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AC15

A signalling system used for linking two pieces of telecommunications equipment (e.g. two telephone systems) over a distance.

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Account Code

A way of attaching a "tag" to a call record. This might be used to indicate that the call is to be charged to a particular account or to indicate the outcome of a call (a sale was made, a brochure requested etc.) Call Management systems can then produce reports listing all calls with the same account codes. Account codes can be attached to incoming and outgoing calls, and it can be made mandatory for an extension user to enter an account code before a call is made.

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ACD

Automatic Call Distribution
 - An automated system for answering, queuing and distributing incoming calls to a number of agents. Popular in call centres, ACD systems also provide statistics, such as the number of calls waiting, average length of call queue etc, which can be incorporated into historical reports or displayed in real time on electronic wallboards.

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Adapter

A device that (1) enables different sizes or types of plugs to mate with one another or to fit into an information outlet, (2) provides for the rearrangement of leads, (3) allows large cables with numerous wires to fan out into smaller groups of wires, or (4) makes interconnections between cables.

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Ad Hoc Cabling

Cabling scheme where different types of cabling components from different vendors are linked together to form a cabling system.

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ADSL

Asynchronous Digital Subscriber Line
A broadband technology that delivers high data transfer speeds over existing phone lines. Can reach speeds up to 2 mb.