SICHERHEITSSYSTEM

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 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.