SECURITY SYSTEMS

摘要

A security system includes a service platform (4) attached to a telephone network and accessible through the network. The platform (4) is responsive to calling line identity signals (CLI) provided by the network operator to identify individual telephone lines (7) from which calls originate and in response thereto to transmit a data list identifying protected apparatus (5) at customer premises (3) and release codes therefor. A home control centre (2) is responsive to signals received over a mains electricity line from protected apparatus (5) to transmit to the apparatus a release code, the apparatus including a security module responsive to receipt of the respective release code to supply power to operational circuits of the apparatus. If a valid release code is not received from the home control centre (2) on request from the apparatus (5) then power is denied to the apparatus. The service platform (4) supplies a house code and a specific apparatus code and location code to the home control centre (2) for transmission to a protected apparatus (5) on first connection of mains power thereto. Subsequent to the security protection being provided, the apparatus will only operate when connected in its home environment until such time as a blanking message is received from the service platform (4).