System for transmitting alarm information over telephone lines

Details System for transmitting alarm information over telephone lines System for transmitting alarm information over telephone lines

H - Electricity

04

M

379/8

H04M 11/04 (2006.01) G08B 25/08 (2006.01) G08B 26/00 (2006.01)

Patent

CA 1096520

ABSTRACT An alarm system for transmitting alarm information via telephone lines has a plurality of alarm transmitters which are located at subscribers' premises and are adapted to transmit signals indicative of the state of alarms associated with the transmitters along telephone lines to associated receivers. The receivers are located at one or more local exchanges and the receivers at a local exchange are all connected to a local processor. The or each local processor is connected to a central processor which can direct alarm information to one of a number of terminal stations. the local processors continuously scan the outputs of the receivers. When a local processor detects a signal indicative of an alarm condition it transmits a signal coded with the subscriber identity and destination for the alarm information to the central processor which routes the alarm message to the appropriate terminal station. Each transmitter produces a carrier wave which is modulated with one or more other frequencies according to the state of the alarm being monitored.

297932

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