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


Abbreviated Dial A stored number which can be dialled by entering a short code
ACD Automatic Call Distribution, a system to distribute calls evenly between a number of connecting telephones
ADSL Asymmetric Digital Subscriber Loop, a new service allowing permanent data connection and voice to SOHO style users over their existing telephone line wiring.
ARS Automatic Route Selection, a system which chooses the cheapest available network by which to dial a call
Automated Attendant A system which answers incoming calls, playing a greeting message and requesting a response which it uses to route the call to the required destination, offering the opportunity to chose an alternative destination or taking a message if the destination is busy
Basic rate interface 2 bearer channel interface to ISDN
Bps Bits Per Second, indicating the speed of data transfer across telephone lines
BRI See Basic Rate Interface
Brokers Call One telephone making two calls and switching between them as required
BT British Telecommunications PLC
Call Barring A method of controlling the calls which can be made from a telephone
Call Divert A facility to re-direct an incoming call to another designated telephone
Call Forward See Call Divert
Call Intrude The ability to break into another call
Call Pick Up Allowing a telephone to answer a call ringing at another telephone
Call Waiting Signalling into a call indicating another call is trying to get through
Calling Line Identity The calling party’s number is sent to and displayed at the receiving telephone
Camp On A call waiting that will ring through when the called telephone becomes free
CCITT Committee Consultative International Telegraph et Telephone
CCU Central Control Unit of a telephone system
Centrex A system where a section of a large exchange can be rented and used as a ‘sub’ system where all telephones are extensions of the large system
Chain Dialling Dialling a sequence of memory locations stored in another memory
Co-ax Co-Axial cable, a central conductor surrounded by an insulator and metal stranded sheath
Conference Call A single call connecting more than two parties all able to talk to each other
COS Class Of Service, a set of parameters governing how a telephone can be used
CPC A Signal from the exchange to tell the receiving equipment that the calling party has cleared
CPU Central Processing Unit - the ‘brain’ of a piece of equipment
CRA Call Routing Apparatus
Cross Talk The interference by a call into other calls
CT2 Cordless Telephone 2 digital cordless telephone standard
CTI Computer-Telephone Integration, allows these devices to operate together



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Extracted from

Introduction To Line Telecommunications
Copyright Panasonic Business Systems UK Ltd 2000