2B1Q Two binary, one quaternary
3G Third-generation technologies
10BaseT 10 MHz Ethernet based on Twisted Pairs
AAL ATM Adaptation Layer
ABR Available Bit Rate
ACD Automatic Call Distribution
ADM Add/Drop Multiplexer
ADSL Asymmetric Digital Subscriber Line
AE Application Entity
AF Assured Forwarding
AN Access Network
ANSI American National Standardization Institute

AP Application Process
API Application Programming Interface
APON ATM over PON

ARP Address Resolution Protocol
ASE Application Service Element
ASICs Application Specific Integrated Circuits
ASP Application Service Provider
ATM Asynchronous Transfer Mode

AuC Authentication Center

BCC Billing and Customer Care
BER Bit Error Rate

B-ISDN Broadband Integrated Services Digital Network
BMAN Broadband MAN

BRI Basic Rate Interface
BS Base Station
BSC Base Station Controller
BTS Base Transceiver Station

CAC Call Admission Control
CAMEL Customized Applications for Mobile Enhanced Logic
CAN Campus Area Network
CAP CAMEL Application Part

CAP Carrierless Amplitude/Phase (Modulation)
CATV Cable TV

CBR Constant Bit Rate

CELP Code-Exited Linear Prediction

CDMA Code Division Multiple Access
CIF Common Interchange Format

CES Circuit Emulation Service

CIR Committed Information Rate
CISC Complex Instruction Set Computer
CLEC Competitive Local Exchange Carrier
CN Core Network

CO Central Office
CoC Communication Control
CORBA Common Object Request Broker Architecture
CoS Class of Service
CPE Customer Premises Equipment
CPN Customer Premises Network
CRM Customer Relationship Management
CS Capability Set
CSTA Computer-supported Telephony Application Protocol

CTI Computer Telephony Integration
CTS Cordless Telephony System

DAVIC Digital Audio/Visual Interface Council
DBS Direct Broadcast Satellite
DCT Discrete Cosine Transformation
DiffServ Differentiated Services
DECT Digital Enhanced Cordless Telecommunications
DHCP Dynamic Host Configuration Protocol
DICE Delivery of Information in Cellular Environment
DMT Discrete Multitone [Modulation]
DNS Domain Name Server
DPE Digital Processing Environment
DRAM Dynamic RAM

DSL Digital Subscriber Line
DSLAM DSL Access Multiplexer

DSS Digital Subscriber Signaling System

DTV Digital Television

DVB Digital Video Broadcasting
DVD Digital Video Disk
DWDM Dense Wave-Division Multiplexing

DXS Digital Cross-Connect System

E1 PCM multiplex signal at 2048 kbit/s (European standard)
ECMA European Computer Manufacturing Association
ECTF Enterprise Computer Telephony Forum
EDGE Enhanced Data Rates for GSM Evolution
EF Expedited Forwarding
ESP External Service Point
ETSI European Telecommunications Standards Institute
ExE Service Execution Environment

F&F Friends and Family
FDDI Fiber Distributed Data Interface
FMC Fixed Mobile Convergence
FR Frame Relay
FRAD FR Access Device
FT Fixed Terminal

FTTB Fiber-to-the-Building
FTTC Fiber-to-the-Curb
FTTH Fiber-to-the-Home
FTTO Fiber-to-the-Office

GPRS General Packet Radio System
GSM Global System of Mobile Communication

GUI Graphical User Interface
GMPCS General Mobile Personal Communications System

HDLC High-Level Data Link Control
HDSL High Bit Rate DSL

HDTV High-definition Television

HFC Hybrid Fixed/Coax
HLR Home Location Register

HSCSD High Speed Circuit Switched Data

HTML HyperText Markup Language

HTTP HyperText Transfer Protocol

IAB Internet Activities Board
IBS Internet Broadcasting Service

ICMP Internet Control Message Protocol
IDSL ISDN-like DSL

IETF Internet Engineering Task Force

I/f Interface
IGMP Internet Group Management Protocol

ILEC Incumbent Local Exchange Carrier

IGMP Internet Group Multicast Protocol

IMT-2000 International Mobile Telecommunications-2000

IN Intelligent Network
INAP IN Application Part

IntServ Integrated Services
IP Internet Protocol
IPng New Generation IP
IPoATM IP over ATM
IPoFR IP over Frame Relay
IPSec IP Security
IPX Inter-network Packet Exchange
ISDN Integrated Services Digital Network
ISO International Standards Organization
ISP Internet Service Provider

ISUP ISDN User Part

IT Information Technologies
ITU International Telecommunications Union
IWF Interworking Function
IWU Interworking Unit
IXC Long-distance carrier

JTAPI Java TAPI

LAN Local Area Network
LANE LAN Emulation
LEC Local Exchange Carrier
LEX Local Exchange
LL Leased Line
LMDS Local Multipoint Distribution System
LPC Linear Predictive Coding

MAC Medium Access Control
MAN Metropolitan Area Network
MAP Mobile Application Part

MAP Messaging Application Protocol
MCU Multicast Control Unit

MExE Mobile station application EXecution Environment

MFC Multi-Frequency Code
MG Media Gateway
MGC Media Gateway Controller
MGCP Media Gateway Control Protocol
MIB Management Information Base
MIME Multipurpose Internet Mail Extension
MMI Multimedia Information
MMI Man-Machine Interface
MOS Mean Opinion Score
MPEG Motion Picture Expert Group
MPLS Multi-Protocol Label Switching

MPOA Multi-protocol over ATM
MSAC Multi-Service Access Concentrator
MSC Mobile Switching Centre

MSDSL Multirate Symmetric DSL
MSS Mobile Satellite System

MT Mobile Terminal
NAP Network Access Point
NE Network Element
N-ISDN Narrowband ISDN
NML Network Link Manager

NNI Network-Network Interface
NT Network Termination

OA&M Operation, Administration and Maintenance

OADM Optical ADM
ORL Open Real-time Link
OSI Open System Interconnection
ODXS Optical DXS
OSPF Open Shortest Path First

PBX Private Branch Exchange
PC Personal Computer

PCM Pulse Code Modulation
PCN Personal Communications Network

PCS Personal Communications Services

PDA Personal Digital Assistant

PDU Protocol Data Unit
PDH Plesiochronous Digital Hierarchy
PHS Personal Handyphone System
PHY Physical Layer
Pel Minimum-size picture element
PIC Personal Intelligent Communicator
PIN Personal Identification Number

PINT Private Integrated Network Termination

PINX Private Integrated Network Exchange

PLMN Public Land Mobile Network

PN Personal Number
PN Private Network
PNE Private Network Emulation

PNNI Private Network Node Interface

PON Passive Optical Network
PoP Point-of-Presence
POTS Plain Old Telephone Service
PPP Point-to-Point Protocol

PPS Prepaid Service
PRI Primary Rate Interface
PSTN Public Switched Telephone Network
PVC Permanent Virtual Circuit
PVN Private Virtual Network

QoS Quality of Service
QSIG Signaling at Q-Reference Point of ISDN

RADSL Rate Adaptive DSL
RAN Radio Access Network
RAS Remote Access Server
RFC Request for Comments
RIP Routing Information Protocol

RISC Reduced Instruction Set Computer

RLA Remote LAN Access
RMI Java Remote Method Invocation
RNC Radio Network Controller
RSVP Resource Reservation Protocol
RT Real Time
RTCP RTP Control Protocol
RTP Real-time Transport Protocol

SCE Service Creation Environment
SCP Service Control Point
SDH Synchronous Digital Hierarchy
SDSL Symmetric Digital Subscriber Line

SDV Switched Digital Video
SG Signaling Gateway

SIM Subscriber Identity Module
SIP Session Initiation Protocol
SLA Service Level Agreement

SMDS Switched Multimegabit Data Services

SMP Service Management Point
SMS Short Message Service
SMTP Simple Mail Transfer Protocol
SNA System Network Architecture

SNMP Simple Network Management Protocol

SOHO Small Office/Home Office

SONET Synchronous Optical NETwork

SS7 Signaling System No. 7
SSF Service Switching Function
SSP Service Switching Point

STB Set-Top Box

STMA System Trunk Module ATM

SVC Switched Virtual Connection

T1 PCM multiplex signal at 1544 kbit/s (US standard)

TAPI Telephony API

TC Traffic Class
TCP Transmission Control Protocol
TD-CDMA Time Division CDMA
TDM Time Division Multiplexing
TEX Transit Exchange

TIPHON Telecommunications and Internet Protocol
Harmonization Over Network Project
ToS Type of Service
TSAPI Telephony Service API

UBR Unspecified Bit Rate

UDP User Datagram Protocol
UDSL Universal ADSL
UIM UMTS Identity Module
UMTS Universal Mobile Telecommunications System
UNI User Network Interface
UPT Universal Personal Telecommunications
USIM User Service Identity Module
USSD Unstructured Supplementary Service Data
UTP Unshielded Twisted Pair
UTRA UMTS Terrestrial Radio Access
UTRAN UMTS Terrestrial Radio Access Network UMTS

VAD Voice Activity Detection
VBR Variable Bit Rate

VCI Virtual Channel Identifier
VCI Virtual Path Identifier
VDS Very high-speed DSL
VHE Virtual Home Environment
VLAN Virtual LAN
VLR Visitor Location Register
VoATM Voice over ATM
VoD Voice over Data
VoD Video-on-Demand
VoFR Voice over Frame Relay

VoIP Voice over IP
VPN Virtual Private Network

WAN Wide Area Network
WAP Wireless Application Protocol
W-CDMA Wideband CDMA
WDM Wave-Division Multiplexing

WLAN Wireless LAN

WLL Wireless Local Loop
WML Wireless Markup Language
WP-CDMA Wideband Packet CDMA
WTA Wireless Telephony Applications
WTP Wireless Transaction Protocol
WWW World-Wide Web

xDSL Digital Subscriber Line