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The ‘Call Minder’ call answering Service

Some telecom Service Providers offer a call answering service. This will answer

incoming calls if the subscriber’s telephone is not answered within a number of

rings. Dualcom NVM programming may need changing to ensure operation

when this service is provided.

This service is available from BT in most areas of the UK on Analogue PSTN,

ISDN, Home Highway and Hybrid ADSL lines. It may also be available from

other telecom Service Providers. Dualcom may be connected to lines offering

this service. See earlier connection information.

This service indicates to the subscriber that an earlier call has been recorded

and should be heard by pulsing the dial-tone on subsequent calls. See the

table below.

Dial Tone Dialing Answered calls

Continuous You may dial There are no answered calls

Pulsed You may dial There are answered calls

waiting to be heard

The Dualcom NVM is normally programmed to require a dial-tone of 1 second

before it will dial the number of the ARC to send its alarm information. When the

dial-tone is pulsed as described above, the NVM programming must be changed

to 0.1 second dial-tone detection to ensure correct operation.

Contact CSL Technical Support for more information.

Safety Earth connection

Some equipments require an Earth connection to meet the safety requirement

of testing and approval, e.g. Dualcom & DigiCom. Other equipment designs

provide electrical safety with no Earth connection, e.g. CS0700 Converter.

Where an ‘E’ or Earth connection is provided at the telephone line terminals of

equipment, then this must be connected to an Earth point. See Fig 9 and 10.

Ideally, the Earth point should be an Earth stake in the ground, close to the

equipment. Where this is unavailable, then a connection to the Mains supply

Earth should be used.

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Connect Systems CS1001 Installationshandbuch Seite 30