COMMUNICATIONS STANDARDS REVIEW

CSR ACRONYM DEFINITIONS

This file has not been updated since July 2002. We are no longer keeping it current.

S-Z

More Acronym Definitions:

  • A-D

  • E-H

  • I-M

  • N-R

    -S-
    S&R Segmentation and Re-assembly
    S/ATT Satellite Analog Tie Trunk (TIA-646-B)
    S/DTT Satellite Digital Tie Trunk (TIA-646-B)
    S/MIME Secure / Multipurpose Internet Mail Extensions
    S/N Signal-to-Noise
    S/T Logical interface between xTU-R and user terminal equipment
    S/W Software
    SA1 Systems Aspects - Services (3GPP Committee)
    SAA-AMS Service Aspects and Applications - Audio/Visual Multimedia Services
    SAAC Syntax-Based Adaptive Arithmetic Coding
    SABM Set Asynchronous Balanced Mode
    SABME Set Asynchronous Balanced Mode Extended
    SABT Simplified ABT
    SAC Service Access Code
    SAC Subscriber Access Control
    SAC Syntax-based Arithmetic Coding
    SACCHSlow Associated Control Channel
    SAD Sum of Absolute Differences
    SAE Society of Automotive Engineers
    SAFE SeAmless, Fixed-overhead Efficient (framing)
    SAFER Secure and Fast Encryption Routine
    SAGE Security Algorithms Group of Experts
    SAID Serving Area ID
    SAM Synchronous Access Mode (V.80)
    SAMPSimple Audio Multiplexing Protocol
    SAMPS System Assisted Mobile Positioning through Satellite (TDMA Third Generation Wireless)
    SANC Signaling Area Network Code
    SAP Segmentation Application Part
    SAP Service Access Point
    SAP System Application Procedure
    SAPI Service Access Point Identifier
    SAR Segmentation And Re-assembly
    SAR Specific Absorption Rate
    SAS Smart Antenna Savvy
    SAS Subscriber Alerting Signal
    SASET Secure Audio SET
    SAT Satellite
    SAT Satellite ATM
    SATN Signal Attenuation
    SAVD Simultaneous or Alternating Voice Data
    SBC Southern Building Code
    S-BCCHShort Message Service Broadcast Control Channel
    SBE Single Byte Extension
    SBI Sub-Bitstream Indicators
    SBID Stuff Bit ID
    SBM Single Bitmap
    SBM Subnet Bandwidth Manager
    SBSD Supplementary and Bearer Service Description (T1S1)
    SC Service Capability
    SC Service Control
    SC Special Committee (ETSI)
    SCSpectral Compatibility
    SC Steering Committee
    SC Subscriber Confidentiality
    SC Type of commercial fiber optic connector (Push-Pull)
    SCA Selective Call Acceptance
    SCaps Capabilities with Sub-fields
    SCC Standards Coordinating Committee (IEEE)
    SCC Standards Council of Canada
    SCCC Serial Concatenated Convolutional Code
    SCCH Single Cell Control Channel
    SCCP Signaling Connection Control Part (SS7)
    SCD Service Capability Definition
    S-CDMASynchronous CDMA
    SCELP Spike Code Excited Linear Prediction
    SCF Service Control Function
    SCF Shared Control with Feedback
    SCF Supervisory and Control Function
    SCF Synchronization and Convergence Function
    SCF System Communication Function
    SCM Single-Carrier Modulation
    SCM Station Class Mark
    SCM Sub-Carrier Multiplexing
    SCN Switched Circuit Network
    SCOT Steering Committee on Telecommunications
    SCP Service Control Point
    SCPS Authorized Call Priority Service
    SCR Selective Call Rejection
    SCSA Signal Computing System Architecture
    SCSC SubCommittee on Standards and Conformance (APEC)
    SCSI Small Computer System Interface
    SCT Strathclyde Compression Transform
    SCT Simple Control Transmission Protocol
    SCT Mexican Ministry of Communications and Transports
    SCTE Society of Cable Television Engineers (US)
    ScTP Screened Twisted Pair
    SCTP Stream Control Transmission Protocol
    SCV Specialized Codec VBR
    SD Spectral Data
    SD Super Domain
    SDB Switched Digital Broadcast
    SDC Supplier's Declaration of Conformity (also SDOC)
    SDCC Supplementary Digital Color Code
    SDCCHStandalone Dedicated Control Channel
    SDD Stutter Dialing Device
    SDF System Directory Function
    SDH Synchronous Digital Hierarchy
    SDK Software Development Kit
    SDL Structure Description Language
    SDMT Synchronized DMT
    SDO Standards Development Organization
    SDoC Suppliers Declaration of Conformity (also SDC)
    SDP Session Description Protocol
    SDPng SDP Next Generation
    SDR Sequence Determined Redundancy
    SDSAF Switched Digital Services Applications Forum
    SDSL Simultaneous DSL
    SDSL Symmetrical high bit rate Digital Subscriber Line
    SDSS Server Display And Script Services
    SDT Stutter Dial Tone
    SDTVStandard Definition Television
    SDU Service Data Unit
    SE Synchronous Editing
    SEAD Software Encryption Algorithm for Data Services
    SEBCH Systematic Extended Bose, Chaudhuri, and Hocquengham
    SEC ETSI Security Technical Committee
    SECOFI Mexican Ministry of Commerce and Industrial Development
    SEI Supplemental Enhancement Information
    SELT Single-Ended Loop Testing
    SELV Low Voltage associated with digital circuits (IEC 950)
    SEP Selective Polling (T.30)
    SERVNOT Service Notification
    SES Severely Errored Second
    SES Standards Engineering Society
    SET Simple Endpoint Types
    SF Single Frequency
    SF Superframe
    SF Synchronization Flag
    SfDLy Superframe reconfiguration Delay number (Q4/15)
    SFF Small Form Factor
    SFlgSfSynch Flag Superframe number (Q4/15)
    SFRSpecial Function Registers
    SGSignaling Gateway
    SGStarter Group (ETSI)
    SG Study Group (ITU)
    SGCISimple Gateway Control Interface
    SGCP Simple Gateway Control Protocol
    SGFS Special Group for Functional Standards
    SGMM MultiMedia Study Group
    SGSN Serving GPRS Support Node
    SHA Secure Hash Algorithm
    SHDSL Single-line High Speed DSL
    SHO Soft Handoff
    SHTU-RSHDSL Handshake Transceiver Unit - Remote
    SI Sensitivity Information
    SI Signaling Intelligence
    SI Still Image
    SIA Security Industry Association
    SIA Semiconductor Industry Association
    SID Send Identifier
    SID Silence Insertion Descriptor
    SID System Identification
    SIF Standard Interchange Format
    SIG Special Interest Group
    SIGTRAN Signaling transport (IETF)
    SIM Subscriber Identity Module
    SIMD Single-Instruction, Multiple Data
    SIN System Identification Network
    SIO Scientific or Industrial Organization (ITU member)
    SIP Session Initiation Protocol (IETF)
    SIPPING Session Initiation Protocol Project INvestiGation (IETF WG)
    SIPTEL Session Initiation Profile for Internet Telephony, an IETF BoF group, which was a precurser to the IETF Working Group iptel (IP Telephony)
    SIR Signal to Interference Ratio
    SIRD Service Independent Requirements Definition
    SIT Special Information Tone
    SIU Subscriber Interface Unit
    SLA Service Level Agreement
    SLB Sequential Link Bring-up (V.MoIP)
    SLC Subscriber Loop Carrier
    SLC Start of Layer Data
    SLD Second Level Domain
    SLE Screen List Editing
    SLER Signal to Listener Echo Ratio
    SLIC Subscriber Line Integrated Circuit
    SLIM Simple Legislation for the Single Market
    SLP Service Location Protocol
    SLR Send Loudness Rating
    SM Service Management
    SM Single Mode
    SM Spectrum Management
    SMALLShort Multiplexed AAL
    SMATV Satellite Master Antenna Television
    SMC Spectrum Management Class
    SMD Short Message Delivery
    SMDB Short Message Delivery Broadcast
    SMDBACKShort Message Delivery Backward
    SMDFWDShort Message Delivery Forward
    SMDM Short Message Delivery Multipoint Bearer Service
    SMDPPShort Message Delivery Point-to-Point Bearer Service
    SMDS Switched Multi-megabit Data Service
    SME Short Message Entity
    SME Signaling Message Encryption
    SME Small-to-Medium sized Enterprises
    SME Subject Matter Expert
    SMEKEYShort Message Encryption Key
    SMG Special Mobile Group
    SMI Structure of Management Information
    SMM Spectrum Management Methodology
    SMMI Single Man Machine Interface
    SMPSimple Multiplexing Protocol
    SMPTE Society of Motion Picture and Television Engineers
    SMR Specialized Mobile Radio
    SMS Service Management System
    SMS Short Message Service
    SMSA Standard Metropolitan Statistical Area
    SM-SC Short Message Service Center
    SMSC Short Message Service Center
    SMSC SMS-call
    SMSREQShort Message Service Request
    S-MTAStandalone MTA
    SMTP Simple Mail Transfer Protocol
    SMV Selectable Mode Vocoder
    SN Scaling Number
    SN Service Node
    SNA Synchronous Network Architecture
    SNAP Sub Network Access Protocol
    SNDCP Sub Network Dependent Convergence Protocol
    SNHC Synthetic-Natural Hybrid Coding
    SNI Service Node Interface
    SNI SMS Notification Indicator
    SNI Standard Network Interface
    SNMP Simple Network Management Protocol (IETF)
    SNR-LP SNR scalable coding with Leaky Prediction
    SNR Signal to Noise Ratio
    SNRM Signal to Noise Ratio Margin (G.dmt.bis)
    SOA Semiconductor Optical Amplifier
    SOAP Simple Object Access Protocol (IETF)
    SOC System Operator Code
    SOHO Small Office Home Office
    SOI Start of Image
    SOM Self-Organizing Multicast
    SONET Synchronous Optical Network
    SOP Standard Operating Procedure
    SOS Speech Option Selection
    SOT Send Only Terminal
    SOVA Soft Output Viterbi Algorithm
    SP Service Provider
    SP Simple Profile
    SP Standards Proposal (TIA Industry Ballot)
    SP Study Point (ETSI)
    SP Switchable-P [frames]
    SPAService Provider Access
    SPACService Provider Action Council (DSL Forum)
    SPACHShort Message Service, Paging Channel and Access Response Channel
    SPAIService Provider Access Interfaces
    SPANServices and Protocols for Advanced Networks (ETSI TC)
    SPAR Service Provider Access Requirements (ETSI SPAN)
    S-PCN Satellite Personal Communications Network
    S-PDU Supervisory PDU
    SPH Service Profile at the Home location
    spi spots per inch
    SPI Standard Programmatic Interface
    SPIFF Still Picture Interchange File Format
    SPINA Subscriber Personal Identification Number Access
    SPINI Subscriber Personal Identification Number Intercept
    SPC Single Parity Check
    SPC System Programming Code
    SPIRITS Service in the PSTN/IN Requesting InTernet Service (IETF)
    SPL Sound Pressure Level
    SPNE Signal Processing Network Equipment
    SPnP Secure Plug and Play
    SpoA Service point of Access (TIPHON)
    S-PRBSSingle cycle - Pseudo Random Bit Sequence
    SPRT Simple Packet Relay Transport
    SPS Signaling Protocols and Switching
    SPS Signaling Protocol And System Technical Committee (ETSI)
    SPS5 SPCSignaling, Protocols and Switching Stored Program Controller (ETSI)
    SPTT Signal Processing Transmission Terminals
    SPV Service Profile at the Visited location
    S-PVC Soft-Permanent Virtual Circuit
    SPVC Switched Permanent Virtual Circuit
    SPWG Service Provider-focused Working Group (Trilateral)
    SQ Scalar Quantization
    SQCIF Sub-Quarter Common Intermediate Format
    SQEG Speech Quality Expert Group (ITU)
    SQL Structured Query Language
    S/R Suspend/Resume
    SR Special Report (Telcordia)
    SRA Seamless Rate Adaptation
    SRC Source
    SRC Strategic Review Committee (ETSI)
    SRD Standards Requirements Document
    SRDB Selective Routing Data Base
    SREJ Selective Reject
    SRF Service Resource Function
    sRGB Standard RGB (Red Green Blue)
    SRL Secure Radio Link
    SRL Software Release Letter
    SRL Structural Return Loss
    SRM Standards Related Matters
    SRP Scalable Resource reservation Protocol
    SRP Server Requester Protocol
    SRTP Secure Real-time Transport Protocol
    SRTS Synchronous Residual Time Stamp
    SRU Signal Regenerator Unit
    SRU-R Signal Regenerator Unit - Remote
    SS Slice Structured
    SS Steady State
    SS Supplementary Services
    SS#5 Signaling System 5
    SS#7, SS7 Signaling System 7
    SS-CD Supplementary Services Call Deflection
    SS-CFB Supplementary Services Call Forwarding Busy
    SS-CFNR Supplementary Services Call Forwarding No Reply
    SS-CFU Supplementary Services Call Forwarding Unconditional
    SS-CI Supplementary Service - Call Intrusion
    SSCOPService Specific Connecction Oriented Protocol
    SSCQE Single Stimulus Continuous Quality Evaluation
    SSCS Service Specific Convergence Sublayer
    SSD Shared Secret Data
    SSDSL Synchronized Symmetric Digital Subscriber Line
    SSE State Signaling Event
    SSE Sum of Squared Error
    SSF Service Switching Function
    SSFP Service Specific Face Plate
    SSGService Specification Group
    SSG Special Study Group (ITU)
    SSI Signal Strength Indicator
    SSL Secure Sockets Layer
    SS-MCMSupplementary Services - Message Center Monitoring
    SS-MID Supplementary Services - Mailbox Identification
    SSN Sub-System Number
    SSO Speech Service Option
    SSOVP Solid State Primary Protectors
    SSP Service Switching Point
    SSPR System Selection for Preferred Roaming
    SSRC Synchronization Source (IETF RFC 1889, RTP)
    ST Type of commercial fiber optic connector (Bayonet)
    STANAGNATO Standardization Agreement
    STAG Security Techniques Advisory Group
    STB Set Top Box
    STC Sub-Technical Committee (ETSI)
    STCXSingle Transcompression
    STD Simplified Trellis Decoder
    STDT Stutter Dial Tone
    STE Secure Terminal Equipment
    STF Specialist Task Force (ETSI)
    STG Special Task Group
    STG Special Topic Group
    STI Service Transport Interface
    STIT IEEE Subcommittee on Telephone Instrument Testing
    STL Software Tool Library
    STM Synchronous Transmission Mode
    STMR Sidetone Masking Rating
    STN Switched Telephone Network
    STP Set of Transmission Parameters (TM6)
    STP Shielded Twisted Pair
    STP Signaling Transfer Point
    STP Standards Technical Panel
    STQ Speech Transmission Quality (ETSI TC)
    STRE Side-Tone Reference Equipment
    STU Secure Terminal Unit
    STU SHDSL Transceiver Unit
    STU-C SHDSL Transceiver Unit - Central office end
    STU-R SHDSL Transceiver Unit - Remote Terminal End
    STU-III Secure Terminal Unit - III
    STS Short Term Stationary
    SU Subscriber Units
    SUB Sub-address (T.30)
    SUD Single Use Device
    SUR Survivability
    SVB Switched Video Broadcast
    SVC Switched Virtual Circuit
    SVD Simultaneous Voice Data
    SVF Simultaneous Voice and Facsimile
    SWSoftware
    SWELPSwitched Excited Linear Predictive
    SWG Sub-Working Group
    SWPStandardization Work Plan
    sYCCThe YCbCr style of sRGB color space under development as IEC 61966-2-1
    -T-
    T&E Technical & Engineering Committee (Telocator)
    T&ITesting & Interoperability (DSL Forum Working Group)
    T&IWGTesting & Interoperability Working Group (ADSL Forum)
    T&RTip and Ring
    TA Technical Assembly
    TA Terminal Adapter
    TA Transmit Additional information
    TAAB Technical Ad hoc Advisory Board
    TAAC Telecommunications Advisory Committee
    TAB Tone above Band
    TABD Trans-Atlantic Business Dialog
    TAC Terminal-Aggregator Communication
    TAC Terminal Attachment Council
    TACS Total Access Communications Systems
    TAF Terminal Adoption Function
    TAG Technical Advisory Group
    TAP Traditional Approval Process (ITU, via Resolution 1)
    TAP Two-step Approval Process (ETSI)
    TAPACTerminal Attachment Program Advisory Committee
    TAPI Telephony API
    TASA Telecommunications Access System Act
    TAWG Terminal Attachment Working Group
    TB Technical Body (ETSI)
    TB Turbo Block
    TBB Telecommunications Bonding Backbone
    TBCD Telephony Binary Coded Decimal
    TBD To be Determined
    TBG Technical Basis for Globalization
    TBH Technical Basis for Harmonized conformance
    TBI Ten Bit Interface
    TBR Technical Basis for Regulation (ETSI)
    TBRL Terminal balance return loss
    TC Technical Committee
    TC Telecommunications Closet
    TC Test Case
    TC Transaction Capabilities
    TC Transmission Convergence layer
    TCTrellis Coded
    TCTurbo Convolutional
    TCAM Telecommunication Conformity Assessment and Market Surveillance Committee (ETSI)
    TCAP Transaction Capabilities Application Part
    TC AT Technical Committee Access and Terminals (ETSI)
    TCB Telecommunications Certification Bodies
    TCBC Telecommunications Certification Bodies Council
    TCC Technical Correlating Committee (NEC)
    TCC Borland Turbo C++ Compiler
    TC-ERM ETSI Technical Committee on EMC and Radio spectrum Matters
    TCF Training Check (T.30)
    TCH Transparent Circuit Handling
    TC HF Technical Committee Human Factor (ETSI)
    TCIF Telecommunications Industry Forum (ATIS)
    TCL Transverse Conversion Loss
    TCLw Terminal Coupling Loss weighted
    TCM Time Compression Multiplex
    TCM Trellis Coded Modulation
    TCM-ISDNTime Compression Multiplexed ISDN
    TC-NA ETSI Technical Committee on Network Aspects
    TCOEF Transform Coefficient
    TCON Telenor Research's error concealment decoder
    T-CONT Traffic Container (G.983.dba)
    TCP Terminal Connection Point
    TCP Transmission Control Protocol
    TCPA Telephone Consumer Protection Act (1991)
    TC-PAMTrellis Coded Pulse Amplitude Modulation
    TCP/IPTransmission Control Protocol/Internet Protocol (IETF)
    TC SP Technical Committee Speech Processing
    TC-SPS ETSI Technical Committee on Signaling Protocol and System
    TC-TM Technical Committees on Transmission and Multiplexing
    TCR-TRTechnical Committee Report-Technical Report
    TCTL Tranverse Conversion Transfer Loss
    TCX Trans-Compression
    TD Temporary Document (ITU et al)
    TDD Task Data Descriptions (T.611 e-mail)
    TDD Telecommunications Devices for the Deaf
    TDD Time Division Duplexing
    TDF Transportable Document Format
    TDM Time Division Multiplex
    TDMA Time Division Multiple Access
    TDOA Time Difference of Arrival
    TDSO Test Data Service Option (cdma2000)
    TE Terminal Equipment (ETSI TC)
    TE Traffic Engineering
    TE2 Cellular User's Terminal Equipment
    TEC-LA Telecommunications and Electronic Consortium for Latin America
    TEDPA Telecommunications Equipment Distribution Program Association (www.tedpa.org)
    TEL Telephony (APEC WG)
    TELR Talker Echo Loudness Rating
    TEM TE Management Meeting
    TEM Transverse Electro Magnetic
    TEN Trans-European Networks
    TEN-Telecom Trans-European Telecommunications Networks
    TEP Talk Echo Protection
    TEQTime Domain Equalizer
    TES Telecommunication Equipment Safety
    TETRATrans European Trunked RAdio
    TFTask Force (IEEE)
    TFIG Task Force Implementation Group
    TFO Tandem Free Operation
    TFTP Trivial File Transfer Protocol (RFC 1350)
    TG Task Group
    TGB Telecommunications Grounding Busbar
    TGCP Trunking Gateway Control Protocol
    T-H Tomlinson-Harashima (precoding)
    THD Total Harmonic Distortion
    THL TransHybrid Loss
    THP Tomlinson-Harashima Precoding
    TI Traffic Information
    TIA Telecommunications Industry Association
    TICS Transport Information and Control Systems
    TIES Telecom Information Exchange Services (ITU)
    TIES Time Independent Escape Sequence
    TIFF Tagged Image File Format
    TIFF-F Tagged Image File Format-Fax
    TIFF-FX Tagged Image File Format-Fax (RFC 2301)
    TIGIN Transport Network Equipment for Interconnecting GSTN and IP Networks (ITU-T G.799.1)
    TILU Telecommunications Industry Liaison Unit (FBI)
    TIMS Transmission Impairment Measurement System
    TINA Telecommunications Information Networking Architecture
    TIP Transport and Internetworking Package
    TIPIA TIPHON IP telephony Implementation Agreement
    TIPHON Telecommunications and Internet Protocol Harmonization Over Networks (ETSI Project)
    TIWG Testing & Interoperability Working Group
    TLA Three Letter Acronym
    TLA Top-Level Aggregation (RFC2450)
    TLC Test Loop Combination
    TLD Third Level Domain
    TLDN Temporary Local Directory Number
    TLP Test Level Point
    TLV Type Length Value
    TM TeleManagement (Forum)
    TM Transmission and Multiplexing (ETSI TC)
    TMC Time-slot Management Channel
    TMCC TM Chairman's Coordination committee
    TMF TeleManagement Forum
    TMGB Telecommunications Main Grounding Busbar
    tML telecommunications Markup Language
    TML Test Model
    TMMTelecom-based Multimedia
    TMN Telecommunication Management Network
    TMN1 Temporal Reference Model for the Near Term 1
    TMN8 Video Codec Test Model, Near-Term, Version
    TMSI Temporary Mobile Station Identity
    TNR Transmit Not Ready
    TNS Transit Network Selection
    TNV Telephone Network Voltage (IEC 950)
    TOTechnical Organization
    TO Telecommunications Outlet
    TOA Time of Arrival
    ToC Table of Contents
    TOC Terminated Open Circuit
    TOLR Transmit Objective Loudness Rating
    TOMTelecom Operations Map (TeleManagement Forum)
    TON Type of Number
    ToR Terms of Reference
    TOR-G Technical Organization Reform Group
    ToS Type of Service (RFC1349)
    TOS Type Of Service octet in IPv4
    TOSCAText and Office Systems Content Architecture
    TOSQATelecommunication Objective Speech Quality Assessment, algorithm of T-Nova Berkom
    TP Test Protocol
    TP Test Purposes
    TPDU Transport Protocol Data Unit (X.224)
    TPS Transport Protocol Specific
    TPS-TC Transport Protocol Specific-Transmission Convergence
    TPKT Transport Packet (T.123)
    TPUI Temporary Portable User Identity
    T/R Tip/Ring
    TR Technical Report
    TR Technical Requirements (TIA committee)
    TR Telecommunications Room
    TR Temporal Reference
    TR Text Relay (QH/16)
    TR Transmit Ready
    TR2TF Technical (TR- Committee) Regulatory Reform Task Force
    TRAC Technical Recommendations Application Committee (ETSI)
    TRCTIPHON Resolution Capability
    TREGTelecommunications Regulatory Email Grapevine
    TRICTIA Regulatory Issues Committee
    TRIOTIPHON Remote InterOp
    TRIPTelephony Routing Information Protocol
    TRLTransmit Loudness Rating
    TRMMDSTechnical Requirements MultiMedia Distribution Systems
    TRP Temporal Reference for Prediction
    TRQ Technical Requirements document (T1)
    TRRTF Technical (TR- Committee) Regulatory Task Force
    TRWNTTechnical Requirements Wireline Terminals
    TRWSTTechnical Requirements Wireless Terminals
    TS Technical Specification
    TSTime Slot (Q6/15)
    TSTransport Stream
    TS PCRTransport Stream Program Clock Reference
    TSATransmitting Subscriber internet Address
    TSACCTelecommunication Standards Advisory Council of Canada
    TSAG Telecommunication Standardization Advisory Group (ITU)
    TSAP Transport layer Service Access Point
    TSAPI Telephony Server API
    TSB Telecommunications Standardization Board (ITU)
    TSB Telecommunications Systems Bulletin (TIA)
    TSCTechnical Standards Committee
    TSEG Test Signals Experts Group (ITU-T Q6/15, Q4/12, Q6/12)
    TSG Technical Specification Group
    TSITerminal Support Interface
    TSI Transmitting Subscriber Identification
    TSP Telephony Service Provider
    TSS ITU-Telecommunications Standardization Sector (CCITT)
    TSS Test Suite Specification
    TSSC Technical Standards Subcommittee (TIA)
    TSSS Temporal, SNR, and Spatial Scalability
    TSV Transport Area (IETF)
    TSWG Transport Sub Working Group (DSL Forum)
    TT ANSI Translation Type
    TTC Telecommunication Technology Committee (Japan)
    TTC TIA Technical Committee
    TTCM Turbo Trellis Coded Modulation
    TTCN Tree and Tabular Combined Notation
    TTE Telecommunications Terminal Equipment
    TTF Technical Task Force
    TTIB Transparent tone in band
    TTL Time To Live
    TTP Trusted Third Party
    TTT Trans-European Network Telecom (TIPHON)
    TTY Teletype
    TU-CTransceiver Unit - Central Office End
    TUPTelephony User Part
    TVTelevision
    TWATime Weighted Average
    TWAINScanner Interface API: Technology Without An Interesting Name (MFPI work)
    TWDMThin Wavelength Division Multiplexing
    TWIMTerrestrial Wireless Interactive Multimedia
    TWPTechnical Working Procedures (ETSI)
    TX Transmit
    -U-
    U/S Upstream
    UA User Agent
    UAP Unified Accelerated Procedure
    UART Universal Asynchronous Receiver Transmitter
    UAS Unavailable Seconds (Rec. G.997.1)
    UAWGUniversal ADSL Working Group
    UB Unlicensed Band
    UBC Uniform Building Code
    UBC University of British Columbia
    UBIC Unbilled Itemized Calls
    UBR Unspecified Bit Rate
    UBS User-Based Solution
    UC-PAM Ungerboeck Coded PAM
    UCAN User Circuit mode Access to Network (T1S1)
    UCF Unregistration Confirm
    UCI Universal Communications Identifier
    UCS Universal Character Set
    UCS Universal multiple octet coded Character Set
    UDDI Universal Description, Discovery and Integration (industry initiative)
    UDI Unrestricted Digital Information
    UDLC Universal Digital Loop Carrier
    UDP User Datagram Protocol (IETF)
    UEP Unequal Error Protection
    UDP User Datagram Protocol
    UDPTL Facsimile UDP Transport Layer protocol
    UGST User's Group on Software Tools
    UHF Ultra High Frequency
    UI Unit Interval
    UI User Interface
    UI Unnumbered Information (V.42)
    UIH Unnumbered Information with Header check
    UIM User Identity Module
    UL Underwriters Laboratories
    ULL Unbundled Local Loop
    ULM Unified Management Framework
    ULP Uneven Level Protection
    Um Radio (Air) Interface between Mobile and Base Station
    UME UNI Management Entity
    UML Unified Modeling Language
    UMTS Universal Mobile Telecommunications System
    UMV Unrestricted Motion Vector (H.263)
    U-N User-Network
    UNA User Network Aspects
    UNAA Universal Network Access Arrangement
    UN/ECEUnited Nations Economic Commission for Europe
    UNERMUnacknowledged Non-Error Recovery Mode
    UNHUniversity of New Hampshire
    UNI User-Network Interface
    UP User Part
    UPBOUpstream Power Back-Off
    UPC Usage Parameter Control
    U-PCS, UPCS Unlicensed PCS
    UPED User Premises Equipment Division
    uPnPUniversal Plug and Play Forum
    UPQoSUser Perceived QoS
    UPR Users Performance Requirements
    UPS Uninterrupted Power Supply
    UPT Universal Personal Telecommunications (ITU)
    UPTSP Universal Personal Telecommunications Service Providers
    UPU Universal Postal Union
    UQ Utility Quality
    URI Unified Resource Identifier
    URI User Premises Equipment Regulatory Issues
    URL Uniform Resource Locator
    URNUser Requirements Notation Focus Group
    URQ Unregistration Request
    US Under Study
    US1 TDMA Wireless Speech Coder
    USAG United States Advisory Group
    USB Universal Serial Bus
    USCEL United States Council of EMC Laboratories
    USH University of Sherbrooke
    USIM Universal Subscriber Identity Module (3GPP Working Group T3)
    USM User Security Model
    uSMS universal Short Message Service
    USNC United States National Committee
    USOC Uniform Service Order Codes
    USTA United States Telecom Association
    USTR US Trade Representative
    UT Upper Tester (TIPHON)
    UTAM Unlicensed Transition and Management
    UTC Universal Time Code
    UTF UCS (Universal Character Set) Transformation Format
    UTL Utility
    UTP Unshielded Twisted Pair
    UTRAN UMTS Radio Access Network
    UU, U-U User to User
    UUIUser-User Interface
    UUIE User-to-User Information Element
    UUT Unit Under Test
    UVG Universal Voice Grade
    UVLC Universal Variable Length Codeword
    UWCC Universal Wireless Communications Consortium
    UXP Unequal Erasure Protection
    -V-
    V&M Voice and Multimedia WG (ATM Forum)
    V&V Validate and Verify
    VA Viterbi Algorithm
    VAD Voice Activity Detector
    VADSLVery high speed ADSL
    VAF Voice Activity Factor
    VAME Voice on ATM Multiplication Equipment
    VAR Value Added Resellers
    VBD Voice Band Data
    VBIVertical Blanking Interval
    VBRnrtVariable Bit Rate non-real time
    VBRrtVariable Bit Rate real time
    VBSMC Variable Block-Size Motion Compensation
    VBST Variable Block Size Transform
    VBV Video Buffer Verification
    VC-RDI Virtual Circuit-Remote Detect Indicator
    VC Video Control
    VC Virtual Channel
    VC Virtual Circuit (Rec. I.610)
    VC Virtual Connection
    VC Virtual Container
    VC Volume Control
    VCC Virtual Channel Connection
    VCEG Video Coding Experts Group
    VCELS Vertical Cavity Surface Emitting Laser
    VCOM vcom.drv for Microsoft Chicago
    VCI Virtual Channel Identifier
    VCL Video Coding Layer
    VCR Video Cassette Recorder
    VCS Voice Controlled Services
    VCV Video Complexity Verifier
    VDC Volts DC
    VDI Verification and Demonstration Implementation
    VDI Verification, Design and Implementation
    VDMA German Telefax Association, Verband Deutscher Maschinen und Anlagenbau
    VDSL Very high speed DSL
    VDTI Voiceband Data Transmission Interface
    VEDVoice Enhancement Devices
    VEMMIVersatile MultiMedia Interface (ETSI)
    VEMMIVideotex Enhanced Man Machine Interface Service
    VERA Video Error Resilience Algorithm
    VESA Video Electronic Standard Association
    VHE Virtual Home Environment
    VHF Very High Frequency
    VHN Versatile Home Network
    VHN VESA's Home Networking
    V-I Voltage - Current
    VIA Vendors ISDN Association
    VICS Vehicle Information and Communications System Service (Japan)
    VIM Vendor Independent Messaging
    VIMP Virtual Interoperability Meeting Place
    VISIONng Voice over IP Service IntroductiON - new generation
    VLAN Virtual Local Area Network
    VLBR Very Low Bit Rate
    VLBVTVery Low Bit rate Video Telephony
    VLC Variable Length Coding
    VLCD Variable Length Coding and Decoding
    VLDVariable Length Decoding
    VLDB Very Large Database
    VLF Visitor Location Function
    VLR Visitor Location Register
    VLRINVisitor Location Register Identification Number
    VLSI Very Large Scale Integration
    VM Verification Model
    VMAC Voice Mobile Attenuation Code
    VMLA Virtual Mobile Location Area
    VMM Virtual Meeting Management
    VMOA Voice and Multimedia over ATM (ATM Forum WG)
    VMS IBM operating system
    VMS Voice Mail System
    VMWI VoiceMail Waiting Indication
    VoADSLVoice over ADSL
    VoATM Voice over ATM
    VoB Voice over Broadband
    VOC VDSL Operations Channel
    VOD Video on Demand
    VoDSL Voice over DSL
    VoI Voice over Internet
    VoIP Voice Over Internet Protocol
    VoMBNVoice over Multi-Service Broadband Networks
    VoMPLSVoice over MPLS
    VoMSDNVoice over Multi-Service Data Networks
    VONVoice on Network Coalition
    VON Voice On the Net
    V-ONT Video-Optical Network Terminal
    VOP Video Object Planes
    VOP Voice over Packet (Network)
    VoSTM Voice over Synchronous Transfer Mode
    VOX Voice Operated Transmission
    VP Virtual Packet
    VP Virtual Path (ATM Forum, Q2/15)
    VPF Virtual Private Facility
    VPI Virtual Path Identifier
    VPIM Voice Profile for Internet Mail
    VPM Voice Privacy Mask
    VPMASKVoice Privacy Mask
    VPN Virtual Private Network
    VQ Vector Quantization
    VQE Voice Quality Enhancement (ITU-T)
    VQEG Video Quality Experts Group
    VQM Video Quality Metric
    VQmon ETSI TS101 329-5 Annex E, Method for Determining an Equipment Impairment Factor using Passive Monitoring
    VR Vertical Resolution
    VSAT Very Small Aperture Terminal satellite services
    VSB Vestigial Side Band
    VSC Vertical Service Codes
    VSELP Vector Sum Excited Linear Predictive Coding
    VSOGVertical Service Ordering Guidelines
    VTOA Voice and Telephony Over ATM
    VTQMEVoice Transmission Quality Mouth to Ear (ETSI)
    VTR Video Tape Recorder
    VTS Voice Tone Support
    VTU VDSL Transceiver Unit
    VTU-C VDSL Transceiver Unit - Central
    VTU-O VDSL Transeiver Unit at the Optical network unit
    VTU-R VDSL Transceiver Unit - Remote Terminal
    V-UNI Virtual UNI
    VWC Vector Wavelet Coding
    -W-
    W3C World Wide Web Consortium
    WAC Wus AC engine (proposed) (JVT)
    WACS Wireless Access Communication Systems
    WAN Wide Area Network
    WAP Wireless Application Protocol
    WARC World Administrative Radio Conference
    WB Wide Band
    WBS Wireless Business System
    WCAT Wireless Cellular Action Team
    WCDMAWideband Code Division Multiple Access
    WCPE Wireless CPE
    WCSWireless Communications System
    WD Wireless communications Devices
    WD Working Document
    WDM Wavelength Division Multiplexing
    WDS Wireless Data Service
    WEB-CAM Web Camera
    WEPL Weighted Echo Path Loss
    WER Word Error Rate
    WFOM Wait for Overhead Message
    WFQ Weighted Fair Queuing
    WG Working Group
    WI Waveform Interpolation
    WI Work Item
    WIDE Widely Integrated Distributed Environment
    WIMS Wireless Multimedia and Messaging Services
    WIN Wireless Intelligent Network
    WINS BT's Wideband Impulsive Noise Survey
    WISWide area Interface Sublayer
    WLAN Wireless LAN
    WLL Wireless Access Local Loop
    WLNP Wireless Local Number Portability
    WMLWireless Markup Language (used in WAP)
    WMOPSWeighted MOPS
    WOSA Windows Open Services Architecture
    WOT World Ordering Team (TeleManagement Forum)
    WP Working Party (ITU)
    WPA Working Party A
    W-PBX Wireless PBX
    WPM Work Program (ETSI)
    WPT Wireless Personal Terminal
    WRC World Radiocommunication Conference
    WRE Wireless Residential Extension
    WSC World Standardization Conference
    WTWorking Text (DSL Forum)
    WTLR Wireless Terminal Location Registration
    WTPF World Telecommunication Policy Forum (ITU)
    WTSA World Telecommuncations Standardization Assembly (ITU)
    WTSC World Telecommunication Standardization Conference (ITU)
    WUPE Wireless User Premises Equipment (TR-41.6)
    WWW World Wide Web (Internet)
    -X-
    XAPI eXtensive Application Programming Interface
    XAPIAX.400 API Association
    xDSL All the different DSL technologies
    XER XML Encoding Rules
    xGCP Gateway Control Protocol including MGCP, SGCP and IPDC
    XID eXchange IDentification
    XIWT Cross-Industry Working Team
    XML eXtended Markup Language
    XNI Customer Network Interface
    xoIP FoIP, MoIP, VoIP
    XOR eXclusive OR
    XRS Message not understood
    xRUall the different Regenerator/Repeater Units
    XSD XML Schema Definition
    XTI X-open Transport Interface
    xTAAB Advisory Board on Other Access Technologies
    xTU-C All the different Transceiver Units - Central
    xTU-R All the different Transceiver Units - Remote
    -Y & Z-
    YCbCrColor space used in digital video
    YCC Color space used in digital video
    ZHP Z = input impedance of the ADSL transceiver; HP = high pass (ETSI RTS_TM-06006)
    ZLP Zero Loss Plan

    More Acronym Definitions:

  • A-D

  • E-H

  • I-M

  • N-R


    Acronym Definitions last updated July 2, 2002. We are no longer keeping it current.


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