Telecom Full Forms

Full Forms of Telecommunications (Telecom) Terms

Telecom AcronymTelecom Full Forms
10 GbE10 Gigabit Ethernet
10 GFC10 Gigabit Fibre Channel (Same as FC1200)
3G3rd Generation
4CConsortium of Intel, IBM, Matsushita, and Toshiba
5CConsortium of Intel, Sony, Matsushita, Toshiba, and Hitachi
AALATM Adaptation Layer
AAL0ATM Adaptation Layer Type 0
AAL1ATM Adaptation Layer Type 1
AAL2ATM Adaptation Layer 2 Transport
AAL3/4ATM Adaptation Layer Type 3 and 4
AAL5ATM Adaptation Layer 5
ABRAvailable Bit Rate
ABTAdvanced BiCMOS Technology
ACAlternating Current; Administrative Complex; Atomic Clock
AC-3Audio Coding Revision 3
ACACActual Call Admission Control
ACEGAlternating Current Equipment Ground
ACLActive Control List; Access Control List
ACOAlarm Cutoff
ACRAllowed Cell Rate
ACSAutomatic Channel Shutdown; Alarm Correlation and Suppression
ACSEAssociation Control Service Element
ACSSAutomatic Channel Shutdown Suppression; Automatic Channel Shutdown State
ACTSAdvanced Communication Technology Satellite (NASA)
ADCAnalog-to-Digital Converter; Add/Drop Coupler
ADIAsset Distribution Interface
ADMAdd/Drop Multiplexer
ADPActual Departure Potential
ADSLAsymmetric Digital Subscriber Line
ADTActual Departure Time
AEAutomation Engine
AESAdvanced Encryption Standard
AESAATM End System Address
AFCAutomatic Frequency Control
AFIAuthority and Format Identifier
AFMAPS Mode Mismatch Failure
AGCAutomatic Gain Control
AIDAccess Identifier
AIMAuto Image Management; Active Inventory Map
AINIATM Inter-Network Interface
AINSAutomatic in Service State
AIRAdditive Increase Rate
AISAlarm Indication Signal
AISDPAlarm Indication Signal Decay Period
AISIPAlarm Indication Signal Integration Period
AIS-LAlarm Indication Signal – Line
AIS-PAlarm Indication Signal – Path
AIS-SAlarm Indication Signal – Section
AIS-VVT Alarm Indication Signal
ALMLED2UAlarm LED 2 RU (Online Edge Platform)
ALSAutomatic Laser Shutdown
AMAmplitude Modulation; Application Manager
AMFAPS Mode Mismatch Failure
AMIAccess Method Interface; Alternate Mark Inversion
AMMAlarm Management Module; Auxiliary Management Module
AMPSAdvanced Mobile Phones System
AMSAsset Management System
ANSIAmerican National Standards Institute
AOAutonomous Output
AODAdvertising on Demand
APCAngled Physical Contact
APDAvalanche PhotoDiode
APIApplication Program Interface
APSAutomatic Protection Switching
APSBFAutomatic Protection Switching Byte Failure
APSCMAutomatic Protection Switching Channel Mismatch
APSMMAutomatic Protection Switching Mode Mismatch
ARCAlarm Reporting Control
ARPAddress Resolution Protocol
ARPUAverage Revenue per Unit (or User)
ASAutonomous System
ASAPAlarm Severity Assignment Profile
ASCIIAmerican Standard Code for Information Interchange
ASDAccess Security Device
ASEAmplified Spontaneous Emission
ASIAsynchronous Serial Interface
AsiaPacAsia Pacific
ASICApplication-Specific Integrated Circuit
ASN.1Abstract Syntax Notation One
ASPApplications Service Provider; Average Selling Price
ATAdvanced Technology
AT&TAmerican Telephone and Telegraph Company
ATAAdvanced Technology Attachment
ATAFATM Test Access Function
ATAGAutonomous Tag
ATAGSEQAutonomous Tag Sequence
ATCAlarm Traffic Controller
ATDMAAsynchronous Time Division Multiple Access
A-TDMAAdvanced Time Division Multiple Access
ATMAsynchronous Transfer Mode
ATM SAMATM Service Access Multiplexer
ATMVCLATM Virtual Channel Link
ATMVPLATM Virtual Path Link
AU/AU-xAdministrative Unit
AUGAdministrative Unit Group
AU-nAdministrative Unit “n”
AVCAttribute Value Change
AWGAmerican Wire Gauge
AWGNAdditive White Gaussian Noise
B3ZSBipolar With 3-Zero Substitution
B6ZSBipolar With 6-Zero Substitution
B8ZSBipolar With 8-Zero Substitution
BABooster Amplifier
BBEBackground Block Error
BBERBackground Block Error Ratio
BBE-RSBackground Block Error Regenerator Section (an SDH regenerator section error)
BCBusiness Continuity
BCDBinary-Coded Decimal
B-DCSBroadband Digital Cross-connect System
BDFBBattery Distribution Fuse Bay
BEBlock Error; Best Effort
BECNBackward Explicit Congestion Notification
BELLCOREBELL Communications Research, Inc.
BERBit Error Rate
BE-RSBlock Errors-Regenerative Section
BER-SD-PPath Signal Degrade BER
BER-SF-PPath Signal Failure BER
BERTBit Error Rate Test
BFPBack Facet Power
BGPBorder Gateway Protocol
BGP4Border Gateway Protocol, version 4
BICIBroadband Inter-Carrier Interfaces; B-ISDN Inter-carrier Interface
BICSIBuilding Industry Consulting Services International
BIOSBasic Input/Output System
BIPBit Interleaved Parity
BITBuilt-In Test
BITSBuilding Integrated Timing System
bits/symBits per Symbol
BLSRBidirectional Line Switched Ring
BMLBusiness Management Layer
BNCBayonet Neill-Concelman
BOCBell Operating Company
BODBandwidth on Demand
BOLBeginning of Life
BOMBill of Materials
BONDINGBandwidth ON Demand Interoperability Group
BOOTPBootstrap Protocol
BOTBuild Operate Transfer
BPIBaseline Privacy Interface
BPI+Baseline Privacy Interface Plus
B-PONBroadband Passive Optical Network
BPPBackplane Protocol
bpsbits per second
BPSRBidirectional Path Switched Ring
BPTBand Pass-Through
BPVBiPolar Violations
B-RASBroadband Remote Access Server
BRIBasic Rate Interface
BRMBackward RM
BSCBoard SC Connector
BSPBoard Support Package
BSSBusiness Support System
BTBritish Telecom; Burst Tolerance
BtagBeginning Tag
BTMBits Termination Circuit Pack
BTSBusiness Telecom Services
BTU/hrBritish Thermal Unit per hour
BWDMBand Wavelength Division Multiplexer
BYTTotal Byte Count
CCelsius; Critical
C/ICarrier-to-Interface Ratio
C2OCable to Optic
CAContent Archived
CABConformity Assessment Body
CACConnection Admission Control; Call Admission Control
CADComputer Aided Design
CALACentral America and Latin America
CAMContent Addressable Memory
CAPCompetitive Access Provider
CAPEXCapital Expenditure
CASChannel Associated Signaling
CATVCommunity Antenna Television; Cable Television
CB, C/BCircuit Breaker
C-BAEC-Band Amplifier Equalizer
C-BAMC-Band Amplifier Monitor
CBNCommon Bonding Network
CBRConstant Bit Rate
CCCross Connection; Clear Channel
CCBConfiguration Control Board
CCCCross Connect Controller
CCC768Cross Connect Fabric with 768×768 STS-1 capacity
CCCGCross Connection and Control Group
CCC-PCCCC Processor Card
CCC-XCCCC Cross Connect Card
CCDFComplementary Cumulative Distribution Function
CCIContent Control Information
CCITTConsultative Committee on International Telegraphy and Telephony
CCKComplimentary Code Keying
CDCompact Disc; CoreDirector®; Chromatic Dispersion
CDDCoreDirector® Designer Software Tool
CDECommon Desktop Environment (UNIX)
CDECommon Desktop Environment
CDMACode Division Multiple Access
CDPContracted Deadline Potential
CDRCall Detail Recording; Clock and Data Recovery
CD-ROMCompact Disc Read Only Memory
CDTConnection Dropping Threshold
CDTSChromatic Dispersion Test Set
CDVCell Delay Variation
CDVTCell Delay Variation Tolerance
CD-WOCompact Disc – Write One
CEConsumer Electronics
CEAConsumer Electronics Association
CERCell Error Ratio; Codeword Error Ration
CESCircuit Emulation Service
CEVControlled Environmental Vault
CFMCubic Feet per Minute
CFUCooling Fan Unit
CHASEHEnvironmentally Hardened Chassis
CHASSIS-eOld Chassis Type
CHASYNCChassis with Sync
CICompact Intelligence; Craft Interface; Customer Interface; Certified Integrator
CIDCircuit Identification; Craft Interface Device
CIFClient Interface
CIFSCommon Internet File System
CIMClient Interface Module
CINOTCiena Optical Transport System
CIRCustomer Information Release
CITCraft Interface Terminal; Craft Interface Tool
CLCoupling Loss; Cleared
CLASSCustom Local Area Signaling Services
CLECCompetitive Local Exchange Carrier
CLEICommon Language Equipment Identifier
CLEITMCommon Language Equipment Identifier
CLFICommon Language Facility Identifier
CLICommand Line Interface
CLIPCalling Line Identification Presentation
CLIRCalling Line Identification Restriction
CLLICommon Language Location Identifier
CLNPConnectionless Network Layer Protocol
CLNSConnectionless Network Service
CLPCell Loss Priority
CLRCell Loss Ratio
CLTPConnectionless Transport Protocol
CMControl Module; Cable Modem
CM-CLIControl Module Command Line Interface
CMFChannel Mismatch Failure; Client Management Frame
CMIPCommon Management Information Protocol
CMISCommon Management Information Services
CMISECommon Management Information Service Element
CMOCiena Management Object
CMRCell Misinsertion Rate
CMSCall Management Server
CMTSCable Modem Termination System
CMUClock Multiplier Unit
C-nContainer 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
CNIPSCore Network Integrated Planning System
CNIRCarrier-to-Noise/Ingress Ratio
CNMPCustomer Network Management Portal
CNRCarrier-to-Noise Ration
COCentral Office
COADMConfigurable Optical Add/Drop Multiplexer
COBRACopper and Optical Broadband Remote Access
COECentral Office Equipment
COFAChange of Frame Alignment
COLDCentral Office Layout Design
COLLCollision Count
COMCiena’s inter-processor communications system
CONDTYPECondition Type
CONSConnection Oriented Network Service
COOChief Operating Officer
COPSCommon Open Policy Services
CORBACommon Object Request Broker Architecture
CoSClass of Service
COSClass of Service; Common Object Services
COTCentral Office Terminal
COTSCommercial off the Shelf
CPCircuit Pack; Control Processor; Connection Provisioner; Call Processing; Customer Premise
CPCICompact Peripheral Component Interconnect
CPDCommon Path Distortion
CPECustomer Premises Equipment; Customer Provided Equipment
C-PlaneControl Plane
CPLDComplex Programmable Logic Device
CPMCross-Phase Modulation
CPRMContent Protection for Recordable Media
CPTChannel Pass-Through
CPTTAGConnection Termination Point Tag
CPUCentral Processing Unit
CRCircuit Reliability; Carriage Return; Critical Alarm
CRCCyclic Redundancy Check
CRGCircuit Restoration Group
CRIPCIENA Routing Information Protocol
CR-LDPConstraint-based Routing Label Distribution Protocol
CRSCross Connect
CRTCathode Ray Tube
CRx LineClient Receive Line
CSControl Sub-span; Convergence Sublayer; CoreStream
CSACanadian Standards Association
CSDCore Switching Division
CSESConsecutive Severely Errored Seconds
CshC Shell
CSHCommon Signal Header
CSIConvergence Sublayer Indicator
CSMCore Switching Manager
C-SMFConventional Single Mode Fiber
CSOComposite Second Order
CSPCustomer Service Profile
CSRCustomer Service Representative
CS-RZCarrier-Suppressed Return-to-Zero
CSTCentral Standard Time
CSUChannel Service Unit; Customer Service Unit
CSVComma-Separated Value
CtagCorrelation Tag
CTAMCable & Telecommunications Association for Marketing
CTBComposite Triple Beat
CTCCommon Transmit Clock
CTDCell Transfer Delay
CTMCore Transport Manager
CTNCore Transmission Network
CTPConnection Termination Point
CTSClear To Send
CTx LineClient Transmit Line
CUGClosed User Group
CVCode Violation
CV-FECode violation – Far End
CV-LCode Violation – Line
CV-PCode Violation – Path
CV-PFECode Violation – Path Far End
CV-S, CVSCode Violation – Section; Code Violation — Seconds
CWClockwise; Continuous Wave
CWDMCoarse Wave Division Multiplexing; Coarse Wavelength Division Multiplex
CWDM-UCoarse Wavelength Division Multiplexing – UPSR
D&CDrop and Continue
D/IDrop and Insert
DACDigital to Analog Converter; Digital Addressable Controller
DACSDigital Access and Cross-Connect System
DADDirect Access Devise
DADMData Add/Drop Multiplexer
DASDirect Attached Storage
DATEDuly Authorised Telecommunications Entity
DB-9Data Bus 9 Pin Connector
DBADynamic Bandwidth Assignment
dBcDecibel referenced to the carrier
dBmDecibel reference in milliwatts
DBMSDatabase Management System
DBPSKDifferential Binary Phase Shift Keying
DBSDirect Broadcast Satellite
DCDirect Current; Data Connection
DCCData Communications Channel
DCEData Communications Equipment; Data Circuit Terminating Equipment
DCFDispersion-Compensating Fiber
DCGDispersion Compensation Grating
DCMDispersion Compensation Module
DCMEDigital Compressed Multiplication Equipment
DCNData Communication Network
DCOMDistributed Component Object Model
DCPDigital Communications Protocol; Device Control Protocol
DCSDigital Cross-connect System; Digital Connection System
DDIDirect Dialing Inward
DDSDigital Data Storage; Digital Data Service; Digital Data System; Digital Data Stream
DEDiscard Eligible
DECDigital Electrical Carrier
DEGDegraded Signal
DENIDigital Entertainment Networking Initiative
DENYTransaction Denier
DFBDistributed Feedback
DGDisc Group
DGDDifferential Group Delay
DHCPDynamic Host Configuration Protocol
DHWGDigital Home Working Group
DIDDirect Inward Dialing
DiffServDifferentiated Services
DIODigital Input/Output
DIPDual In-line Package (switch)
DLCDigital Loop Carrier
DLCIData Link Connection Identifier
DLLDynamic Link Library; Data Lind Layer (driver); Downline Load
DLTDigital Linear Tape Drives
DMDegraded Minute; Dispersion Mitigation
DMADirect Memory Access
DMACSDistributed Monitoring and Control System
DMBDigital Multipoint Bridge; Document Maintenance Bulletin
DMCDual Modem Cards
DMHDegraded Modem Hours
DMMDigital Multi-Meter
DMOPDetailed Method of Procedure
DMSDispersion-managed Solution
DMUX[Optical] Demultiplexer
DNData Node
DNCSDigital Network Control System
DNRDo Not Revert
DNSDomain Name Server; Domain Name System
DOCSISData-Over-Cable Service Interface Specifications
DOSDisk Operating System
DoSDenial of Service
DPData Processing
DPDTDouble-Pole, Double-Throw
DPFIData Plane Fault Isolation
DPIDigital Program Insertion
DPRDedicated Protection Ring
DPRAMDual Port Random Access Memory
DPTDynamic Packet Transport
DQDegraded Quality Level
DQDBDistributed Queue Dual Bus
DQoSDynamic Quality of Service; Deploying Quality of Service
DQPSKDifferential Quadrature Phase Shift Keying
DRDisaster Recovery
DRAMDynamic Random Access Memory
DRMDigital Rights Management
DSDigital Signal; Downstream
DS0Digital Signal Level 0 (64 Kb/s data/voice channel)
DS1Digital Signal Level 1 (T1 equivalent)
DS3Digital Signal Level 3 (T3 equivalent)
DSCPDifferentiated Service Code Point
DSCRDSDiscard Count
DSFDispersion Shifted Fiber
DSLDigital Subscriber Line; Digital Subscriber Loop
DSLAMDigital Subscriber Line Access Multiplexer
DS-nDigital Signal, level n
DSPDigital Signal Processor
DSSDirect Satellite Services
DSS2Digital Subscriber Signaling 2
DSTBDigital Set-top Box
DSXDigital Side Interface
DS-xDigital Signal where N denotes multiple of 51.84 Mb/s
DSX-1Digital Signal Level 1 Cross Connect
DSX-3Digital Signal Level 3 Cross Connect
DTDecision Technology; Direct Termination
DTCPDigital Transmission Content Protection
DTEData Terminal Equipment
DTLDesignated Transit List
DTMFDual Tone Multi-Frequency
DTSDynamic Transport System
DTVDigital Television
DUARTDual Universal Asynchronous Receiver Transmitter
DUPData User Part
DUSDon’t Use Synchronization
DVDigital Video
DVB-ASIDigital Video Broadcast Asynchronous Serial Interface
DVCDynamic Virtual Concatenation
DVDDigital Versatile Disc
DVD+RRecordable Digital Versatile Disc
DVD+RWRewritable Digital Versatile Disc
DVIDisplay Visual Interface
DVMDigital Voltmeter
DVOWDigital Voice Orderwire
DVRDigital Video Recorder
DWDMDense Wavelength Division Multiplexing
DXCDigital Cross-Connect
DXIData Exchange Interface
E1European Equivalent of T1 (2.048 Mb/s signal speed)
E2EEnd To End
E2PROMElectrically Erasable Programmable Read Only Memory
E3European data signal at a rate of 34.368 Mb/s
EAIEnterprise Application Integration
EALEvents, Alarms, and Logging
EAPExtensible Authentication Protocol
EASEmergency Alert System
EBError Block; Eastbound
EBEMEnhanced Bus Extender Module
EC-1Electrical Carrier Level 1 (STS1 Equivalent)
ECCEdge Card Control; Embedded Communications Channel
ECIEquipment Catalog Item
ECLREgress Cell Loss Ratio
ECnElectrical Carrier, level n; 0=64 kb/s, 2=6,312 Mb/s, 3=44,736 Mb/s
ECNEngineering Change Notice
ECOEngineering Change Order
EDEquipment Degrade
EDFErbium-Doped Fiber
EDFAErbium-Doped Fiber Amplifier
eDOCSISEmbedded Data-Over-Cable Service Interface Specifications
EEEElectronic Equipment Enclosure
EEPROMElectrically Erasable Programmable Read Only Memory
EFEquipment Failure
EF&IEngineer, Furnish and Install
EFCIExplicit Forward Congestion Indication
EFDEvent Forwarding Discriminator
EFECEnhanced Forward Error Correction
EFPEquipment Fault Protection
EHEnvironmentally Hardened
EIAElectronic Industries Alliance; Electronic Industries Association
EIDEquipment Identifier
EIDEEnhanced Integrated Drive Electronics
EIRPEffective Isotropic Radiated Power
EJBEnterprise Java Beans
ELANEmulated Local Area Network
ELRExtra Long Reach
EMElement Manager
EMBSEgress Maximum Burst Size
EMCElectroMagnetic Compatibility
EMDExtended Management Domain
EMEAEurope, Middle East and Africa
EMGExtended Management Gateway
EMIElectromagnetic Interference
EMLElement Management Layer; Electro-Absorptive Modulated Laser
EMPExpiring Maintenance Process
EMSElement Management System
EMTExpiring Maintenance Tool
eMTAEmbedded Multimedia Terminal Adapter
ENDExtended Management Domain
ENEEnd Network Element
ENUTEnhanced Non-preemptable Unprotected Traffic
EOEquipment Order
EOCEmbedded Operations Channel
EoDEverything on Demand
EOFEnd of Frame
EOLEnd of Life
EOMEnd of Message
EoSEthernet over SONET/SDH
EOWEngineered Orderwire; Express Orderwire
EPAEnvironmental Protection Agency
EPCREgress Peak Cell Rate
EPDEarly Packet Discard
EPGEquipment Protection Group
EPLEthernet Private Line
EPLDErasable Programmable Logic Device
E-PONEthernet Passive Optical Network
EPROMErasable Programmable Read Only Memory
ERExtended Reach
ERDIEnhanced Remote Defect Indicator
EREI-PEnhanced Path Remote Error Indication
ErrcdeError Code
ESErrored Second
ESAEDFA Saturation Algorithm; End System Address
ESCONEnterprise System Connection; IBM Enterprise systems connection protocol
ESCREgress Sustainable Cell Rate
ESDElectrostatic Discharge
ESDSElectrostatic Discharge Sensitive
ESFExtended Super Frame; Extended Superframe Format
ES-FEErrored Seconds – Far End
ESIEnd System Identifier
ES-ISEnd System to Intermediate System
ES-LErrored Seconds – Line
ES-LFEErrored Second-Line Far End
ESMOPElectronic Service Method of Procedure
ES-MSErrored Seconds at the Mulitplexor Section
ESNExtended Subnetwork
ES-PErrored Seconds – Path
ES-PFEErrored Seconds – Path Far End
ESRErrored Second Ratio
ES-RSErrored Second Regenerator Section
ES-SErrored Seconds – Section
ESTEastern Standard Time
ES-VErrored Second-Virtual Tributary (VT) Path; Errored Second-VT Path Far End
ESxErrored Second Count
ETEnd Terminal; Entitlement Tracker
EtagEnding Tag
ETH10/100 Ethernet
ETHBNDEthernet Bundle
ETLMIESCON Trib Laser Manager Interface
ETRExternal Timing Reference
ETSIEuropean Telecommunications Standards Institute
EUEuropean Union
EVMError Vector Magnitude
EVPLEthernet Virtual Private Line
EVPLANEthernet Virtual Private Local Area Network
EWOEngineering Work Order
EXER-RExercise – Ring
EXER-SExercise – Span (SONET)
EXZExcessive Zone
F&IFurnish and Install
FA, F/AFuse Alarm; Fault Alarm
FABField Alert Bulletin
FADFunctional Access Domain
FAFFacility Failure
FATFactory Acceptance Test
FCFailure Code; Failure Count; Fiber Channel; Fibre Channel
FC SwitchFiber Channel Switch
FC100Fibre Channel 1 Gb/s
FC10000Fibre Channel 10 Gb/s (same as 10GFC)
FC200Fibre Channel 2 Gb/s
FC400Fibre Channel 4 Gb/s
FCAPSFault, Configuration, Accounting, Performance (or Provisioning), Security management
FCCFederal Communications Commission
FC-FEFailure Count – Far End
FCIPFiber Channel over Internet Protocol
FC-LFailure Count – Line
FC-LFEFailure Count – Line Far End
FCMFan Control Module
FCPFiber Channel Protocol
FC-PFailure Count – Path
FC-PFEFailure Count – Path Far End
FCSFrame Check Sequence
FCS32Count of FCS-32 Error
FC-VFailure Count – VT
FC-VFEFailure Count – VT Far End
FDAFood and Drug Administration
FDDFrequency Division Duplexed
FDDIFiber Distributed Data Interface
FDFFiber Distributing Frame
FDLFacilities Data Link
FDMFrequency Division Multiplexing; Fast Ethernet
FDMAFrequency Division Multiple Access
FDPFiber Distribution Panel
FDRPFrame Drop
FEFar End; Fast Ethernet; Forward Error Correction
FEACFar End Alarm Channel
FEACTFar-End Terminal Alarm Condition
FEALMFar-End Alarm
FEBFast Ethernet Bridging
FEBEFar End Block Error
FECForward Error Correction; Forwarding Equivalence Class
FECNForward Explicit Congestion Notification
FECSForward Error Correction Seconds
FEDSFICON Extended Storage over Distance
FEPFar End Protection
FEPLFFar End Protection Line Failure
FEPMFar End Performance Monitor
FERFFar End Receive Failure
FETField-Effect Transistor
FFFast Forward
FFAFirst Field Application
FFPFacility Fault Protection
FFTFast Fourier Transform
FIBForwarding Information Base
FICFrame Identification Code
FICONFiber Connection
FILFiber in the Loop
FITFailure in Time
FITBFiber in the Building
FITLFiber in the Loop
FITRFiber in the Riser
FLAGFibre Link Around the Globe
FMFan Module; Fault Management; Forwarding Module; Frequency Modulation
FMAFailure Modes Analysis
FMECAFailure Mode and Effects and Criticality Analyses
FMSFault Management System
FOFiber Optics
FOADMFixed Optical Add/Drop Multiplexer; Flexible Optical Add/Drop Multiplexer
FOBFree On Board
FODFree on Demand
FOSCFiber Optic Splice Course
FOTSFiber Optic Transmission System
FPFabry-Perot (type of laser); Frame Pulse (NEC)
FPGFacility Protection Group
FPGAField Programmable Gate Array
FPMFan Power Module
FPPFast Pattern Processor
FPSFrames per Second
FRFrame Relay
FRDFunctional Requirements Document; Feature Requirements Definition
FRFFrame Relay Forum
FRF.12Frame Relay Forum Implementation Agreement 12
FRF.13Frame Relay Forum Implementation Agreement 13
FRF.5Frame Relay Forum Implementation Agreement 5
FRF.8.1Frame Relay Forum Implementation Agreement 8.1
FRGFragment Count
FRMForward Resource Management; Frame Count
FRMSDropped Frames
FRUField Replacement Unit
FSFile System
FSAField Service Application
FSANFull Services Access Network (consortium)
FSBField Service Bulletin
FSOFree Space Optical
FS-PForced Switch – Protection
FS-RForced Switch – Ring
FSSFixed Satellite Service
FS-SForced Switch – Span
FS-WForced Switch – Working
FT-2000SONET OC-48 lightwave system (AT&T)
FTAFault Tree Analysis
FTAMFile Transfer and Access Management
FTCFabric and Timing Card
FTMFabric Timing Module
FTPFile Transfer Protocol
FTTBFiber to the Building; Fiber to the Business
FTTCFiber to the Curb
FTTDFiber to the Desk
FTTHFiber to the Home
FTTPFiber to the Premise; Maintenance Channel Transparent Termination Point
FTTxFiber to the [endpoint]
FUNIFrame-based User-Network Interface
FWFirmware; Firewall
FWHMFull Width at Half Maximum
FWMFour-Wave Mixing
GAGeneral Availability
GbEGigabit Ethernet
GbE VFTPGigabit Ethernet Virtual Facility Termination Point
GbE WANGigabit Ethernet Wide Area Network
GbE WIFGigabit Ethernet Wide Area Network Interface
GBICGigabit Interface Converter
Gbps, GbitsGigabits per second
Gbytes/sGigabytes per second
GCGateway Controller
GCACGeneric Connection Admission Control
GCC0General Communications Channel 0 (similar to SDH/SONET DCC)
GCITGraphical Craft Interface Terminal
GCMGeneral Control Module
GCRAGeneric Cell Rate Algorithm
GDMOGuidelines for the Definition of Managed Objects
GEGigabit Ethernet; Greater than or equal to
GEBGigabit Ethernet Bridge
GEO or GSOGeostationary Earth Orbit
GETGigabit Ethernet Tunneling
GFAGain Flattened Amplifier
GFCGeneric Flow Control
GFFGain Flattening Filter (used in EDFA)
GFPGeneric Framing Procedure
GFRGuaranteed Frame Rate
GHzGigahertz; One billion cycles per second
GMPLSGeneralized Multi-Protocol Label Switching
GMTGreenwich Mean Time; Grasshoppers Made for Telecommunications (GMT fuses)
GNGateway Network Element
GNEGateway Network Element
GOSGrade of Service
GPGateway Platform
GPIGeneral Purpose Input
GPINGeneral Purpose Input
GPOGeneral Purpose Output
G-PONGigabit Passive Optical Network
GPRSGeneral Packet Radio Service
GPSGlobal Positioning System; Global Positioning Satellite
GRGeneric Requirement; Geographic Redundancy
GRDMGigabit Rate Data Multiplexer
GRTESGeneral Requirements for Transmission Equipment Specification
GSMGlobal System for Mobile communication
GTGain Transfer; Grating Temperature
GTGain Transfer; Grating Temperature
GTPGroup Termination Point
GUIGraphical User Interface
GWCGateway Controller
HAHigh Availability
HCFMHigh-speed Cell Forwarding Module
HCSFIHigh-speed Central Switch Fabric Interface
HDHigh Definition
HDB3High Density Bipolar 3
HDCPHigh-bandwidth Digital Content Protection
HDLCHigh-speed/level Data Link Control
HDMIHigh Definition Multimedia Interface
HD-SDIHigh Definition Serial Digital Interface
HDSFHigh-speed Distributed Switch Fabric
HDSLHigh-Speed Digital Subscriber Line
HDTHost Digital Terminal
HDTVHigh Definition Television
HECHeader Error Control; Headend Controller
HEMHeadend Modem
HEPAHigh Efficiency Particulate Arrester
HFCHybrid Fiber Coax
HFMHigh-speed Forwarding Module
HGWHome Gateway
HHPHouseholds Passed
HIHardware/Software Interface; Hardware-Software Integration; High Speed Internet
HISSAHigh Speed Serial Application Specific Integrated Circuit (ASIC)
HMSHybrid Management Sub-layer
HNv1Home Networking Version 1
HOHigher Order
HODHBO on Demand
HO-DSPHigh Order-Domain Specific Part
HO-DXCHigher Order Digital Cross Connect
HOMHigh-Order Modulation
HomePNAHome Phoneline Networking Alliance
HOPHigh Order Path
HO-POHHigher Order – Path Overhead
HOVCHigher Order Virtual Concatenation
HPHairpin; Higher Order Path; Homes Passed
HPFHigh Pass Filter
HPFMHigh-speed Packet Forwarding Module
HPNAHome Phoneline Networking Alliance
HPOVHewlett Packard Open View
HP-UXHewlett Packard’s UNIX-based OS that runs on HP’s enterprise servers
HRDHardware Release Document; Hardware Requirements Document
HSHigh Speed
HSBHigh Speed Bus
HSDHigh Speed Data
HSSIHigh Speed Serial Interface
HTHigh Threshold
HTMLHyper Text Markup Language
HTTPHypertext Transfer Protocol
HVACHeating, Ventilation, and Air-Conditioning
IADIntegrated Access Device; Interface Access Device
IASInternet Access Service; Internet Authentication Service
IBCCIn-Band Communication Channel
ICIntegrated Circuit
ICBIndependent Customer Builds
ICDInternational Code Designator
ICLRIngress Cell Loss Ratio
ICMPInternet Control Message Protocol
ICNVInput- Command Not Valid
ICPIMA Control Protocol
ICPTInstalled Circuit Pack Type
ICRInitial Cell Rate
IDIdentifier; Identification
IDEIntegrated Device Electronics
IDFIntermediate Distribution Frame; Invalid Data Flag
IDHIdentification High byte
IDIInitial Domain Identifier
IDLInterface Definition Language
IDNVInput- Data Not Valid
IDPInitial Domain Part
IDSIntrusion Detection System
IDTInter-DXC Trunk
IEInformation Element
IECIncoming Error Count; InterExchange Carrier
IEEEInstitute of Electrical and Electronics Engineers
IETFInternet Engineering Task Force
IFIntermediate Frequency
IFCInitial First Cost
IGInformation Group
IGMPInternet Group Multicast Protocol
IIACInput – Invalid Access Identifier
IIOPCORBA Internet Inter-ORB Protocol
IISPInterim Interface Signaling Protocol
ILAIntermediate Light Amplification; Integrated Line Amplifier; In-Line Amplifier
ILECIncumbent Local Exchange Carrier
ILMIntegrated Laser Module; Integrated Laser Modulator
ILMIInterim Link Management Interface; Interim Local Management Interface
ILOGInformation Log; Incoming Log
ILRIssues List Report
IMInstant Messaging
IMAInverse Multiplexing over ATM
IMBSIngress Maximum Burst Size
IMDIntermodulation Distortion
IMEInterface Management Entity
IMTInter Machine Trunk
INIntelligent Network
I-NETInstitutional Network
INMIntegrated Network Manager
INMSIntegrated Network Management Suite; Integrated Network Management System
INTInternal; Internal Clock
INTAPInteroperability Technology Association for information Processing
INTPInternodal Tunneling Protocol
IntServIntegrated Services
INVWInvalid Word Count
IOAInput/Output Adapter
IOFInter-office Fiber
IORInteroperable Object Reference
IPInternet Protocol
IPCInter-process Communications; InterProcess or InterProcesser Control
IPCRIngress Peak Cell Rate
IPGInter-Packet Gap
IPMInterested Party Multicast
IPMSInterested Party Multicast Service
IPOAInternet Protocol over ATM
IPPVImpulse Pay per View
IPsecInternet Protocol Security
IPTAInternet Protocol Transport Agreement
IPTVIP Television
IRIntermediate Reach
IRDIntegrated Receiver/Decoder
IRTIntegrated Receiver/Transcoder
ISIn Service; Intermediate System
ISAIndustry Standard Architecture
IS-ANRIn Service – Abnormal
IS-ANRSTIn Service – Abnormal and Restricted
ISCCInterSwitch Communications Channel
ISCRIngress Sustainable Cell Rate
iSCSIInternet Small Computer System Interface; SCSI Protocol over TCP/IP
ISDIdle Signal Detection
ISDNIntegrated Services Digital Network
IS-ISIntermediate System to Intermediate System
ISMIndustrial Scientific Medical
IS-NRIn Service – Normal
ISOInternational Standards Organization
ISPInternet Service Provider; Inside Plant
IS-RSTIn Service – Restricted
ISTPInternet Signaling Transport Protocol
ISVIndependent Software Vendor
ITInformation Technology
ITAInstallation, Test, and Acceptance
ITCIndependent Transmit Clock
ITEInformation Technology Equipment
ITLInternational Telecommunications Union
ITSIntelligent Transportation System; Institute for Telecommunications Sciences
ITTInternational Telephone and Telegraph
ITUInternational Telecommunication Union
ITU-TInternational Telecommunications Union – Telecommunications Standards Section
IUCInterval Usage Code
IWFInterworking Function
IXCInter-exchange Carrier
J0J Zero; Section trace byte in performance monitoring (J-zero)
J2EEJava 2 Enterprise Edition
JBRJabber Count
JDBCJava Database Connectivity
JDKJava Development Kit
JDMKJava Dynamic Management Kit
JEMJAVA™ Element Manager
JMSJAVA™ Messaging System
JNDIJava Naming and Directory Interface
JPEGJoint Photographic Experts Group
JREJava Runtime Environment
JTAGJoint Test Action Group
JVMJava Virtual Machine
K1SONET or SDH overhead byte of VLSR or MSP/MS-SPRing (see K2)
K2Used with K1-SONET or SDH overhead byte for VLSR or MSP/MS-SPRing
Kb/sKilobits per second
KB/sKilobytes per second
Kbit/sKilobits per second
KbpsKilobits per second
KBpsKilobytes per second
KshKorn Shell
ksym/sKilosymbols per Second
ksym/secKilosymbols per Second
kVA1000 Volt Amperes
L2TPLayer 2 Tunneling Protocol
L3Layer 3
LALine Adapter
LACLocal Access Concentrator
LADMLinear Add/Drop Multiplexer
LANLocal Area Network
LANELocal Area Network Emulation
LAPLink Access Procedure; Link Access Protocol
LAPBLink Access Procedure Balanced
LAPDLink Access Procedure-D Channel (X 25)
LAPFLink Access Procedure for Frame-Mode Bearer Services
LAPSLink Access Procedure
LASERLight Amplification by Stimulated Emission of Radiation
LATALocal Access and Transport Area
LBCLaser Bias Current
LBCLLaser Bias Current Level
LBCNNormalized Laser Bias Current
LBOLine Build Out
LCLucent Connector; Line Card
LCAPLocal Craft Access Panel
LCASLink Capacity Adjustment Scheme
LCCLife-Cycle cost; Link Control Channel
LCDLiquid Crystal Display
LCLLower Confidence Limit
LCNLocal Computer Network; Logical Channel Number; Local Communications Network
LCRLeast Cost Routing
LCTLarge Capacity Terminal
LDLaser Diode
LDAPLightweight Directory Access Protocol
LDCCLine Data Communications Channel
LDPLabel Distribution Protocol
LDSLocal Digital Switch
LEAFLarge Effective Area Fiber
LECLocal Exchange Carrier
LECSLAN Emulation Configuration Server
LEDLight Emitting Diode
LEOLow Earth Orbit
LERLabel Edge Router
LESLAN Emulation Server
LFLine Fail
LFELine Far End
LGNLogical Group Node
LGXLight-Guide Crossconnects
LHLogical Host
LICLine Interface Card
LIFLine Interface
LIMLine Interface Module
LIPLocal Information Packet
LIULine Interface Unit
LLCLogical Link Control
LLSDCCLower-Layer Section DCC
LMLine Module
LMILocal Management Interface
LMPLink Management Protocol
LOLow Order
LOADMLightweight Optical Add/Drop Multiplexer
LOCLoss of Clock
LO-DXCLow Order Digital Cross Connect
LOFLoss of Frame
LOF-PPath Loss of Frame
LOHLine Overhead
LOMLoss of Multiframe; List of Materials
LOPLoss of Pointer
LOPDPLoss of Pointer Decay Period
LOPILoss of Pointer Inhibit
LOPIPLoss of Pointer Integration Period
LOP-PLoss of Pointer – Path
LOP-VVT Loss of Pointer
LOSLoss of Signal
LOSSLoss of Signal Seconds
LOVCLow-Order VC
LOWLocal Orderwire
LPLine Processor; Lockout of Protection; Low Order Path
LportLogical port
LP-SLockout of Protection – Span
LP-S/SF-PLockout of Protection – Span/Signal Fail – Protection
LRLong Reach (fiber); Line Regeneration Equipment
LRDCLong Reach Daughter Card
LSALow Speed ADM
LSA-E-EHLow Speed ADM Electrical (10/100 Base-T) Environmentally Hardened
LSA-O-EHLow Speed ADM Optical (100 Base-FX) Environmentally Hardened
LSBLeast Significant Bit
LSFLoss of Signal or Frame indication signal
LSLLower Specification Limit
LSMLoss of Sync Message
LSNLogical Subnetwork
LSPLabel Switched Path; Local Service Provider
LSRLabel Switch Router
LSSGRLATA Switching System Generic Requirements
LTLow Threshold; Laser Temperature
LTELine Terminating Equipment
LTNLocal Transport Network (fiber ring)
LTPLink Termination Point; Logical Termination Point
LTSLoop Testing System; Long Term Storage
LULine Unit
LVDLow-Voltage Distribution
LWPLow Water Peak
LZSLempel Ziv Stac
M12MUX DS-1 into DS2
M13MUX DS-1 into DS3
M23MUX DS-2 into DS3
MACMedia Access Control; Medium Access Control
MANMetropolitan Area Network
MAPMain Audio Program
MAUMedia Access Unit
Mb/sMegabits per second
MB/sMegabytes per second
Mbits/sMegabits per second
MbpsMegabits per second
MBpsMegabytes per second
MBSMaximum Burst Size
MCPManagement Control Processor
MCRMinimum Cell Rate; Minimum Cost Routing
MCTMaintenance Channel Transparency
MCTFMotion Compensated Temporal Filtering
MDMetroDirector K2 Platform
MDFMain Distribution Frame
MDUMultiple Dwelling Unit
mDVRMulti-TV Digital Video Recorder
MEAMismatch of Equipment and Attributes
MEGACOMedia Gateway Control Protocol
MERModulation Error Ratio
MFRMultilink Frame Relay
MGMedia Gateway
MGCMedia Gateway Controller
MGCPMedia Gateway Control Protocol
MGNManagement Gateway Node
MIBManagement Information Base
MIDMessage Identifier
MIPSMillions of Instructions per Second
MITManagement Information Tree
MiTTsMinutes of Telecommunications Traffic
MLMediation Layer
MLPPPMulti-Link Point-to-Point Protocol
MMMultimode; Multimedia
MMEMultiwave Management Element
MMFMulti-Mode Fiber
MMLMan Machine Language
MMOMain Material Order
MMPMultiwave Management Element
MOManaged Object
MODModule; Movies on Demand
MOFManaged Object Framework
MOPMethod of Procedure
MORMulti-wavelength Optical Repeater
MOSMean Opinion Score
MPManagement Portal
MP3MPEG-2 Layer 3
MPCKTSMulticast Packet Count
MPEGMoving Pictures Expert Group
MPIMulti-Path Interface; Multi-Path Interference
M-PlaneManagement Plane
MPLmSMulti-Protocol Lambda Switching
MPLSMulti Protocol Label Switching
MPLS-CPMPLS Control Plane
MPNMode Partition Noise
MPOAMulti Protocol over Asynchronous Transfer Mode
MPSModeling and Planning Suite
MPSModeling and Planning System; Modeling and Planning Suite
MPTMultiplex Pass-Through
MPTSMultiple Program Transport Stream
MRModification Request; Material Request; Medium Reach
MRRBMaintenance Requirements Review Board; Material Release Review Board
MSMultiplex Section
MSAMediation Services Administrator
MS-AISMultiplex Section – Alarm Indication Signal
MSBMost Significant Bit
MSCMetro Shelf Controller; Microsoft Cluster Server
MSFMultiservice Switching Forum
MSMMetro Switching Manager; Metro Switching Mismatch
MSNMMetro Switching Network Manager
MSNM MLMetro Switching Network Manager Mediation Layer
MSOMultiple System Operator
MSOHMultiplexer Section Overhead
MSPMultiplex Section Protection; Multiservice Switching Path
MS-PManual Switch – Protection
MSPPMultiservice Provisioning Platform
MSPVCManagement Soft Permanent Virtual Circuit
MS-RManual Switch – Ring
MS-RDIMultiplex Section – Remote Defect Indication
MS-REIMultiplex Section Remote Error Indication
MS-SManual Switch – Span
MS-Spring/MSPRMultiplex Section Shared Protection Ring
MSTMountain Standard Time; Multiplex Section Termination
MSTEMultiplex Section Terminating Equipment
MS-WManual Switch – Working
MTAMultimedia Terminal Adapter
MTBFMean Time between Failure
MTIEMaximum Time Interval Error
MTMMetro Transport Manager
MTTPTransparent Connection Termination Point
MTTRMean Time to Repair
MTTUMean Time to Understand
MTUMaximum Transmission Unit
MVOAMiniature Variable Optical Attenuator
NANo Alarm; Not Alarmed; Not Applicable; Not Available; Numerical Aperture
NADNetwork Access Domain
NAPNetwork Access Point
NAPTNetwork Address and Protocol Translation
NASNetwork Access Server; Network Attached Storage
NATNetwork Address Translation
NBINorthbound Interface
NBKNo Backup
NCNodal Controller; Normally Closed (contacts)
NCCNetwork Control Center
NCCINetwork Call Correlation Identification
NCPNodal Control Point; Nodal Control Processor
NCP&DNetwork Capacity Planning and Delivery
NCRNon-Conformance Report
NCSNetwork Computing System; Network Control System; Network Call Signaling
NCTANational Cable & Telecommunications Association
NDCNational Destination Code
NDFNew Data Flag
NDISNetwork Design and Inventory System
NDMHNon-Degraded Modem Hours
NDPNetwork Discovery Protocol; Neighbor Discovery Protocol
NDSFNon-Dispersion Shifted Fiber
NDVRNetwork Digital Video Recording
NENetwork Element
NE/FENear End/Far End
NEBSNetwork Equipment Building Standards; Network Equipment Building Systems
NECNational Electric Code
NEFNetwork Element Function
NEGNegative Terminal
NEIDNetwork Element Identification
NEIRNetwork Element Information Request
NEMANational Electrical Manufacturers Association
NFSNetworked File System
NGDLCNext Generation Digital Loop Carrier
NG-L1Next Generation Layer 1
NGNANext Generation Network Architecture
NINetwork Interface
NICNetwork Interface Card
NIDNetwork Interface Device
NIDUNetwork Interface Data Unit
NISNetwork Infrastructure Solutions
NIUNetwork Interface Unit
NLANetwork Layer Address; Network Layer Agent
NLCNode Line Card
NLDNeighbor Link Discovery
NLPINetwork Layer Protocol Identifier
NMNetwork Management; Network Manager; Network Management; Node Manager
NMANetwork Monitoring and Analysis
NMENetwork Management Ethernet
NMFNode-level Management Function
NMLNetwork Management Layer
NMSNetwork Management System
NNN key on keyboard for a no response
NNINetwork to Network Interface; Network Node Interface
NNIFNetwork to Network Interface
NNMNetwork Node Manager
NNTPNetwork News Transfer Protocol
NONetwork Object; Normally Open (contacts)
NOCNetwork Operations Center
NOCCNetwork Operations Control Center
NPCNetwork Parameter Control
NPRNoise Power Ratio
NRNo Reply
NRTNon-Real Time
NRTLNationally Recognized Test Laboratory
NRTVBRNon Real-Time Variable Bit Rate
NRZNon-Return to Zero
NSANon Service Affecting
NSAPNetwork Service Access Point
NSINetwork Side Interface
NSNNationally Significant Number
NSPNode Switch Provider; Node Switch Processor
NTWindow New Technology
NTFNo Trouble Found
NTFCNCDENotification Codes (TL1)
NTFSNew Technology File System
NTPNetwork Time Protocol
NTSNear Term Storage; Network Time Synchronization
NTSCNational Television Standards Committee
NUTNon-preemptive Unprotected Traffic
NVMNon-Volatile Memory
NVRAMNonvolatile Random Access Memory
NZDSFNon-Zero Dispersion Shifted Fiber
OAOptical Amplifier
OADMOptical Add/Drop Multiplexer
OAMOperations, Administration and Maintenance
OAMCellOperations, Administration and Maintenance Cell
OAMPOperation, Administration, Maintenance and Provisioning
O-BLSROptical-Bidirectional Line Switched Ring
OCOptical Carrier
OC-1Optical Carrier level 1, SONET bit rate = 51.84 Mb/s
OC-12Optical Carrier level 12, SONET bit rate = 622.08 Mb/s
OC-192Optical Carrier level 192, SONET bit rate = 9.953 Gb/s
OC-3Optical Carrier level 3, SONET bit rate = 155.52 Mb/s
OC-48Optical Carrier level 48, SONET bit rate = 2.488 Gb/s
OCAPOpenCable Application Platform
OCHOptical Channel
OCIOpen Connection Indication
OC-nOptical Carrier-number; Optical Carrier where N denotes a multiple of 51.84 Mb/s
OCTOctet Count
OCTUOptical Channel Transport Unit
OCXOOven-Controlled Crystal Oscillator
ODAOutlet Digital Adapter
ODACSOptical Data Acquisition and Control System
ODBMSObject Database Management System
ODFOptical Distribution Frame
ODPROptically Dedicated Protection Ring
ODUkOptical channel Data Unit where k is 1 or 2
OEPLOptical Ethernet Private Line
OEPLANOptical Ethernet Private Local Area Network
OEVPLOptical Ethernet Virtual Private Line
OEVPLANOptical Ethernet Virtual Private Local Area Network
OFCOpen Fiber Control; Optical Fiber Communication
OFDMOrthogonal Frequency Division Multiplexing
OFSOut of Frame Second
OIDObject Identifier
OIUOperator Interface Unit; Optical Interface Unit; Office Interface Unit
OLAOptical Line Amplifier; Optical Link Analysis
OLBOptical Link Budget
OLMOptical Link Module
OLMPOptical Link Management Protocol
OLSOptical Line System
OLTOptical Line Termination; Optical Line Terminal
OLTPOSRP Link Termination Point
OMOptical Module
OMCOperation and Maintenance Center
OMGObject Management Group
OMSON-Center Management Suite
ONOptical Network
ONEOptical Network Element
ONMON-Center Network Manager
ONTOptical Network Terminal
ONUOptical Network Unit
OOBOut of Band
OOFOut of Frame
OOKOn-Off Keying
OOM1Out of Multi Frame Stage 1
OOM2Out of Multi Frame Stage 2
OOOOptical – Optical – Optical
OOROut of Range
OOSOut of Service
OOS-MAOut of Service-Management
OOS-MAANROut of Service-Management and Abnormal
OpExOperations Expenditure
OPMOptical Performance Monitoring; Optical Power Meter
OPROptical Power Received
OPS/INEOperations Provisioning System/Intelligent Network Element
OPTOptical Power Transmit
OPTORLOptical Return Loss
OPTX AEOPTX Automation Engine
OPTX NMOPTX Network Manager
OpUkOptical channel payload Unit where k is 1 or 2
OPVCOptical channel Payload Virtual Container (timeslot)
ORBObject Request Broker
ORIGOriginal; Originating
ORLOptical Return Loss
ORPOptical Routing Protocol
OSOperating System
OSAOptical Spectrum Analyzer
OSCOptical Supervisory Channel; Optical Service Channel
OSDSOperations Systems Data Server
OSGIOpen Services Gateway Initiative
OSHAOccupational Safety and Health Act
OSIOpen Systems Interconnection
OSMOSC Splitter Module
OSMINEOperations Systems Modifications for the Integration of Network Elements
OSNROptical Signal-to-Noise Ratio; Open Signal-to-Noise Ratio
OSPOptical Signaling Protocol; Outside Plant
OSPFOpen Shortest Path First
OSPROptically Shared Protection Ring
OSRPOptical Signaling and Routing Protocols
OSSOperations Support System
OSSANOperations Support System Access Nodes
OSS-AUOut of Service-Autonomous
OSS-AUMAOut of Service-Autonomous and Management
OSS-AURSTOut of Service-Autonomous and Restricted
OSWFOn-site Work Force
OTCOperations Technical Center; Optical Transport Card
OTDROptical Time Domain Reflectometer
OTGROperations Technology Generic Requirements
OTNOptical Transport Network
OTSOptical Transport System
OTUOptical Transport Unit
OUIOrganizationally Unique Identifier
OUNIOptical User Network Interface
O-UPSROptical-Unidirectional Path Switched Ring
OUSMOptical Utility Services Manager
OUSPOptical Utility Services Platform
OWOrder Wire
OXCOptical Cross Connect
P2PPeer to Peer
PAPort Adapter; Pre-Amplifier
PADPower Attenuation Device
PANPersonal Area Networking
PATProgram Association Table
PAXPath Adaptation and X-Connect
PBORPrimary-Backup Object Replication
PBXPrivate Branch Exchange
PCPersonal Computer; Physical Contact; Processor Card
PCAProtection Channel Access
PCBPrinted Circuit Board
PCCProcessor Communication Channel
PCIPeripheral Component Interconnect
PCMPulse Code Modulation
PCMCIAPersonal Computer Memory Card Interface Adaptor
PCMMPacketCable Multimedia
PCNProgram Change Notice; Product Change Notice
PCOPre-Conditioned Order
P-CodeProduct Code
PCRPeak Cell Rate
PCSProvincial Civil Service & Personal Communication Service
PDAPersonal Digital Assistant
PDAPPower Distribution and Alarm Panel
PDCPassive Dispersion Compensator
PDFPortable Document Format
PDHPleisiochronous Digital Hierarchy
PDIPayload Defect Indication
PDLPolarization Dependent Loss
PDPPolicy Decision Point
PDUPower Distribution Unit; Protocol Data Unit
PEGPublic, Education, Government
PEMProcessor Enhancement Module; Processor Element Module
PEPPolicy Enforcement Point
PESQPerceptual Evaluation of Speech Quality
PFEPath Far End
PFMPacket Forwarding Module
PFOPremium Feature Open
PGPeer Group; Protection Group
PGIDPeer Group Identifier
PGLPeer Group Leader
PHYPhysical Layer Device; Physical
PICProgrammable Interrupt Controller
pidPassword Identifier
PIDPersonally Identifiable Data; Protocol Identifier; Packet Identifier; Personal Identification
PIFPacket Interface FPGA
PINPhoto Intrinsic; Positive-Intrinsic Negative; Personal Identification Number
PINGPacket Internet Groper
PIPPlug-In Provisioning
PJPointer Justification
PLPacket Loss
PLCPacket Loss Concealment
PLCNPilot Line Change Notification
PLCPPhysical Layer Convergence Protocol
PLDProgrammable Logic Device
PLLPhase Locked Loop
PLMPayload Label Mismatch
PLM-PPayload Label Mismatch – Path
PLM-VPayload Label Mismatch – VT
PLNPNNI Logical Node
PLOPath Layer Overhead
PMPerformance Management; Performance Monitoring; Program Manager; Project Manager
PMAPower Management Algorithm
PMBBPerformance Monitoring Building Block
PMDPolarization Mode Dispersion
PMDCPMD Compensator
PMMPower Management Module
PNPhysical Node
PNCPhysical Node Controller
PNNIPrivate Network-to-Network Interface; Private Network Node Interface
POPurchase Order
POCPoint Of Contact
POHPath Overhead
POMProject Office Manager
PONPassive Optical Network
POPPoint of Presence
PORPower on Reset
POSPacket over SONET; Positive Terminal
POSTPower on Self Test
POTSPlain Old Telephone Service
PPDPartial Packet Discard
PPJCPositive Pointer Justification Count
PPLPoint-to-Point Link
ppmPulse Position Modulation; Pulses per Million
PPMParts per Minute; Parts per Million; Pulses per Million
PportPhysical port
PPPPoint-to-Point Protocol
PPSPath Protection Switched; Pulses per Second
PPTPower Passing Tap
PRBSPseudo Random Bit Sequence
PRCPrimary Reference Clock
PRIPrimary Rate Interface
PRNGPseudo Random Number Generators
PROMProgrammable Read Only Memory
PROTProtocol; Protection
PRSPrimary Reference Source
PSPower Supply; Policy Server
PSAPacketCable Service Agreement
PSBFProtection Switching Byte Failure
PSCProtection Switching Count
PSDProtection Switching Duration
PSELPresentation Suite
PSIProgram Specific Information
PSLPath Signal Label
PSMPersistent Stored Module
PSNPacket Switch Node; Packet Switched Network
P-SNCPermanent SNC
PSQMPerceptual Speech Quality Measurement
PSRProtection Side Regeneration; Path Switched Ring
PSTPrimary State; Pacific Standard Time
PSTNPublic Switched Telephone Network
PSUPower Supply Unit; Packet Switch Unit
PTPass-Through; Payload Type
PTEPath Terminating Equipment
PTIPayload Type Indicator
PTPPhysical Termination Point; Point-To-Point; Path Termination Point
PTSEPNNI Topology State Element
PTSPPNNI Topology State Packet
PVProtocol Violation
PVCPermanent Virtual Circuit; Poly Vinyl Chloride; Private Virtual Circuit
PVRPersonal Video Recorder
PWBPrinted Wire Board
PWMPulse Width Modulation
Q3Telecommunications Management Network (TMN) Interface
QAMQuadrature Amplitude Modulation
QLQuality Level
QMCQUICC Multichannel Controller
QoSQuality of Service
QPSKQuadrature Phase Shift Keying
QUICCQuad Integrated Communications Controller
R&DResearch and Development
R.H.Relative Humidity
RADIUSRemote Authentication Dial-In User Service
RAIRemote Alarm Indication
RAIDRedundant Array of Inexpensive Disk; Redundant Array of Independent Disk
RAIGResource Availability Information Group
RAMRandom Access Memory
RANRegional Area Network
RBFReconfigurable Blocking Filter
RBMRegional Business Manager
RBOCRegional Bell Operating Company
RBWResolution Bandwidth
RCCRouting Control Channel
RDFRate Decrease Factor
RDIRemote Defect Indication
RDI-LRemote Defect Indication – Line
RDI-PRemote Defect Indication – Path
REDRandom Early Detection; Random Early Discard
REIRemote Error Indication
REI-LRemote Error Indication – Line
REI-PRemote Error Indication – Path
RFRadio Frequency
RFCRequest for Comment
RFIRadio Frequency Interference; Remote Failure Indication; Request for Information
RFI-LRemote Failure Indication (detected at the line-layer)
RFI-PRemote Failure Indication (detected at the path-layer)
RFTRadio Frequency Transmitter
RGResidential Gateway
RHCRegional Holding Company
RIBRouting Information Base
RINRelative Intensity Noise
RIPRouting Information Protocol
RJRegistered Jack
RKSRecord Keeping Server
RMAReturn Material Authorization; Replace Material Authorization
RMANRecovery Manager
RMIRemote Method Invocation
RMSRoot Mean Square
RNRNot Ready to Receive; Remote Failure Indication
ROADMRe-configurable Optical Add/Drop Multiplexer
ROCRegional Operations Center
ROIReturn on Investment
ROMRead Only Memory
ROWReturn Order Wire
RPMRevolutions per Minute
RPRResilient Packet Ring
RRReady to Receive; Reverse Request
RRBReliability Review Board
RRORecord Route Object
RR-RReverse Request – Ring
RR-SReverse Request – Span
RSRegenerator Section; Reed-Solomon
RS-ERing Switch – East
RSOHRegenerator Section Overhead
RSPRoute Switch Processor
RSTRegenerator Section Terminating
RSVPResource Reservation Protocol
RSVP-TEResource Reservation Protocol with Traffic Engineering
RS-WRing Switch – West
RTRemote Terminal; Real Time
RTCReal-Time Clock
RTIReal-Time Ingest
RTNReturn (voltage return)
RTOSReal-Time Operating System
RTPRouting Table Protocol; Real-Time Transport Protocol; Routine Task Procedure
RTSReady to Send; Request to Send; Real Time Operation System
RTSPReal Time Streaming Protocol
RTTRound-trip Time
RTURight to Use
RTVBRReal-Time Variable Bit Rate Traffic
RURack Unit
RWARouting and Wavelength Assignment
Rx LineReceive Line
RZReturn to Zero
RZ-DPSKReturn to Zero Differential Phase Shift Keying
s.f.Square Foot
S/IMPSignal to Impulse Ratio
S/NSignal to Noise Ratio
SAALSignaling ATM Adaptation Layer
SABLIMEProduct Administration System (AT&T)
SADM04-eSONET/SDH Add/Drop Multiplexer (ONLINE Edge Platform)
SANStorage Area Network
SAPSecondary Audio Program
SARSegmentation and Reassembly
SARPSwitching Address Resolution Protocol
SASSeverely Errored Frame and AIS Seconds
SASEStandalone Synchronization
SATASerial AT Attachment
SATCOMSatellite Communications
SATTSynchronization, Alarms, and Telemetry Termination
SAWSurface Acoustic Wave
SBLKErrored Superblocks
SBSStimulated Brillouin Scattering
SBVSwitched Broadcast Video
SBWSignal Bandwidth
SCService Channel; Square Connector; Shelf Controller
SCCSerial Communications Controller; Serial Communications Channels
SCCISmall Computer System Interface
S-CDMASynchronous Code Division Multiple Access
SCMService Channel Modem; Sub-carrier Multiplexing
SCNService Channel Network; Shared Content Network
SCRSustainable Cell Rate; Silicon Controlled Rectifier
SCSISmall Computer System Interface
SCTESociety of Cable Telecommunications Engineers
SDSignal Degrade; Signal Detect; Standard Definition
SDCCSection Data Communications Channel
SDHindustries_cable Synchronous Digital Hierarchy
SDISecure Digital Interface; Serial Digital Interface
SDLSynchronous Data Link; Synchronous Delay Line
SDLCSynchronous Data Link Control
SDMHSeverely Degraded Modem Hours
SDPSession Description Protocol
SD-PSignal Degrade – Path
SD-RSignal Degrade – Ring
SDRAMSynchronized Dynamic Random Access Memory
SD-SSignal Degrade-Span
SDTVStandard Definition Television
SDUService Data Unit
SESystems Engineer
SEALSimple and Efficient Adaptation Layer
SEFSeverely Errored Framing
SEFSSeverely Errored Frame Seconds
SEFS-SSeverely Errored Framing Seconds – Section
SEMService Entitlement Manager
SEMSSeverely Errored Multi-frame Seconds
SESSeverely Errored Seconds
SES-LSeverely Errored Seconds – Line
SES-LFESeverely Errored Seconds – Line Far End
SES-PSeverely Errored Seconds – Path
SES-PFESeverely Errored Seconds – Path Far End
SESRSeverely Errored Second Ratio
SES-RSSeverely Errored Seconds – Regenerator Section
SES-SSeverely Errored Seconds – Section
SES-VSeverely Errored Seconds – VT
SES-VFESeverely Errored Seconds – VT Far End
SETSSynchronous Equipment Timing Source
SFSignal Failure; Super Frame
SFDStart of Frame Delimiter
SFDADM02-eSONET/SDH Framed Data Add/Drop Multiplexer (ONLINE Edge Platform)
SFFSmall Form Factor (connector)
SFOSync Frequency Offset
SFPSmall Form-factor Pluggable
SF-RSignal Failure – Ring
SF-SSignal Failure – Span
SGSignaling Gateway
SGCSignaling Gateway Controller
shBourne Shell
SHxShelf Number
SISerial Interface; Service Independent
SICSystem Integrity Control; Standard Industrial Classification
SIDSystem Identification number; Source Identifier
SIFSONET Interoperability Forum; Switch Interface FPGA
SIMService Interface Module
SIPSession Initiation Protocol
SLAService Level Agreement
SLIPSerial Line Internet Protocol
SLMService Layer Manager
SLOSSSynchronization Loss
SLRService Level Report
SMSingle Mode; Switching Module; Shelf Manager
SMBSmall and Medium Business
SMCSerial Management Controllers; Standard Management Committee
SMDSSwitched Multimegabit Data Service
SMESmall and Medium Enterprise
SMFSingle Mode Fiber
SMIRSingle Mode Intermediate Reach
SMLService Management Layer
SMLRSingle Mode Long Reach
SMMService Mediation Module
SMONSwitch Monitor
SMOPService Method of Procedure
SMSService Management Suite
SMTSurface Mount Technology; Self-Monitoring Task
S-MTAStandalone Multimedia Terminal Adaptor
SNASystems Network Architecture
SNCSubnetwork Connection; Subnetwork Controller
SNCPSubnetwork Connection Protection
SNCP/ISubnetwork Connection Protection/Inherent monitoring
SNCP/NSubnetwork Connection Protection/Non-intrusive monitoring
SNMSwitching Network Manager
SNMPSimple Network Management Protocol
SNPSequence Number Protection
SNRSignal-to-Noise Ratio
SNTPSimple Network Time Protocol
SOASemiconductor Optical Amplifier
SOADMSelect Optical Add/Drop Multiplexer
SOFStart of Frame
SOHSection Overhead; State of Health
SOHOSmall Office/Home Office
SONETindustries_cable Synchronous Optical Network
SOPStandard Operating Procedure
SPShelf Processor; Shelf Pump
SPCSONET Permanent Circuit
SPESynchronous Payload Envelope
SPFShortest Path First
SPISerial Peripheral Interface; Service Provider Interface
SPMSelf-Phase Modulation
SPR/SPRingShared Protection Ring
SPTPService Path Termination Point
SPVCSoft Permanent Virtual Connection; Soft Permanent Virtual Circuit
SQLStructured Query Language
SRShort Reach (fiber)
SRAMStatic Random Access Memory
SRDSoftware Release Document
SRNSoftware Release Notice
SRSStimulated Raman Scattering
SRTSSynchronous Residual Time Stamp
SRVEFFService Affecting (TL1)
SSBSingle Sideband
SSCOPService Specific Connection Oriented Protocol
SSCSService-Specific Convergence Sublayer
SSELSession Selector
SSFServer Signal Failure
SSLSecure Sockets Layer
SSMSynchronization-Status Messages
SSMFStandard Single Mode Fiber
SSTSecondary Service State
SSTURSite-Specific Turn-Up Report
SSUSynchronization Supply Unit
STStraight Terminus; Straight Tip
ST1Stratum 1
ST2Stratum 2
ST3Stratum 3
ST3EStratum 3 Enhanced
ST4Stratum 4 (Asynchronous)
STBSet-Top Box
STCStacking and Timing Card
STESection Terminating Equipment; Section Terminating Element
STII (2)Type of optical connector
STMSynchronous Transfer Mode
STM-0Synchronous Transfer Mode level 0, SDH bit rate = 51.84 Mb/s
STM-1Synchronous Transfer Mode level 1, SDH bit rate = 155.52 Mb/s
STM-16Synchronous Transfer Mode level 16, SDH bit rate = 2488.32 Mb/s
STM-4Synchronous Transfer Mode level 4, SDH bit rate = 622.08 Mb/s
STM-64Synchronous Transfer Mode level 64, SDH bit rate = 9953.28 Mb/s
STM-nSynchronous Transport Module “n”
STM-nCSynchronous Transport Module of level n concatenated
STMXSONET/SDH Thin Multiplexer
STPSpanning Tree Protocol; Shielded Twisted Pair
STSSynchronous Transport Signal
STS-1Synchronous Transport Signal Level 1
STS-3Synchronous Transport Signal Level 3
STS-3cSynchronous Transport Signal Level 3, concatenated
STS-nSynchronous Transport Signal “n”
STS-NcContiguous Concatenation of N STS-1 SPEs
STS-N-XvVirtual Concatenation of X STS-N SPEs
STUSecure Telephone Unit; Synchronized, Traceability Unknown; Stratum Traceability Unknown
STU-PStratum Traceability Unknown-Provisioned
SVCSwitched Virtual Circuit
SVCCSwitched Virtual Channel Connection
SVODSubscription Video on Demand
SVPSecure Video Processor
SVPCSwitched Virtual Path Connection
SWCASplit Working Channel Access
SWIDSoftware Identifier
SXShort Reach as in 1000Base-SX
SYNCIOSynchronized Input/Output
SYSLOGSystem Log
T1Service or line operation at the DS-1 rate
T3Digital Carrier System for DS3 Signals
TACTransport Aggregated Circuit; Technical Assistance Center
TACSTotal Access Communications Systems
TADRTarget Address
TADRMAPTarget Address Map
TAPTest Access Port; Technician Access Port
TARPTarget Identifier Address Resolution Protocol
TBOSTelemetry Byte Oriented Serial Protocol
TBUTransport Bandwidth Unit
TBUSTiming Bus
TCTransmission Convergence; Transport Complex; Transport Channel
TCAThreshold Crossing Alert; Timing Control and Access
TCBETotal Corrected Bit Error
TCMTrellis Coded Modulation; Transport Channel Members
TCMOTransport Complex Managed Object
TCPTransmission Control Protocol; Trouble Cleaning Procedure
TCP/IPTransmission Control Protocol/Internet Protocol
TCTPTransparent Connection Termination Point
TDTraffic Director
TDEVTime Deviation
TDMTime Division Multiplexing
TETerminal Equipment
TEALCoreDirector® Events, Alarms, and Logging
TECThermo-Electric Cooler
TEDTraffic Engineering Database
TEITerminal Endpoint Identifier; Terminal Equipment Identifier
TelcoTelephone Company
TELRTalker Echo Loudness Rating
TEOTelephone Equipment Order
TFTThin Film Transistor
TFTPTrivial File Transfer Protocol
TGTiming Generator
TGCPTrunking Gateway Control Protocol
TGSTime Generation System
THECCorrected Type Header Error Correction Code
THzTeraHertz (1012 hertz)
TIATelecommunications Industry Association
TIDTarget Identification; Terminal Identification
TIETime Interval Error
TIMTrace Identifier Mismatch; Transmit Intermediate Multiplexer
TIM-STrace Identifier Mismatch – Section
TIRKSTrunk Integrated Record Keeping System
TISSATime Space Switch Application-Specific Integrated Circuit
TKIPTemporal Key Integrity Protocol
TL-1Transaction Language 1
TL-1 CLITransaction Language One, Command Line Interface
TLCTransport Logical Connection
TLITransaction Language Command Line Interface
TLSTransparent LAN Services
TLSRTransoceanic Line Switched Ring
TMTiming Module; Transaction Manager
TMLTelephony Markup Language
TMNTelecommunications Management Network
TMOTrans Metro Optical (platform)
tmoutTime Out
tmperTime Period
TMUXTerminal Multiplexer
TNLEthernet Tunneling
TNMTransport Network Management
TODTelevision on Demand
ToDTime of Day
TOHTransport Overhead
TOPTask Oriented Practice; Task Oriented Procedure
TOSType of Service
TPTermination Point
TPFITiming Plane Fault Isolation
TRTechnical Reference
tRTOTCP Retransmit Timeout
TrTOHTransparent Transport Overhead
TSTime Slot; Time Stamp; Time Synchronization
TSATime Slot Assignment
TSDTransport System Division
TSETopology State Element
TSELTransport Selector
TSFTransport Signal Failure
TSGTiming Signal Generator
TSITime Slot Interchange; Time Switch Interchange
TSRTechnical Service Representative
TSXTime-Space Switch ASIC
TTETransparent Terminal Equipment
TTLTransistor Transistor Logic; Time to Live
TTPTrail Termination Point
TTTPTransparent Trail Termination Point
TUTributary Unit; Transmission Unit
TUGTributary Unit Group
TUG-nTributary Unit Group, level n
TU-nTributary Unit, level n
TWCTrueWave Classic
Tx LineTransmit Line
UARTUniversal Asynchronous Receiver/Transmitter
UASUnavailable Seconds
UASLUnavailable Second Count-Line
UAS-LUnavailable Seconds – Line
UAS-LFEUnavailable Seconds – Line Far End
UASPUnavailable Second Count-Path
UAS-PUnavailable Seconds – Path
UAS-PFEUnavailable Seconds – Path Far End
UAS-RSUnavailable Seconds – Regenerator Section
UAS-SUnavailable Seconds – Section
UAS-VUnavailable Seconds – VT
UAS-VFEUnavailable Seconds – VT Far End
UATUnavailable Time
UBUncorrected Block
UBRUndefined Bit Rate; Unspecified Bit Rate
UBRVBRUnspecified Bit Rate Variable Bit Rate
UCUser Channel
UCAUnswitched Channel Access
UCBEUncorrectable Block Error
UCDUpstream Channel Descriptor
UDUnconditional Disconnect
UDLRUnidirectional Link Routing
UDPUser Datagram Protocol
UDRUnconditional Disconnect Response
UFECUltra Forward Error Correction
UGCUniversal Gateway Carrier
UGSUnsolicited Grant Service
UHDUltra High Density
UHFUltra High Frequency
UIUser Interface
UIDUser Identifier
UITSUnacknowledged Information Transfer Service
ULUnderwriters Laboratories
ULHUltra Long Haul
ULSDCCUpper Layer Section Data Communications Channel
UMTSUniversal Mobile Telecommunications System
UNEQUnequipped Path; Unequipped
UNEQ-PUnequipped Path
UNEQ-VUnequipped VT
UNEsUnbundled Network Elements
UNI/UNIFUser Network Interface
UNIIUnlicensed National Information Infrastructure
UOGUniversal OSS Gateway
UPCUltra Physical Contact; Universal Packet Carrier; Usage Parameter Control
UPnPUniversal Plug and Play
UPSUninterrupted Power Supply
UPSRUnidirectional Path Switched Ring
URIUniversal Resource Identifier
URLUniversal Resource Locator
USAUniversal Shelf Amplifier
USBUniversal Serial Bus
USEPAUnited States Environmental Protection Agency
UTCUniversal Time Coordinated; Universal Transport Carrier
UTOPIAUniversal Test and Operations Physical Interface for ATM
UTPUnprotected Termination Point; Unshielded Twisted Pair
UVCUniversal Voice Carrier; Universal Video Carrier
VACVolts Alternating Current
VADVoice Activity Detection
VAPVirtual Access Partitioning
VBIVertical Blanking Interval
VBRVariable Bit Rate
VCVirtual Circuit; Virtual Channel; Virtual Container; Virtual Concatenation
VCATVirtual Concatenation
VCCVirtual Channel Connection
VCGVirtual Concatenation Group
VCIVirtual Channel Identifier
VCLVirtual Channel Link
VCMVirtual Concatenation-group Member
VC-NVirtual Container Level N (N=11, 12, 2, 3, 4)
VC-N-XcContiguous Concatenation of X Virtual Containers at Level N
VC-N-XvVirtual Concatenation of X Virtual containers at Level N
VCOVoltage Controlled Oscillator
VCRVideo Cassette Recorder
VCSELVertical Cavity Surface-Emitting Laser
VCXOVoltage Controlled Crystal Oscillator
VDCVolts Direct Current
VDSLVery-high-bit-rate Digital Subscriber Line
VFVirtual Fiber; Virtual Facility
VFTPVirtual Facility Termination Point
VGVirtual Group
VGAVariable Gain Amplifier
VHFVery High Frequency
VLANVirtual Local Area Network
VLRVery Long Reach
VLSRVirtual Line Switched Ring
VMVoice Mail; Virtual Memory
VOAVariable Optical Attenuator
VODVideo on Demand
VoIPVoice over Internet Protocol
VOMVolt-Ohm Meter
VOQVirtual Output Queuing
VOWVoice Order Wire
VPVirtual Path
VPCVirtual Path Connection
VPCIVirtual Path Connection Identifier
VPGVirtual Path Group
VPIVirtual Path Identifier
VPI/VCICombined, VPI and VCI identify a connection on an ATM Network
VPLVirtual Path Link
VPLSVirtual Private LAN Service
VPNVirtual Private Network
VPSVoice Processing System
VPSPVirtual Path Switch Protection
VRRPVirtual Router Redundancy Protocol
VSAVirtual-Scheduling Algorithm; Vector Signal Analyzer
VSATVery Small Aperture Terminal
VSIVendor-Specific Information
VSRVery Short Reach
VTVirtual Tributary
VT-100Terminal Emulation System
VTGVirtual Tributary Group
V-UNIVirtual User Network Interface
WWatt; Working
WADWavelength Add and Drop
WANWide Area Network
WBWorking Band; Westbound
WCAWorking Channel Access
WCIWavelength Converter Interface
WCI RTWavelength Converter Interface Rate Tunable
WCIRT-eWavelength Converter Interface Rate Tunable (ONLINE Edge Platform)
WCSSWDM Capable Switching System
W-DCSWideband Digital Cross-Connect System
WDMWavelength Division Multiplexing
WDTWatchdog timer
WECAWireless Ethernet Compatibility Alliance
WEPWired Equivalency Privacy
WFAWorkforce Automation
WFMWorkforce Management
WFQWeighted Fair Queuing
WIFWide Area Network Interface
WiFiWireless Fidelity
WiMediaAn alliance for Wireless Multimedia
WLANWireless Local Area Network
WM9Windows Media Player Version 9
WPAWireless (WiFi) Protected Access
WPSWorking/Protect Splitter
WREDWeighted Random Early Discard; Weighted Random Early Detection
WSSWavelength Selective Switch
WTRWait to Restore
WWNWorld Wide Name
X.25Packet Switched Communications Interface
XCCross Connect
XDSLSee DSL (Digital Subscriber Line)
XFP10 Gb/s small form-factor pluggable transceiver
XMLExtensible Markup Language
XPMCross-Phase Modulation
ZACZero Administration Client
ZWPZero Water Peak

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