Central station alarm reporting system

Details Central station alarm reporting system Central station alarm reporting system

H - Electricity

04

L

340/90

H04L 5/14 (2006.01) H04M 11/04 (2006.01)

Patent

CA 1160311

ABSTRACT A central station alarm reporting system is disclosed having a remote premises unit which is polled by the central station using FSK messages and reports its alarm information in DTMF (dual tone multifrequency) messages wherein a plurality of parallel bits of information is reported by the remote premises unit using a transmission comprising two tones, one tone selected from a group of high frequencies and one tone selected from a group of low fre- quencies, and said central station decoding the tone trans- mission into its bits of information. For example, if four low frequencies and four high frequencies are used at the remote premises, then the central station provides four out- put lines which are capable of completely describing the sixteen combinations of four parallel bits of information which can be constructed when selecting two tones for a dual tone multifrequency transmission, one tone selectable from a group of four low frequencies and one tone selectable from a group of four high frequencies.

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