Introduction To Line Telecommunications

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19. Jargon Buster

This section lists the commonly used features, services and terms encountered with line telecommunications equipment.


A - to - C


D - to - O

P - to - Z


DASS / DASS II Digital Access Signalling System protocols used on UK ISDN
DCE Data Communication Equipment
DDI Direct Dialling Inwards, a part of the dialled number is passed to the destination equipment and used to route the call to the required telephone
DECT Digital European Cordless Telephone specification
DID Direct Inward Dialling, a specific line is set to ring a specific extension
DISA Direct Inward System Access, the system answers the incoming call and accepts DTMF dialling from the caller to determine the required destination extension
DND Do Not Disturb, prevents incoming calls ringing
DPNSS Digital Private Network Signalling System
DTE Data Terminal Equipment
DTMF Dialling, the sending of tone combinations to represent the numbers required
Dual Tone Multi Frequency
Dual Tone Multi-frequency See DTMF
Earth Recall A signal from telephone to the exchange/PBX to hold a call or access a feature
FAX Facsimile machine or facsimile transmitted document
FAXTAM Facsimile with built in telephone answering machine
Flash A signal to clear the current call and retain the line for a follow on call
Headset Similar to Hi-Fi headphones with a microphone and boom. Replaces the handset
Hold The speech too and from the caller is muted and in some cases they are played music, whilst on hold.
Hook Switch The switch which loops (busy) and un-loops (idle) the telephone from the line
ICM Incoming Message, recorded by a telephone answering machine
IDD International Direct Dialling
Inductive Coupler A device fitted to handsets to allow a telephone to transmit speech to hearing aids for users with hearing impediments
ISDN Integrated Services Digital Network
ISDN 2 BT basic rate interface for ISDN
ISDN 30 BT primary rate interface for ISDN
ITU International Telecommunications Union, formerly the CCITT
Key System A system offering a key and lamp representation of lines and or extensions, usually requiring proprietary telephones
Kilostream 64 Kbps digital leased line
KTS Key Telephone Set or Key Telephone System
Last Number Redial The last number dialled is stored and can be dialled by a single button or short code at a later time
LCD Liquid Crystal Display
Loop Disconnect See Pulse Dialling
MCL Abbreviation for Mercury Communications Ltd
Megastream 2 Mbps digital leased line
Memory Storage for a telephone number allowing the number to be dialled using a single button or short code
Mercury Button A special memory location allowing the users Mercury PIN and access code to be sent with a single button press
Meter Pulses Signals from the exchange signalling the increment of charge units for a call
Modem MODulator/DEModulator
Multiplexer A device to combine calls onto a single transmission medium
Music On Hold Music played through a system to callers placed on hold
OGM Outgoing Message, played by the answering machine to callers
On Hook Dialling The ability to dial a number without needing to lift the handset



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Extracted from

Introduction To Line Telecommunications
Copyright Panasonic Business Systems UK Ltd 2000