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Telephone Line Connection

There are several different types of telephone line available from service provid-

ers.

DigiCom, Dualcom, the CSL range of Control Panels and most other intruder

alarm equipment requires an analogue telephone line connection. ‘Earth Loop

Calling’ or ‘Earth Calling’ types of analogue telephone line can not be used.

Equipment that requires an analogue line can not be connected directly to

digital ISDN or digital or hybrid ADSL telephone lines.

Details of these lines and connections follow.

Analogue PSTN Telephone Line

The analogue PSTN is a communication network where the line from the ex-

change equipment and the service supplied to the subscriber is ‘analogue’, i.e.

not ‘digital’.

A telephone line is always terminated at the users premises by an NTP (Net-

work Termination Point) which is provided by the Telecoms Service Provider.

This is a socket or connection where the users equipment can be connected.

Some NTPs provide a socket and terminals for connection. In many cases,

the NTP operates using power supplied from the exchange equipment via the

telephone line. See Fig 9.

An analogue PSTN telephone line may be provided by BT or any of the other

44 telecomms service providers in UK. Dualcom can be connected to this ana-

logue line. See Fig 9. Refer also to the ‘safety Earth’ and the ‘Call Minder’

sections.

Analogue PSTN Telephone Line

Fig 9

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