OSS Acronyms / Glossary

Acronym Full Description Extra Details
A links access links SS7 Notation
AAA Authentication Authorization and   Accounting
AAL ATM Adaption Layer
ABR Available Bit Rate. Describes a   quality of service on ATM networks
ACD Automatic Call Distribution
ACE ATM Circuit Emulation
ACELP Algebraic CELP Voice Compression Technology
ACM address complete message SS7 Notation
ACR Attenutation to Crosstalk Ratio Copper cabling measurement   standard
ACS Access Control and Security
active   equipment The electronic equipment that   generates, transmits and receives signals to & from a telecommunications   network.
ADM Add-drop Multiplexer SDH Equipment Type
ADPCM Adaptive Differential Pulse Code   Modulation Voice Compression Technology
ADSL Asymmetric Digital Subscriber   Line Information Transfer protocol.   One style of transmitting information over a network
AGS Advanced Gaming Service
AIS Alarm Indication Signal
ANM answer message SS7 Notation
APS Automatic Protection Switching
ARDIS Advanced Radio Data   Information Service
ARPU Average Revenue per user
ASIC Application Specific Integrated   Circuit
ASN.1 Abstract syntax notation one
ATC Adaptive Transform Coding Voice Compression Technology
ATIS Alliance for   Telecommunications Industry Solutions
ATM Asynchronous Transfer Mode Transmission 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.
AU Administrative unit
AUC Authentication Centre
AUG AU group
B links bridge links SS7 Notation
Bandwidth The amount of data transmitted,   usually referred to in units of bps)
BAS Building Automation System
BDLA Bidirectional Line Amplifier
BDSL Broadband Digital Subscriber   Line
BER Bit Error Rate
BIB backward indicator bit SS7 Notation
bits Discrete pieces of digital   information
BLSR Bidirectional Line Switched Ring
bps bits per second. The rate at   which digital information is sent
BR Bidirectional Ring
BRA Basic Rate Access ISDN Type
broadband services A 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”
BSC Base Station Controller
BSN backward sequence number SS7 Notation
BTS Base Transceiver Station
CAC Carrier Access Code
CAN Customer Access Network
carriers Also known as telecommunications   carriers or telcos. Well known examples are Telstra and Optus
CAT Committee on Applications   and Technology
CAT-5 Category 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.
CATV Common Antenna TeleVision (also   known as Cable TV)
CB Citizen Band
CB Call Barring
CBR Constant Bit Rate Eg. Describes a quality of   service on ATM networks
CBT Computer Based Training
CC Call Conferencing
CC7 Common Channel Signalling # 7 TDM Domain
CCITT Consultative Committee on   International Telegraphy and Telephony
CCR Call Charging Record.
CCS7 Common Channel Signalling # 7 TDM Domain
CCTV Closed Circuit Television
CD Chromatic Dispersion
CD Compact Disk.
CD Call Diversion
CDE Common Desktop Environment.
CDMA Code Division Multiple Access
CDPD Cellular Digital Packet Data
CELP Code Excited Linear Predictive Voice Compression Technology
CF Call Forwarding
CH/CW Call Hold / Call Waiting
CHAP Cryptographic Handshake   Authentication Protocol
CI Configuration item ITIL terminology
CIC Committee on Information   and Communications
CIF Cell in Frames ATM over Ethernet & Token   Ring LANs
CLI Calling Line Identification Shows incoming caller number or   ID
CLIP Calling Line Identification   Presentation Shows incoming caller number or   ID
CLIR Calling Line Identification   Restriction
CLNP Connection Less Network Protocol
CM Configuration Management
CMS Call Management Services
CMTS Cellular Mobile Telephone   Service
CNM Customer Network Management
COC Council on Competitiveness
COMPLEC Competitive Local Exchange   Carrier
conductor A metallic wire designed to   carry signals (eg copper telephone lines).
CONS Connection-Mode Network service.
CORBA Common Object Request   Broker Architecture System interface technique
CP Connection point
CPE Customer Premises Equipment eg modems, routers, etc at   customer premises
CPLD Complex Programmable Logic   Device
CPU Central Processing Unit
CRM Customer Resource Management
CRT Class Room Training
CS Caesium Clock Synch Domain
CS-ACELP Conjugate structure Algebraic   CELP Voice Compression Technology
CSMA/CD Carrier Sense Multiple Access   with Collision Detection
CSN Control System Network
CSPP Computer Systems Policy Project
CSTA Computer Supported   Telecommunications Applications From ECMA. Defines application   level CTI functions
CSTB Computer Science and   Telecommunications Board
CT Call Tracing
CTIA Cellular   Telecommunications Industry Association
CTP Connection termination point
D links diagonal links SS7 Notation
DAS Dual Attachment Station FDDI Notation
DB Database
DBS Direct Broadcast Satellite
DCF Dispersion Compensating Fibre
DCG Dispersion Compensating Grating
DCME Digital Circuit Multiplication   Equipment Voice Compression Technology
DCN Data Control Network A network used to carry network management traffic
DCS Digital Cross-connect System   (qv. DXC)
DCS Data Communication Server in   XMATE.
DDF Digital Distribution Frame For interconnection of cables at   head-end.
DDS Digital Data Service
DECT Digital Enhanced Cordless   Telecommunications
DES Data Encryption Software
DET Digital Entertainment Terminal
DHCP Dynamic Host Configuration   Protocol
DIU Digital Interface Unit TDM Domain
DLCI Data Link Connection Identifier ISDN “Circuit”   identifier
DMA Direct Memory Access
DNS Domain Name Server
DOCSIS Data Over Cable   Service Interface Specification
DOD Department   of Defense
DOE Department   of Energy
DOS Disk Operating System
DoT Department Of Telecommunication
downstream Transmission of information from   the service provider to the customer
DPC destination point code SS7 Notation
DPNSS Digital Private Network   Signaling System
DRP Disaster Recovery Plan
DS Digital section
DS1 A bandwidth unit (1.5 Mbps),   described when used for certain transfer protocols
DS3 A bandwidth unit (45 Mbps),   described when used for certain transfer protocols
DSF Dispersion Shifted Fibre
DSL Digital Subscriber Lines
DSLAM Digital Subscriber Line Access   Multiplexer ADSL Domain
DSS Decision Support System
DVB Digital Video Broadcasting.   Transmission of digital video signals
DWDM Dense Wavelength Division   Multiplexing DWDM Domain
DXC Digital Cross Connect
E link extended link SS7 Notation
E1 A bandwidth unit (2.048 Mbps),   described when used for certain transfer protocols
E3 A bandwidth unit (34 Mbps),   described when used for certain transfer protocols
EA Equal Access TFN Service Type
easement Piece of land in which cables,   conduits, etc can be placed.
EC Emergency Correction.
EDFA Erbium Dope Fibre Amplifier
EDI Electronic Data Interchange
EIA Electronic Industries   Association
EMDF Enhanced Main Distribution Frame A LAN distribution frame where   cables and LAN ports are patched.
EMS Element Management System
EPP Emergency Power Plant
ET End Terminal DWDM Domain
Ethernet A local area network (LAN) protocol. One style of transmitting information over a local area network.
F link fully associated link SS7 Notation
FAD Full Add Drop DWDM Domain
FCAPS Faults, Configuration,   Accounting, Performance, Security management
FCC Federal Communications   Commission
FDDI Fibre Distributed Data Interface
FDP fibre distribution points. Point   of interconnect of cables. Allows distribution of signal from head-end to a   customer or customers.
FE Fast Ethernet
FEC Forward Error Correction
FEP Front End Processor
FERF Far end receive failure
FIB forward indicator bit SS7 Notation
FISU fill in signal unit SS7 Notation
FM Facilities Management.   Management and coordination of telecommunications equipment.
FMCG Fast Moving Consumer Goods
FMO Future Mode of Operation   (Telstra)
FMS File Management Subsystem in   AXE.
FMS Fibre Monitoring System
FO Optical fibre
FOA Fixed Optical Attenuator
FPGA Field Programmable Gate Array
FPU File Process Utility in AXE.
FR Frame Relay TFN Service Type
Frame Relay Information Transfer protocol.   One style of transmitting information over a network
FSAN Full Services Access Network. A   network capable of carrying all forms of information with varying bandwidths   and urgency of transmission.
FSN forward sequence number SS7 Notation
FSP Fixed Line Service Provider
FTAM File Transfer, Access and   Management (ISO 8571).
FTP File Transfer Protocol
FTTC Fibre 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).
FTTH Fibre To The Home. A style of   cable network, where optical fibre carries signals from the head-end all the   way to the home.
FWM Four Wave Mixing
Gbps Gigabits per second   (1,000,000,000 bps)
GDMO Guidelines for the definition of   managed objects
GDP Gross Domestic Product
Gigabit Ethernet Similar to 10BaseT Ethernet,   except with a theoretical bandwidth of 1Gbps instead of 10Mbps.
GII Global Information   Infrastructure
GILS Government Information   Locator Service
GPRS General Packet Radio Service
GPS Global Positioning System Synch Domain
GSM Global System for Mobile   Communications
GSSI Government Services   Information Infrastructure
GST Goods and Services Tax
GUI Graphical User Interface
HCT home communications terminal
HDSL High-Bit-Rate Digital   Subscriber Line
HDTV High-Definition Television The next generation of   television. Provides greater picture resolution than current television   signals.
HFC Hybrid Fibre / Coaxial  A style of cable network. Makes use of both   optical fibre and coaxial cables to guide information from one point to   another.
HLR Home Location Register
HPA Higher order path adaptation
HPC Higher order path connection
HPCCI High   Performance Computing and Communications Initiative
HPT Higher order path termination
HT Hub Terminal LMDS Domain
HTML Hypertext Markup Language
HU Hub Unit LMDS Domain
IA Indirect adaptor
IAM initial address message SS7 Notation
IBS Integrated Business System
IC Integrated Circuit
IDC Internet Data Centre
IDU In-door Unit LMDS Domain
IEEE Institute for   Electrical and Electronics Engineers
IETF Internet Engineering Task Force
IFL Interfacility Link LMDS Domain
IHS Information Handling Server in   XMATE.
IISP Information   Infrastructure Standards Panel
IITF Information Infrastructure   Task Force
ILD International Long Distance
IMA Interactive Multimedia   Association
IMBE Improved MBE Voice Compression Technology
IN Intelligent Network TDM Domain
integration of voice, video   and data Previously 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.
IO Input / Output AMAS Domain
IP Internet Protocol (RFC-791).
IPC Inter Process Communication.
IS Information   Systems
ISD International Subscriber Dialing
ISDN Integrated Services Digital   Network International standard that   defines a digital end-to-end network that can support voice, data, image and   video simultaneously
ISL Internetworking Swich Link
ISP Inside Plant
ISP Internet Service Provider Allows customers access to the   Internet and Internet facilities.
ISUP ISDN user part SS7 Notation
IT Information Technology
ITIL Information Technology   Infrastructure Library
ITS Intelligent Transportation   System
ITU International   Telecommunications Union
ITU-TSS International 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.
IVR Interactive Voice Response
IXC Interexchange   Carrier
JDBC A SUN JAVA standard for   connecting client applications to external databases
JTAPI Java Telephony API From Sun Microsystems, Lucent,   et al. Provides CTI in either 1st or 3rd party environment
kbps Kilobits per second (1,000 bps)
Kiosk An information outlet, similar   to Automatic Teller Machines
LAN Local 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
LAN Local Area Network Small networks of computers,   usually in office or campus environments.
LAN interconnect services Allows communications between   different information transfer protocols
LAPB Link Access Procedure, Balanced Data link layer protocol in the   X.25 protocol stack. LAPB is a bit-oriented protocol derived from HDLC
LATA Local Access And Transport Area
LC Logical Channel
LDAP Lightweight Directory Access   Protocol
LDCA Long Distance Charge Area
LD-CELP Low delay CELP Voice Compression Technology
LDS Leased Data Service TFN Service Type
LEC Local   Exchange Carrier
LEO Low   Earth Orbit Satellite
LES/BUS LAN Emulation Software &   Broadcast Unknown Server
LL Logical Link
LLC Logical Link Control standards.
LMB Large Megabit Bearer Telstra service
LMDS Local Multipoint Distribution   Service LMDS Domain
LOF Loss of frame
LOP Loss of pointer
LOS Loss of signal
LPA Lower order path adaptation
LPC Lower order path connection
LPT Lower order path termination
LSSU link status signal unit SS7 Notation
LTE Line Terminal Equipment
LTG Line Trunk Group TDM Domain
LTU Line Trunk Unit TDM Domain
LVP Logical Virtual Path ADSL Domain
M2M Machine to Machine
MAC Media Access Control
MAN Metropolitan Area Network
MANO Management and Orchestration NFV functional component
MBE Multiband Excitation Voice Compression Technology
Mbps Megabits per second
MCN Media Conversion Node
MCU Metered Call Unit
MD Mediation Device.
MDF Main Distribution Frame For interconnection of cables at   head-end.
MDN Mobile Directory Number
MEA Media Extension Adaptor Used to extend an adapter or   card so that it fits inside a chassis.
MF multifrequency SS7 Notation
MIB Management Information Base SNMP
MIS Management Information Systems
MMDS Multichannel Multipoint   Distribution Service
MML Man   Machine Language. An ITU-T recommendation for the   man-machine interface to operation and maintenance functions in telephone   exchange.
MMOF Multi-Mode Optical Fibre
MNIB Management Network Information   Base.
MOA Managed Object Agent
MOR Multi-wavelength Optical   Repeater
MOS Mean Opinion Score A Measure Of Voice Quality
MP-MLQ Multi Pulse Maximum Likelihood   Quantisation Voice Compression Technology
MPEG Motion Picture Experts Group A standard method for   compression of video signals
MPEG-1 One standard of the MPEG family.   Typically used for computer video compression.
MPEG-2 Another standard of the MPEG   family. Typically used for broadcast video compression.
MPLS Multiprotocol Label Switching
MS Mobile Station Hand held Unit (mobile handset)
MS Multiplex section SDH Domain
MSC Mobile Switch Centre aka Mobile-service Switching   Centre
MSFC Multilayer Switch Feature Card
MSO Multiple   System Operator
MSOH Multiplexer Section Overhead
MSP Multiplexer Section Protection
MSS Multiple Subscription Services
MS-SPRING Multiplexer Section Shared   Protection Ring
MST Multiplex section termination
MSU message signal unit SS7 Notation
MTP message transfer part SS7 Notation
multimedia services Transmission of multiple   “media” (ie audio, video, data, image signals) over a single   communication line
NAP Network   Access Point
NASA National Aeronautics   and Space Administration
NAT Network Address Translation
NDIS Network Device Interface   Specification
NDSF Non-Dispersion Shifted Fibre
NE Network Element Equipment in the Network
NEMS Network Element Management   System Vendor Software to control   network elements
NEXT Near End Crosstalk Copper cabling measurement   standard
NFS Network File System, (RFC-1094).
NFV Network Function Virtualisation
NFVI Network Function Virtualisation Infrastructure
NFVO Network Function Virtualisation Orchestrator
NIC Network Interface Card
NII National Information   Infrastructure
NIM Network   Interface Module
NIST National Institute of   Standards and Technology
NLD National Long Distance
NLDO National Long Distance Operator
NLDSC National Long Distance Service   Code
NLSR Natural Language Speech   Recognition
NMS Network Management System Vendor Software to control   network elements
NNI Network node interface
NOC Network Operations Centre
nrt-VBR Non Real Time Variable Bit Rate Describes a quality of service   on ATM networks
NRZ Non Return to Zero
NSF National Science Foundation
NSN National Significant Number
NTIA National   Telecommunications and Information Administration
NTP National Telecom Policy
NTSC National Television System   Committee
NVoD Near   Video on Demand Video 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.
NZDSF Non-Zero Dispersion Shifted   Fibre
OA Optical Amplifier DWDM Domain
OADM Optical Add-drop Multiplexer
OAM Operation Administration and   Maintenance
OC-12 622M/b/s (SONET transmission   rate)
OC-192 10Gb/s (SONET transmission rate)
OC-3 155Mb/s (SONET transmission   rate)
OC-48 2.5Gb/s (SONET transmission   rate)
OCH Optical Channel
ODN Open   Data Network
ODPR Optical Dedicated Protection   Ring
ODU Out-door Unit LMDS Domain
OJT On Job Training
OLA Optical Line Amplifier
OLTE Optical Line Terminating   Equipment
OMAP operations, maintenance, and   administration part SS7 Notation
OMC Operation & Maintenance   Centre
OMS Optical Multiplexer Section
OMSP Optical Multiplexer Shared   Protection
ONU Optical   Network Unit. Converts electrical signals to   optical signals for transmission over optical fibres
OPC originating point code SS7 Notation
OPS Optical Protection Switching
OSC Optical Supervisory Channel
OSI Open System Interconnection
OSP Outside Plant
OSS Operational Support System Software to control NEMS
OTA Office   of Technology Assessment (U.S. Congress; closed 1995)
OTAF Over The Air activation Function
OTASP Over The Air Service   Provisioning
OTDR Optical Time Domain   Reflectrometry
OTR Optical Transport Repeater
OTT Over the Top Method of delivering service over another service provider’s infrastructure (eg public Internet)
OXC Optical Cross Connect
PABX Private Automatic Branch   Exchange Small telephone network/switch   for customer premises.  It provides   local connectivity and switching coupled with connections to the public   carrier network.
PAL Phase Alternation By Line
PAP Password Authentication Protocol
PC Personal   Computer
PCI Peripheral Component   Interconnect
PCIA Personal Communications   Industry Association
PCS Personal Communication Service
PDA Personal Digital Assistant
PDH Plesiochronous Digital Hierarchy
PDSN Packet Data Switching Node
PFC Policy Feature Card
PHS Personal Handiphone Service
PLC Programmable Logic Control
PMD Polarisation Mode Dispersion
PNNI Private Network to Network   Interface
POH Path overhead
POI Point Of Interconnect Interconnect to other carriers’   networks
POP Point of Presence
POTS Plain Old Telephone Service Standard telephone lines.   Originally designed to carry analogue information.
PP Path Protection
PPP Point-to-Point Protocol
PPP Purchasing Power Parity
PPV Pay Per View. The customer signs   up for and pays for access to specific programming.
PRA Primary Rate Access ISDN Type
PRS Premium Rate Service TFN Service Type
PSTN Public Switched Telephone   Network Telecommunications network
PSU Public Sector Unit
PVC Permanent Virtual Circuit ATM Domain
PVP Permanent Virtual Path ATM Domain
QAM Quadrature Amplitude Modulation
QoS Quality of Service
R&D Research   And Development
RAM Random Access Memory
RAN Radio Access Network
RAS Remote Access Server Equipment to allow remote   dial-up access to a network
RAS Remote Access Switch
RBOC regional Bell operating company SS7 Notation
RCL release complete message SS7 Notation
RCS Residential Cabling System
RDBMS Relational Database Management   System
RDN Relative distinguished name
reach the maximum distance over which   a signal can be transmitted without significant degradation
REL release message SS7 Notation
RFI Ready for Installation
RIC Reliance Infocom
ROM Read Only Memory
RPC Remote Procedure Call   (RFC-1057).
RPE Regular Pulse Excited Voice Compression Technology
RRP Recommended Retail Price
RS Regenerator section
RSOH Repeater Section Overhead
RSP route set prohibited test   message SS7 Notation
RSR restricted test message SS7 Notation
RST Regenerator section termination
RSVP Resource Reservation Protocol
RT Remote Terminal LMDS Domain
RTIF Realizing the   Information Future (CSTB, 1994b)
RTU Remote Testing Unit Fibre Monitoring
RU Rack Units
RU Remote Unit LMDS Domain
RX Receive/Receiver
SA Section adaptation
SAN Storage Area Network
SAR Segmentation And Re-assembly As used in network packets
SAX Small Automatic Exchange Remote CDMA
SBS Stimulated Brillouin Scattering
SCCP signaling connection control   part SS7 Notation
SCE Service Creation Environment IN Domain
SCP Service Control Point IN Domain / SS7 Notation
SDCA Short Distance Charging Area
SDDC Software Defined Data Centre
SDH Synchronous Digital Hierarchy ITU-TSS international standard for transmission of high capacity digital signals (generally) over optical fibre.
SDM Space Division Multiplexing
SDN Software Defined Networking
SDTV Standard Definition Television
SECAM Sequential Couleur Avec Memoire
SED Spatially Enabled Database
SFVN Secure Fast Virtual Networking
SIM Subscriber Identity Module
SLA Service Level Agreement Contract to ensure certain   service standards are met.
SLS signaling link selection SS7 Notation
SMA Spectrum Management Agency
SMDS Switched Multimegabit Data   Service
SME Small Manufacturing Enterprise
SME Small / Medium Enterprise
SME Subject Matter Expert
SMOF Single Mode Optical Fibre
SMP Service Management Point IN Domain
SMS Short Messaging Service
SMSC Short Messaging Service Center
SNCP Sub-Network Connection   Protection
SNMP Simple Network Management   Protocol
SNR Signal to Noise Ratio
SOH Section overhead
SOHO Small Office / Home Office
SONET Synchronous 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.
SPI SDH physical interface
SPM Self Phase Modulation
SPVP Switched or Soft Permanent   Virtual Path ATM Domain
SQL Structured Query Language
SRL Structural Return Loss Copper cabling measurement   standard
SRS Stimulated Raman Scattering
SS7 Signalling System # 7 SS7 Notation
SSP signal switching Point SS7 Notation
SSU Synchronisation Supply Unit Synch Domain
STB Set-Top   Box
STD Subscriber Trunk Dialing
STM Synchronous transfer mode
STM-1 155Mb/s (SDH transmission rate) SDH domain
STM-16 2.5Gb/s (SDH transmission rate) SDH domain
STM-4 622Mb/s (SDH transmission rate) SDH domain
STM-64 10Gb/s (SDH transmission rate) SDH domain
STP Signal Transfer Point SS7 Notation
STP Shielded Twisted Pair  is a generic name for any cable constructed   with a pair of twisted wires surrounded by a metallic shield.
STT Set-Top   Terminal
STU Set Top Unit. The box at the   customer premises that decodes signals sent from the head-end.
SU signal unit SS7 Notation
T1 A bandwidth unit (1.5 Mbps),   described when used for certain transfer protocols
T3 A bandwidth unit (45 Mbps),   described when used for certain transfer protocols
TAPI Telephony Application   Programming Interface From Microsoft & Intel.   Provides first party CTI
Tbps Terabits per second   (1,000,000,000,000 bps)
TCAP transaction capabilities   application part SS7 Notation
TCP Transmission Control Protocol   (RFC-793).
TCP/IP Transmission Control Protocol /   Internet Protocol
TDM Time Division Multiplexing
TDMA Time-Division Multiple Access
telecommunications traffic Signals (information) being   transmitted on telecommunications networks
TFA transfer allowed message SS7 Notation
TFP transfer prohibited message SS7 Notation
TFR transfer restricted message SS7 Notation
TGNO Trunk Group Number TDM Domain
TM4.0 Traffic Management 4.0 ATM Forum’s traffic management   specification
TMN Telecommunications Management   Network
TMN Telecommunication Management   Network. Name of an area where   standardisation bodies such an ANSI, ITU-T and ETSI are currently defining   standards.
ToIP Telephony over IP. A method of   routing telephone calls through the Internet, rather than the PSTN   (telecommunications networks).
TPWG Technology Policy Working Group
TR Trouble Report
TRA Trouble Report Answer
TS Time Slot TDM Domain
TSAPI Telephony Service Application   Program Interface From Novell & Lucent.   Provides third party CTI in a LAN environment and which uses CSTA
TSG Time Stage Group TDM Domain
TTP Trail termination point
TU Tributary unit
TUG Tributary unit group
TX Transmit/Transmitter
UBR Unspecified Bit Rate Describes a quality of service   on ATM networks
UDP Universal Demarcation Point Converts optical signals to   electrical signals after transmission over optical fibres.
upstream Transmission of information from   the customer to the service provider
UR Unidirectional Ring
URL Universal Resource Locator
UTP Unshielded 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.704 Information Transfer protocols.   Styles of transmitting information over a network
V5 Interface Type TDM Domain
VAN Value-Added   Network
VAS Value Added Services
VBI Vertical Blanking Interval
VBR Variable Bit Rate Describes a quality of service   on ATM networks
VC Virtual Container SDH “payload”
VC Virtual Circuit ATM Domain
VC11 Virtual Container Carries T1 SDH   “payload”
VC12 Virtual Container Carries E1 SDH   “payload”
VC3 Virtual Container Carries T3 SDH   “payload”
VC4 Virtual Container Carries STM1 SDH   “payload”
VC4-4C Virtual Container Carries 4 x VC4 (to aggregate   STM4) SDH “payload”
VCI Virtual Circuit Identifier ATM Domain
VDSL Very High Speed Digital   Subscriber Lines. Information Transfer protocol. One style of transmitting   information over a network. Similar to ADSL, but supports larger bandwidths.
Video conference Transmission of video and audio   signals over telecommunications networks.
VIM Virtualised Infrastructure Manager
VIP video information provider
VLAN Virtual Local Area Network (LAN)
VLR Visitor Location Register
VMS Voice Mail Service
VNF Virtual Network Function
VNFM Virtual Network Function Manager
VoATM Voice over ATM
VoD Video on Demand Video 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.
VoFR Voice over Frame Relay
voice mail Records messages when someone is   not able to answer their phone.
VoIP Voice over IP
VP Virtual Path ATM Domain
VPI Virtual Path Identifier ATM Domain
VPI/VCI Virtual Path Identifier /   Virtual Circuit Identifier ATM Domain
VPN Virtual   Private Network Segregates network for   individual client groups.
VPRN Virtual Private Remote Network Creates multi-protocol VPNs via   the Internet
VSAT Very Small Aperture Terminal
VSB Vestigial   Side Band
VT Virtual Tributary
WAN Wide Area Network
WAN Wide 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.
WCS Wireless   Control System
WDM Wavelength Division Multiplexing
WDV Written Down Value Financial (depreciation) term
Web World   Wide Web
Web TV Allows access to the World Wide   Web (an Internet service), using a television.
WIN Wireless Intelligent Network
WINF WINForum; Wireless   Information Networks Forum
WIOZ Terminal support application in   XMATE.
WLL Wireless in Local Loop
WWW World Wide Web
WYSIWYG What You See Is What You Get
X.25 PLP X.25 Packet Level Protocol,   layer 3 of ITU-T X.25.
X.29 ITU-T   X.29 recommendations for the   interwork between a packet-mode DTE and a non packet-mode DTE in a packet   switched transmission environment.
xDSL Describes the family of DSL   technologies (eg ADSL, VDSL, etc)
XMATE eXchange MAnagement TErminal.
XPM Cross Phase Modulation


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