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Glossary of Terms
relating to DECT and other topics in  cordless telecommunications

This glossary is reproduced from the recent book 'Cordless Telecommunications Worldwide', with kind permission from the author and the publishers, Springer Verlag.  Most of the terms are explained in considerable more detail in the book.   

If you've looked for a term which you think ought to be in here that isn't, please tell us, so that we can include it in a coming update.  Thank you.



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ACCH Associated Control Channel

ACELP Algebraic Code-Excited Linear Prediction Vocoder

ACK Acknowledgement protocol

ACTE Approval Committee for Telecommunication Equipment

ACW Address Code Word

ADM Adaptive Delta Modulation

ADPCM Adaptive Differential Pulse Code Modulation

AGC Automatic Gain Control

AIN Advanced Intelligent Network

ALT Automatic Link Transfer

AM Access Manager

AMPS American Mobile Phone System, US cellular standard

API Application Programming Interface

ARA Alerting / Registration Area

ARI Access Rights Identifier

ARIB Japanese Association of Radio Industries and Businesses

ARQ Automatic Repeat Request

ATIS The US Alliance for Telecommunications Industry Solutions

AWGN Additive White Gaussian Noise


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B Echo Balance Return Loss

B channel User information bearer channel, 64 kbits/s, in ISDN

BABT British Approvals Board for Telecommunications

BCCH Broadcast Channel

BCT Business Cordless Telephone

BER Bit Error Ratio

BMC / BMD Burst Mode Controller / Device

BPSK Binary Phase Shift Keying modulation

BRA ISDN Basic Rate Access

BS Base station - the fixed radio component of a cordless link, single channel or multi channel. Term also used in cellular radio

BSC Base station controller

BS6833 A UK standard for digital cordless telephones allowing for proprietary air interfaces, (mainly specifying telephony related aspects)

BT Bandwidth-Time product for GMSK modulation

BTR Bit Timing Recovery, used to permit synchronisation across a radio link


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CAI Common Air Interface Standard, as in the CT2 standard

CAS Cordless Access Service(s)

CATV Cable Television

CBCS Cordless Business Communication System, supporting wireless PABX and data applications, for example, in the business environment

CCCH Common Control Channel

CCF Cluster Control Functions

CCFP Common Control Fixed Part

CCH Control Channel

CCT Combined CDMA / TDMA (IS-661 standard)

CCIR Consultative Committee for Radio, part of the previous ITU structure (now ITU-R)

CCITT Consultative Committee for Telecommunications, part of the previous ITU structure (now ITU-T)

CDC Cordless Data Controller

CDMA Code Division Multiple Access

CEC Commission of the European Communities

CELP Code Excited Linear Prediction, vocoder

CEN Comité Européen de Normalisation

CENELEC Comité Européen de Normalisation Electrotechnique

CEPT Conference of European Posts and Telecommunications

CFP Cordless Fixed Part , eg a cordless telephone base station

CHMF Synchronisation pattern used in CT2

CHMP Synchronisation pattern used in CT2

CI Common Interface, type of specification or

Channel Identity sequence, used for over the air identification of a radio transmission

CISPR Comité International Spécial Perturbations Radio

CLR Connection Loudness Rating

COST The European Cooperation in Science and Technology Programme

COST 231 The COST committee dealing with future mobile systems

CPBX Cordless PBX - same as a wireless PBX

CPE Customer Premises Equipment

CPFSK Continuous Phase Frequency Shift Keying modulation

CPP Cordless Portable Part, the cordless telephone handset carried by the user

CR Carrier Recovery

CRC Cyclic Redundancy Check

CRFP Cordless Radio Fixed Part

CS Cell Station, a PHS basestation

CS2, CS3 Intelligent Network, Capability Set 2, 3

CS-ACELP Conjugate Structure Algebraic Code-Excited Linear Prediction, vocoder

CSF Cell Site Function

CSMA Carrier Sense Multiple Access

CSMA/CA Carrier Sense Multiple Access with Collision Avoidance

CT0 The original analogue VHF/LF cordless telephone technology, as used in the UK, France and elsewhere

CT1 Cordless Telephone Generation One - in Europe 900 MHz analogue FM - also known as CEPT/CT1.

Sometimes in the UK the term was and occasionally still is used to refer to the CT0 technology

CT1+ Later version of the CEPT CT1 standard, with additional channels

CT2 Second Generation Cordless Telephone - Digital - originally developed in the UK and subsequently accepted by ETSI as an IETS

CT2plus Canadian variant of CT2

CT3 Early Swedish digital cordless standard

CTM Cordless Terminal Mobility, an ETSI project as well as an application concept

CTN Cordless Telecommunication Network

CTR Common Technical Regulation

CVSDM Continuously Variable Slope Delta Modulation


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D channel Control and information data channel, 16 kbits/s in ISDN

DAM DECT Authentication Module

DASS Digital Access Signalling System

DCA Dynamic Channel Assignment

DCE Data Communications Equipment

DCS Dynamic Channel Selection or

Digital Cellular System (see DCS1800)

DCS1800 Digital Cellular System 1800 MHz - the 1800 MHz version of the GSM digital cellular radio standard

DCT Digital Cordless Telephone

DCT900 Early CT3 standard cordless telephone product from Ericsson

DCW Data Code Word

DECT Digital Enhanced Cordless Telecommunications, the ETSI standard

(originally, prior to 1995, Digital European Cordless Telecommunications)

DFS DECT Fixed System

DLC Data Link Control layer, protocol layer

Downlink The transmission link from the fixed part to the portable part

DPCM Differential Pulse Code Modulation

DPNSS Inter PABX signalling system

DPS DECT Portable System

DQPSK Differential QPSK modulation

DRT Diagnostic Rhyme Test, used in speech quality measurements

DSP Digital Signal Processing

DSS1 ISDN signalling protocol

DTAAB DECT Type Approval Advisory Board

DTI UK Department of Trade and Industry

DTMF Dual Tone Multiple Frequency, audio tone signalling system

Duplex Simultaneous two way communication

DVSDM Digitally Variable Slope Delta Modulation


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EC European Commission

ECMA European Association for Standardising Information and Communication Systems

ECTEL European Association of the Telecommunications Manufacturing Industry

EFR Enhanced Full Rate codec, developed for US PCS

EMC ElectroMagnetic Compatibility

EOC Embedded Operations Channel

ERC European Radiocommunications Committee

ERO European Radiocommunications Office

ERMES European Radio MEssaging Standard, digital paging standard specified by ETSI

ERP Effective Radiated Power or

Earpiece Reference Point

ESPA European Selective Paging Association

ETR ETSI Technical Report

ETS European Telecommunications Standard

ETSI European Telecommunications Standards Institute


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FACCH Fast Associated Control Channel

FCC US Federal Communications Commission

FCS Free Channel Search or

Frame Check Sequence

FDD Frequency Division Duplex

FDMA Frequency Division Multiple Access

FEC Forward Error Correction

FH Frequency Hopping

FHMA Frequency Hopping Multiple Access

FPLMTS Future Public Land Mobile Telecommunications System

FSK Frequency Shift Keying

FT Fixed termination


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GAP Generic Access Profile of DECT

GFSK Gaussian filtered FSK modulation

GIP GSM Interworking Profile of DECT

GMSK Gaussian filtered Minimum Shift Keying

GoS Grade of Service

GPRS Generalised Packet Radio Service, of GSM

GPS Global Positioning System

GSM Global System for Mobile, the digital cellular radio system specified by ETSI and now adopted in many countries worldwide


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Handoff The procedure whereby communications between a cordless terminal and a basestation are automatically routed via an alternative basestation (or possibly via an alternative channel to the same base station) when this is necessary and appropriate to maintain or improve communications

Handover Another term for Handoff

HDLC High level Data Link Control - type of protocol

HIPERLAN HIgh PErformance Radio Local Area Network

HLR Home Location Register, used in cellular systems and which might be used in future enhanced public cordless systems


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IAP ISDN Access Profile, of DECT

IEC International Electrotechnical Commission

IEEE 802.11 US spread spectrum data communication standard

I-ETS Interim ETS

IF Intermediate Frequency

IMEI International Mobile station Equipment Identity (GSM feature)

IN Intelligent Network

INAP Intelligent Network Application Part

IPEI International Personal Equipment Identity (DECT feature)

IS54 US digital AMPS standard

IS95 US CDMA cellular standard

ISDN Integrated Services Digital Network

ISM Industrial, Scientific and Medical frequency band

ISO International Standards Organisation

ISPABX Integrated Services PABX

ITSTC Information Technology Steering Committee

ITU International Telecommunications Union

IWP Interworking Profile

IWU Interworking Unit


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JLR Junction Loudness Rating

JTC The TIA/T1 Joint Techncal Committee, US PCS standardisation committee


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LAN Local Area Network

LAPB Link Access Protocol - Bearer channel

LAPD Link Access Protocol - Data channel

LAPR Link Access Protocol Radio

LAI Local Area Identifier

LBT Listen Before Talk, part of the US UPCS spectrum etiquette, FCC Part 15 Subpart D rules

LCD Liquid Crystal Display

LCI Local CFP Identifier

LDB Location Data Base

LD-CELP Low Delay Code Excited Linear Prediction, vocoder

LDM Linear Delta Modulation

LE Local Exchange

LEC Local Exchange Carrier

LFA Lowest Frequency below threshold Algorithm

LIA Least Interference Algorithm

LLME Lower Layer Management Entity

LNA Low Noise Amplifier

LPC Linear Predictive Coding

LR Loudness Rating or

Location Register (as in cellular radio)


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MAC Medium Access Control, protocol layer

MAHO Mobile Assisted HandOver

MAP Mobile Access Part, of the SS7 protocol

MC Marker Channel

MCHO Mobile Controlled HandOver

MDT Mobile Data Terminal

Microdiversity Diversity between antennas with relatively small spacing (of order quarter wavelength) to counter multipath fading effects

MKK Radio Equipment Inspection and Certification Institute of Japan

MMI Man Machine Interface

MOS Mean Opinion Score, used in speech quality measurements

MoU Memorandum of Understanding

MPEG Motion Pictures Expert Group, developing video codec standards

MPT1317 UK standard for data signalling over a radio path

MPT1334 UK standard for digital cordless telephones allowing for proprietary air interfaces, (mainly specifying radio related aspects)

MPT1375 UK standard for Common Air Interface, CAI, digital cordless telephones

MRP Mouthpiece Reference Point

MSC Mobile services Switching Centre, as in cellular radio

MSK Minimum Shift Keying modulation

MUX1 The traffic channel multiplex in PCI, same as MUX1.4 in CT2

MUX1.2 The multiplex within the CT2 standard containing 64 B channel bits and 2 D channel bits

MUX1.4 The multiplex within the CT2 standard containing 64 B channel bits and 4 D channel bits

MUX2 The multiplex within the CT2 standard containing 32 D channel bits and 32 SYN channel bits

MUX3 The "long" 10 ms burst transmitted by a CT2 handset when trying to establish a call


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NACK Not Acknowledge - a form of protocol where action is taken if no acknowledgement is received

NAFTA North American Free Trade Area - USA, Canada and Mexico

NAMPS Narrowband AMPS cellular standard

NCHO Network Controlled HandOver

NET Norme Européenne de Télécommunications, a type of standard

NMT Nordic Mobile Telephone, an analogue cellular standard

NPAG North American PCS Advisory Group

NTIA National Telecommunications Information Administration (in the USA)

NWK/NWL Network Layer, protocol layer


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O&M Operations and Maintenance

OAM Operations, Administration and Maintenance

OAM&P Operations, Administration, Maintenance and Provisioning

OCDMA Orthogonal CDMA

OELR Overall Echo Loudness Rating

OFS Operational Fixed Services

OFTA Office of the Telecommunications Authority, Hong Kong

OFTEL The UK Office of Telecommunications

OLR Overall Loudness Rating

OSI Open Systems Interconnection - The ISO standard for communications, a seven layer reference model for protocol specification

OTAR Over the air registration


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P&A Privacy and Authentication

PA Portable Application or

Power Amplifier

PABX Private Automatic Branch Exchange

PACS Personal Advanced Communication System

PACS-UA PACS variant A for the US unlicensed bands, related to PHS

PACS-UB PACS variant B for the US unlicensed bands

PAP Public Access Profile, of DECT

PARK Portable Access Rights Key

PBX Same as PABX

PCH Paging Channel

PCI Personal Communications Interface, US unlicensed standard based on CT2

PCM Pulse Code Modulation

PCMCIA Personal Computer Manufacturers' Card Industry Association, a standard for plug-in PC cards, now known also simply as PC Card

PCN Personal Communications Network

PCS Personal Communications Service

PCS1900 US cellular standard, 1900 MHz version of DCS1800

PDA Personal Digital Assistant

PDC The Japanese Personal Digital Cellular standard

PHL Physical Layer, lowest protocol layer

PHS Personal Handyphone System - Japanese cordless standard

PIC Personal Intelligent Communicator

PINX Private Integrated services Network eXchange

PISN Private Integrated Services Network

PLL Phase Lock Loop

PLMN Public Land Mobile Network

PMR Private Mobile Radio

PP Portable Part

PRA ISDN Primary Rate Access

PS Personal Station

PSK Phase Shift Keying modulation

PSTN Public Switched Telephone Network

PT Personal Telecommunications or

Portable Termination or

Project Team (in ETSI)

PTN Personal Telephone Number

PTO/PTT Term used to refer to a national telecommunication administration

PWT Personal Wireless Telecommunications - US cordless technology, a variant of DECT.

PWT(E) PWT (Enhanced) - enhanced version of the PWT technology for operation in the licensed PCS bands


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QDU Quantisation Distortion Unit

QPSK Quadrature Phase Shift Keying modulation

QSAFA Quasi-Static Autonomous Frequency Assignment

QSIG Inter PABX signalling protocol

Quantisation The process of representing samples of an analogue waveform by the nearest whole number of pre-defined voltage steps


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RACE Research and development in Advanced Communication technologies in Europe, research initiative instigated by the CEC

RAP Radio local loop Access Profile of DECT

RBOC Regional Bell Operating Company

RCR Research & Development Centre for Radio Systems of Japan

RES 3 Technical subcommittee, Radio Equipment and Systems 3, of ETSI, responsible for the specification of cordless systems

RFI Radio Frequency Interference

RFP Radio Fixed Part - same as Cordless Fixed Part

RLAN Radio Local Area Network

RLL Radio Local Loop

RLR Receiving Loudness Rating

RP Radio Port

RPCU Radio Port Controller Unit

RPE-LTP Regular Pulse Excitation - Long Term Predictor, type of LPC speech coding used in the GSM digital cellular radio system

RSSI Received Signal Strength Indication


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SACCH Slow Associated Control Channel

SAW Surface Acoustic Wave

SBC System Broadcast Channel

SCCH Specific Cell Channel

SCI Synchronisation, Control and Information

SDL System Description Language

SDLC Synchronous Data Link Control

Sidetone An attenuated component of the speakers voice signal fed back to his own earpiece to provide confidence that the equipment is functional

SIM Subscriber Identification Module, of GSM

Simplex One way communication

SLR Sending Loudness Rating

SMS Short Message Service, of GSM

SMT Surface Mount Technology

SNR Signal to Noise Ratio

SoHo Small Office / Home Office

SPCS Satellite Personal Communications System

SQER Signal-to-Quantising-Error Ratio

STMR Side Tone Masking Rating

SU Subscriber Unit

SYN The channel used in CT2 to allow synchronisation to be established

SYNCD Synchronisation pattern used in CT2

SYNCF Synchronisation pattern used in CT2

SYNCP Synchronisation pattern used in CT2


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TACS Total Access Communication System - an analogue cellular system, based upon AMPS, the US system

TAL Telephone Acoustic Loss

TBR Technical Basis for Regulation, a European standard mechanism

TCH Traffic Channel

TCL Telephone Coupling Loss

TDD Time Division Duplex

TDM Time Division Multiplex

TDMA Time Division Multiple Access

TE Terminal Equipment

TELR Talker Echo Loudess Rating (nearly the same as OELR)

TIA The US Telecommunications Industry Association

TIM Telephone Identity Module

TRAC Technical Recommendations Applications Committee

TTC The Japanese Telecommunication Technology Committee


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UIC User Information Channel

UMC Universal Mobile Communicator

UMTS Universal Mobile Telecommunication Service, being standardised by ETSI

UNI User Network Interface

UPCH User Packet Channel

UPCS Unlicensed PCS

Uplink The transmission link from the portable part to the fixed part

UPT Universal Personal Telecommunications

UW Unique Word, used for synchronisation and/or identification across a radio link


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VCO Voltage Controlled Oscillator

VDU Video Display Unit

VPN Virtual Private Network


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WACS Wide Area Communication System, wireless access technology developed by Bellcore, which has formed the basis for PACS

WCPE Wireless Customer's Premises Equipment, DECT based standard now referred to as PWT

WDCT Worldwide Digital Cordless Telecommunications - a Siemens proprietary digital cordless standard for products marketed in the USA, a derivative of the DECT standard, augmented to operate in the ISM band (2.4 GHz) and to comply with FCC rules.

WLAN Wireless Local Area Network

WLL Wireless Local Loop

WPABX Wireless Private Automatic Branch Exchange

WPBX Wireless Private Branch Exchange

WRC World Radio Conference, part of the ITU activity, superceding the previous WARC process

WRS Wireless Relay Station

WUPE Wireless User Premises Equipment

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