Mobile Wireless Services


Telecom and Wireless
Industry Acronyms

A comprehensive dictionary of the many acronyms and abbreviations used throughout the telecoms and telephone industry.

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Telecom & Wireless Industry Acronyms

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1-ESS x-ESS series of "Electronic Switching Systems" from AT&T/Lucent
3G Third Generation (Mobile Network)
3GPP Third-Generation Partnership Project
3WC Three Way calling
4GL Fourth-Generation Language
800 or 888 Freephone
802.x Series of LAN standards developed by IEEE
911 Emergency telephone number in North America

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A

AAV Alternative Access Vendor
ABR Available Bit Rate
AC Access Control, or Alternating Current, or Authentication Center (also AUC)
ACD Automatic Call Distributor
ACE Authentication Encryption
ACEK Authentication Encryption Key
ACK Acknowledgement
ACP Access Control Point
ACRE Authorization and Call Routing Equipment
ADM Add-Drop Multiplexer (SDH Element)
ADPCM Adaptive Differential Pulse Code Modulation
ADSL Asymmetric Digital Subscriber Line
AGRAS Air-Ground Radiotelephone Automated Service
AIOD Automatic Identification of Outward Dialed calls
AIN Advanced Intelligent Network (ANSI IN Standard)
A-key Authentication key
ALI Automatic Location Information
AM Amplitude Modulation
AMPS Advanced Mobile Phone System
ANI Automatic Number Identification
ANS Advanced Network Services
ANSI American National Standards Institute
ANSI-41 ANSI standard for mobile management (ANSI/TIA/EIA-41)
ANT ADSL Network Terminator
AOA Angle of Arrival
AOL America On Line (ISP)
API Application Programming Interface
APPC Advanced Program-to Program Communications (IBM SNA)
APPN Advanced Peer-to-Peer Network (IBM SNA)
ARCnet Attached Resource Computer Network (Datapoint)
ARDIS Advanced Radio Data Information Service
ARP Address Resolution Protocol
ARPA Advanced Research Projects Agency
ARPU Average Revenue Per User
ARPANET ARPA Network
ARQ Automatic Repeat Request
ARS Automatic Route Selection
ASCII American Standard Code for Information Interchange
ASIC Application-Specific Integrated Circuit
ASN.1 Abstract Syntax Notation 1 (ISO)
ASP Application Service Provider
ASR Automatic Send Receive, Automatic Speech Recognition
AT&T American Telephone & Telegraph
ATIS Alliance for Telecommunications Industry Solutions (formerly ECSA)
ATM Asynchronous Transfer Mode, Automatic Teller Machine
ATSC Advanced Television Systems Committee
AUI Attachment Unit Interface
AWG American Wire Gauge
AXE 10 Series of electronic telephone exchanges from L.M. Ericsson

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B

B2B Business-to-Business
B2C Business-to-Consumer
B8ZS Binary Eight Zero Substitution
BACP Bandwidth Allocation Control Protocol
BBS Bulletin Board System
Bellcore Bell Communications Research, Inc. (Now Telcordia)
BEP Back-End Processor
BER Bit Error Rate
BERT Bit Error Rate Test (or Tester)
BIOS Basic Input-Output System
B-ISDN Broadband ISDN
BOC Bell Operating Company (USA)
BONDING Bandwidth On Demand Interoperability Group
bps bits per second
BRI Basic Rate Interface (ISDN)
BS Base Station
BSC Base Station Controller, or Binary Synchronous Communications (IBM)
BSS Base Station Sub-system (GSM)
BSS Business Support Systems
BTS Base Transceiver Station

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C

CAD Computer-Aided Design
CAM Computer-Aided Manufacturing
CAMEL Customized Applications for Mobile-network Enhanced Logic (GSM/ETSI)
CAN Campus Area Network
CANARIE Canadian Network for Advancement of Research, Industry, Education
CAP Competitive Access Provider
CAPS Common ISDN API Service
CARS Cable Antenna Relay Services
CASE Computer-Aided Software Engineering
CATV Cable Television or Community Antenna Television
CAVE Cellular Authentication and Voice Encryption
CB Citizens Band
CBR Constant Bit Rate
CCC Clear Channel Capability
CCCH Common Control Channel
CCD Charge Coupled Device
CCIR Comité Consultatif International des Radiocommunications (now ITU-R)
CCITT Comité Consultatif International des Télégraphes et Téléphones (now ITU-T)
CCR Customer Controlled Reconfiguration
CCS Common Channel Signaling
CCSS6 Common Channel Signaling System # 6
CD-R Compact Disk-Recordable
CD-ROM Compact Disk-Read-Only Memory
CDMA Code Division Multiple Access
CDO Community Dial Office
CDPD Cellular Digital Packet Data
CDR Call Detail Record
CENTREX Central Office Exchange (PBX-like Service)
CEPT Conference of European Posts and Telecommunications
CERN Centre Européen de Recherche Nucléaire
CGSA Cellular Geographic Service Areas
CIR Committed Information Rate
CLASS Custom Local Area Signaling Services
CLEC Competitive Local Exchange Carrier
CLI Calling Line Identification
CMA Communications Management Association
CMIP Common Management Information Protocol (ISO)
CMIS Common Management Information Services (ISO)
CMISE Common Management Information Service Element (ISO)
CMOS Complementary Metal Oxide Semiconductors
CMRS Commercial Mobile Radio Service
CNET Centre National d'Études en Télécommunications (France Telecom)
CNI Calling Number Identification
CO Central Office
Codec Coder/decoder
CON Concentrator
COO Cell of Origin
CORBA Common Object Request Broker Architecture (OMG)
COT Central Office Terminal
cPCI Compact Peripheral Component Interconnect
CPE Customer Premises Equipment
CPN Cisco Powered Network (Ingredient Band)
CPP Calling Party Pay
CPS Cycles per second (Hertz)
CPU Central Processing Unit
CRC Cyclic Redundancy Check
CRM Customer Relationship Management
CSA Carrier Servicing Area
CSM Communications Services Management
CSMA/CD Carrier Sense Multiple Access with Collision Detection
CSR

Customer Service Representative

CSU Channel Service Unit
CT Cordless Telecommunications
CTI Computer Telephony Integration
CTIA Cellular Telecommunications Industry Association
Cu Copper Local Loop
CUG Closed User Groups

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D

D-AMPS Digital Advanced Mobile Phone Service
DA Destination Address
DAP Demand Access Protocol
DARPA Defense Advanced Research Projects Agency
DAT Digital Audio Tape
dB deciBel
DBMS Database Management System
DBS Direct Broadcast Satellite
DCE Data Communications Equipment, or Distributed Computing Environment
DCU Distribution and Control Unit
DDD Direct Distance Dialing
DDS Dataphone Digital Service
DECT Digital Enhanced (formerly, European) Cordless Telecommunication
DES Data Encryption Standard
DLCS Digital Loop Carrier System
DLL Dynamic Link Library
DLU Digital Line Unit
DM Distributed Management
DME Distributed Management Environment (OSF)
DMI Distributed Management Interface
DMS Digital Multiplex Switch (Nortel Networks Switching Product Family DMS 100, 200, …)
DMT Discrete Multitone
DMTF Desktop Management Task Force
DNA Digital Network Architecture (Digital Equipment Corporation)
DNS Domain Name Service DoD Department of Defense (USA)
DOS Disk Operating System
DOV Data Over Voice
DPCM Differential Pulse Code Modulator
DS Digital Service, Digital Signal
DS-0 Digital Signal, Level 0 (64 kbps)
DS-1 Digital Signal, Level 1 (1.544 Mbps)
DS-1C Digital Signal, Level 1C (3.152 Mbps)
DS-2 Digital Signal, Level 2 (6.312 Mbps)
DS-3 Digital Signal, Level 3 (44.736 Mbps)
DS-4 Digital Signal, Level 4 (274.176 Mbps)
DSI Digital Speech Interpolation
DSL Digital Subscriber Line
DSP Digital Signal Processor
DSS Decision Support System
DSU Digital Service Unit
DTAM Document Transfer and Manipulation (ISO)
DTE Data Terminal Equipment
DTMF Dual-Tone MultiFrequency
DTU Data Transfer Unit
DTV Digital Television
DVB Digital Video Broadcasting
DWDM Dense Wavelength Division Multiplexing
DXI Data Exchange Interface

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E

E2E End-to-End
E-911 Enhanced emergency telephone number (USA)
E&M Ear and Mouth, or recEive and transMit (signaling)
E-TDMA Expanded Time Division Multiple Access
EAI Enterprise Application Integration
EBCDIC Extended Binary Coded Decimal Interchange Code (IBM)
EC European Community
ECMA European Community Manufacturers Association
ECSA Exchange Carrier Standards Association (now ATIS)
EDGE Enhanced Data for GSM Evolution
EDI Electronic Data Interchange
EEROM Electronically Erasable Read-Only Memory
EF&I Engineering, Furnishing and Installation
EFT Electronic Funds Transfer
EHF Extremely High Frequency (more than 30 GHz)
EIA Electronic Industries Association
EIR Equipment Identity Register
EISA Extended Industry Standard Architecture
EMEA Europe, Middle East & Africa (Business Region)
EML/EMS Element Management Layer/ Element Management Service
EMS Enhanced Messaging Services
ENS Enhanced Network Services
EOT End of Transmission
EPI External Provisioning Interface
ERMES European Radio Message System (standard for pagers)
ERP Enterprise Resource Management
ESCON Enterprise System Connection (IBM)
ESMR Enhanced Specialized Mobile Radio
ETSI European Telecommunications Standard Institute
EU European Union

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F

FASB Financial Accounting Standards Board (USA)
FAT File Allocation Table
FC Frame Control, or Fiber Channel
FCAPS

Fault, Configuration, Accounts, Performance, Security (ISO)

FCC Federal Communications Commission (USA)
FCS Frame Check Sequence
FDD Frequency Division Duplex
FDDI Fiber Distributed Data Interface
FDIC Federal Deposit Insurance Corporation (USA)
FDMMA Frequency Division Multiplexing Multiple Access
FEP Front-End Processor
FHSS Frequency Hopping Spread Spectrum
FIFO First-In First-Out
FITL Fiber In The Loop
FM Frequency Modulation
FMS Fraud Management System
FO Fiber Optic
FOD Fax on Demand
FR Frame Relay
FRAD Frame Relay Access Device, or Assembler/ Disassembler
FRS Family Radio Service
FSK Frequency-Shift Keying
FSS Fixed Satellite System
FTAM File Transfer, Access, and Manipulation (ISO)
FT1 Fractional T1
FTP File Transfer Protocol (TCP/IP)
FTS Federal Telecommunications System
FTTB Fiber To The Building
FTTC Fiber To The Curb
FTTK Fibre To The Kerb
FTTH Fiber To The Home
FWA Fixed Wireless Access

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G

GAN Global Area Network
GATT General Agreement on Tariffs and Trade
Gb gigabit
GB gigabyte
GDS Generic Digital Services
GEO Geostationary-Earth-Orbit
GHz gigaHertz (billions of cycles per second)
GIS Geographic Information System
GMRS General Mobile Radio Service
GOSIP Government Open Systems Interconnection Profile (USA)
GPRS General Packet Radio Service
GPS Global Positioning System
GRX GPRS Roaming Exchange
GSA General Services Administration (USA)
GSM Global System for Mobile telecommunications, or Groupe Spécial Mobile
GUI Graphical User Interface
GVPN Global Virtual Private Network

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H

H0 High-capacity ISDN channel operating at 384 kbps
H11 High-capacity ISDN channel operating at 1.536 Mbps
H323 ANSI standard for format over IP
HDLC High-level Data Link Control (ISO)
HDSL High-bit-rate Digital Subscriber Line
HDTV High-Definition Television
HF High Frequency (3 MHz to 30 MHz)
HFC Hybrid Fiber/Coax
HIC Head-end Interface Converter
HLR Home Location Register
HomePNA Home Phoneline Networking Alliance
HPPI High-Performance Parallel Interface

HTML

HyperText Markup Language
HTTP HyperText Transfer Protocol
HVAC Heating, Ventilation, and Air Conditioning
Hz Hertz (cycles per second)

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I

I/O Input/Output
IA5 International Alpha Set No. 5
IAB Internet Architecture Board
IAC Install And Commission
IANA Internet Assigned Numbers Authority
ICANN Internet Corporation for Assigned Names and Numbers
ICI Interexchange Carrier Interface
ICMP Internet Control Message Protocol
ICR Intelligent Call Routing
ICS Intelligent Calling System ID Identification
IDDD International Direct Dialing Designator
iDEN integrated Dispatch Enhanced Network
IDPR Interdomain Policy Routing
IEC International Electrotechnical Commission, or InterExchange Carrier
IEEE Institute of Electrical and Electronics Engineers
IESG Internet Engineering Steering Group
IETF Internet Engineering Task Force
ILEC Incumbent Local Exchange Carrier
IM Instant Messaging
IMAP Internet Mail Access Protocol (IETF)
IMEI International Mobile Equipment Identity
IMN Intelligent Mobile Network
IMT-2000 International Mobile Telecommunications 2000 (ITU)
IMSI International Mobile Subscriber Identity
IN Intelligent Network
IN7 Compaq SS7 stack (previously DECss7)
INAP Intelligent Network Application Part (IN)
INMS Integrated Network Management System
INTELSAT International Telecommunications Satellite Organization
I/O Input/Output
IOC InterOffice Channel
IOPS Internet Operators' Providers Services
IP Intelectual Property
IP Intelligent Peripheral (IN)
IP Internet Protocol (IETF)
IPN Intelligent Peripheral Node
IPO Initial Public Offering
IPoATM Internet Protocol over ATM
IPR Intellectual Property Rights
IPX Internetwork Packet Exchange
IrDA Infrared Data Association
IrLAN Infrared LAN
IrLAP Infrared Link Access Protocol
IRC International Record Carrier
IRR Internal Rate of Return (Financial Modelling)
IRQ Interrupt Request
IRTF Internet Research Task Force
IS Information System, or Interim Standard (TIA/EIA)
IS-41 TIA/EIA Interim Standard for mobile management
ISA Industry Standard Architecture
ISC International Switching Center
ISDN Integrated Services Digital Network
ISM Industrial, Scientific, and Medical (frequency bands)
ISO International Standards Organization
ISOC Internet Society
ISP Internet Service Provider
ISUP ISDN Service User Part
IT Information Technology
ITR Intelligent Text Retrieval
ITT International Telegraph and Telephone
ITT Invitation To Tender
ITU International Telecommunication Union
ITU-R

International Telecommunication Union-Radiocommunications

ITU-T International Telecommunication Union-Telecommunications
IVR Interactive Voice Response
IXC IntereXchange Carrier (also IEC)

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J

JDC Japan Digital Cellular
JIT Just In Time
JPEG Joint Photographic Experts Group

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K

KB Kilobyte: One thousand and twenty-four bytes kbps kilo bit per second
KSR Key Send Receive
KSU Key Service Unit
KTS Key Telephone System
kHz kiloHertz (thousands of cycles per second)

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L

LAN Local Area Network
LAP Link Access Protocol (or Procedure)
LAP-B Link Access Protocol-Balanced
LAP-D Link Access Procedure- Digital channel (ISDN)
LAT Local Area Transport (Digital Equipment Corporation)
LATA Local Access and Transport Area (USA)
LBA Location Based Advertising
LBS Location Based Services
LCD Liquid Crystal Display
LCN Local Channel Number
LCR Least Cost Routing
LD Laser Diode
LD Long Distance
LDC Long Distance Carrier
LEC Local Exchange Carrier
LED Light-Emitting Diode
LEO Low-Earth-Orbit
LF Low Frequency (30 kHz to 300 kHz)
LLC Logical Link Control
LMDS Local Multipoint Distribution Services
LMS Location and Monitoring Service
LRC Longitudinal Redundancy Check
LSI Large-Scale Integration
LU Logical Unit (IBM)

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M

MB megabyte
MAC Media Access Control, or Move, Add, and Change
MAN Metropolitan Area Network
MAP Manufacturers Application Protocol (ISO, General Motors), or Mobile Applications Port
MAPI Messaging Applications Programming Interface (Microsoft)
MAPS Maps Application Provisioning System
MAU Multistation Access Unit
MC Management Center or Message Center
MCA Micro Channel Architecture (IBM)
MCU Multipoint Control Unit
MD Mediation Device
MDF Main Distribution Frame
MDN Mobile Directory Number
MEO Middle-Earth-Orbit
MES Master Earth Station
MF Mediation Function, or Medium Frequency (300 kHz to 3 MHz)
MHS Message Handling Source MHz megahertz (millions of cycles per second)
MIB Management Information Base
MIC Management Integration Consortium
MILNET Military Network (USA)
MIME Multipurpose Internet Mail Extensions
MIN Mobile Identification Number
MIPS Millions of Instructions Per Second
MIS Management Information Services, or Marketing Intelligence System
MLS Mobile Location Services
MMDS Multichannel, Multipoint Distribution Service
MMS Multimedia Message Service
MO Magneto-Optical Modem Modulator/demodulator
MOU Minutes of Use, or Memorandum of Understanding
MPEG Motion Picture Experts Group
MPLS Multi Protocol Label Switching (IETF)
MPPP Multilink Point-to-Point Protocol
MRI Magnetic Resonance Imaging
ms millisecond (thousandth of a second)
MS Mobile Station
MSC Mobile Switching Center
MSN Microsoft Network
MSRN Mobile Station Roaming Number
MSS Mobile Satellite Service
MTBF Mean Time Between Failure
MTP Message Transfer Part (IN)
MTS Message Telecommunications Service
MTSO Mobile Telephone Switching Office
MTTR Mean Time To Repair
MTU Maximum Transmission Unit
MVDS Microwave Video Distribution System
MVPRP Multivendor Problem Resolution Process

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N

N-AMPS Narrowband Advanced Mobile Phone Service
NAFTA North American Free Trade Agreement
NAK Negative Acknowledgement
NAM Numeric Assignment Module
NAP Network Access Point
NAS Network Attached Storage
NATA North American Telecommunications Allocation
NAU Network Addressable Unit (IBM)
NBS National Bureau of Standards
NC Network Computer
NCC Network Control Center
NCP Network Control Program (IBM SNA), or Network Control Point
NE Network Element
NEF Network Element Function
NEBS New Equipment Building Specifications
NECA National Exchange Carrier Association
NetBIOS Network Basic Input-Output System (Microsoft)
NFS Network File System (or Server)
NIC Network Interface Card, or Network Information Center (Internet Registry)
NiCad Nickel Cadmium
NiMH Nickel-Metal Hydride
NIST National Institute of Standards and Technology
NIU Network Interface Unit
NLM NetWare Loadable Module (Novell)
nm nanometer
NM Network Manager
NMC Network Management Center
NMC Nortel Matra Cellular
NMF Network Management Forum (now TMF)
NML/NMS Network Management Layer/Network Management Service
NMS NetWare Management System (Novell)
NNM Network Node Manager (Hewlett-Packard)
NOC Network Operations Center
NOS Network Operating System
NPI New Product Introduction
NREN National Research and Education Network (USA)
NRZ Non-Return to Zero
NSA National Security Agency
NSF National Science Foundation (USA)
NSK Non-Stop Kernel (Compaq)
NSS Network Switching Sub-system (GSM)
NSSG Network Solutions and Service Group (Nortel)
NT Network Termination, or New Technology, also Windows NT (Microsoft)
NTE Network Terminating Equipment
NTSA Networking Technical Support Alliance
NTSC National Television Standards Committee
NTU

Network Termination Unit

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O

OA&M Operations, Administration and Maintenance
OAM&P Operations, Administration, Maintenance and Provisioning
OC Optical Carrier
OC-1 Optical Carrier Signal, Level 1 (51.84 Mbps)
OC-3 Optical Carrier Signal, Level 3 (155.52 Mbps)
OC-9 Optical Carrier Signal, Level 9 (466.56 Mbps)
OC-12 Optical Carrier Signal, Level 12 (622.08 Mbps)
OC-18 Optical Carrier Signal, Level 18 (933.12 Mbps)
OC-24 Optical Carrier Signal, Level 24 (1.244 Gbps)
OC-36 Optical Carrier Signal, Level 36 (1.866 Gbps)
OC-48 Optical Carrier Signal, Level 48 (2.488 Gbps)
OC-96 Optical Carrier Signal, Level 96 (4.976 Gbps)
OC-192 Optical Carrier Signal, Level 192 (9.952 Gbps)
OC-256 Optical Carrier Signal, Level 256 (13.271 Gbps)
OCR Optical Character Recognition
ODBC Open Database Connectivity (Microsoft)
ODS Operational Data Store
OEM Original Equipment Manufacturer
OLAP Online Analytical Processing
OLE Object Linking and Embedding (Microsoft)
OMA Object Management Architecture
OMA Open Mobile Alliance
OMC Operations and Maintenance Centre (GSM)
OMF Object Management Framework
OMG Object Management Group
OOP Object-Oriented Programming
ORB Object Request Broker
OS Operating System
OS/2 Operating System/2 (IBM)
OSF Open Software Foundation
OSI Open Systems Interconnection (ISO), or Objective Systems Integrator
OSP OutSide Plant

OSPF

Open Shortest Path First
OSS Operations Support Systems
OTA Over The Air Activation
OTD Open Terminal Directive (European Union)

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P

P2P Person-to-Person
PABX Private Automatic Branch eXchange
PACS Personal Access Communications System
PAD Packet Assembler-Disassemble
PAL Phase Alternating by Line
PAM Pulse Amplitude Modulation
PAN Personal Area Network
PAP Password Authentication Protocol
PBX Private Branch eXchange
PC Personal Computer
PCB

Printed Circuit Board

PCI Peripheral Component Interconnect
PCIA Personal Communications Industry Association
PCM Pulse Code Modulation
PCMCIA Personal Computer Memory Card Industry Association
PCN Personal Communications Networks
PCS Personal Communications Services
PDA Personal Digital Assistant
PDC Personal Digital Cellular (Japan)
PDE Positioning Determination Entity
PDH Plesiochronous Digital Hierarchy
PDN Packet Data Network or Public Data Network
PDU Protocol Data Unit
PM Phase Modulation
PHY Physical Layer
PIM Personal Information Manager
PIN Personal Identification Number, or Positive-Intrinsic-Negative
PLMN Public Land Mobile Network
PMD Physical Media-Dependent
PnP Plug-and-Play
POP Point Of Presence
PoS Point Of Sale
POTS Plain Old Telephone Service
PPC Pay-Per-Call
PPP Point-to-Point Protocol
PPV Pay-Per-View
PRCS Philips Radio Communications Systems
PRI Primary Rate Interface (ISDN)
PROM Programmable Read-Only Memory
PSN Packet-Switched Network
PSTN Public Switched Telephone Network
PSK Phase Shift Keying
PT Payload Type
PTT Post, Telegraph and Telecommunications (Government Departments)
PU Physical Unit (IBM SNA)
PUC Public Utility Commission (USA)
PVC Permanent Virtual Circuit
PVN Private Virtual Network
   

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Q

Q3 Network Management Interface (ITU-T)
QA Quality Assurance
QEDI Quod Erat Demonstrandum
QoS Quality of Service

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R

RACE Research for Advanced Communications in Europe
RAID Redundant Array of Inexpensive Disks
RAM Random Access Memory
RBES Rule-Based Expert Systems
RBOC Regional Bell Operating Company (USA)
RCU Remote Control Unit
RDBMS Relational Database Management System
RDSS Radio Determination Satellite Service
RF Radio Frequency
RFC Request For Comment (IETF)
RFI Radio Frequency Interference, or Request For Information
RFP Request For Proposal
RFQ Request for Quotation
RIP Routing Information Protocol
RISC Reduced Instruction Set Computing
RJE Remote Job Entry
RMON Remote Monitoring
ROI Return On Investment
ROM Read-Only Memory
RPC Remote Procedure Call
RSI Repetative Strain Injury
RSVP Resource ReSerVation Protocol (IETF)
RT Remote Terminal
RTU Right To Use
RX Receive

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S

SA Source Address
SAA Systems Application Architecture (IBM)
SAN Storage Area Network or System Area Network (Himalaya)
SC Standards Committee (ISO)
SCCP Signaling Connection Control Point (IN)
SCE Service Creation Environment (IN)
SCP Service Control Point (IBM-SNA)
SCSI Small Computer Systems Interface
SDH Synchronous Digital Hierarchy
SDLC Synchronous Data Link Control (IBM)
SDN Software-Defined Network (AT&T)
SDSL Symmetrical Digital Subscriber Line
SHF Super High Frequency (3 GHz to 30 GHz)
S-HTTP Service Hypertext Transport Protocol
SIM Subscriber Identification Module
SIP Session Initiation Protocol (IETF)
SKU Stock-Keeping Unit
SLIC Subscriber Loop Interface Circuit
SLIP Serial Line Internet Protocol (IETF)
SMDS Switched Multimegabit Data Services
SML/SMS Service Management Layer/Service Management Service
SMR Specialized Mobile Radio
SMS Service Management System
SMS Short Message Service
SMSC Short Message Service Center
SMT Station Management
SMTP Simple Mail Transfer Protocol (IETF)
SN Switching Network or Station Number
SNA Systems Network Architecture (IBM)
SNI Subscriber Network Interface
SNMP Simple Network Management Protocol
SONET Synchronous Optical Network (ANSI)
SP Service Provider
SPA Software Publishers Association
SPX Sequenced Packet Exchange (Novell)
SQL Structured Query Language
SS Switching System
SS#7 Signaling System # 7 (ITU-T)
SS7 Signaling System 7 (ANSI)
SSCP System Services Control Point (IBM)
SSL Secure Sockets Layer (IETF)
SSP Service Switching Point (IN)
STDM Statistical Time Division Multiplexing
STM Synchronous Transfer Mode
STP Shielded Twisted-Pair, or Signal Transfer Point (IN)

STX

Start of Transmission
SUBT Subscriber Terminal
SVC Switched Virtual Circuit
S x S Step-by-Step
SYNTRAN Synchronous Transmission

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T

T-Carrier Trunk Carrier
T1 Transmission service at the DS1 rate of 1.544 Mbps
T2R Trusted Transaction Roaming
T3 Transmission service at the DS3 rate of 44.736 Mbps
TAG Technical Advisory Group
TAPI

Telephony Application Programming Interface (Microsoft)

TB terabyte (trillion bytes)
Tbps terabit per second
TCAP Transaction Capabilities Application Part (IN)
TCP Transmission Control Protocol (IETF)
TCP/IP Transmission Control Protocol /Internet Protocol (IETF)
TDD Time Division Duplexing
TDM Time Division Multiplexer
TDMA Time Division Multiple Access
TDOA Time Difference of Arrival
TeMIP Telecommunications Management Information Platform (Compaq)
TETRA Trans-European Trunked Radio Access (ETSI)
TIA Telecommunications Industry Association
TINA Telecommunications Information Networking Architecture
TL1 Transaction Language 1
TLS Transport Layer Security (IETF)
TMF Telecommunications Management Forum
TMN Telecommunications Management Network
TO Tandem Office or Toll Office
TO Telecommunications Operator
TOA Time of Arrival
TQM Total Quality Management
TRS Telecommunications Relay Services
TSAPI Telephony Services Application Programming Interface (Novell)
TSI Time Slot Interchange
TTY TeleType
TV Television
TWX Teletypewriter Exchange (also known as telex)
TX Transmit

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U

UART Universal Asynchronous Receiver/Transmitter
UBR Unspecified Bit Rate
UBC Utility Based Computing
UDP User Datagram Protocol (IETF)
UHF Ultra High Frequency (300MHz to 3 GHz)
UMS Universal Messaging System
UMTS Universal Mobile Telecommunications System (ETSI)
UN United Nations
UNI User-Network Interface
UPS Uninterruptible Power Supply
URL Universal Resource Locator (WWW)
USF Universal Server Farm (IBM)
UTP Unshielded Twisted - Pair
UTRA Universal Terrestrial Radio Access

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V

VAN Value-Added Network
VAR Value-Added Reseller
VBR Variable Bit Rate
VC Virtual Circuit
VCR Videocassette Recorder
VDSL Very high-speed Digital Subscriber Line
VF Voice Frequency
VG Voice Grade
VHF Very High Frequency (30 MHz to 300 MHz)
VLF Very Low Frequency (less than 30 kHz)
VLR Visitor Location Register
VLSI Very Large-Scale Integration
VM Virtual Machine (IBM)
VMS Virtual Machine System (Digital Equipment Corporation)
VOD Video On Demand
VoIP Voice over IP
VPN Virtual Private Network
VRC Virtual Redundancy Check
VSAT Very Small-Aperture Terminal
VT Virtual Terminal
VTAM Virtual Telecommunications Access Method (IBM SNA)

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W

W3C World Wide Web Consortium (also WWW3)
WACS Wireless Access Communications System
WAE Wireless Application Environment
WAN Wide Area Network
WAP Wireless Application Protocol
WATS Wide Area Telecommunications Service
W-CDMA Wideband - Code Division Multiple Access
WCS Wireless Communications Service
WDM Wavelength Division Multiplexing
WDP Wireless Datagram Protocol
WG Working Group
WGS Worldwide Geodesic System
WYSIWYG What You See Is What You Get
WLAN Wireless Local Area Network
WLL Wireless Local Loop
WLS Wireless Location Services (SignalSoft)
WML Wireless Markup Language
WNT Windows NT (Microsoft)
WORM Write Once Read Many
WS Workstation
WSF Workstation Function
WSP Wireless Session Protocol
WTA Wireless Telephony Application
WTLS Wireless Transport Layer Security
WTO World Trade Organization
WTP Wireless Transaction Protocol
WWAN Wireless Wide Area Network
WWW World Wide Web
WWW3 World Wide Web Consortium (also W3C)

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

X

X25 A Packet Switching Protocol
X-Bar Crossbar telephone exchange
XC Cross-Connect
xDSL "generic" Digital Subscriber Line
XML Extensible Markup Language
XNS Xerox Network System (Xerox Corporation)

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Y

Y2K Year 2000

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Z

ZIP Zone Improvement Program (geographic codes/ USA)
ZLE Zero Latency Enterprise (Compaq)

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