System diagnostic mode for security central station receiver

Abstract From the Canadian patent

A system diagnostic mode is provided for a security central station receiver that monitors the operations of a large number of individual security systems over a large number of telephone lines. The system diagnostic mode provides the receiver with the capability to test itself for proper operation after it has been initially installed or on a repeated basis thereafter, to ensure that the receiver at the security central station is fully operational. A plurality of line cards are designed to serve and interface with the large number of telephone lines. The auto test diagnostic mode tests the operation of the central station receiver and is programmed to automatically dial into each of the …