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Abbreviations
Glossary
Standards
 

21CN - BT's 21st Century Network

ACD - Automatic Call Distribution

ADC - Analogue to Digital Convertor

ADSL - Asymmetrical Digital Subscriber Line

ADPCM - Adaptive Differential Pulse Code Modulation

ANI - Automatic Number Identification

API - Application Programming INterface

ARS - Automatic Route Selection

ASCII - American Standard Code for Information Interchange

ATM - Asynchronous Transfer Mode

BER - Bit Error Rate

BHCA - Busy Hour Call Attempts

BHCC - Busy Hour Call Completions

BRA / BRI - ISDN Basic Rate Access / Interface

BTNR - BT Network Requirement

CCS - Centi-Call Seconds

CCITT - Comité Consultatif International Télégraphique et Téléphonique

CDR - Call Detail Recording (or Record)

CLI - Calling Line Identity

CMS - Call Management System

CO - Central Office

CoS - Class of Service

COTS - Commercial Off-The-Shelf

CP - Communications Provider

CPE - Customers' Premises Equipment

CPS - Carrier Pre-Selection

CRC - Cyclic Redundancy Check

DAC - Digital to Analogue Convertor

DACS - Digital Access Carrier System

DASS - Digital Access Signalling System

DCE - Data Communications Equipment

DDI - Direct Dialling In

DECT - Digital Enhanced Cordless Telecommunications

DID - Direct Inward Dialling

DND - Do Not Disturb

DNIS - Dialled Number Identification Service

DNS - Domain Name System / Server

DPNSS - Digital Private Network Signalling System

DSL - Digital Subscriber Line

DTE - Data Terminal Equipment

DTMF - Dual-Tone Multi-Frequency

DTT - Digital Terrestrial Television

DVB - Digital Video Broadcasting

DWDM - Dense Wavelength Division Multiplex

EDGE - Enhanced Data rates for GSM Evolution

EDI - Electronic Data Interchange

ENUM - Electronic Numbering

FDM - Frequency Division Multiplex

FTTC - Fibre To The Cabinet

FTTP - Fibre To The Premises

FX - Foreign Exchange

GPRS - General Packet Radio Service

GSM - Global System for Mobile communications

HSDPA - High Speed Downlink Packet Access

HSUPA - High Speed Uplink Packet Access

HTTP - Hyper Text Transfer Protocol

IC - Integrated Circuit

ICT - Information & Communications Technology

IDC - Insulation Displacement Connection/Connector

IETF - Internet Engineering Task Force

INMARSAT - International Maritime Satellite Organization

INTELSAT - International Telecommunications Satellite Organization

IMS - IP Multimedia Subsystem

IN - Intelligent Network

IP - Internet Protocol

ISDN - Integrated Services Digital Network

ISO - International Standards Organisation

ISP - Internet Service Provider

ITU - International Telecommunications Union

IVR - Interactive Voice Response

LAN - Local Area Network

LASER - Light Amplification by the Stimulated Emission of Radiation

LEC - Local Exchange Carrier

LED - Light-Emitting Diode

LLU - Local Loop Unbundling

LTE - Long-Term Evolution

MAC - Media Access Control

MACs - Moves, Adds & Changes

MACs - Moves, Adds & Changes

MDF - Main Distribution Frame

MNO - Mobile Network Operator

MPLS - Multi-Protocol Label Switching

NAT - Network Address Translation

NCoP - Networking Code of Practice

NGN - Next Generation Network

NSE - Night Service Extension

NTE - Network Termination Equipment

OAM - Operations Administration and Maintenance

OSI - Open Systems Interconnection

PABX - Private Automatic Branch Exchange

PBX - Private Branch Exchange

PC - Personal Computer

PCM - Pulse Code Modulation

PCP - Primary Cross-connection Point

PDH - Plesiochronous Digital Hierarchy

ppm - pence per minute

PPP - Point-to-Point Protocol

PPPoA - PPP over ATM

PPPoE - PPP over Ethernet

PRA/PRI - ISDN Primary Rate Access/Interface

PSTN - Public Switched Telephone Network

PTO - Public Telecommunications Operator

QoS - Quality of Service

RADIUS - Remote Authentication Dial-In User Service

RAID - Redundant Array of Inexpensive Disks

RAM - Random Access Memory

RISC - Reduced Instruction Set Computer

ROM - Read-Only Memory

SAR - Specific Absorption Rate

SCSI - Small Computer System Interface

SDH - Synchronous Digital Hierarchy

SDSL - Symmetrical Digital Subscriber Line

SFP - Small Form-Factor Pluggable

SIP - Session initiation Protocol

SMDR - Station Message Detail Recording

SMS - Short Message Service

SP - Service Provider

SPC - Stored Program Control

SS7 - Signalling System No 7

T&M - Time and Materials

TCP - Transmission Control Protocol

TDM - Time Division Multiplex

ToS - Type of Service

UDP - User Datagram Protocol

UMTS - Universal Mobile Telecommunications System

UPS - Uninterruptible Power Supply

VC - Virtual Circuit [ATM]

VLAN - Virtual LAN [ATM]

VoIP - Voice over Internet Protocol

VP - Virtual Path [ATM]

VPN - Virtual Private Network

WAN - Wide Area Network

WAP - Wireless Application Protocol

WATS - Wide-Area Telephone Service

WDM - Wavelength Division Multiplex

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Page updated 09/09/2011