The Acronyms
Guideedited by
Erin MaloneChris Janson
1st edition
Publisher Acknowledgement:
This is the first edition of this book. Please notify us of any acronyms we may have missed by submitting them via the form at www.ciena.com/acronymsguide. We will be happy to include them in further editions of “The Acronyms Guide”. For additional information on Ciena’s Carrier Ethernet or Optical Communications Certification programs please contact [email protected].
Table of Contents
Numerics ..........................1A .......................................1B .......................................2C .......................................3D .......................................5E .......................................7F........................................9G .....................................10H .....................................11I .......................................12J ......................................14K .....................................14L ......................................14M ....................................15N .....................................17O.....................................18P .....................................20Q.....................................22R .....................................22S......................................23T .....................................26U .....................................28V .....................................29W ....................................29X .....................................30Z......................................30
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Acronym GuideNumerics 2F Two-Fiber10 GbE 10 Gigabit Ethernet10 GFC 10 Gigabit Fibre Channel (Same as
FC1200)100G 100 Gigabits16-QAM 16 (points) Quadrature Amplitude
Modulation3D Three Dimensional3G 3rd Generation40G 40 Gigabits4C Consortium of Intel, IBM, Matsushita,
and Toshiba4F Four-Fiber5C Consortium of Intel, Sony, Matsushita,
Toshiba, and HitachiA A/D Analog-to-DigitalAAL ATM Adaptation LayerAAL0 ATM Adaptation Layer Type 0AAL1 ATM Adaptation Layer Type 1AAL2 ATM Adaptation Layer 2 TransportAAL3/4 ATM Adaptation Layer Type 3 and 4AAL5 ATM Adaptation Layer 5ABR Available Bit RateABT Advanced BiCMOS TechnologyAC Alternating Current; Administrative
Complex; Atomic ClockAC-3 Audio Coding Revision 3ACAC Actual Call Admission ControlACEG Alternating Current Equipment GroundACK AcknowledgeACL Active Control List; Access Control ListACO Alarm CutoffACQ AcquireACR Allowed Cell RateACS Automatic Channel Shutdown; Alarm
Correlation and SuppressionACSE Association Control Service ElementACSS Automatic Channel Shutdown
Suppression; Automatic Channel Shutdown State
ACT ActiveADC Analog-to-Digital Converter; Add/Drop
Coupler
ADI Asset Distribution InterfaceADM Add/Drop MultiplexerADP Actual Departure Potential; Automatic
Data ProcessingADSL Asymmetric Digital Subscriber LineADT Actual Departure Time; Automatic Data
TransmissionAE Automation Engine; Automation Envi-
ronmentAES Advanced Encryption Standard;
Application Environment SpecificAESA ATM End System Address; ATM End
Station AddressAFI Authority and Format IdentifierAFM APS Mode Mismatch FailureAGC Automatic Gain Control; Access Group
ControllerAGGR AggregateAID Access Identifier; Application IdentifierAIM Auto Image Management; Active
Inventory MapAIN Advanced Intelligent NetworkAINI ATM Inter-Network InterfaceAINS Automatic in Service StateAIR Additive Increase RateAIS Alarm Indication SignalAISDP Alarm Indication Signal Decay PeriodAISIP Alarm Indication Signal Integration
PeriodAIS-L Alarm Indication Signal - LineAIS-P Alarm Indication Signal - PathAIS-S Alarm Indication Signal - SectionAIS-V VT Alarm Indication SignalALS Automatic Laser Shutdown; Application
Layer ServiceAM Amplitude Modulation; Application
ManagerAMF APS Mode Mismatch FailureAMI Access Method Interface; Alternate
Mark InversionAMP Amplifier; AmperesAMS Asset Management System; Agent
Management SystemANSI American National Standards InstituteAO Autonomous OutputAOD Advertising on DemandAPC Angled Physical Contact
2
APD Avalanche PhotoDiodeAPI Application Program InterfaceAPS Automatic Protection SwitchingAPSBF Automatic Protection Switching Byte
FailureAPSCM Automatic Protection Switching
Channel MismatchAPSMM Automatic Protection Switching Mode
MismatchARC Alarm Reporting ControlARP Address Resolution ProtocolARPU Average Revenue per Unit (or User)AS Autonomous SystemASAP Alarm Severity Assignment ProfileASCII American Standard Code for Informa-
tion InterchangeASD Access Security DeviceASE Amplified Spontaneous Emission; Ap-
plication Service ElementASI Asynchronous Serial Interface;
Asynchronous SCSI InterfaceASIC Application-Specific Integrated CircuitASN.1 Abstract Syntax Notation OneASP Applications Service Provider; Average
Selling PriceASYNC AsynchronousAT Advanced TechnologyAT&T American Telephone and Telegraph
CompanyATA Advanced Technology AttachmentATAF ATM Test Access FunctionATAG Autonomous TagATAGSEQ Autonomous Tag SequenceATC Alarm Traffic ControllerATDMA Asynchronous Time Division Multiple
AccessA-TDMA Advanced Time Division Multiple
AccessATM Asynchronous Transfer ModeATM SAM ATM Service Access MultiplexerATMVCL ATM Virtual Channel LinkATMVPL ATM Virtual Path LinkATTN AttenuatorAU/AU-x Administrative UnitAUG Administrative Unit GroupAUI Autonomous Unit Interface
AU-n Administrative Unit nAUX AuxiliaryAVC Attribute Value ChangeAWG American Wire GaugeAWGN Additive White Gaussian Noise
B B/P BackplaneB3ZS Bipolar With 3-Zero SubstitutionB6ZS Bipolar With 6-Zero SubstitutionB8ZS Bipolar With 8-Zero SubstitutionBA Booster AmplifierBB BroadbandBBE Background Block ErrorBBER Background Block Error RatioBBE-RS Background Block Error Regenerator
Section (an SDH regenerator section error)
BC Business Continuity; BroadcastBCD Binary-Coded DecimalBCST BroadcastB-DCS Broadband Digital Cross-connect
SystemBDFB Battery Distribution Fuse Bay; Battery
Distribution Fuse BoardBE Block Error; Best EffortBECN Backward Explicit Congestion Notifica-
tionBELLCORE BELL Communications Research, Inc. BER Bit Error RateBE-RS Block Errors-Regenerative SectionBER-SD-P Path Signal Degrade BERBER-SF-P Path Signal Failure BERBERT Bit Error Rate TestBFP Back Facet Power; Basic Format PacketBGP Border Gateway ProtocolBGP4 Border Gateway Protocol, version 4BICI Broadband Inter-Carrier Interfaces;
B-ISDN Inter-carrier InterfaceBICSI Building Industry Consulting Services
InternationalBIOS Basic Input/Output SystemBIP Bit Interleaved Parity; Breaker Interface
PanelB-ISDN Broadband ISDN
3
BIT Built-In Test; Binary DigitBITS Building Integrated Timing Systembits/sym Bits per SymbolBLSR Bidirectional Line Switched RingBML Business Management LayerBNC Bayonet Neill-Concelman British
National ConnectorBOC Bell Operating CompanyBOD Bandwidth on Demand BOL Beginning of LifeBOM Bill of MaterialsBONDING Bandwidth ON Demand
Interoperability GroupBOOTP Bootstrap ProtocolBP BackplaneBPI Baseline Privacy InterfaceBPI+ Baseline Privacy Interface PlusB-PON Broadband Passive Optical NetworkBPP Backplane Protocolbps bits per secondBPSR Bidirectional Path Switched RingBPT Band Pass-ThroughBPV BiPolar ViolationsB-RAS Broadband Remote Access ServerBRI Basic Rate InterfaceBRM Backward RMBSC Board SC ConnectorBSP Board Support PackageBSS Business Support SystemBT British Telecom; Burst ToleranceBtag Beginning TagBTM Bits Termination Circuit PackBTO Build Transfer OperateBTS Business Telecom ServicesBTU/hr British Thermal Unit per hourBW BandwidthBWDM Band Wavelength Division MultiplexerBYT Total Byte Count
C C Celsius; CriticalC/I Carrier-to-Interface RatioC/N Carrier-to-Noise Ratio C2O Cable to Optic
CA Content Archived; Carrier AccessCAB Conformity Assessment BodyCAC Connection Admission Control; Call
Admission ControlCAD Computer Aided DesignCALA Central America and Latin AmericaCAM Content Addressable MemoryCANARIE Canadian Network for Advancement of
ResearchCAP Competitive Access ProviderCAPEX Capital ExpenditureCAS Channel Associated SignalingCATV Community Antenna Television; Cable
TelevisionCB, C/B Circuit BreakerCBDS Connectionless Broadband Data
ServiceCBN Common Bonding NetworkCBR Constant Bit RateCC Cross Connection; Clear Channel;
Calling CentersCCAF Call Control Agent Function, IN blockCCB Configuration Control BoardCCC Cross Connect ControllerCCC768 Cross Connect Fabric with 768x768
STS-1 capacityCCCG Cross Connection and Control GroupCCC-PC CCC Processor CardCCDF Complementary Cumulative
Distribution FunctionCCI Content Control InformationCCITT Consultative Committee on Interna-
tional Telegraphy and TelephonyCCK Complimentary Code KeyingCCW CounterclockwiseCDE Common Desktop Environment (UNIX)CDMA Code Division Multiple AccessCDP Contracted Deadline PotentialCDR Call Detail Recording; Clock and Data
RecoveryCD-ROM Compact Disc Read Only MemoryCDT Connection Dropping ThresholdCDTS Chromatic Dispersion Test SetCDV Cell Delay VariationCDVT Cell Delay Variation ToleranceCD-WO Compact Disc - Write One
4
CE Consumer ElectronicsCEA Consumer Electronics AssociationCELP Code Excited Linear PredictiveCER Cell Error Ratio; Codeword Error RationCES Circuit Emulation ServiceCEV Controlled Environmental VaultCFDM Command Frequency Division
MultiplexerCFG ConfigurationCFM Cubic Feet per MinuteCFU Cooling Fan UnitCH ChannelCHASEH Environmentally Hardened ChassisCHASYNC Chassis with SyncCI Compact Intelligence; Craft Interface;
Customer Interface; Certified IntegratorCID Circuit Identification; Craft Interface
DeviceCIF Client InterfaceCIFS Common Internet File SystemCIM Client Interface ModuleCINOT Ciena Optical Transport SystemCIT Craft Interface Terminal; Craft
Interface ToolCL Coupling Loss; ClearedCLASS Custom Local Area Signalling ServicesCLEC Competitive Local Exchange CarrierCLEI Common Language Equipment
IdentifierCLEITM Common Language Equipment
IdentifierCLFI Common Language Facility IdentifierCLI Command Line InterfaceCLIP Calling Line Identification PresentationCLIR Calling Line Identification RestrictionCLLI Common Language Location IdentifierCLNP Connectionless Network Layer ProtocolCLNS Connectionless Network ServiceCLP Cell Loss PriorityCLR Cell Loss RatioCLTP Connectionless Transport Protocolcm centimeterCM Control Module; Cable ModemCM-CLI Control Module Command Line
Interface
CME Compressed Multiplication EquipmentCMF Channel Mismatch Failure; Client
Management FrameCMIP Common Management Information
ProtocolCMIS Common Management Information
ServicesCMISE Common Management Information
Service ElementCMR Cell Misinsertion RateCMS Call Management ServerCMTS Cable Modem Termination SystemCMU Clock Multiplier UnitC-n Container C-11=1,544 Mb/s;
C-12=2,048 Mb/s; C-2=6,312 Mb/s; C-3=34,368 Mb/s and 44,736 Mb/s; C-4=139,264 Mb/s
CNIPS Core Network Integrated Planning System
CNIR Carrier-to-Noise/Ingress RatioCNMP Customer Network Management PortalCNR Carrier-to-Noise RatioCO Central OfficeCOAX Coaxial CableCOBRA Copper and Optical Broadband Re-
mote AccessCODEC Coder/DecoderCOE Central Office EquipmentCOFA Change of Frame AlignmentCOLD Central Office Layout DesignCOLL Collision CountCONDTYPE Condition TypeCONS Connection Oriented Network ServiceCOO Chief Operating OfficerCOPS Common Open Policy ServicesCORBA Common Object Request Broker
ArchitectureCOS Class of Service; Common Object
Services; CORBA Object ServicesCoS Class of ServiceCOT Central Office TerminalCOTS Commercial off the ShelfCP Circuit Pack; Control Processor;
Connection Provisioner; Call Processing; Customer Premise
CPCI Compact Peripheral Component Interconnect
5
CPD Common Path DistortionCPE Customer Premises Equipment; Cus-
tomer Provided EquipmentC-Plane Control PlaneCPLD Complex Programmable Logic DeviceCPM Cross-Phase ModulationCPRM Content Protection for Recordable
MediaCPT Channel Pass-ThroughCPTTAG Connection Termination Point TagCPU Central Processing UnitCR Circuit Reliability; Carriage Return;
Critical AlarmCRC Cyclic Redundancy CheckCRG Circuit Restoration GroupCR-LDP Constraint-based Routing Label
Distribution ProtocolCRS Cross ConnectCRT Cathode Ray TubeCRx Line Client Receive LineCS Control Sub-span; Convergence
Sublayer; CoreStreamCSA Canadian Standards AssociationCSC Command Signal and ControlCSD Core Switching DivisionCSES Consecutive Severely Errored SecondsCsh C ShellCSH Common Signal HeaderCSI Convergence Sublayer IndicatorCSM Core Switching ManagerC-SMF Conventional Single Mode FiberCSO Composite Second OrderCSP Customer Service Profile CSR Customer Service RepresentativeCS-RZ Carrier-Suppressed Return-to-ZeroCST Central Standard TimeCSU Channel Service Unit; Customer Service
UnitCSV Comma-Separated ValueCT CriticalCTAM Cable & Telecommunications
Association for MarketingCTB Composite Triple BeatCTC Common Transmit ClockCTD Cell Transfer Delay
CTG Cradle-To-GraveCTN Core Transmission NetworkCTP Connection Termination PointCTS Clear To SendCTx Line Client Transmit LineCUG Closed User GroupCV Code ViolationCV-FE Code violation - Far EndCV-L Code Violation - LineCV-P Code Violation - PathCV-PFE Code Violation - Path Far EndCV-S, CVS Code Violation - Section; Code
Violation -- Seconds CW Clockwise; Continuous Wave
D D&C Drop and ContinueD/A Digital-to-AnalogD/I Drop and InsertDAC Digital to Analog Converter; Digital
Addressable ControllerDACS Digital Access and Cross-Connect
SystemDAD Direct Access DeviceDADM Data Add/Drop MultiplexerDARPA Defense Advanced Research Projects
Agency (US)DAS Direct Attached StorageDATE Duly Authorised Telecommunications
EntitydB decibelDB DatabaseDB-9 Data Bus 9 Pin ConnectorDBA Database AdministratordBc Decibel referenced to the carrierdBm Decibel reference to milliwattsDBMS Database Management SystemDBPSK Differential Binary Phase Shift KeyingDBS Direct Broadcast SatellitedBW Decibels referenced to WattsDC Direct Current; Data ConnectionDCC Data Communications ChannelDCE Data Communications Equipment;
Data Circuit Terminating EquipmentDCF Dispersion-Compensating Fiber
6
DCG Dispersion Compensation GratingDCM Dispersion Compensation ModuleDCME Digital Compressed Multiplication
EquipmentDCMS Digital Circuit Multiplication SystemDCN Data Communication NetworkDCOM Distributed Component Object ModelDCP Digital Communications Protocol;
Device Control ProtocolDCS Digital Cross-connect System; Digital
Connection SystemDCS 1800 Digital Cellular System, GSM variant at
1800 MHzDCU Dial up Data Channel UnitDDI Direct Dialing InwardDDS Digital Data Storage; Digital Data
Service; Digital Data System; Digital Data Stream
DE Discard EligibleDEC Digital Electrical CarrierDECT Digital European Cordless Telephone/
TelecommunicationDEG Degraded SignalDEMUX DemultiplexerDENI Digital Entertainment Networking
InitiativeDENY Transaction DenierDFB Distributed FeedbackDG Disc GroupDGD Differential Group DelayDHCP Dynamic Host Configuration ProtocolDHWG Digital Home Working GroupDID Direct Inward DialerDiffServ Differentiated ServicesDIO Digital Input/OutputDIP Dual In-line Package (switch)DIR DirectionDiv DivisionDLC Digital Loop CarrierDLCI Data Link Connection IdentifierDLL Dynamic Link Library; Data Lind Layer
(driver); Downline LoadDLT Digital Linear Tape DrivesDM Degraded Minute; Dispersion
MitigationDMA Direct Memory Access
DMACS Distributed Monitoring and Control System
DMB Digital Multipoint Bridge; Document Maintenance Bulletin
DMC Dual Modem CardsDMH Degraded Modem HoursDMM Digital Multi-MeterDMOP Detailed Method of ProcedureDMS Dispersion-managed SolutionDMUX [Optical] DemultiplexerDNCS Digital Network Control SystemDNR Do Not RevertDNS Domain Name Server; Domain Name
SystemDOCSIS Data-Over-Cable Service Interface
SpecificationsDOD Department of DefenseDOS Disk Operating SystemDoS Denial of ServiceDP Distribution Point; Data ProcessingDPDT Double-Pole, Double-Throw DPFI Data Plane Fault IsolationDPI Digital Program Insertion; Dots Per InchDPR Dedicated Protection RingDPRAM Dual Port Random Access MemoryDPT Dynamic Packet TransportDQ Degraded Quality LevelDQDB Distributed Queue Dual BusDQoS Direct Memory AccessDQPSK Differential Quadrature Phase Shift
KeyingDR Disaster RecoveryDRAM Dynamic Random Access MemoryDRM Digital Rights ManagementDS Digital Signal; DownstreamDS0 Digital Service, Level 0, 64kbpsDS1 Digital Service, Level 1, 1.544 Mb/s
;Digital Signal LevelDS3 Digital Signal Level 3 (T3 equivalent)DSCP Differentiated Service Code PointDSCRDS Discard CountDSF Dispersion Shifted FiberDSI Digital Speech InterpolationDSL Digital Subscriber Line; Digital
Subscriber Loop
7
DSLAM Digital Subscriber Line Access Multiplexer
DS-n Digital Signal, level n DSP Digital Signal ProcessorDSS Direct Satellite ServicesDSS2 Digital Subscriber Signaling 2DSTB Digital Set-top BoxDSX Digital Side InterfaceDS-x Digital Signal where N denotes
multiple of 51.84 Mb/sDSX-1 Digital Signal Level 1 Cross ConnectDSX-3 Digital Signal Level 3 Cross ConnectDT Decision Technology; Direct Termina-
tionDTCP Digital Transmission Content ProtectionDTE Data Terminal EquipmentDTH Direct-to-Home, usually satellite
television broadcastingDTL Designated Transit ListDTMF Dual Tone Multiple FrequencyDTS Dynamic Transport SystemDTV Digital TelevisionDUART Dual Universal Asynchronous Receiver
TransmitterDUP Data User PartDUS Don’t Use SynchronizationDV Digital VideoDVB-ASI Digital Video Broadcast Asynchronous
Serial InterfaceDVC Dynamic Virtual ConcatenationDVD Digital Versatile DiscDVD+R Recordable Digital Versatile DiscDVD+RW Rewritable Digital Versatile DiscDVI Display Visual InterfaceDVM Digital VoltmeterDVOW Digital Voice OrderwireDVR Digital Video RecorderDW DatawireDWDM Dense Wavelength Division
MultiplexingDXC Digital Cross-ConnectDXI Data Exchange Interface
E E&M Ear & Mouth
E1 European Equivalent of T1 (2.048 Mb/s signal speed)
E2E End To EndE2PROM Electrically Erasable Programmable
Read Only MemoryE3 European data signal at a rate of
34.368 Mb/sEAI Enterprise Application IntegrationEAL Events, Alarms, and LoggingEAP Extensible Authentication ProtocolEAS Emergency Alert SystemEB Error Block; EastboundEb/No Energy per Bit to Noise ratioEC Enhanced Capacity ; European
CommissionEC-1 Electrical Carrier Level 1 (STS1
Equivalent)ECC Edge Card Control; Embedded
Communications ChannelECI Equipment Catalog ItemECLR Egress Cell Loss RatioECn Electrical Carrier, level n; 0=64 kb/s,
2=6,312 Mb/s, 3=44,736 Mb/sECN Engineering Change NoticeECO Engineering Change OrderECTRA European Committee for
Telecommunications Regulatory AffairsED Equipment DegradeEDF Erbium-Doped FiberEDFA Erbium-Doped Fiber AmplifierEDI Electronic Data InterchangeeDOCSIS Embedded Data-Over-Cable Service
Interface SpecificationsEEE Electronic Equipment EnclosureEEPROM Electrically Erasable Programmable
Read Only MemoryEF Equipment FailureEF&I Engineer, Furnish and Install EFCI Explicit Forward Congestion IndicationEFD Event Forwarding DiscriminatorEFP Equipment Fault ProtectionEH Environmentally HardenedEIA Electronic Industries Alliance; Electronic
Industries AssociationEID Equipment IdentifierEIDE Enhanced Integrated Drive Electronics
8
EII European Information InfrastructureEIR Excess Information RateEIRP Effective Isotropic Radiated Power;
Equivalent Isotropic Radiated PowerEJB Enterprise Java BeansELAN Emulated Local Area NetworkELR Extra Long ReachEM Element ManagerEMBS Egress Maximum Burst SizeEMC ElectroMagnetic CompatibilityEMD Extended Management DomainEMEA Europe, Middle East and AfricaEMG Extended Management GatewayEMI Electromagnetic InterferenceEML Element Management Layer;
Electro-Absorptive Modulated LaserEMP Expiring Maintenance Process EMS Element Management System EMT Expiring Maintenance Tool eMTA Embedded Multimedia Terminal
AdapterEMX ESCON MUXEND Extended Management DomainENE End Network ElementENUT Enhanced Non-preemptable
Unprotected TrafficEO Equipment OrderEOC Embedded Operations ChannelEoD Everything on DemandEOF End of FrameEOL End of LifeEOM End of MessageEoS Ethernet over SONET/SDHEOW Engineered Orderwire; Express
OrderwireEPA Environmental Protection AgencyEPCR Egress Peak Cell RateEPD Early Packet DiscardEPG Equipment Protection GroupEPL Ethernet Private LineEPLD Erasable Programmable Logic DeviceE-PON Ethernet Passive Optical NetworkEPR Engineering Progress ReportEPROM Erasable Programmable Read Only
Memory
EQPT EquipmentER Extended ReachERDI Enhanced Remote Defect IndicatorEREI-P Enhanced Path Remote Error IndicationErrcde Error CodeES Errored SecondESA EDFA Saturation Algorithm; End Sys-
tem AddressESCBND ESCON BundleESCON Enterprise Systems ConnectionESCR Egress Sustainable Cell RateESD Electrostatic DischargeESDS Electrostatic Discharge SensitiveESF Extended Super Frame; Extended
Superframe FormatES-FE Errored Seconds - Far EndESI End System IdentifierES-IS End System to Intermediate SystemES-L Errored Seconds - LineES-LFE Errored Second-Line Far EndESMOP Electronic Service Method of ProcedureES-MS Errored Seconds at the Mulitplexor
SectionESN Extended SubnetworkES-P Errored Seconds - PathES-PFE Errored Seconds - Path Far EndESR Errored Second RatioES-RS Errored Second Regenerator SectionES-S Errored Seconds - SectionEST Eastern Standard TimeES-V Errored Second-Virtual Tributary (VT)
Path; Errored Second-VT Path Far EndESx Errored Second CountET End TerminalEtag Ending TagETH 10/100 EthernetETHBND Ethernet BundleETLMI ESCON Trib Laser Manager InterfaceETR External Timing ReferenceETSI European Telecommunications
Standards InstituteEU European UnionEVC Ethernet Virtual CircuitEVM Error Vector MagnitudeEVPL Ethernet Virtual Private Line
9
EVPLAN Ethernet Virtual Private Local Area Network
EWO Engineering Work OrderEXER-R Exercise - RingEXER-S Exercise - Span (SONET)EXP ExperimentalEXZ Excessive Zone
F F FahrenheitF&I Furnish and InstallFA, F/A Fuse Alarm; Fault AlarmFAB Field Alert BulletinFAD Functional Access DomainFAF Facility FailureFAT Factory Acceptance TestFC Failure Code; Failure Count; Fiber
Channel; Fibre ChannelFC Switch Fibre Channel SwitchFC100 Fibre Channel 1 Gb/sFC10000 Fibre Channel 10 Gb/s (same as
10GFC) FC200 Fibre Channel 2 Gb/sFC400 Fibre Channel 4 Gb/sFCAPS Fault, Configuration, Accounting,
Performance (or Provisioning), Security management
FCC Federal Communications CommissionFC-FE Failure Count - Far EndFCIP Fibre Channel over Internet
ProtocolFC-L Failure Count - LineFC-LFE Failure Count - Line Far EndFCM Fan Control ModuleFCP Fibre Channel ProtocolFC-P Failure Count - PathFC-PFE Failure Count - Path Far EndFCS Frame Check Sequence; Fibre Channel
StandardFCS32 Count of FCS-32 ErrorFC-V Failure Count - VTFC-VFE Failure Count - VT Far EndFDD Frequency Division DuplexedFDDI Fiber Distributed Data InterfaceFDF Fiber Distributing Frame
FDL Facilities Data LinkFDM Frequency Division Multiplexing; Fast
Ethernet ; Frequency Division Modulation
FDMA Frequency Division Multiple AccessFDP Fiber Distribution PanelFDRP Frame DropFE Far End; Fast Ethernet; Forward Error
CorrectionFEAC Far End Alarm ChannelFEACT Far-End Terminal Alarm ConditionFEALM Far-End AlarmFEB Fast Ethernet BridgingFEBE Far End Block ErrorFEC Forward Error Correction; Forwarding
Equivalence ClassFECN Forward Explicit Congestion
NotificationFECS Forward Error Correction SecondsFEDS FICON Extended Storage over
DistanceFEP Front End Processor; Far End
ProtectionFEPLF Far End Protection Line FailureFEPM Far End Performance MonitorFERF Far End Receive FailureFET Field-Effect TransistorFF Fast ForwardFFA First Field ApplicationFFP Facility Fault ProtectionFFT Fast Fourier TransformFIB Forwarding Information BaseFIC Frame Identification CodeFICON Fiber ConnectionFIL Fiber in the LoopFIT Failure in TimeFITB Fiber in the BuildingFITL Fiber in the LoopFITR Fiber in the RiserFLAG Fiber Link Around the GlobeFM Fan Module; Fault Management;
Forwarding Module; Frequency Modulation
FMA Failure Modes AnalysisFMECA Failure Mode and Effects and Criticality
Analyses
10
FMS Fault Management SystemFNCS Foreign National Control SystemFO Fiber OpticsFOADM Fixed Optical Add/Drop Multiplexer;
Flexible Optical Add/Drop MultiplexerFOB Free On BoardFOC Final Operating ConfigurationFOD Free on DemandFOS Follow on Satellite, Intelsat designationFOSC Fiber Optic Splice CourseFOTS Fiber Optic Transmission SystemFOW Forward OrderWireFP Fabry-Perot (type of laser); Frame
Pulse (NEC)FPG Facility Protection GroupFPGA Field Programmable Gate ArrayFPLMTS Future Public Land Mobile
Telecommunications SystemsFPM Fan Power ModuleFPP Fast Pattern ProcessorFPS Frames per SecondFR Frame RelayFRAD Frame Relay Access DeviceFRC ForceFRD Functional Requirements Document;
Feature Requirements DefinitionFREQ FrequencyFRF Frame Relay ForumFRF.12 Frame Relay Forum Implementation
Agreement 12FRF.13 Frame Relay Forum Implementation
Agreement 13FRF.5 Frame Relay Forum Implementation
Agreement 5FRF.8.1 Frame Relay Forum Implementation
Agreement 8.1FRG Fragment CountFRM Forward Resource Management; Frame
CountFRMS Dropped FramesFRS Frame Relay ServiceFRU Field Replacement UnitFS File SystemFSA Field Service ApplicationFSAN Full Services Access Network
(consortium)
FSB Field Service BulletinFSO Free Space OpticalFS-P Forced Switch - ProtectionFS-R Forced Switch - RingFSS Fixed Satellite ServiceFS-S Forced Switch - SpanFS-W Forced Switch - WorkingFT France TelecomFT1 Fractional T1GT Gain Transfer; Grating TemperatureFTA Fault Tree AnalysisFTAM File Transfer and Access ManagementFTC Fabric and Timing CardFTM Fabric Timing ModuleFTP File Transfer ProtocolFTTB Fiber to the Building; Fiber to the
BusinessFTTC Fibre to the Curb (Kerb), linked to VDSL
in deploymentFTTD Fiber to the DeskFTTH Fiber to the HomeFTTP Fiber to the Premise; Maintenance
Channel Transparent Termination PointFTTx Fiber to the [endpoint]FUNI Frame-based User-Network InterfaceFW Firmware; FirewallFWHM Full Width at Half MaximumFWM Four-Wave MixingFXO Foreign Exchange OfficeFXS Foreign Exchange Service
G G/T Gain to System Noise Temperature
RatioGA General AvailabilityGb GigabitGB GigabyteGbE Gigabit EthernetGbE VFTP Gigabit Ethernet Virtual Facility
Termination PointGbE WAN Gigabit Ethernet Wide Area NetworkGbE WIF Gigabit Ethernet Wide Area Network
InterfaceGBIC Gigabit Interface ConverterGbit Gigabit
11
Gbps, Gbits Gigabits per secondGbytes/s Gigabytes per secondGC Gateway ControllerGCAC Generic Connection Admission ControlGCC0 General Communications Channel 0
(similar to SDH/SONET DCC)GCIT Graphical Craft Interface TerminalGCM General Control ModuleGCRA Generic Cell Rate AlgorithmGDMO Guidelines for the Definition of
Managed ObjectsGE Gigabit Ethernet; Greater than or
equal to ; General Electric Corporation
GEB Gigabit Ethernet BridgeGEO Geostationary Earth OrbitGESS General Electric Satellite ServicesGET Gigabit Ethernet TunnelingGFA Gain Flattened AmplifierGFC Generic Flow ControlGFF Gain Flattening Filter (used in EDFA)GFP Generic Framing ProcedureGFR Guaranteed Frame RateGHz Gigahertz (Billion hertz)GigE Gigabit EthernetGII Global Information InfrastructureGMDSS Global Maritime Distress and Safety
SystemGMPLS Generalized Multi-Protocol Label
SwitchingGMT Greenwich Mean Time; Grasshoppers
Made for Telecommunications (GMT fuses)
GN Gateway Network ElementGND GroundGNE Gateway Network ElementGOS Grade of ServiceGP Gateway PlatformGPI General Purpose InputGPIN General Purpose InputGPO General Purpose OutputG-PON Gigabit Passive Optical NetworkGPS Global Positioning System; Global
Positioning SatelliteGR Generic Requirement; Geographic
RedundancyGRDM Gigabit Rate Data Multiplexer
GRTES General Requirements for Transmission Equipment Specification
GSM Global System for Mobile communications, originally: Groupe Spéciale Mobile
GSO Geostationary Earth OrbitGT Gain Transfer; Grating TemperatureGTF Global Traffic Forecast (Intelsat)GTM Global Traffic Meeting (Intelsat)GTP Group Termination PointGTS General TeleSystems GroupGUI Graphical User InterfaceGW GatewayGWC Gateway Controller
H HA High AvailabilityHCSFI High-speed Central Switch Fabric
InterfaceHD High DefinitionHDB3 High Density Bipolar 3HDCP High-bandwidth Digital Content Pro-
tectionHDLC High-speed/level Data Link ControlHDMI High Definition Multimedia InterfaceHD-SDI High Definition Serial Digital InterfaceHDSF High-speed Distributed Switch FabricHDSL High-speed Digital Subscriber LineHDT Host Digital TerminalHDTV High Definition TelevisionHE HeadendHEC Header Error Control; Headend
ControllerHEM Headend ModemHEPA High Efficiency Particulate ArresterHFC Hybrid Fiber CoaxHFM High-speed Forwarding ModuleHGW Home GatewayHHP Households PassedHI Hardware/Software Interface;
Hardware-Software Integration; High Speed Internet
HISSA High Speed Serial Application Specific Integrated Circuit (ASIC)
HMS Hybrid Management Sub-layerHNv1 Home Networking Version 1
12
HO Higher OrderHOD HBO on DemandHO-DSP High Order-Domain Specific PartHO-DXC Higher Order Digital Cross ConnectHOM High-Order ModulationHomePNA Home Phoneline Networking AllianceHOP High Order PathHO-POH Higher Order - Path OverheadHOVC Higher Order Virtual ConcatenationHP Hairpin; Higher Order Path; Homes
PassedHPA High Power AmplifierHPF High Pass FilterHPNA Home Phoneline Networking AllianceHPOV Hewlett Packard Open ViewHPPI High Performance Parallel InterfaceHP-UX Hewlett Packard’s UNIX-based OS that
runs on HP’s enterprise serversHRD Hardware Release Document; Hard-
ware Requirements DocumentHS High SpeedHSB High Speed BusHSD High Speed DataHSSI High Speed Serial InterfaceHT High ThresholdHTML Hyper Text Markup LanguageHTTP Hypertext Transfer ProtocolHVAC Heating, Ventilation, and
Air-Conditioning HVS Hospitality Voice ServicesHW HardwareHz Hertz
I I/B Inbound/Outroute (also known as
the return link), from remote terminal to hub
I/O Input/OutputIAD Integrated Access Device; Interface
Access DeviceIAS Internet Access Service; Internet
Authentication ServiceIBCC In-Band Communication ChannelIBS Intelsat Business ServiceIBT International Business TravellerIC Integrated Circuit
ICB Independent Customer BuildsICD International Code DesignatorICLR Ingress Cell Loss RatioICMP Internet Control Message ProtocolICNV Input- Command Not ValidICP IMA Control ProtocolICPT Installed Circuit Pack TypeICR Initial Cell RateID Identifier; IdentificationIDB International Development BankIDE Integrated Device ElectronicsIDF Intermediate Distribution Frame;
Invalid Data FlagIDH Identification High byteIDI Initial Domain IdentifierIDL Interactive Distance Learning;
Interface Definition LanguageIDNV Input, Data Not ValidIDP Initial Domain PartIDR Intermediate Data RateIDS Intrusion Detection SystemIDT Inter-DXC TrunkIDU Indoor UnitIE Information ElementIEC Incoming Error Count;
InterExchange CarrierIEEE Institute for Electrical and
Electronics EngineersIETF Internet Engineering Task ForceIF Intermediate FrequencyIFC Initial First CostIG Information GroupIGMP Internet Group Multicast ProtocolIIAC Input - Invalid Access IdentifierIIOP CORBA Internet Inter-ORB ProtocolIISP Interim Interface Signaling ProtocolILA Intermediate Light Amplification;
Integrated Line Amplifier; In-Line Amplifier
ILEC Incumbent Local Exchange CarrierILM Integrated Laser Module;
Integrated Laser ModulatorILMI Interim Link Management Interface;
Interim Local Management Interface
ILOG Information Log; Incoming Log
13
ILR Issues List ReportIM Instant MessagingIMA Inverse Multiplexing over ATMIMBS Ingress Maximum Burst SizeIMD Intermodulation DistortionIME Interface Management EntityIMT Inter Machine TrunkIN Intelligent NetworkINAP Intelligent Network Application Part
ProtocolI-NET Institutional NetworkINM Integrated Network ManagerInroute see I/BINT Internal; Internal ClockINTAP Interoperability Technology
Association for information Processing
INTP Internodal Tunneling ProtocolIntServ Integrated ServicesINVW Invalid Word CountIOA Input/Output AdapterIOC Initial Operating ConfigurationIOF Inter-office FiberIOR Interoperable Object Reference
;Indian Ocean RegionIP Intelligent Peripheral, IN block;
Internet ProtocolIPC Inter-process Communications;
InterProcess or InterProcesser Control
IPCR Ingress Peak Cell RateIPCU DAMA IP Channel UnitIPG Inter-Packet GapIPM Interested Party MulticastIPMI Internet Protocol Multicasting
InitiativeIPMS Interested Party Multicast ServiceIPOA Internet Protocol over ATMIPPV Impulse Pay per ViewIPR Intellectual Property RightsIPsec Internet Protocol SecurityIPSL Integrated IP Software LicenseIPTA Internet Protocol Transport
AgreementIPTV IP TelevisionIPX Internet Package Exchange
IR Intermediate ReachIRD Integrated Receiver/DecoderIRT Integrated Receiver/TranscoderIS In Service; Intermediate SystemISA Industry Standard ArchitectureIS-ANR In Service - AbnormalIS-ANRST In Service - Abnormal and
RestrictedISCC InterSwitch Communications
ChannelISCR Ingress Sustainable Cell RateiSCSI Internet Small Computer System
Interface; SCSI Protocol over TCP/IP
ISD Idle Signal DetectionISDN Integrated Services Digital NetworkIS-IS Intermediate System to
Intermediate SystemISM Industrial Scientific MedicalIS-NR In Service - NormalISO International Standards
OrganizationISOC the Internet SocietyISP Internet Service Provider; Inside
PlantIS-RST In Service - RestrictedISTP Internet Signaling Transport
ProtocolISV Independent Software VendorIT Information TechnologyITA Installation, Test, and AcceptanceITC Independent Transmit ClockITE Information Technology EquipmentITL International Telecommunications
UnionITS Intelligent Transportation System;
Institute for Telecommunications Sciences
ITT International Telephone and TelegraphITU International Telecommunication UnionITU-T ITU Telecommunications standards
bodyIUC Interval Usage CodeIVPN International VPNIWF Interworking FunctionIXC Inter-exchange Carrier
14
J J0 J ZeroJ2EE Java 2 Enterprise EditionJBR Jabber CountJDBC Java Database ConnectivityJDK Java Development KitJDMK Java Dynamic Management KitJDS-HR Japan Digital Services - Half RateJEM JAVA™ Element ManagerJMS JAVA™ Messaging SystemJNDI Java Naming and Directory InterfaceJPEG Joint Photographic Experts GroupJRE Java Runtime EnvironmentJTAG Joint Test Action GroupJVM Java Virtual Machine
K k kilo (thousand)K1 SONET or SDH overhead byte of MSP/
MS-SPRing (see K2)K2 Used with K1-SONET or SDH overhead
byte for MSP/MS-SPRingKb KilobitKB KilobyteKb/s Kilobits per secondKB/s Kilobytes per secondKbit/s Kilobits per secondKbps Kilobits per secondKBps Kilobytes per secondkBPS kilo Bits Per Secondkft Kilofeet (USA cable length
measurement)kHz kilohertz (thousand hertz)Km KilometerKsh Korn Shellksym/s Kilosymbols per Secondksym/sec Kilosymbols per SecondkVA 1000 Volt AmpereskW Kilowatt
L L2TP Layer 2 Tunneling ProtocolL3 Layer 3LA Line Adapter; Latin America
LAC Local Access ConcentratorLADM Linear Add/Drop MultiplexerLAN Local Area NetworkLANE Local Area Network EmulationLAP Link Access Procedure; Link Access
ProtocolLAPB Link Access Procedure BalancedLAPD Link Access Procedure-D Channel
(X 25)LAPF Link Access Procedure for Frame-Mode
Bearer ServicesLAPS Link Access ProcedureLASER Light Amplification by Stimulated
Emission of RadiationLATA Local Access and Transport AreaLATM Local ATMLBC Laser Bias CurrentLBCL Laser Bias Current LevelLBCN Normalized Laser Bias CurrentLBO Line Build OutLC Lucent Connector; Line CardLCAP Local Craft Access PanelLCAS Link Capacity Adjustment SchemeLCC Life-Cycle cost; Link Control ChannelLCD Liquid Crystal DisplayLCL Lower Confidence LimitLCN Local Computer Network;
Logical Channel Number; Local Communications Network
LCR Least Cost RoutingLCT Large Capacity TerminalLD Laser DiodeLDAP Lightweight Directory Access ProtocolLDCC Line Data Communications ChannelLDCELP Low Delay CELPLDP Label Distribution ProtocolLDS Local Digital SwitchLEAF Large Effective Area FiberLEC Local Exchange CarrierLECS LAN Emulation Configuration ServerLED Light Emitting DiodeLEO Low Earth OrbitLER Label Edge RouterLES LAN Emulation ServerLF Line Fail
15
LFE Line Far EndLGN Logical Group NodeLGX Light-Guide CrossconnectsLH Logical HostLIC Line Interface CardLIF Line InterfaceLIM Line Interface ModuleLIP Local Information PacketLIU Line Interface UnitLLC Logical Link ControlLLSDCC Lower-Layer Section DCCLM Line ModuleLMDS Local Multipoint Distribution ServiceLMI Local Management InterfaceLMP Link Management ProtocolLNA Low Noise AmplifierLNB Low Noise Block LO Low OrderLOADM Lightweight Optical Add/Drop
MultiplexerLOC Loss of ClockLocn LocationLO-DXC Low Order Digital Cross ConnectLOF Loss of FrameLOF-P Path Loss of FrameLOH Line OverheadLOM Loss of Multiframe; List of Materials LOP Loss of PointerLOPDP Loss of Pointer Decay PeriodLOPI Loss of Pointer InhibitLOPIP Loss of Pointer Integration PeriodLOP-P Loss of Pointer - PathLOP-V VT Loss of PointerLOS Loss of SignalLOSS Loss of Signal SecondsLOVC Low-Order VCLOW Local OrderwireLP Line Processor; Lockout of Protection;
Low Order PathLport Logical portLP-S Lockout of Protection - SpanLP-S/SF-P Lockout of Protection - Span/Signal Fail
- ProtectionLR Long Reach (fiber); Line Regeneration
Equipment
LRDC Long Reach Daughter CardLSA Low Speed ADMLSB Least Significant BitLSF Loss of Signal or Frame indication
signalLSL Lower Specification LimitLSM Loss of Sync MessageLSN Logical SubnetworkLSP Label Switched Path; Local Service
ProviderLSR Label Switch RouterLSSGR LATA Switching System Generic
RequirementsLT Low Threshold; Laser TemperatureLTE Line Terminating Equipment; Long
Terminal EvolutionLTN Local Transport Network (fiber ring)LTP Link Termination Point; Logical
Termination PointLTS Loop Testing System; Long Term
StorageLU Line UnitLVD Low-Voltage DistributionLWP Low Water PeakLZS Lempel Ziv Stac
M M&C Monitor and ControlM12 MUX DS-1 into DS2M13 MUX DS-1 into DS3M23 MUX DS-2 into DS3MAC Media Access Control; Medium Access
ControlMAN Metropolitan Area NetworkMAP Main Audio Program; Mobile
Application Part ProtocolMAU Media Access UnitMb MegabitMB MegabyteMb/s Megabits per secondMB/s Megabytes per secondMbaud MegabaudMbits/s Megabits per secondMb/s Megabits per secondMb/s Megabytes per secondMb/s Million Bits Per Second
16
MBS Maximum Burst SizeMCC Master Control Center / ComputerMCP Management Control ProcessorMCPC Multiple Channels Per CarrierMCR Minimum Cell Rate; Minimum Cost
RoutingMCS Master Control StationMCT Maintenance Channel TransparencyMCTF Motion Compensated Temporal
FilteringMDF Main Distribution FrameMDU Multiple Dwelling UnitmDVR Multi-TV Digital Video RecorderME Middle EastMEA Mismatch of Equipment and AttributesMEGACO Media Gateway Control ProtocolMEO Medium Earth OrbitMER Modulation Error RatioMFR Multilink Frame RelayMG Media GatewayMGC Media Gateway ControllerMGCP Media Gateway Control ProtocolMGN Management Gateway NodeMHz Megahertz (million hertz)MIB Management Information BaseMID Message IdentifierMIPS Millions of Instructions per SecondMIT Management Information TreeMiTTs of Telecommunications TrafficMJ MajorML Mediation LayerMLMD Multiplexer/DemultiplexerMLPPP Multi-Link Point-to-Point Protocolmm millimeterMM Multimode; MultimediaMMCS Meridian Multi Media Center SwitchMME Multiwave Management ElementMMF Multi-Mode FiberMML Man Machine LanguageMMO Main Material OrderMMP Multiwave Management ElementMN MinorMNO Mobile Network OperatorMNC Multi-National Company
MO Managed ObjectMOD Module; Movies on DemandMODEM Modulator-DemodulatorModem Modulator/DemodulatorMOF Managed Object FrameworkMOP Method of ProcedureMOR Multi-wavelength Optical RepeaterMOS Mean Opinion ScoreMP Management PortalMP3 MPEG-2 Layer 3MPCKTS Multicast Packet CountMPEG Moving Pictures Expert GroupMPI Multi-Path Interface; Multi-Path
InterferenceM-Plane Management PlaneMPLmS Multi-Protocol Lambda SwitchingMPLS Multi Protocol Label SwitchingMPLS-CP MPLS Control PlaneMPN Mode Partition NoiseMPOA Multi Protocol over Asynchronous
Transfer ModeMPS Multiple Priority SystemMPT Multiplex Pass-ThroughMPT Ministry of Posts and
TelecommunicationsMPTS Multiple Program Transport StreamMR Modification Request; Material
Request; Medium ReachMRRB Maintenance Requirements Review
Board; Material Release Review Boardms MillisecondsMS Multiplex SectionMSA Mediation Services AdministratorMS-AIS Multiplex Section - Alarm Indication
SignalMSB Most Significant BitMSC Metro Shelf Controller; Microsoft
Cluster ServerMSF Multiservice Switching ForumMSN Multi-SubnetworkMSNM Metro Switching Network ManagerMSNM ML Metro Switching Network Manager
Mediation LayerMSO Multiple System OperatorMSOH Multiplexer Section Overhead
17
MSP Multiplex Section Protection; Multiservice Switching Path
MS-P Manual Switch - ProtectionMSPP Multiservice Provisioning PlatformMSPVC Management Soft Permanent Virtual
CircuitMS-R Manual Switch - RingMS-RDI Multiplex Section - Remote Defect
IndicationMS-REI Multiplex Section Remote Error
IndicationMSS Mobile Satellite ServiceMS-S Manual Switch - SpanMS-Spring/MSPR
Multiplex Section Shared Protection Ring
MST Mountain Standard Time; Multiplex Section Termination
MSTE Multiplex Section Terminating Equipment
MS-W Manual Switch - WorkingMTA Multimedia Terminal AdapterMTBF Mean Time between FailureMTIE Maximum Time Interval ErrorMTP Message Transfer PartMTTP Transparent Connection Termination
PointMTTR Mean Time to RepairMTTU Mean Time to UnderstandMTU Maximum Transmission UnitMUX MultiplexerMUXCVR MuxceivermV MillivoltMVOA Miniature Variable Optical AttenuatorMZ Mach-Zehnder
N NA No Alarm; Not Alarmed; Not
Applicable; Not Available; Numerical Aperture
NAD Network Access DomainNAP Network Access PointNAPT Network Address and Protocol |Transla-
tionNAS Network Access Server; Network
Attached Storage
NASA National Aeronautical and Space Agency (US)
NAT Network Address TranslationNBI Northbound InterfaceNBK No BackupNC Nodal Controller; Normally Closed
(contacts)NCB National Computer BoardNCC Network Control Center/ComputerNCCC Network Control Coordination ChannelNCCI Network Call Correlation IdentificationNCP Nodal Control Point; Nodal Control
ProcessorNCP&D Network Capacity Planning and
DeliveryNCR Non-Conformance ReportNCS Network Computing System; Network
Control System; Network Call SignalingNCT Network Control TerminalNCTA National Cable & Telecommunications
AssociationNDC National Destination CodeNDF New Data FlagNDIS Network Design and Inventory SystemNDMH Non-Degraded Modem HoursNDP Network Discovery Protocol; Neighbor
Discovery ProtocolNDSF Non-Dispersion Shifted FiberNDVR Network Digital Video RecordingNE Network ElementNE/FE Near End/Far EndNEBS Network Equipment Building
Standards; Network Equipment Building Systems
NEC National Electric CodeNEF Network Element FunctionNEG Negative TerminalNEID Network Element IdentificationNEIR Network Element Information RequestNEMA National Electrical Manufacturers
AssociationNFS Networked File SystemNGDLC Next Generation Digital Loop CarrierNG-L1 Next Generation Layer 1NGNA Next Generation Network Architecture
18
NGSO Non-Geostationary Earth Orbit, used as a general descriptive for LEO and MEO systems.
NGW National GatewayNI Network InterfaceNIC Network Interface CardNID Network Interface DeviceNIDU Network Interface Data UnitNII National Information Infrastructure
(for the USA, see also GII and EII)NIS Network Infrastructure SolutionsNISC National Information Services CouncilNIU Network Interface UnitNLA Network Layer Address; Network Layer
AgentNLC Node Line CardNLD Neighbor Link DiscoveryNLPI Network Layer Protocol Identifiernm nanometerNM Network Management; Network
Manager; Network Management; Node Manager
NMA Network Monitoring and AnalysisNME Network Management EthernetNMF Node-level Management FunctionNML Network Management LayerNMS Network Management SystemNN N key on keyboard for a no responseNNI Network to Network Interface;
Network Node InterfaceNNIF Network to Network InterfaceNNM Network Node ManagerNNTP Network News Transfer ProtocolNO Network Object; Normally Open
(contacts)NOC Network Operations CenterNOCC Network Operations Control CenterNPC Network Parameter ControlNPR Noise Power RatioNR No ReplyNRT Non-Real TimeNRTL Nationally Recognized Test LaboratoryNRTVBR Non Real-Time Variable Bit RateNRZ Non-Return to Zerons NanosecondNSA Non Service Affecting
NSAP Network Service Access PointNSF National Science Foundation (US)NSI Network Side InterfaceNSN Nationally Significant NumberNSP Node Switch Provider; Node Switch
ProcessorNT Window New TechnologyNTE Network Terminating EquipmentNTF No Trouble FoundNTFCNCDE Notification Codes (TL1)NTFS New Technology File SystemNTP Network Time ProtocolNTS Near Term Storage; Network Time
SynchronizationNTSC National Television Standards
CommitteeNUT Non-preemptive Unprotected TrafficNVM Non-Volatile MemoryNVRAM Nonvolatile Random Access MemoryNZDSF Non-Zero Dispersion Shifted Fiber
O O&M Operations and ManagementOA Optical AmplifierOA&M Operations Administration and
ManagementOADM Optical Add/Drop MultiplexerOAM Operations, Administration and
Maintenance OAMCell Operations, Administration and
Maintenance CellOAMP Operation, Administration,
Maintenance and Provisioning O-BLSR Optical-Bidirectional Line Switched
RingOC Optical CarrierOC-1 Optical Carrier level 1, SONET bit rate
= 51.84 Mb/s OC1 Optical Carrier level 1 (51.84 Mb/s)OC-12 Optical Carrier level 12, SONET bit rate
= 622.08 Mb/sOC-192 Optical Carrier level 192, SONET bit
rate = 9.953 Gb/s OC-3 Optical Carrier level 3, SONET bit rate
= 155.52 Mb/s
19
OC-48 Optical Carrier level 48, SONET bit rate = 2.488 Gb/s
OCAP OpenCable Application PlatformOCH Optical ChannelOCI Open Connection IndicationOC-n Optical Carrier-number; Optical Carrier
where N denotes a multiple of 51.84 Mb/s
OCT Octet CountOCTU Optical Channel Transport UnitOCXO Oven-Controlled Crystal OscillatorODA Outlet Digital AdapterODBMS Object Database Management SystemODF Optical Distribution FrameODPR Optically Dedicated Protection RingODU Outdoor UnitODUk Optical channel Data Unit where k is
1 or 2OEM Original Equipment ManufacturerOEO Optical-to-Electronic-to-OpticalOEPL Optical Ethernet Private LineOEPLAN Optical Ethernet Private Local Area
NetworkOEVPL Optical Ethernet Virtual Private LineOEVPLAN Optical Ethernet Virtual Private Local
Area NetworkOFC Open Fiber Control; Optical Fiber
CommunicationOFDM Orthogonal Frequency Division
MultiplexingOFS Out of Frame SecondOFTEL Office of Telecommunications (UK
Regulator)OID Object IdentifierOIU Operator Interface Unit; Optical
Interface Unit; Office Interface UnitOLA Optical Line Amplifier; Optical Link
AnalysisOLB Optical Link BudgetOLM Optical Link ModuleOLMP Optical Link Management ProtocolOLS Optical Line SystemOLT Optical Line Termination; Optical Line
TerminalOLTP OSRP Link Termination PointOM Optical ModuleOMC Operation and Maintenance Center
OMG Object Management GroupOMT Orthogonal Mode TransducerON Optical NetworkONE Optical Network ElementONP Open Network ProvisionONT Optical Network TerminalONU Optical Network UnitOO Optical-to-OpticalOOB Out of BandOOF Out of FrameOOK On-Off KeyingOOM1 Out of Multi Frame Stage 1OOM2 Out of Multi Frame Stage 2OOO Optical - Optical - OpticalOOR Out of RangeOOS Out of ServiceOOS-MA Out of Service-ManagementOOS-MAANR
Out of Service-Management and Abnormal
OpEx Operations ExpenditureOPM Optical Performance Monitoring;
Optical Power MeterOPR Optical Power ReceivedOPS/INE Operations Provisioning System/
Intelligent Network ElementOPT Optical Power TransmitOPTORL Optical Return LossOpUk Optical channel payload Unit where k is
1 or 2OQPSK Offset Quaternary Phase-shift KeyingORB Object Request BrokerOribital Slot
longitude position above the equator at which a satellite is located
ORIG Original; OriginatingORL Optical Return LossORP Optical Routing ProtocolOS Operating SystemOSA Optical Spectrum AnalyzerOSC Optical Supervisory Channel; Optical
Service ChannelOSDS Operations Systems Data ServerOSGI Open Services Gateway InitiativeOSHA Occupational Safety and Health ActOSI Open Systems Interconnection
20
OSM OSC Splitter ModuleOSMINE Operations Systems Modifications for
the Integration of Network ElementsOSNR Optical Signal-to-Noise Ratio; Open
Signal-to-Noise RatioOSP Optical Signaling Protocol; Outside
PlantOSPF Open Shortest Path FirstOSPR Optically Shared Protection RingOSRP Optical Signaling and Routing
ProtocolsOSS Operations Support SystemOSSAN Operations Support System Access
NodesOSS-AU Out of Service-AutonomousOSS-AUMA Out of Service-Autonomous and
ManagementOSS-AURST Out of Service-Autonomous and
RestrictedOSWF On-site Work ForceOTC Operations Technical Center; Optical
Transport CardOTDR Optical Time Domain ReflectometerOTGR Operations Technology Generic
RequirementsOTN Optical Transport NetworkOTS Optical Transport SystemOTS RPTR OTS RepeaterOTU Optical Transport UnitOUI Organizationally Unique IdentifierOUNI Optical User Network InterfaceO-UPSR Optical-Unidirectional Path Switched
RingOUSM Optical Utility Services ManagerOUSP Optical Utility Services PlatformOutbound see O/BOutroute see O/BOW Order WireOXC Optical Cross Connect
P P2P Peer to PeerP6 Pentium 6PA Port Adapter; Pre-AmplifierPA Power AmplifierPABX Private Automatic Branch Exchange
PAD Power Attenuation DevicePAMA Permanent Assignment Multiple AccessPAN Personal Area NetworkingPARP Proxy ARPPAS PanAmSatPAT Program Association TablePAX Path Adaptation and X-ConnectPB PetabytePBOR Primary-Backup Object ReplicationPPB-TE Provider Backbone Bridging -
Traffic EngineeringPBT Provider Backbone TransportPBX Private Branch ExchangePC Personal Computer; Physical Contact;
Processor CardPC Personal ComputerPCA Protection Channel AccessPCB Printed Circuit BoardPCC Processor Communication ChannelPCCA Pacific Century Corporate AccessPCG Pacific Century GroupPCI Peripheral Component InterconnectPCM Pulse Code ModulationPCMCIA Personal Computer Memory Card
Interface AdaptorPCMM PacketCable MultimediaPCN Program Change Notice; Product
Change Notice ;Personal Communications Network
PCO Pre-Conditioned OrderP-Code Product CodePCP Primary Cross-connection Point, street
cabinet/flexibility pointPCR Peak Cell RatePCS Personal Communication SystemPDA Personal Digital AssistantPDAP Power Distribution and Alarm PanelPDC Passive Dispersion CompensatorPDF Portable Document FormatPDH Pleisiochronous Digital HierarchyPDH Plesiochronous Digital HierarchyPDI Payload Defect IndicationPDL Polarization Dependent LossPDP Policy Decision PointPDU Power Distribution Unit; Protocol Data
Unit
21
PEG Public, Education, GovernmentPEM Processor Enhancement Module;
Processor Element ModulePEP Policy Enforcement PointPESQ Perceptual Evaluation of Speech
QualityPFE Path Far EndPFM Packet Forwarding ModulePFO Premium Feature OpenPG Peer Group; Protection GroupPGID Peer Group IdentifierPGL Peer Group LeaderPHY Physical Layer Device; PhysicalPIC Programmable Interrupt ControllerPID Personally Identifiable Data; Protocol
Identifier; Packet Identifier; Personal Identification
PIF Packet Interface FPGAPIN Photo Intrinsic; Positive-Intrinsic
Negative; Personal Identification Number
PING Packet Internet GroperPIP Plug-In ProvisioningPJ Pointer JustificationPL Packet LossPLC Packet Loss ConcealmentPLCN Pilot Line Change NotificationPLCP Physical Layer Convergence ProtocolPLD Programmable Logic DevicePLDT Philippines Long Distance Telephone
CompanyPLL Phase Locked LoopPLM Payload Label MismatchPLM-P Payload Label Mismatch - PathPLM-V Payload Label Mismatch - VTPLN PNNI Logical NodePLO Path Layer OverheadPM Performance Management;
Performance Monitoring; Program Manager; Project Manager
PMA Power Management AlgorithmPMBB Performance Monitoring Building BlockPMD Polarization Mode DispersionPMDC PMD CompensatorPMM Power Management ModulePMO Program Management Office
PN Pseudo Noise; physical nodePNC Physical Node ControllerPNNI Private Network-to-Network Interface;
Private Network Node InterfacePO Purchase OrderPOC Point Of ContactPOH Path OverheadPOM Project Office ManagerPON Passive Optical NetworkPOP/PoP Point of Presence, usually referring to
an Internet service provider/access point
POR Power on ResetPOS Packet over SONET; Positive TerminalPOST Power on Self TestPOTS Plain Old Telephone ServicePPC Power PCPPD Partial Packet DiscardPPJC Positive Pointer Justification CountPPL Point-to-Point LinkPPM Parts per Minute; Parts per Million;
Pulses per MillionPport Physical portPPP Point-to-Point ProtocolPPS Path Protection Switched; Pulses per
SecondPPT Power Passing TapPRB Project Review BoardPRBS Pseudo Random Bit SequencePRC Primary Reference ClockPRI Primary Rate InterfacePRNG Pseudo Random Number GeneratorsPROM Programmable Read Only MemoryPROT Protocol; ProtectionPRS Primary Reference SourcePS Power Supply; Policy Serverps/nm-km Pico-secondPSA PacketCable Service AgreementPSBF Protection Switching Byte FailurePSC Protection Switching Count; Project
Steering CommitteePSD Protection Switching DurationPSEL Presentation SuitePSI Program Specific InformationPSL Path Signal Label
22
PSM Persistent Stored ModulePSN Packet Switch Node; Packet Switched
NetworkP-SNC Permanent SNCPSQM Perceptual Speech Quality
MeasurementPSR Protection Side Regeneration; Path
Switched RingPST Primary State; Pacific Standard TimePSTN Public Switched Telephone NetworkPSU Power Supply Unit; Packet Switch UnitPT Pass-Through; Payload TypePTE Path Terminating EquipmentPTI Payload Type IndicatorPTO Private Telecommunications OperatorPTP Physical Termination Point;
Point-To-Point; Path Termination PointPTS Per Trunk SignalingPTSE PNNI Topology State ElementPTSP PNNI Topology State PacketPTT Posts, Telegraph and Telephone
company (usually a government monopoly operator)
PV Protocol ViolationPVC Permanent Virtual Circuit; Poly Vinyl
Chloride; Private Virtual CircuitPVR Personal Video RecorderPWB Printed Wire BoardPWM Pulse Width ModulationPWR Power
Q Q3 Telecommunications Management
Network (TMN) InterfaceQAM Quadrature Amplitude ModulationQL Quality LevelQMC QUICC Multichannel ControllerQoS Quality of ServiceQPM Quarterly Progress MeetingQPR Quarterly Progress ReportQPSK Quadrature Phase Shift KeyingQUICC Quad Integrated Communications Con-
trollerR R&D Research and Development;
Research and DesignR.H. Relative Humidity
R/W Read/WriteRADIUS Remote Authentication Dial-In User
ServiceRAI Remote Alarm IndicationRAID Redundant Array of Inexpensive Disk;
Redundant Array of Independent DiskRAIG Resource Availability Information GroupRAITN Regional Arab Information Technology
NetworkRAM Random Access MemoryRAN Regional Area Network; Radio Access
NetworkRASCOM Regional African Satellite
Communications OrganisationRBF Reconfigurable Blocking FilterRBM Regional Business Manager RBOC Regional Bell Operating CompanyRBW Resolution BandwidthRCC Routing Control ChannelRCV ReceiverRCVR ReceiverRDF Rate Decrease FactorRDI Remote Defect IndicationRDI-L Remote Defect Indication - LineRDI-P Remote Defect Indication - PathRED Random Early Detection; Random Early
DiscardREF ReferenceREI Remote Error IndicationREI-L Remote Error Indication - LineREI-P Remote Error Indication - PathRev. RevisionRF Radio FrequencyRFC Request for CommentRFFP Request For Final ProposalsRFI Radio Frequency Interference;
Remote Failure Indication; Request for Information
RFI-L Remote Failure Indication (detected at the line-layer)
RFI-P Remote Failure Indication(detected at the path-layer)
RFP Request for ProposalRFT Radio Frequency Transmitter used to
describe large antennas with associated receive/transmit equipment
RG Residential Gateway
23
RHC Regional Holding CompanyRIB Routing Information BaseRIN Relative Intensity NoiseRIP Routing Information ProtocolRJ Registered JackRJ-11 Registered Jack –11RKS Record Keeping ServerRMA Return Material Authorization; Replace
Material AuthorizationRMAN Recovery ManagerRMI Remote Method InvocationRMS Root Mean SquareRNR Not Ready to Receive; Remote Failure
IndicationROADM Re-configurable Optical Add/Drop
MultiplexerROC Regional Operations CenterROI Return on InvestmentROM Read Only MemoryROW Return OrderWireRPM Revolutions per MinuteRPR Resilient Packet RingRR Ready to Receive; Reverse RequestRRB Reliability Review BoardRRO Record Route ObjectRR-R Reverse Request - RingRR-S Reverse Request - SpanRS Regenerator Section; Reed-SolomonRS232 Recommended Standard –232RS-E Ring Switch - EastRSOH Regenerator Section OverheadRSP Route Switch ProcessorRSTP Resilient Spanning Tree ProtocolRST Regenerator Section TerminatingRSVP Resource Reservation ProtocolRSVP-TE Resource Reservation Protocol with
Traffic EngineeringR/W Read/WriteRS-W Ring Switch - WestRT Remote Terminal; Real TimeRTC Real-Time ClockRTI Real-Time IngestRTN Return (voltage return)RTO Recovery Time ObjectiveRTOS Real-Time Operating System
RTP Routing Table Protocol; Real-Time Transport Protocol; Routine Task Procedure
RTPS Real Time Streaming ProtocolRTRV RetrieveRTS Ready to Send;
Request to Send; Real Time Operation System
RTSP Real Time Streaming ProtocolRTT Round-trip TimeRTU Right to UseRTVBR Real-Time Variable Bit Rate TrafficRU Rack UnitRW RewindRWA Routing and Wavelength AssignmentRX ReceiveRx Line Receive LineRZ Return to ZeroRZ-DPSK Return to Zero Differential Phase Shift
KeyingS s Seconds.f. Square FootS/IMP Signal to Impulse RatioS/N Signal to Noise RatioSA Service-AffectingSAAL Signaling ATM Adaptation LayerSABLIME Product Administration System (AT&T)SAN Storage Area NetworkSAP Secondary Audio ProgramSAR Segmentation and ReassemblySARP Switching Address Resolution ProtocolSAS Severely Errored Frame and AIS
SecondsSAAS Software As A ServiceSASE Standalone SynchronizationSATA Serial AT AttachmentSATCOM Satellite Communications Satellite
CapacitySATT Synchronization, Alarms, and
Telemetry Termination SAW Surface Acoustic WaveS-band frequency bandSBLK Errored SuperblocksSBS Stimulated Brillouin Scattering
24
SBV Switched Broadcast VideoSBW Signal BandwidthSC Service Channel; Square Connector;
Shelf ControllerSCADA Supervisory Control and Data
AcquisitionSCC Serial Communications Controller;
Serial Communications ChannelsSCCI Small Computer System InterfaceSCCP Signalling Connection Control Part,
part of SS7S-CDMA Synchronous Code Division Multiple
AccessSCE Service Creation Environment, IN blockSCEP Service Creation Environment Point, IN
blockSCF Service Control Function, IN blockSCM Service Channel Modem; Sub-carrier
MultiplexingSCN Service Channel Network; Shared
Content NetworkSCP Service Control Point, IN blockSCPC Single Channel per CarrierSCR Sustainable Cell Rate; Silicon Con-
trolled RectifierSCSI Small Computer System InterfaceSCTE Society of Cable Telecommunications
EngineersSD Signal Degrade; Signal Detect;
Standard DefinitionSDA System Design AuthoritySDCC Section Data Communications ChannelSDF Service Data Function, IN blockSDH Synchronous Digital HierarchySDI Secure Digital Interface; Serial Digital
InterfaceSDL Synchronous Data Link; Synchronous
Delay LineSDLC Synchronous Data Link ControlSDMA Space Domain Multiple AccessSDMH Severely Degraded Modem HoursSDP Service Data Point, IN blockSD-P Signal Degrade - PathSD-R Signal Degrade - RingSDRAM Synchronized Dynamic Random Access
MemorySD-S Signal Degrade-Span
SDTV Standard Definition TelevisionSDU Service Data UnitSE Systems EngineerSEAL Simple and Efficient Adaptation LayerSEC SecondarySEF Severely Errored FramingSEFS Severely Errored Frame SecondsSEFS-S Severely Errored Framing Seconds -
SectionSEM Service Entitlement Manager SEMS Severely Errored Multi-frame SecondsSerDes Serializer/DeSerializerSES Severely Errored SecondsSES-L Severely Errored Seconds - LineSES-LFE Severely Errored Seconds -
Line Far EndSES-P Severely Errored Seconds - PathSES-PFE Severely Errored Seconds -
Path Far EndSESR Severely Errored Second RatioSES-RS Severely Errored Seconds -
Regenerator SectionSES-S Severely Errored Seconds - SectionSES-V Severely Errored Seconds - VTSES-VFE Severely Errored Seconds - VT Far EndSETS Synchronous Equipment Timing SourceSF Signal Failure; Super FrameSFD Start of Frame DelimiterSFF Small Form Factor (connector)SFO Sync Frequency OffsetSFP Small Form-factor PluggableSF-R Signal Failure - RingSF-S Signal Failure - SpanSG Signaling GatewaySGC Signaling Gateway Controllersh Bourne ShellSHx Shelf NumberSI Serial Interface; Service Independent ;
System IntegratorSIB Service Independent Building Block,
IN blockSIC System Integrity Control; Standard
Industrial ClassificationSID System Identification number; Source
Identifier
25
SIF SONET Interoperability Forum; Switch Interface FPGA
SIM Service Interface ModuleSIP Session Initiation ProtocolSITA Société Internationale de
Télécommunications AéronautiqueSLA Service Level AgreementSLIP Serial Line Internet ProtocolSLM Service Layer ManagerSLOSS Synchronization LossSLR Service Level ReportSM Single Mode; Switching Module; Shelf
ManagerSMAP Service Management Access Point,
IN blockSMB Small and Medium BusinessSMC Serial Management Controllers; Stan-
dard Management CommitteeSMCS Short Message Service CenterSMDS Switched Multimegabit Data ServiceSME Small and Medium Enterprise; Short
Message EntitySMF Single Mode FiberSMIR Single Mode Intermediate ReachSML Service Management LayerSMLR Single Mode Long ReachSMM Service Mediation ModuleSMON Switch MonitorSMOP Service Method of ProcedureSMP Service Management Point, IN blockSMS Service Management System, IN block;
Service Management Suite; Short Message Service
SMSC Short Message Service Centre, part of GSM messaging system
SMT Surface Mount Technology; Self-Monitoring Task
S-MTA Standalone Multimedia Terminal Adaptor
SN Service Node, IN blockSNA Systems Network ArchitectureSNC Subnetwork Connection; Subnetwork
ControllerSNCP Subnetwork Connection ProtectionSNCP/I Subnetwork Connection Protection/
Inherent monitoring
SNCP/N Subnetwork Connection Protection/Non-intrusive monitoring
SNG Satellite News GatheringSNM Switching Network ManagerSNMP Simple Network Management ProtocolSNP Sequence Number ProtectionSNR Signal-to-Noise RatioSNTP Simple Network Time ProtocolSOA Semiconductor Optical AmplifierSOF Start of FrameSOH Section Overhead; State of HealthSOHO Small Office/Home OfficeSONET Synchronous Optical Network, US
equivalent to SDHSOP Standard Operating Procedure;
Service ProviderSP Shelf Processor; Shelf Pump; Service
ProviderSPC SONET Permanent CircuitSPCN Satellite Personal Communications
NetworkSPE Synchronous Payload EnvelopeSPF Shortest Path FirstSPI Serial Peripheral Interface; Service
Provider InterfaceSPM Self-Phase ModulationSPR/SPRing Shared Protection RingSPTP Service Path Termination PointSPVC Soft Permanent Virtual Connection;
Soft Permanent Virtual CircuitSQL Structured Query LanguageSR Short Reach (fiber)SRAM Static Random Access MemorySRC/DST Source/DestinationSRD Software Release DocumentSRF Specialised Resource Function, IN
blockSRN Software Release NoticeSRS Stimulated Raman ScatteringSRTS Synchronous Residual Time StampSRVEFF Service Affecting (TL1)SS/TDMA Satellite Switched Time Division
Multiple Access, Intelsat serviceSS5 Signaling System 5SS7 Signalling System 7, supported by the
ITU-T, also known as CCITT 7
26
SSB Single SidebandSSCOP Service Specific Connection Oriented
ProtocolSSCS Service-Specific Convergence SublayerSSEL Session SelectorSSF Server Signal Failure ; Service
Switching FunctionSSL Secure Sockets LayerSSM Synchronization-Status MessagesSSMF Standard Single Mode FiberSSP Service Switching Point, IN blockSSPA Solid State Power AmplifierSST Secondary Service StateSSTUR Site-Specific Turn-Up ReportSSU Synchronization Supply Unit ;
Subscriber TerminalsST Straight Terminus; Straight TipST1 Stratum 1; Switched T1ST2 Stratum 2ST3 Stratum 3ST3E Stratum 3 EnhancedST4 Stratum 4 (Asynchronous)STB Set-Top BoxSTC Stacking and Timing CardSTE Section Terminating Equipment;
Section Terminating ElementSTII (2) Type of optical connectorSTM Synchronous Transfer Mode, or
ModuleSTM-0 Synchronous Transfer Mode level 0,
SDH bit rate = 51.84 Mb/sSTM-1 Synchronous Transfer Mode level 1,
SDH bit rate = 155.52 Mb/s STM-16 Synchronous Transfer Mode level 16,
SDH bit rate = 2488.32 Mb/sSTM-4 Synchronous Transfer Mode level 4,
SDH bit rate = 622.08 Mb/sSTM-64 Synchronous Transfer Mode level 64,
SDH bit rate = 9953.28 Mb/sSTM-n Synchronous Transport Module nSTM-nC Synchronous Transport Module of level
n concatenatedSTMX SONET/SDH Thin MultiplexerSTP Spanning Tree Protocol; Shielded
Twisted PairSTS Synchronous Transport SignalSTS-1 Synchronous Transport Signal Level 1
STS-3 Synchronous Transport Signal Level 3STS-3c Synchronous Transport Signal Level 3,
concatenatedSTS-n Synchronous Transport Signal nSTS-Nc Contiguous Concatenation of N STS-1
SPEsSTS-N-Xv Virtual Concatenation of X STS-N SPEsSTU Secure Telephone Unit; Synchronized,
Traceability Unknown; Stratum Traceability Unknown
STU-P Stratum Traceability Unknown-Provisioned
SVC Switched Virtual CircuitSVCC Switched Virtual Channel ConnectionSVOD Subscription Video on DemandSVP Secure Video ProcessorSVPC Switched Virtual Path ConnectionSW SoftwareSWCA Split Working Channel AccessSWID Software IdentifierSWOD Software ODACSSX Short Reach as in 1000Base-SXSYNC SynchronizationSYNCIO Synchronized Input/OutputSYSLOG System Log
T T1 Service or line operation at the
DS-1 rateT1 1.544 Mb/s (US orientated)T3 Digital Carrier System for DS3 SignalsTAC Transport Aggregated Circuit; Technical
Assistance CenterTACACS Terminal Access Controller Access
Control SystemsTACS Total Access Communications Systems
(Analogue)TADR Target AddressTADRMAP Target Address MapTAM Total Available MarketTAP Test Access Port; Technician Access
PortTARP Target Identifier Address Resolution
ProtocolTAS Telecommunications Authority of
SingaporeTB Terabyte
27
TBD To Be DeterminedTBOS Telemetry Byte Oriented Serial ProtocolTBUS Timing BusTC Transmission Convergence; Transport
Complex; Transport ChannelTCA Threshold Crossing Alert; Timing
Control and AccessTCBE Total Corrected Bit ErrorTCM Trellis Coded Modulation; Transport
Channel MembersTCMO Transport Complex Managed ObjectTCP Transmission Control Protocol; Trouble
Cleaning ProcedureTCP/IP Transmission Control Protocol/Internet
ProtocolTCTP Transparent Connection Termination
PointTD Traffic DirectorTDEV Time DeviationTDM Time Division MultiplexingTDMA Time Division Multiple AccessTE Terminal EquipmentTEC Thermo-Electric CoolerTED Traffic Engineering DatabaseTEI Terminal Endpoint Identifier; Terminal
Equipment IdentifierTelco Telephone CompanyTELR Talker Echo Loudness RatingTEO Telephone Equipment OrderTERM TerminationTFT Thin Film TransistorTFTP Trivial File Transfer ProtocolTG Timing GeneratorTGCP Trunking Gateway Control ProtocolTGS Time Generation SystemTHEC Corrected Type Header Error
Correction CodeTHz TeraHertz (1012 hertz)TI Terrestrial InterferenceTIA Telecommunications Industry
AssociationTID Target Identification; Terminal Identifi-
cationTIE Time Interval ErrorTIM Trace Identifier Mismatch; Transmit
Intermediate MultiplexerTIM-S Trace Identifier Mismatch - Section
TIRKS Trunk Integrated Record Keeping System
TISSA Time Space Switch Application-Specific Integrated Circuit
Hz HertzTKIP Temporal Key Integrity ProtocolTL-1 Transaction Language 1TL-1 CLI Transaction Language One,
Command Line InterfaceTLC Transport Logical ConnectionTLI Transaction Language Command Line
InterfaceTLS Transparent LAN ServicesTLSR Transoceanic Line Switched RingTLV Type-Length-ValueTM Timing Module; Transaction ManagerIN Intelligent NetworkTMC Terminal Monitor and ControlTML Telephony Markup LanguageTMN Telecommunications Management
NetworkTMO Trans Metro Optical (platform)tmout Time Outtmper Time PeriodTMUX Terminal MultiplexerTNL Ethernet TunnelingTNM Transport Network ManagementTOD Television on DemandToD Time of Day TOH Transport OverheadTOP Task Oriented Practice; Task Oriented
ProcedureTOS Type of ServiceTP Termination PointTPFI Timing Plane Fault IsolationTQM Total Quality ManagementTR Technical ReferenceTRIB TributaryTRM Technical Review MeetingtRTO TCP Retransmit TimeoutTrTOH Transparent Transport OverheadTS Time Slot; Time Stamp; Time Synchro-
nizationTSA Time Slot AssignmentTSD Transport System DivisionTSE Topology State Element
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TSEL Transport SelectorTSF Transport Signal FailureTSG Timing Signal GeneratorTSI Time Slot Interchange; Time Switch
InterchangeTSR Technical Service RepresentativeTSX Time-Space Switch ASICTTE Transparent Terminal EquipmentTTL Transistor Transistor Logic; Time to LiveTTP Trail Termination PointTTTP Transparent Trail Termination PointTU Tributary Unit; Transmission UnitTUG Tributary Unit GroupTUG-n Tributary Unit Group, level nTU-n Tributary Unit, level nTV TelevisionTVRO Television Receive Only earth stationTW TrueWave – fiber brandTWC TrueWave Classic – fiber brandTX TransmitTx Line Transmit Line
U UAE United Arab EmiratesUART Universal Asynchronous Receiver/Trans-
mitterUAS Unavailable SecondsUASL Unavailable Second Count-LineUAS-L Unavailable Seconds - LineUAS-LFE Unavailable Seconds - Line Far EndUASP Unavailable Second Count-PathUAS-P Unavailable Seconds - PathUAS-PFE Unavailable Seconds - Path Far EndUAS-RS Unavailable Seconds - Regenerator
SectionUAS-S Unavailable Seconds - SectionUAS-V Unavailable Seconds - VTUAS-VFE Unavailable Seconds - VT Far EndUAT Unavailable TimeUB Uncorrected BlockUBR Undefined Bit Rate; Unspecified
Bit RateUBRVBR Unspecified Bit Rate Variable Bit RateUC User ChannelUCBE Uncorrectable Block Error
UCD Upstream Channel DescriptorUD Unconditional DisconnectUDLR Unidirectional Link RoutingUDP User Datagram ProtocolUDR Unconditional Disconnect ResponseUEM Universal Equipment ModulesUEQ UnequippedUGC Universal Gateway CarrierUGS Unsolicited Grant ServiceUHD Ultra High DensityUHF Ultra High FrequencyUI User InterfaceUIC User Interface ClientUID User IdentifierUITS Unacknowledged Information Transfer
ServiceUL Underwriters LaboratoriesULH Ultra Long HaulULSDCC Upper Layer Section Data
Communications ChannelUMTS Universal Mobile Telecommunications
SystemUNEQ Unequipped Path; UnequippedUNEQ-P Unequipped PathUNEQ-V Unequipped VTUNEs Unbundled Network ElementsUNI User Network InterfaceUNI/UNIF User Network InterfaceUNII Unlicensed National Information
InfrastructureUOG Universal OSS GatewayUPC Ultra Physical Contact; Universal Packet
Carrier; Usage Parameter ControlUPN Universal Personal NumberUPnP Universal Plug and PlayUPS Uninterrupted Power SupplyUPSR Unidirectional Path Switched RingUPT Universal Personal TelecommunicationsURI Universal Resource IdentifierURL Universal Resource LocatorUS UpstreamUSB Universal Serial BusUSEPA United States Environmental Protection
AgencyUTC Universal Time Coordinated; Universal
Transport Carrier
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UTOPIA Universal Test and Operations Physical Interface for ATM
UTP Unprotected Termination Point; Un-shielded Twisted Pair
UV UltravioletPRI Primary Rate InterfaceUVC Universal Voice Carrier; Universal
Video Carrier
V V VoltagePSTN Public Switched Telephone NetworkV/A Video/AudioVAC Voltage Alternating CurrentVAD Voice Activity DetectionVADSL or Very high speed (Asymmetric) VDSL Digital Subscriber LineVAP Virtual Access PartitioningV-band 50/40 GHzVBI Vertical Blanking IntervalVBR Variable Bit RateVC Virtual Circuit; Virtual Channel; Virtual
Container; Virtual ConcatenationVCAT Virtual ConcatenationVCC Virtual Channel ConnectionVCG Virtual Concatenation GroupVCI Virtual Channel IdentifierVCL Virtual Channel LinkVCM Virtual Concatenation-group MemberVC-N Virtual Container Level N (N=11, 12, 2,
3, 4)VC-N-Xc Contiguous Concatenation of X Virtual
Containers at Level NVC-N-Xv Virtual Concatenation of X Virtual
containers at Level NVCO Voltage Controlled OscillatorVCR Video Cassette RecorderVCSEL Vertical Cavity Surface-Emitting LaserVCXO Voltage Controlled Crystal OscillatorVDC Volts Direct CurrentVDSL Very-high-bit-rate
Digital Subscriber LineVEC Voice Equivalent CircuitVF Virtual Fiber; Virtual FacilityVFCU Voice/FAX Channel UnitVFTP Virtual Facility Termination Point
VG Virtual GroupVGA Variable Gain AmplifierVHF Very High FrequencyVLAN Virtual Local Area NetworkVLR Very Long ReachVM Voice Mail; Virtual Memory;
Virtual MachineVME Versa Module EurocardVMM Voice/Modem ModuleVOA Variable Optical AttenuatorVOD Video on DemandVoIP Voice over Internet ProtocolVOM Volt-Ohm MeterVOQ Virtual Output QueuingVOW Voice Order WireVP Virtual PathVPC Virtual Path ConnectionVPCI Virtual Path Connection IdentifierVPG Virtual Path GroupVPI Virtual Path IdentifierVPI/VCI Combined, VPI and VCI identify a
connection on an ATM NetworkVPL Virtual Path LinkVPLS Virtual Private LAN ServiceVPN Virtual Private NetworkV-pole Vertical-poleVPS Voice Processing SystemVPSP Virtual Path Switch ProtectionVRRP Virtual Router Redundancy ProtocolVSA Virtual-Scheduling Algorithm; Vector
Signal AnalyzerVSAT Very Small Aperture TerminalVSI Vendor-Specific InformationVSR Very Short ReachVSSP Virtual Service Switching PointVT Virtual TributaryVT-100 Terminal Emulation SystemVTG Virtual Tributary GroupV-UNI Virtual User Network Interface
W W Watt; WorkingWAD Wavelength Add and DropWAN Wide Area Network
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WB Working Band; WestboundWBS Work Breakdown StructureWC Watts per channelWCA Working Channel AccessWCSS WDM Capable Switching SystemW-DCS Wideband Digital Cross-Connect
SystemWDM Wavelength Division MultiplexingWDT Watchdog timerWE Western EuropeWECA Wireless Ethernet Compatibility
AllianceWEP Wired Equivalency PrivacyWFA Workforce AutomationWFM Workforce ManagementWFQ Weighted Fair QueuingWIF Wide Area Network InterfaceWiFi Wireless FidelityWiMedia An alliance for Wireless MultimediaWLAN Wireless Local Area NetworkWLL/WiLL Wireless Local Loop, WiLL is also Mo-
torola’s WLL product line nameWM9 Windows Media Player Version 9WPA Wireless (WiFi) Protected AccessWPS Working/Protect SplitterWRED Weighted Random Early Discard;
Weighted Random Early DetectionWSS Wavelength Selective SwitchWTO World Trade OrganisationVPN Virtual Private NetworkWTR Wait to RestoreWWN World Wide NameWWW World Wide Web
X X.25 Packet Switched Communications
InterfaceXC Cross ConnectXCVR TransceiverXDSL See DSL (Digital Subscriber Line)XFP 10 Gb/s small form-factor pluggable
transceiverXML Extensible Markup LanguageXMTR TransmitterXPM Cross-Phase Modulation
Z ZAC Zero Administration ClientZWP Zero Water Peak
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Notes
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Notes
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