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A digital communicator transmits alarm messages via the Telephone Network and can be connected to any standard telephone line whether provided by British Telecom or your local cable operator, without modification or alteration to your service. It is recommended however, that connection is made to a dedicated “out-going calls only” telephone line, or that the line has an ex-directory telephone number.
BT Redcare / Redcare GSM
A more secure method uses the Redcare network to transmit alarm signals to the monitoring centre. Redcare uses an existing BT telephone line (but not usually one connected to a fax or modem).
In a system employing Redcare signaling your alarm panel is fitted with a special device known as a STU (Subscriber Terminal Unit). The STU has a permanent communication path with a receiver in the local telephone exchange. The exchange receivers are constantly monitored by the Redcare Host computer which in turn has a permanent connection to the Alarm Receiving Centre.
Signals are sent immediately via the open communications patch without the need to dial up, and can even be sent whilst the line is being used for other calls. In addition to this the Host constantly polls the STU to check on its condition. If the patch to the STU has been damaged or tampered with the Central Station will be notified that the telephone line has been cut.
Redcare GSM take the principal of secure signaling a step further by adding a back-up service across the GSM (radio/Mobilephone) Network. If either signaling path should fail for any reason, a back-up alternate patch will continue to signal alarm conditions to the monitoring centre. Increasingly, insurers are demanding Redcare GSM connections for high risk / commercial installations as it meets the highest standard laid down in the new European Standard for Alarm Installations BS EN50131
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