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Line restoration detection for security systems

  • US 5,828,978 A
  • Filed: 02/23/1996
  • Issued: 10/27/1998
  • Est. Priority Date: 02/23/1996
  • Status: Expired due to Term
First Claim
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1. A method of monitoring the connection between a monitoring center and a monitored premises comprisinga) providing a monitoring center,b) providing a plurality of monitored premises each having sensor means connected to an interface at said premises,c) providing a signaling point (SP) connected to said interface via digital data link means,d) providing interruption detection means at said SP to provide an interruption signal to identify any interruption of said data link means,e) providing processor means connected to said SP for receiving said interruption signal and for providing a trouble signal identifying said data link means in response to said interruption signal,f) transmitting said trouble signal from said processor means to said monitoring centerg) providing restoration detection means at said SP to provide a restoration signal to said processor to identify restoration of said data link means when said interface at said monitored premises signs-on to said SP, said sign on comprising receiving clocking information from said SP,h) transmitting said restoration signal from said processor means to said monitoring center.

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