OSS Acronyms / Glossary

AcronymFull DescriptionExtra Details
A linksaccess linksSS7 Notation
AAAAuthentication Authorization and   Accounting
AALATM Adaption Layer
ABRAvailable Bit Rate. Describes a   quality of service on ATM networks
ACDAutomatic Call Distribution
ACEATM Circuit Emulation
ACELPAlgebraic CELPVoice Compression Technology
ACMaddress complete messageSS7 Notation
ACRAttenutation to Crosstalk RatioCopper cabling measurement   standard
ACSAccess Control and Security
active   equipmentThe electronic equipment that   generates, transmits and receives signals to & from a telecommunications   network.
ADMAdd-drop MultiplexerSDH Equipment Type
ADPCMAdaptive Differential Pulse Code   ModulationVoice Compression Technology
ADSLAsymmetric Digital Subscriber   LineInformation Transfer protocol.   One style of transmitting information over a network
AGSAdvanced Gaming Service
AISAlarm Indication Signal
ANManswer messageSS7 Notation
APSAutomatic Protection Switching
ARDISAdvanced Radio Data   Information Service
ARPUAverage Revenue per user
ASICApplication Specific Integrated   Circuit
ASN.1Abstract syntax notation one
ATCAdaptive Transform CodingVoice Compression Technology
ATISAlliance for   Telecommunications Industry Solutions
ATMAsynchronous Transfer ModeTransmission protocol that   segments user traffic into small fixed sized cells.  Cells are transmitted to their destination   across various routes, and the original traffic is re-assembled.
AUAdministrative unit
AUCAuthentication Centre
AUGAU group
B linksbridge linksSS7 Notation
BandwidthThe amount of data transmitted,   usually referred to in units of bps)
BASBuilding Automation System
BDLABidirectional Line Amplifier
BDSLBroadband Digital Subscriber   Line
BERBit Error Rate
BIBbackward indicator bitSS7 Notation
bitsDiscrete pieces of digital   information
BLSRBidirectional Line Switched Ring
bpsbits per second. The rate at   which digital information is sent
BRBidirectional Ring
BRABasic Rate AccessISDN Type
broadband servicesA telephone signal is considered   a “narrowband” service, because only one signal transmits at a   time. But if multiple signals are transmitted simultaneously as different   “channels”, it is considered “broadband”
BSCBase Station Controller
BSNbackward sequence numberSS7 Notation
BTSBase Transceiver Station
CACCarrier Access Code
CANCustomer Access Network
carriersAlso known as telecommunications   carriers or telcos. Well known examples are Telstra and Optus
CATCommittee on Applications   and Technology
CAT-5Category 5 unshielded twisted   pair is an industry standard for unshielded   twisted copper wire capable of supporting high speed data traffic (up to 100   MHz for 100 ohm and 120 ohm balanced cables i.e. 100 Mbps LANs and ATM @ 155   Mbps) over short distances.
CATVCommon Antenna TeleVision (also   known as Cable TV)
CBCitizen Band
CBCall Barring
CBRConstant Bit RateEg. Describes a quality of   service on ATM networks
CBTComputer Based Training
CCCall Conferencing
CC7Common Channel Signalling # 7TDM Domain
CCITTConsultative Committee on   International Telegraphy and Telephony
CCRCall Charging Record.
CCS7Common Channel Signalling # 7TDM Domain
CCTVClosed Circuit Television
CDChromatic Dispersion
CDCompact Disk.
CDCall Diversion
CDECommon Desktop Environment.
CDMACode Division Multiple Access
CDPDCellular Digital Packet Data
CELPCode Excited Linear PredictiveVoice Compression Technology
CFCall Forwarding
CH/CWCall Hold / Call Waiting
CHAPCryptographic Handshake   Authentication Protocol
CIConfiguration itemITIL terminology
CICCommittee on Information   and Communications
CIFCell in FramesATM over Ethernet & Token   Ring LANs
CLICalling Line IdentificationShows incoming caller number or   ID
CLIPCalling Line Identification   PresentationShows incoming caller number or   ID
CLIRCalling Line Identification   Restriction
CLNPConnection Less Network Protocol
CMConfiguration Management
CMSCall Management Services
CMTSCellular Mobile Telephone   Service
CNMCustomer Network Management
COCCouncil on Competitiveness
COMPLECCompetitive Local Exchange   Carrier
conductorA metallic wire designed to   carry signals (eg copper telephone lines).
CONSConnection-Mode Network service.
CORBACommon Object Request   Broker ArchitectureSystem interface technique
CPConnection point
CPECustomer Premises Equipmenteg modems, routers, etc at   customer premises
CPLDComplex Programmable Logic   Device
CPUCentral Processing Unit
CRMCustomer Resource Management
CRTClass Room Training
CSCaesium ClockSynch Domain
CS-ACELPConjugate structure Algebraic   CELPVoice Compression Technology
CSMA/CDCarrier Sense Multiple Access   with Collision Detection
CSNControl System Network
CSPPComputer Systems Policy Project
CSTAComputer Supported   Telecommunications ApplicationsFrom ECMA. Defines application   level CTI functions
CSTBComputer Science and   Telecommunications Board
CTCall Tracing
CTIACellular   Telecommunications Industry Association
CTPConnection termination point
D linksdiagonal linksSS7 Notation
DASDual Attachment StationFDDI Notation
DBSDirect Broadcast Satellite
DCFDispersion Compensating Fibre
DCGDispersion Compensating Grating
DCMEDigital Circuit Multiplication   EquipmentVoice Compression Technology
DCNData Control NetworkA network used to carry network management traffic
DCSDigital Cross-connect System   (qv. DXC)
DCSData Communication Server in   XMATE.
DDFDigital Distribution FrameFor interconnection of cables at   head-end.
DDSDigital Data Service
DECTDigital Enhanced Cordless   Telecommunications
DESData Encryption Software
DETDigital Entertainment Terminal
DHCPDynamic Host Configuration   Protocol
DIUDigital Interface UnitTDM Domain
DLCIData Link Connection IdentifierISDN “Circuit”   identifier
DMADirect Memory Access
DNSDomain Name Server
DOCSISData Over Cable   Service Interface Specification
DODDepartment   of Defense
DOEDepartment   of Energy
DOSDisk Operating System
DoTDepartment Of Telecommunication
downstreamTransmission of information from   the service provider to the customer
DPCdestination point codeSS7 Notation
DPNSSDigital Private Network   Signaling System
DRPDisaster Recovery Plan
DSDigital section
DS1A bandwidth unit (1.5 Mbps),   described when used for certain transfer protocols
DS3A bandwidth unit (45 Mbps),   described when used for certain transfer protocols
DSFDispersion Shifted Fibre
DSLDigital Subscriber Lines
DSLAMDigital Subscriber Line Access   MultiplexerADSL Domain
DSSDecision Support System
DVBDigital Video Broadcasting.   Transmission of digital video signals
DWDMDense Wavelength Division   MultiplexingDWDM Domain
DXCDigital Cross Connect
E linkextended linkSS7 Notation
E1A bandwidth unit (2.048 Mbps),   described when used for certain transfer protocols
E3A bandwidth unit (34 Mbps),   described when used for certain transfer protocols
EAEqual AccessTFN Service Type
easementPiece of land in which cables,   conduits, etc can be placed.
ECEmergency Correction.
EDFAErbium Dope Fibre Amplifier
EDIElectronic Data Interchange
EIAElectronic Industries   Association
EMDFEnhanced Main Distribution FrameA LAN distribution frame where   cables and LAN ports are patched.
EMSElement Management System
EPPEmergency Power Plant
ETEnd TerminalDWDM Domain
EthernetA local area network (LAN) protocol. One style of transmitting information over a local area network.
F linkfully associated linkSS7 Notation
FADFull Add DropDWDM Domain
FCAPSFaults, Configuration,   Accounting, Performance, Security management
FCCFederal Communications   Commission
FDDIFibre Distributed Data Interface
FDPfibre distribution points. Point   of interconnect of cables. Allows distribution of signal from head-end to a   customer or customers.
FEFast Ethernet
FECForward Error Correction
FEPFront End Processor
FERFFar end receive failure
FIBforward indicator bitSS7 Notation
FISUfill in signal unitSS7 Notation
FMFacilities Management.   Management and coordination of telecommunications equipment.
FMCGFast Moving Consumer Goods
FMOFuture Mode of Operation   (Telstra)
FMSFile Management Subsystem in   AXE.
FMSFibre Monitoring System
FOOptical fibre
FOAFixed Optical Attenuator
FPGAField Programmable Gate Array
FPUFile Process Utility in AXE.
FRFrame RelayTFN Service Type
Frame RelayInformation Transfer protocol.   One style of transmitting information over a network
FSANFull Services Access Network. A   network capable of carrying all forms of information with varying bandwidths   and urgency of transmission.
FSNforward sequence numberSS7 Notation
FSPFixed Line Service Provider
FTAMFile Transfer, Access and   Management (ISO 8571).
FTPFile Transfer Protocol
FTTCFibre To The Curb. A style of   cable network, where optical fibre carries signals from the head-end to the   curb. From the curb to the home, the signal is carried by other cable types   (eg normal copper telephone cables or coaxial cables).
FTTHFibre To The Home. A style of   cable network, where optical fibre carries signals from the head-end all the   way to the home.
FWMFour Wave Mixing
GbpsGigabits per second   (1,000,000,000 bps)
GDMOGuidelines for the definition of   managed objects
GDPGross Domestic Product
Gigabit EthernetSimilar to 10BaseT Ethernet,   except with a theoretical bandwidth of 1Gbps instead of 10Mbps.
GIIGlobal Information   Infrastructure
GILSGovernment Information   Locator Service
GPRSGeneral Packet Radio Service
GPSGlobal Positioning SystemSynch Domain
GSMGlobal System for Mobile   Communications
GSSIGovernment Services   Information Infrastructure
GSTGoods and Services Tax
GUIGraphical User Interface
HCThome communications terminal
HDSLHigh-Bit-Rate Digital   Subscriber Line
HDTVHigh-Definition TelevisionThe next generation of   television. Provides greater picture resolution than current television   signals.
HFCHybrid Fibre / Coaxial A style of cable network. Makes use of both   optical fibre and coaxial cables to guide information from one point to   another.
HLRHome Location Register
HPAHigher order path adaptation
HPCHigher order path connection
HPCCIHigh   Performance Computing and Communications Initiative
HPTHigher order path termination
HTHub TerminalLMDS Domain
HTMLHypertext Markup Language
HUHub UnitLMDS Domain
IAIndirect adaptor
IAMinitial address messageSS7 Notation
IBSIntegrated Business System
ICIntegrated Circuit
IDCInternet Data Centre
IDUIn-door UnitLMDS Domain
IEEEInstitute for   Electrical and Electronics Engineers
IETFInternet Engineering Task Force
IFLInterfacility LinkLMDS Domain
IHSInformation Handling Server in   XMATE.
IISPInformation   Infrastructure Standards Panel
IITFInformation Infrastructure   Task Force
ILDInternational Long Distance
IMAInteractive Multimedia   Association
IMBEImproved MBEVoice Compression Technology
INIntelligent NetworkTDM Domain
integration of voice, video   and dataPreviously the different types   of signals were sent on different networks. However, integration was set up   to use a single network infrastructure to carry all types of signals.
IOInput / OutputAMAS Domain
IPInternet Protocol (RFC-791).
IPCInter Process Communication.
ISInformation   Systems
ISDInternational Subscriber Dialing
ISDNIntegrated Services Digital   NetworkInternational standard that   defines a digital end-to-end network that can support voice, data, image and   video simultaneously
ISLInternetworking Swich Link
ISPInside Plant
ISPInternet Service ProviderAllows customers access to the   Internet and Internet facilities.
ISUPISDN user partSS7 Notation
ITInformation Technology
ITILInformation Technology   Infrastructure Library
ITSIntelligent Transportation   System
ITUInternational   Telecommunications Union
ITU-TSSInternational Telecommunications   Union – Telecommunications Standards Sector is the new name for CCITT which is an   international standards body which is a committee of the ITU, a U.N. treaty   organisation.
IVRInteractive Voice Response
IXCInterexchange   Carrier
JDBCA SUN JAVA standard for   connecting client applications to external databases
JTAPIJava Telephony APIFrom Sun Microsystems, Lucent,   et al. Provides CTI in either 1st or 3rd party environment
kbpsKilobits per second (1,000 bps)
KioskAn information outlet, similar   to Automatic Teller Machines
LANLocal Area Network is a network which encompasses   inter-connectivity between physically nearby devices such as on the same   floor / between floors of a building or around a campus.  They no not generally require public access   and support high speed data over short distances
LANLocal Area NetworkSmall networks of computers,   usually in office or campus environments.
LAN interconnect servicesAllows communications between   different information transfer protocols
LAPBLink Access Procedure, BalancedData link layer protocol in the   X.25 protocol stack. LAPB is a bit-oriented protocol derived from HDLC
LATALocal Access And Transport Area
LCLogical Channel
LDAPLightweight Directory Access   Protocol
LDCALong Distance Charge Area
LD-CELPLow delay CELPVoice Compression Technology
LDSLeased Data ServiceTFN Service Type
LECLocal   Exchange Carrier
LEOLow   Earth OrbitSatellite
LES/BUSLAN Emulation Software &   Broadcast Unknown Server
LLLogical Link
LLCLogical Link Control standards.
LMBLarge Megabit BearerTelstra service
LMDSLocal Multipoint Distribution   ServiceLMDS Domain
LOFLoss of frame
LOPLoss of pointer
LOSLoss of signal
LPALower order path adaptation
LPCLower order path connection
LPTLower order path termination
LSSUlink status signal unitSS7 Notation
LTELine Terminal Equipment
LTGLine Trunk GroupTDM Domain
LTULine Trunk UnitTDM Domain
LVPLogical Virtual PathADSL Domain
M2MMachine to Machine
MACMedia Access Control
MANMetropolitan Area Network
MANOManagement and OrchestrationNFV functional component
MBEMultiband ExcitationVoice Compression Technology
MbpsMegabits per second
MCNMedia Conversion Node
MCUMetered Call Unit
MDMediation Device.
MDFMain Distribution FrameFor interconnection of cables at   head-end.
MDNMobile Directory Number
MEAMedia Extension AdaptorUsed to extend an adapter or   card so that it fits inside a chassis.
MFmultifrequencySS7 Notation
MIBManagement Information BaseSNMP
MISManagement Information Systems
MMDSMultichannel Multipoint   Distribution Service
MMLMan   Machine Language.An ITU-T recommendation for the   man-machine interface to operation and maintenance functions in telephone   exchange.
MMOFMulti-Mode Optical Fibre
MNIBManagement Network Information   Base.
MOAManaged Object Agent
MORMulti-wavelength Optical   Repeater
MOSMean Opinion ScoreA Measure Of Voice Quality
MP-MLQMulti Pulse Maximum Likelihood   QuantisationVoice Compression Technology
MPEGMotion Picture Experts GroupA standard method for   compression of video signals
MPEG-1One standard of the MPEG family.   Typically used for computer video compression.
MPEG-2Another standard of the MPEG   family. Typically used for broadcast video compression.
MPLSMultiprotocol Label Switching
MSMobile StationHand held Unit (mobile handset)
MSMultiplex sectionSDH Domain
MSCMobile Switch Centreaka Mobile-service Switching   Centre
MSFCMultilayer Switch Feature Card
MSOMultiple   System Operator
MSOHMultiplexer Section Overhead
MSPMultiplexer Section Protection
MSSMultiple Subscription Services
MS-SPRINGMultiplexer Section Shared   Protection Ring
MSTMultiplex section termination
MSUmessage signal unitSS7 Notation
MTPmessage transfer partSS7 Notation
multimedia servicesTransmission of multiple   “media” (ie audio, video, data, image signals) over a single   communication line
NAPNetwork   Access Point
NASANational Aeronautics   and Space Administration
NATNetwork Address Translation
NDISNetwork Device Interface   Specification
NDSFNon-Dispersion Shifted Fibre
NENetwork ElementEquipment in the Network
NEMSNetwork Element Management   SystemVendor Software to control   network elements
NEXTNear End CrosstalkCopper cabling measurement   standard
NFSNetwork File System, (RFC-1094).
NFVNetwork Function Virtualisation
NFVINetwork Function Virtualisation Infrastructure
NFVONetwork Function Virtualisation Orchestrator
NICNetwork Interface Card
NIINational Information   Infrastructure
NIMNetwork   Interface Module
NISTNational Institute of   Standards and Technology
NLDNational Long Distance
NLDONational Long Distance Operator
NLDSCNational Long Distance Service   Code
NLSRNatural Language Speech   Recognition
NMSNetwork Management SystemVendor Software to control   network elements
NNINetwork node interface
NOCNetwork Operations Centre
nrt-VBRNon Real Time Variable Bit RateDescribes a quality of service   on ATM networks
NRZNon Return to Zero
NSFNational Science Foundation
NSNNational Significant Number
NTIANational   Telecommunications and Information Administration
NTPNational Telecom Policy
NTSCNational Television System   Committee
NVoDNear   Video on DemandVideo signal is transmitted over   telecommunications network. Allows the customer a selection of videos to   choose from at set times during the day, but doesn’t allow customer control   once the movie has started.
NZDSFNon-Zero Dispersion Shifted   Fibre
OAOptical AmplifierDWDM Domain
OADMOptical Add-drop Multiplexer
OAMOperation Administration and   Maintenance
OC-12622M/b/s (SONET transmission   rate)
OC-19210Gb/s (SONET transmission rate)
OC-3155Mb/s (SONET transmission   rate)
OC-482.5Gb/s (SONET transmission   rate)
OCHOptical Channel
ODNOpen   Data Network
ODPROptical Dedicated Protection   Ring
ODUOut-door UnitLMDS Domain
OJTOn Job Training
OLAOptical Line Amplifier
OLTEOptical Line Terminating   Equipment
OMAPoperations, maintenance, and   administration partSS7 Notation
OMCOperation & Maintenance   Centre
OMSOptical Multiplexer Section
OMSPOptical Multiplexer Shared   Protection
ONUOptical   Network Unit.Converts electrical signals to   optical signals for transmission over optical fibres
OPCoriginating point codeSS7 Notation
OPSOptical Protection Switching
OSCOptical Supervisory Channel
OSIOpen System Interconnection
OSPOutside Plant
OSSOperational Support SystemSoftware to control NEMS
OTAOffice   of Technology Assessment (U.S. Congress; closed 1995)
OTAFOver The Air activation Function
OTASPOver The Air Service   Provisioning
OTDROptical Time Domain   Reflectrometry
OTROptical Transport Repeater
OTTOver the TopMethod of delivering service over another service provider’s infrastructure (eg public Internet)
OXCOptical Cross Connect
PABXPrivate Automatic Branch   ExchangeSmall telephone network/switch   for customer premises.  It provides   local connectivity and switching coupled with connections to the public   carrier network.
PALPhase Alternation By Line
PAPPassword Authentication Protocol
PCPersonal   Computer
PCIPeripheral Component   Interconnect
PCIAPersonal Communications   Industry Association
PCSPersonal Communication Service
PDAPersonal Digital Assistant
PDHPlesiochronous Digital Hierarchy
PDSNPacket Data Switching Node
PFCPolicy Feature Card
PHSPersonal Handiphone Service
PLCProgrammable Logic Control
PMDPolarisation Mode Dispersion
PNNIPrivate Network to Network   Interface
POHPath overhead
POIPoint Of InterconnectInterconnect to other carriers’   networks
POPPoint of Presence
POTSPlain Old Telephone ServiceStandard telephone lines.   Originally designed to carry analogue information.
PPPath Protection
PPPPoint-to-Point Protocol
PPPPurchasing Power Parity
PPVPay Per View. The customer signs   up for and pays for access to specific programming.
PRAPrimary Rate AccessISDN Type
PRSPremium Rate ServiceTFN Service Type
PSTNPublic Switched Telephone   NetworkTelecommunications network
PSUPublic Sector Unit
PVCPermanent Virtual CircuitATM Domain
PVPPermanent Virtual PathATM Domain
QAMQuadrature Amplitude Modulation
QoSQuality of Service
R&DResearch   And Development
RAMRandom Access Memory
RANRadio Access Network
RASRemote Access ServerEquipment to allow remote   dial-up access to a network
RASRemote Access Switch
RBOCregional Bell operating companySS7 Notation
RCLrelease complete messageSS7 Notation
RCSResidential Cabling System
RDBMSRelational Database Management   System
RDNRelative distinguished name
reachthe maximum distance over which   a signal can be transmitted without significant degradation
RELrelease messageSS7 Notation
RFIReady for Installation
RICReliance Infocom
ROMRead Only Memory
RPCRemote Procedure Call   (RFC-1057).
RPERegular Pulse ExcitedVoice Compression Technology
RRPRecommended Retail Price
RSRegenerator section
RSOHRepeater Section Overhead
RSProute set prohibited test   messageSS7 Notation
RSRrestricted test messageSS7 Notation
RSTRegenerator section termination
RSVPResource Reservation Protocol
RTRemote TerminalLMDS Domain
RTIFRealizing the   Information Future (CSTB, 1994b)
RTURemote Testing UnitFibre Monitoring
RURack Units
RURemote UnitLMDS Domain
SASection adaptation
SANStorage Area Network
SARSegmentation And Re-assemblyAs used in network packets
SAXSmall Automatic ExchangeRemote CDMA
SBSStimulated Brillouin Scattering
SCCPsignaling connection control   partSS7 Notation
SCEService Creation EnvironmentIN Domain
SCPService Control PointIN Domain / SS7 Notation
SDCAShort Distance Charging Area
SDDCSoftware Defined Data Centre
SDHSynchronous Digital HierarchyITU-TSS international standard for transmission of high capacity digital signals (generally) over optical fibre.
SDMSpace Division Multiplexing
SDNSoftware Defined Networking
SDTVStandard Definition Television
SECAMSequential Couleur Avec Memoire
SEDSpatially Enabled Database
SFVNSecure Fast Virtual Networking
SIMSubscriber Identity Module
SLAService Level AgreementContract to ensure certain   service standards are met.
SLSsignaling link selectionSS7 Notation
SMASpectrum Management Agency
SMDSSwitched Multimegabit Data   Service
SMESmall Manufacturing Enterprise
SMESmall / Medium Enterprise
SMESubject Matter Expert
SMOFSingle Mode Optical Fibre
SMPService Management PointIN Domain
SMSShort Messaging Service
SMSCShort Messaging Service Center
SNCPSub-Network Connection   Protection
SNMPSimple Network Management   Protocol
SNRSignal to Noise Ratio
SOHSection overhead
SOHOSmall Office / Home Office
SONETSynchronous Optical NETwork is an American National Standards Institute   (ANSI) standard for transmission of high capacity digital signals over   optical fibre, used in the USA and Canada.
SPISDH physical interface
SPMSelf Phase Modulation
SPVPSwitched or Soft Permanent   Virtual PathATM Domain
SQLStructured Query Language
SRLStructural Return LossCopper cabling measurement   standard
SRSStimulated Raman Scattering
SS7Signalling System # 7SS7 Notation
SSPsignal switching PointSS7 Notation
SSUSynchronisation Supply UnitSynch Domain
STBSet-Top   Box
STDSubscriber Trunk Dialing
STMSynchronous transfer mode
STM-1155Mb/s (SDH transmission rate)SDH domain
STM-162.5Gb/s (SDH transmission rate)SDH domain
STM-4622Mb/s (SDH transmission rate)SDH domain
STM-6410Gb/s (SDH transmission rate)SDH domain
STPSignal Transfer PointSS7 Notation
STPShielded Twisted Pair is a generic name for any cable constructed   with a pair of twisted wires surrounded by a metallic shield.
STTSet-Top   Terminal
STUSet Top Unit. The box at the   customer premises that decodes signals sent from the head-end.
SUsignal unitSS7 Notation
T1A bandwidth unit (1.5 Mbps),   described when used for certain transfer protocols
T3A bandwidth unit (45 Mbps),   described when used for certain transfer protocols
TAPITelephony Application   Programming InterfaceFrom Microsoft & Intel.   Provides first party CTI
TbpsTerabits per second   (1,000,000,000,000 bps)
TCAPtransaction capabilities   application partSS7 Notation
TCPTransmission Control Protocol   (RFC-793).
TCP/IPTransmission Control Protocol /   Internet Protocol
TDMTime Division Multiplexing
TDMATime-Division Multiple Access
telecommunications trafficSignals (information) being   transmitted on telecommunications networks
TFAtransfer allowed messageSS7 Notation
TFPtransfer prohibited messageSS7 Notation
TFRtransfer restricted messageSS7 Notation
TGNOTrunk Group NumberTDM Domain
TM4.0Traffic Management 4.0ATM Forum’s traffic management   specification
TMNTelecommunications Management   Network
TMNTelecommunication Management   Network.Name of an area where   standardisation bodies such an ANSI, ITU-T and ETSI are currently defining   standards.
ToIPTelephony over IP. A method of   routing telephone calls through the Internet, rather than the PSTN   (telecommunications networks).
TPWGTechnology Policy Working Group
TRTrouble Report
TRATrouble Report Answer
TSTime SlotTDM Domain
TSAPITelephony Service Application   Program InterfaceFrom Novell & Lucent.   Provides third party CTI in a LAN environment and which uses CSTA
TSGTime Stage GroupTDM Domain
TTPTrail termination point
TUTributary unit
TUGTributary unit group
UBRUnspecified Bit RateDescribes a quality of service   on ATM networks
UDPUniversal Demarcation PointConverts optical signals to   electrical signals after transmission over optical fibres.
upstreamTransmission of information from   the customer to the service provider
URUnidirectional Ring
URLUniversal Resource Locator
UTPUnshielded Twisted Pair is a generic name for any cable consisting   of two twisted wires that are not surrounded by any shielding from the   potential effects of electromagnetic emissions.
V.35, X.21, EIA-530 and   G703/G.704Information Transfer protocols.   Styles of transmitting information over a network
V5Interface TypeTDM Domain
VANValue-Added   Network
VASValue Added Services
VBIVertical Blanking Interval
VBRVariable Bit RateDescribes a quality of service   on ATM networks
VCVirtual ContainerSDH “payload”
VCVirtual CircuitATM Domain
VC11Virtual ContainerCarries T1 SDH   “payload”
VC12Virtual ContainerCarries E1 SDH   “payload”
VC3Virtual ContainerCarries T3 SDH   “payload”
VC4Virtual ContainerCarries STM1 SDH   “payload”
VC4-4CVirtual ContainerCarries 4 x VC4 (to aggregate   STM4) SDH “payload”
VCIVirtual Circuit IdentifierATM Domain
VDSLVery High Speed Digital   Subscriber Lines. Information Transfer protocol. One style of transmitting   information over a network. Similar to ADSL, but supports larger bandwidths.
Video conferenceTransmission of video and audio   signals over telecommunications networks.
VIMVirtualised Infrastructure Manager
VIPvideo information provider
VLANVirtual Local Area Network (LAN)
VLRVisitor Location Register
VMSVoice Mail Service
VNFVirtual Network Function
VNFMVirtual Network Function Manager
VoATMVoice over ATM
VoDVideo on DemandVideo signal is transmitted over   telecommunications network and allows the customer full control (fast   forward, rewind, pause, etc). Allows the customer a selection of videos to   choose from.
VoFRVoice over Frame Relay
voice mailRecords messages when someone is   not able to answer their phone.
VoIPVoice over IP
VPVirtual PathATM Domain
VPIVirtual Path IdentifierATM Domain
VPI/VCIVirtual Path Identifier /   Virtual Circuit IdentifierATM Domain
VPNVirtual   Private NetworkSegregates network for   individual client groups.
VPRNVirtual Private Remote NetworkCreates multi-protocol VPNs via   the Internet
VSATVery Small Aperture Terminal
VSBVestigial   Side Band
VTVirtual Tributary
WANWide Area Network
WANWide Area Network is a network which encompasses   inter-connectivity between devices over a wide geographical area.  Such networks generally require access to   the public network and operate over long distances.
WCSWireless   Control System
WDMWavelength Division Multiplexing
WDVWritten Down ValueFinancial (depreciation) term
WebWorld   Wide Web
Web TVAllows access to the World Wide   Web (an Internet service), using a television.
WINWireless Intelligent Network
WINFWINForum; Wireless   Information Networks Forum
WIOZTerminal support application in   XMATE.
WLLWireless in Local Loop
WWWWorld Wide Web
WYSIWYGWhat You See Is What You Get
X.25 PLPX.25 Packet Level Protocol,   layer 3 of ITU-T X.25.
X.29ITU-T   X.29recommendations for the   interwork between a packet-mode DTE and a non packet-mode DTE in a packet   switched transmission environment.
xDSLDescribes the family of DSL   technologies (eg ADSL, VDSL, etc)
XMATEeXchange MAnagement TErminal.
XPMCross Phase Modulation


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