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ACD
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Automatic Call Distribution –
The system used to distribute calls through to those responsible for answering.
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ADSL
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Asymmetric Digital Subscriber Line –
Another name for broadband with different upload and download speeds.
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BRA
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Basic Rate Access-
Another name for ISDN2 Digital phone lines.
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CCU
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Central Control Unit –
The box on the wall that runs your phone system.
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CLI
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Calling Line Identity –
Your phone number.
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CPS
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Carrier Pre Selection –
A service where you can pre select who carries your phone calls on your BT line.
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CTI
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Computer Telephony Integration –
Linking your PC and phone together.
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DASS
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Digital Access Signalling System –
An old type of signalling used on phone lines now replaced with a Euro version.
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DDI
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Direct Dial Inwards –
Used so people from outside can dial straight through to your phone and bypass the switchboard.
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DPNSS
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Digital Private Network Signalling System –
A name given to signals used between 2 phone systems.
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DTMF
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Dual Tone Multi Frequency –
The tones you hear when you make a phone call.
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FPS
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Fax Preference Service –
Stop unwanted faxes (Junk Fax) coming in.
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FTTP
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Fibre to the premises –
Installation of optical fibre from the carrier directly into the home or office.
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FTTC
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Fibre to the cabinet –
Fibre cable runs from a BT exchange to a street cabinet.
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ISDN
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Integrated Services Digital Network –
A name for digital phone lines.
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ISP
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Internet Service Provider –
Who bills you for your broadband is your ISP.
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ICSTIS
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Independent Committee for the Supervision of Telephone Information Services
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LLU
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Local Loop Unbundling –
The ability for other operators to use the cables between the phone exchange and your premises.
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NGN
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Non Geographic Numbers –
Numbers not tied to an area such as 0800 Freephone.
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OCB
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Outgoing Calls Barred –
Stops you dialling out when it is applied to your phones.
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PSTN
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Public Switched Telephone Network –
The phone network.
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PABX
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Private Automatic Branch Exchange –
A name for a telephone system.
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PMBX
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Private Manual Branch Exchange –
Another name for a telephone system.
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SDSL
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Synchronous Digital Subscriber Line –
Another name for broadband with the same upload and download speeds.
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SIP
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Session Initiation Protocol –
Name for signalling when making phone/data calls.
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UPS
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Uninterrupted Power Supply –
Will keep phones working when there is a power cut.
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VDSL
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Very high bandwidth DSL –
A very fast internet connection.
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VOIP
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Voice Over Internet Protocol –
Making phone calls over the internet instead of over the phone line.
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WAN
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Wide Area Network –
Computers from different buildings linked together.
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