP Mixed Excitation Linear PredictionMER Message Error RateMERS Minimal Essential Requirements

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M-ES Mobile End SystemMES Mobile Earth StationMF fully protected hybrid systems (FCC Part 68 Form 730)MF Multi-tone FrequencyMFJ Modified Final JudgmentMFP Multi-Function PeripheralMFPA Multi-Function Peripheral AssociationMFPI Multi-Function Peripheral Interface

MFPL Multi-Function Peripheral LanguageMFPP Multi-Function Packet ProtocolMG Management GroupMG Media GatewayMGC Media Gateway ControllerMGCP Media Gateway Control ProtocolMGT Mobile Global TitleMH MultiHypothesis motion pictures (H.26L)MHEG Multimedia and Hypermedia Experts GroupMHP Multimedia Home PlatformMHS Message Handling System X.400

MI Miscellaneous Work Item (ETSI)MI Mode IndicatorMIB Management Information BaseMIGG MRA Implementation Guide GroupMIF Management Information FileMII Ministry of Industry Information (China)MIM Man in the MiddleMIME Multipurpose Internet Mail ExtensionMIMO Multi-Input-Multi-OutputM-IN Multimedia Intelligent NetworkingMIN Mobile Identification Number

MIN Mobile Intelligent NetworkMIP Mobile Internet ProtocolMIPS Million Instructions Per SecondM-IRS Modified IRSMIRS Multimedia Information Retrieval ServicesMIV Multipoint Indication VisualizationML Maximum LikelihoodMLC Multiple Logical ChannelMLP Multi-Layer ProtocolMLPP Multi-Level Precedence and PreemptionMLT Modulated Lapped TransformMLTS Multi-Line Telecommunications SystemsM-LVDS Multipoint Low Voltage Differential SignalingMLWW Multi Layered Winding WireMM Mass Media (FCC)MM Mobility ManagementMM MultiMediaMM MultimodeMMAP Mobility Management Application Protocol (T1S1)MMBAN Multi Media Broadband Access NodesMMC Multiple Modulus Conversion

MMCF Multimedia Communications ForumMMCOI Multimedia Communications Community of InterestMMDS Multichannel Multipoint Distribution Service

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MMF Multi Mode Optical FiberMMG Multimedia Management Group (ETSI)MMH-MAC Multilinear Modular Hash - Message Authentication CodeMMI Man-Machine Interface (TTT Services)MMI Modem Management InterfaceMMITS Modular Multifunction Information Transfer Systemmml mobile multilinkMMO Modem Managed Objects

MMoMBN Multimedia over MBNMMR Modified Modified ReadMMRA Model Mutual Recognition AgreementMMS Multimedia Messaging ServiceMMUSE Multiparty Multimedia Session ControlMMUSIC Multiparty Multimedia Session Control (WG)MNA Management Network ArchitectureMNC Mobile Network CodesMNE Mobile Network EntityMNLP Mobile Network Location Protocol (IS-732-501)MNP4 Microcom Networking Protocol

MNRP Mobile Network Registration ProtocolMNRU Modulated Noise Reference UnitMO Mobile OriginatedMOCS Managed Objects Conformance StatementsMODB Macroblock mode for B-blocksMoDSL Modems over DSLMOH Modem on HoldMoIP Modems over Internet ProtocolMOPS Million Operations Per SecondMOS Mean Opinion ScoreMoU Memorandum of Understanding

MOU Memorandum of UnderstandingMP Modulation ParameterMP Multipoint Processor (H.323)MPC Mobile Position CenterMPCI Mobile Protocol Capability IndicatorMPD Mode Power DistributionMPE Maximum Permissive ExposureMPEG Motion Picture Experts GroupMPI Minimum Picture IntervalMPh Half Duplex Modulation Parameters in the V.34 negotiationMPL Multiplex Payload Length fieldMPLS Multi-Protocol Label SwitchingMP-MLQ Multi-Pulse - Maximum Likelihood QuantizerMPOP Main Point of Penetration (where phone lines enter the residence)MPPC Microsoft Point to Point CompressionMPS Minimum Performance SpecificationMPU Multiple Port UnitMQ Modified QuantizationMQLVS Multi-Quality Layered Video ServiceMR Mode RequestMR Modified Read

MR MultiRateMRA Mutual Recognition AgreementsMRC Mixed Raster Content

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MRD Market Requirements DocumentMRM Meeting Room ManagementMRP Markov Renewal ProcessMRPC Multipoint Remote Procedure CallMRU Maximum Receive UnitMS Management ServicesMS Mobile StationMS Mode Select

MSAF Multimedia Services Affiliate ForumMSB Manufacturer Specified BlocksMSB Most Significant BitMSBN MultiService Broadband NetworkMSC Message Sequence ChartMSC Mobile Switching CenterMSC-BC Mobile Switching Center - Base CenterMSCID Mobile Switching Center IdentificationMSCIN Mobile Switching Center Identification NumberMSC-VBR Multi-mode Source Controlled Variable Bit-RateMSD Master Slave Determination

MSD Minimum Significant DifferenceMSDL MPEG-4 Syntactic Description LanguageMSDN Multi-Service Data NetworkMSE Mean Squared ErrorMSF Multiservice Switching ForumMSI Manufacturer Specific InformationMSI Maximum Symbol InversionMSID Mobile Station IdentityMSIN Mobile Station INput (GSM)MSIN Mobile Subscriber Identification NumberMSISDN Mobile Station ISDN

MSJ Multiple Selective RejectMSLT Minimum Scan Line TimeMSN Microsoft NetworkMSN multiple subscriber numberingMSO Markov Service Option (cdma2000)MSR Multi-Selective RejectMSR Market Service RequirementMSS Mobile Satellite ServicesMSSF Multi Service Switching ForumMST MESSAGE TYPE fieldMSWG Mobile Services Working Group (NAFTA/CCT)MT Mobile TerminalMT Mobile TerminatedMT Mode ToggleMT Type of commercial fiber optic connectorMT2 Cellular User's Mobile TerminationMTA Major Trading AreaMTA Multimedia Terminal Adapter (SG9)MTA Multimedia Terminal and ApplicationsMTH Module Telecom HomeMTIE Maximum Time Interval Error

MTM Mobile Test ModelMTP Message Transfer PartMTP Message Transfer Point

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MTP Multicast Transport ProtocolMTP/SO Multiple Transport Protocol/Self OrganizingMTS Methodology of Test SuitesMTS Methods for Testing and Specification (ETSI TC)MTSO Mobile Telephone Switching OfficeMTTCM Multi-tone Turbo Trellis Coded ModulationMTU Maintenance Terminating UnitMTU Maximum Transfer Unit

MTU Multiple Terminal Unit (DSL Forum)MUB Multi-Use Bearer ServiceMUT Modem Under TestMUTOA Multi-User Telecommunications Outlet AssembliesMUX MultiplexerMV Membership Vote (ETSI)MV Motion VectorMVA Multipoint Visualization AchievedMVC Mobile Video CoderMVC Multipoint Visualization CapabilityMVD Motion Vector Data

MVNO Mobile Virtual Network OperatorMVPD Multi-channel Video Programming DistributorMVR Multipoint Visualization Refused/RevokedMVV Multirate/VAD VBRMW Mid WaveMWC Multi-Way CallingMWI Message Waiting IndicationMWIF Mobile Wireless Internet ForumMWN Message Waiting Notification

-N-

N NewtonsNA Network Aspects (ETSI TC)NA North AmericaNAB National Association Of BroadcastersNACK Negative AcknowledgmentNACLA National Cooperation for Laboratory AccreditationNAFTA North American Free Trade AgreementNAG Network Architecture Group (DSL Forum)NAG Network Reference Models, Acronyms and Definitions, and Guide to Standards Ad Hoc(TIA TR-45)NAI Network Access Identifier (RFC 2468)NAK Negative AcknowledgmentNAK-NS Negative Acknowledgment - Not SupportedNAK-NU Negative Acknowledgment - Not UnderstoodNAL Network Adaptation LayerNALAG Network Adaptation Layer Ad hoc GroupNAM Number Assignment ModuleNAMPS Narrowband AMPSNANC North American Numbering CouncilNANP North American Numbering PlanNANPA North American Numbering Plan Administrator

NAP Network Access ProviderNAPT Network Address Port TranslationNAPTR Naming Authority Pointer

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NAR Numbering, Addressing and Routing Committee of ETSI NA2NASNA National Association of State 9-1-1 AdministratorsNAS Network Access ServersNASRNG Network Access Server RequirementsNAT Network Address TranslationNATA North American Telephone AssociationNATO North Atlantic Treaty OrganizationNAVDEC Network Access Server and Voice on IP Device Control

NA/WCPE North American WCPENB Narrow BandNBC Non-backward CompatibleNBDG New Business Development GroupNBS Net Broadcast ServiceNBS Network Based SolutionNBSP NarrowBand Signal PowerNC Network CodesNCA Non-Call AssociatedNCAG Network Commonality Ad Hoc GroupNCG Number Consulting Group (Bellcore)

NCaps Capabilities with No sub-fieldsNCAS Non-Call Associated SignalingNCITS National Committee for Information Technology StandardsNCP Network Connection PointNCRP National Council of Radiation Protection and MeasurementNCS Network-based Call SignalingNCS Nurse Call SystemNCTA National Cable Television AssociationNCTE Network Circuit Terminating EquipmentND NSF Message data IndicationNDA Non-Disclosure Agreement

NDB Networked DataBase ServiceNDC National Destination Code (ITU)NDIS Network Driver Interface SpecificationNDSS Network Directed System SelectionNE Network ElementNE Network EntityNEBS Network Equipment Building System, a Bellcore environmental requirements specificationNEC National Electric Code (U.S.)NECA National Electrical Contractors AssociationNECQ National Electronic Components Quality Assessment SystemNE-EC Near End - Echo CancellerNEMA National Electrical Manufacturers AssociationNENA National Emergency Number AssociationNESC National Electric Safety CodeNET Norme Europeenne de TelecommunicationNEW FORUM Former COCOMNEXT Near End Cross TalkNFPA National Fire Protection Agencyng Next GenerationNGDLC Next Generation Digital Loop CarrierNGN Next Generation Network

NGN SG Next Generation Network Starter GroupNGOF Next Generation Optical FiberNGOSS New Generation Operations Support Systems (TM Forum)

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NGSO Non-Geostationary Satellite OrbitNHRP Next Hop Resolution ProtocolNHTSA National Highway Traffic Safety AdministrationNI National ISDNNI Network InterfaceNIA Network Indicate Address (H.230)NIBS National Institute for Building StandardsNIC Network Interface Card

NID Network IdentificationNID Network Interface DeviceNID Network Interface or DemarcationNIDAB Narrow Band Digital BroadcastingNII National Information InfrastructureNIO Network Input OutputNIP Number Identification PresentationNISDN National ISDNNIST National Institute of Standards and TechnologyN-ISDN Narrowband ISDNN-ISUP Narrowband ISDN User Part

NIU Network Interface UnitNIUF North American ISDN Users ForumNLD Non-Linear DistortionN-LLC Narrowband Logical Link ControlNLP Non-Linear Processornm NanometerNM Network ManagementNMAG Network Management Ad hoc GroupNMC Network Management CenterNMC Network Model CoverageNMDS Narrowband Multi-service Delivery System

NMF Network Management ForumNMS Network Management SystemNMSI National Mobile Station IdentificationNMT Nordic Mobile TelephonyNMX Normas Mexicanas (non-mandatory Mexican standard)NNI Network to Network InterfaceNOF Network Operations ForumNOI Notice of InquiryNOM Mexican National StandardsNO PROBLEM NOn PROprietary reliaBLe Electronic MailNP Network ProviderNP Non-PublicNP Number PortabilityNPA Network Provider AccessNPA Numbering Plan AreaNPI Numbering Plan IndicatorNPID Network Provider IdentificationNPR Noise Power RatioNPRM Notice of Proposed Rule Making (FCC)NPRP Number Portability Routing Protocol (ETSI TIPHON Project)NR Noise Reduction

NR Nordstrom-Robinson (FEC)NRA National Regulatory AuthorityNRC Negotiated Rulemaking Committee

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NRC Network Reliability CouncilNRIC National Reliability and Interoperability CommissionNRM Network Reference ModelNRTL Nationally Recognized Testing LaboratoryNRZ Non-Return to ZeroNRZI Non-Return to Zero on OnesNS-cap Non-Standard capabilityNS/EP National Security and Emergency Preparedness

NSA National Security Agency (U.S.)NSAP Network Service Access PointNSB National Standardization BodyNSC Non-Standard Facilities CommandNS/EP National Security/Emergency PreparednessNSF Network-Specific FacilitiesNSF Non-Standard FacilitiesNSIE Network Security Information ExchangeNSMA National Spectrum Managers AssociationNSO National Standard OrganizationNSP Network Service Provider

NSRA Normal Seamless Rate AdaptationNSRP Numbered SRP response framesNSS Non-Standard SetupNSTAC National Security Telecommunications Advisory CommitteeNT Network TerminationNTCA National Telephone Cooperative AssociationNTE Network Terminating EquipmentNTIA National Telecommunications and Information AdministrationNTP Network Termination PointNTP Network Time ProtocolNTQ Near Toll Quality

NTR Network Timing ReferenceNTR Network Timing Reference markerNTRAC New Technical Regulations Approval Committee (former TRAC), ETSINTSC National Television System CommitteeNTU Network Terminating UnitNVCASE National Voluntary Conformity Assessment System EvaluationNVLAP National Voluntary Laboratory Accreditation ProgramNVOD Near Video on DemandNVRAM Non-Volatile RAMNWK Network, Layer 3 of the WCPE protocol stackNYCE Certification Body accredited by SECOFI (Mexico)

-O-O&M Operations and MaintenanceO&NM Operations and Network Management working group (DSL Forum)O&P Ordering & Provisioning Committee (ATIS)OA&M Operations, Administration, and MaintenanceOAA On Air ActivationOAM Operations, Administration, and MaintenanceOAM&P Operations, Administration, Maintenance & ProvisioningOAN Optical Access Network

OAP One step Approval Procedure (ETSI)OAS Organization of American StatesOATS Over-the-Air Activation TeleService

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OBMC Overlapped Block Motion CompensationOBF Ordering and Billing ForumOBP On-Board ProcessingOC Operation ChannelOCCS Overall Construction Classification SystemOCD Out of Cell Delineation (UNI 3.0)OCDMA Orthogonal CDMAOCG Operational Coordination Group (ETSI)

OCG Overall Coordination GroupOCI Open Circuit IntervalOCR Optical Character RecognitionODA Open Document ArchitectureODBC Open DataBase ConnectivityODL Object Definition LanguageODP Open Distributed ProcessingODP Originator Detection Pattern (V.42)ODTC Office of Defense Trade Controls (US)OEM Original Equipment ManufacturerOET Office of Engineering and Technology (FCC)

OFB Output FeedbackOFDM Orthogonal Frequency Division MultiplexingOFS Operational Fixed Service (Microwave)OFSTP Optical Fiber Systems Test ProcedureOftel British Office of TelecommunicationsOGM Out-Going MessageOHG Operator Harmonization GroupOI Outline of InvestigationOID Object IdentifiersOIW Open Systems Implementers WorkshopOJ Official Journal

OJEC Official Journal of the European CommunitiesOLC Open Logical ChannelOLR On-Line ReconfigurationOLR Overall Loudness RatingOLT Optical Line TerminationOM Object ModelOM Optical fiber Multimode categoryOMCI Operation, Management and Control InterfacesOMG Object Management GroupOMT Overhead Message TrainONE Other Network Entities (Omega Networks)ONP Open Network ProvisionONS On Premise StationONT Optical Network TerminationONU Optical Network UnitOOB Out of BandOOF Out of FrameOPASTCO Organization for the Promotoion and Advancement of Small Telecommunications CompaniesOpenVoB Voice over Broadband http://www.openvob.orgOPS Off Premise StationOPTIS Overlapped PAM Transmission with Interlocking Spectra

OPTS Over-the-Air Programming TeleserviceO-QAM Orthogonally multiplexed QAMORDQ Order Qualification

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ORREQ Origination RequestOS Operating SystemOS Optical fiber Singlemode categoryOSH Occupational Safety and HealthOSHA Occupational Safety and Health Administration (U.S.)OSI Open Switching IntervalOSI Open System InterconnectionOSN One Stop Notification

OSP Open Settlement ProtocolOSP OutSide PlantOSPF Open Shortest Path FirstOSS Operations Support SystemsOTA Over-the-Air ActivationOTAFG OTA Focus GroupOTAPA Over-the-Air Parameter AdministrationOTAR Over-the-Air Rekeying (APCO Project 25)OTASP OTA Service ProvisioningOTDR Optical Time Domain ReflectometerOTFI One Time Feature Indicator

OTI Open Telecom Infrastructure

-P-P Predicted (Q6/16, VCEG)P&A Privacy and AuthenticationPA Partial AgreementPA Pass Along (Operation code)PABX Private Automatic Branch eXchangePAC Program Advisory CommitteePACA Priority Access and Channel AssignmentPACA-E Enhanced Priority Access and Channel Assignment Supplement Service

PACC Partition, Aggregation and Conditional CodingPACS Personal Access Communications System, Licensed BandPAC-U Personal Access Communications System, Unlicensed BandPAD Packet Assembler DisassemblerPAG Practical Application GuidelinesPAGODA Profile Alignment Group on ODAPAL Phase Alteration LinePAM Pulse Amplitude ModulationPAMS Perceptual Analysis/Measurement SystemPAR Peak to Average RatioPAR Pixel Aspect RatioPAS Publicly Available SpecificationPASC PCS Access Service for Radio ControllersPB Personal BasePB Predicted and Bi-directionalPBNM Policy Based Network ManagementPBO Power Back OffPBS Personal Base StationPBX Private Branch ExchangePC Personal ComputerPC_SSN Point Code Sub-System Number

PCA Password Call AcceptancePCA Policy Group proposal on CAPCB Power Cut Back

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PCC Per Call ControlPCC Pre-activation Communications ChannelPCC Private Control ChannelPCC 1 Permanent Consultative Committee (CITEL)PCCA PCMCIA Communication Card AssociationPCCA Portable Computer Communications AssociationPCCC Parallel Concatenated Convolutional CodesPCF Personal Call Forwarding

PCF Picture Clock FrequencyPCH Paging ChannelPCI Peripheral Component InterconnectPCI Programmable Communications InterfacePCI Protocol Capability IndicatorPCIC Petroleum and Chemical Technical Conference (IEEE IAS)PCI SIG Peripheral Component Interconnect Special Interest GroupPCIA Personal Communications Industry AssociationPCL Power Line CommunicationPCM Pulse Code ModulationPCMCIA Personal Computer Memory Card International Association

PCME Packet Circuit Multiplication EquipmentPCN Personal Communications NetworkPCR Program Clock ReferencePCS Personal Communication ServicesPCSAP PCS ApplicationPCSC Personal Communications Switching CenterPCSD Personal Communications Services DescriptionPCT Pairwise Correlating TransformPD Plugfest DocumentPD Powered DevicePD Proposed Draft

PDAM Proposed Draft AmendmentPDC Personal Digital CellularPDD Post Dial DelayPDE Position Determining EntityPDE Primary Designated Engineer (UL)PDF Portable Document Formatpdf probability distribution functionPDH Plesiocronous Digital HierachyPDH Primary Digital HierachyPDL Polarization Dependent LossPDN Packet Data NetworkPDS Phase Dithering SequencePDU Protocol Data UnitPDTR Proposed Draft Technical ReportPDU-MUX Protocol Data Unit MultiplexerPDV Packet Delay VariationPE Policy Enforcement elementPE Poly EthylenePE Public Inquiry (ETSI)PEAQ Perceptual Evaluation of Audio Quality (ITU-R rec. BS.1387)PED Portable Electronic Device

PEF Proxy Element FunctionPER Packed Encoding RulesPER Parameter Error Rate

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PESQ Perceptual Evaluation of Speech QualityPEX ETSI Help Desk for ConformancePEXT Premises End CrosstalkPF Presence FunctionPFD Power-flux DensityPHB Per-Hop forwarding BehaviorPHCF Hard Polymer Clad FiberPHP Personal Handy Phone

PHS Personal Handyphone SystemPHY Physical LayerPIB Personal Information BasePIC Primary / Presubscribed Interexchange CarrierPICS Protocol Implementation Conformance StatementPID Protocol IDPIN Personal Identification NumberPIN T.30 procedural interupt negativePINS Project Initiation Notification System (TIA)PINT PSTN Interworking (IETF)PINX Private Integrated Network Exchange

PIP T.30 procedural interupt positivePISN Private Integrated Services NetworkPIXIT Profile Initialization for Test CasesPKCS Public Key Cryptography StandardsPKI Public Key InfrastructurePL Physical LayerPL Preferred LanguagePL Program LockPLAR Private Line Auto RingPLC Power Line CommunicationPLI Power Line Interference

PLL Phase Locked LoopPLMN Public Land Mobile NetworkPLMTS Public Land Mobile Telecommunications SystemPLOAM Physical Layer Operations, Administrations and MaintenancePLS Physical Layer SpecificationPLT PowerLine TelecommunicationsPM Phase ModulationPM Performance ManagementPM Processable ModePMC Packet Mode ChannelPMC Project Management Committee (ETSI)PMCC Packet Mode Channel ConnectPMCE Packet Mode Channel ElementPMCH Packet Mode Channel Call ControlPMCH Packet Mode Channel HandlerPMD Physical Media Dependent layerPMD Polarization Mode DispersionPMM Protocol Management ModulePMMS Power Measurement Modulation SessionPMP Point to MultiPointPMR Peak-to-Mean Ratio

PMS Physical Media SpecificPMS-TC Physical Media Specific - Transmission ConvergencePMT Program Management Team

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PN Project Number (TIA)PNE Production of Norms in EuropePNNI Private Network to Network InterfaceP-n-P Plug and PlayPNT Phone-line Network TransceiverPOC Points of Contact (LBC)POC Postal Operations CouncilPOC Proof-of concept

POC Public Operator's CodePOCSAG Post Office Code Standardization Advisory Group (UK)PoD Packet transport over DSLPoDSL Packet over DSLPOF Plastic Optical FiberPOF Private Operating FrequenciesPON Passive Optical NetworkPOPs Points of PresencePOS Packet-over-SONETPOTS Plain Old Telephone ServicePoV Packet over VDSL

PoV-TC Packet over VDSL - Transmission Convergence LayerPoW Poor or WorsePP Portable PartPPD Proposal Package DescriptionPPDN Public Packet Data NetworkPPI PCS to PCS InterferencePPM Parts Per MillionPPP Point-to-Point ProtocolPPPoA PPP over ATMPPPoE Point to Point Protocol over Ethernetpps pulses per second

PQ Priority QueuingPR Public RelationsPR&A Project Request and AuthorizationPRA Primary Rate AccessPRBS Pseudo-Random Bit SequencePRC Premium Rate ChargingPRC Private ChannelPRD Pseudo-Random Downstream SequencePRI Primary Rate Interface (ISDN)PRM Performance Report MessagesPRNS Pseudo Random Noise SequencePRO Planning and Reporting OfficerPROM Programmable ROMPS PCSC ISDN SwitchPS Product SafetyPSA Polled SubAddressPSAP Public Safety Answering PointPSC Picture Start CodePSD Power Spectral DensityPSDN Public Switched Data NetworkPSDS Public Switched Digital Service

PSE Power Source ElementPSE Power Sourcing EquipmentPSELFEXT Power Sum Equal Level Far-end Crosstalk

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PSI-CELP Pitch Synchronous Innovation CELPPSID Private System IDPSIDS Private System ID ServicePSK Phase Shift KeyPSN Private Switched NetworkPSNEXT Power Sum Near-end CrosstalkPSNR Peak Signal to Noise RatioPSP Public Service Profiles

PSPDN Packet Switched Public Data NetworkPSQM Perceptual Speech Quality Measure (ITU Rec. P.861)PSS1 Private Network Signaling System 1, defined by ISOPSTN Public Switched Telephone NetworkPSWG Product Safety Working Group (Trilateral)PT Portable radio TerminalPT Project Team (ETSI)PTC PictureTel Transform CoderPTCC Pex & Testing Competence Center (ETSI)PTM Packet Transfer ModePTN Public Telecommunications Network (TIPHON)

PTN Private Telecommunications OrganizationsPTNO Public Telecommunications Network Operator (TIPHON)PTO Private Telecommunications OrganizationsPTPCP Peer-To-Peer Control ProtocolsPTS Pay Terminals and SystemPTS Payphone Terminals and SystemPTS Pay Terminal SystemPTSP PNNI Topology State PacketPTT Public Telephone and TelegraphPTT Push to TalkPUA Personal User Agent

PUC Public Utilities CommissionPUM Personal User MobilityPVC Permanent Virtual CircuitPVC Poly Vinyl ChloridePWA Password AccessPWD Password (T.30)PWG Printer Work GroupPWT Personal Wireless TelecommunicationsPWT-E Personal Wireless Telecommunications - Enhanced Interoperability Standard

-Q-Q&A Question and AnswerQADM Quadrature Audio Data Modulation (VoiceSpan [TM])QAM Quadrature Amplitude ModulationQBD QoS Bearer DescriptorQC Quick ConnectQCA Quick Connect AcknowledgeQCELP Qualcomm's proprietary version of CELPQCIF Quarter CIFQ-Mode Quiescent Mode (Q4/15)QoS Quality of Service (also QOS)

QoSM Quality of Service ManagerQP Quantization Parameter (H.262)QPSK Quadrature Phase Shift Keying

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QS Quality ScalabilityQSDG Quality of Service Development GroupQSIG The signaling protocol used at the Q-interface between two switches in a private network.ECMA/ISO have defined a set of QSIG standards.QUANT Quantization parameterQUEST Quality Excellence for Suppliers of Telecommunications

-R-

R&O Report and OrderR&TTE Radio and TTE (Telecommunications Terminal Equipment) DirectiveRAB Registrar Accreditation BoardRACF Radio Access Control FunctionRACH Random Access ChannelRADIUS Remote Access Dial-In User ServerRADSL Rate-Adapting ADSLRAI Remote Alarm IndicationRAL Restricted Access LocationRAM Random Access MemoryRAM Remote Access Multiplexer (DSL Forum)

RAMA Resource Auction Multiple AccessRAN Radio Access NetworkRAND Random Challenge MemoryRAS Registration, Administration, and StatusRAS Remote Access ServerRASC Radio Access System ControllerRAST Receive And Send TerminalRATERQ Rate RequestRB Radiocommunications Bureau (ITU-R)RBAF Radio Bearer Adaptation FunctionRBB Residential BroadBand

RBER Residual Bit Error RateRBTESC Routing, Bridging, and Transfer of Emergency Service CallsRBOC Regional Bell Operating CompanyRBS Robbed-bit signalingRBW Resolution BandWidthRCC Return Channel for CableRCDD Registered Communications Distribution DesignerR-CELP Renewal CELPRCELP Residual CELPRCF Radio Control Function (T1P1)RCF RegistrationConfirmRCF Registration Control FieldRCF Remote Call ForwardingRCH Random Access ChannelRCP Radio Control ProtocolRCPC Rate Compatible Punctured ConvolutionalRD or R-D Rate DistortionRDC Remote Device ControlRDI Remote Detect Indication (VC-RDI)RDQ Rate-Distortion constrained QuantizationRDS Requirements Definition Study

REA Rural Electrification AssociationREC RECeive alarmREJ Reject

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RELP Residual Excited Linear PredictionREN Ringer Equivalence NumberREQ-MP Request Mode ProposalREQ-MR Request Mode RequestRES Radio Equipment SystemsRESNA Rehabilitation Engineering and Assistive Technology Society of North AmericaRESCAP Resource Capabilities discoveryREVAL Procedure for Evaluation of Radio Technologies for FPLMTS

RF Radio FrequencyRF Resolution Function (TIPHON)RFC Designation for an IETF StandardRFC Remote Feature ControlRFC Request for Comments (IETF)RFDB Resolution Function Data Base (TIPHON)RFER Residual Frame Error RateRFI Radio Frequency InterferenceRFI Request for InformationRFO Remote Foreign OfficeRFP Radio Fixed Parts

RFP Request for ProposalRFQ Request for QuotationRFT Remote Feeding Telecommunication (circuits)RFT-C Remote power Feeding Telecom - Current limitedRFT-V Remote power Feeding Telecom - Voltage limitedRG Residential GatewayRGB Red Green BlueRGIP Residential Gateway Internal ProtocolRH Multiple HDLC ReceiveRIP Request In ProcessRIPE Regional Internet Registry for Europe

RJ Registered JackRL Return LossRLAN Radio Local Area NetworkRLP Radio Link ProtocolsRLR Receive Loudness RatingRM Simple Facsimile ReceiveRMI Remote Method InvocationRMMIE Remote Modem Management Information ExchangeRMOA Realtime Multimedia Over ATM (ATM Forum)RM-ODP Reference Model for Open Distributed ProcessingRMP Reliable Multicast ProtocolRMS Root Mean SquareRNR Receiver Not ReadyROAMOPS Roaming Operations Task ForceROC Report on CommentsROLR Receive Objective Loudness RatingROM Read Only MemoryROP Report On ProposalsROSE Remote Operations Service Element (X.219 and X.229)ROT Receive Only TerminalRP Radio Ports

RP Reference PointsRP-AS Ringing, Pulse-Alerting SignalRPC Remote Procedure Call

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RPCU Radio Port Control UnitRPE Regular Pulse ExcitationRPF Remote Power FeedRPP Reverse-Pair PositioningRPR Reference Picture ResamplingRPS Reference Picture SelectionRPWM Rules of Procedure and Working MethodsRQV Running Quality Value

RR Resource Record (TIPHON)RR Registration RejectRRJ Registration RejectRRQ Registration RequestRRU Reduced Resolution UpdateRS Radio SystemRS Radiocommunications Sector - ITU- (CCIR)RS Reed-Solomon (code)RS Rectangular SliceRS Resolution Services (TIPHON)RSA Public Key Cryptosystem invented by Rivest, Shamir and Adleman

RSA Rural Service AreaRSDN Regional Switched Digital NetworkRSF Residential Standards ForumRSGCP Reliable Signaling Gatway Control ProtocolRSGP Reliable Signaling Gateway ProtocolRSID Residential System IdentificationRSL Reference System LabRSSI Received Signal Strength IndicationRSVP Resource Reservation Setup Protocol (IETF)RT Remote TerminalRT Round Trip

RTC Return to Control (T.4)RTCA Radio Technical Commission for AeronauticsRTCP Real-time Transport Control ProtocolRTD Round Trip DelayRT