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Method and apparatus for improving premises-line call availability in an alarm system

  • US 7,573,981 B2
  • Filed: 12/01/2005
  • Issued: 08/11/2009
  • Est. Priority Date: 01/10/2002
  • Status: Active Grant
First Claim
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1. In an alarm reporting apparatus for monitoring a premises for an alarm-condition and for reporting the alarm-condition to an alarm station, said alarm reporting apparatus comprising sensing means for sensing an alarm-condition, reporting means for reporting the alarm-condition to an alarm station via the PSTN, and seizing means for seizing control of the PSTN line at the premises and for disconnecting the premises-wiring from its connection to the PSTN line, the improvement comprising:

  • a signaling system operatively associated with said alarm reporting apparatus for generating signals to the premises-wiring for indicating the status of the connection of said alarm reporting apparatus to the PSTN;

    said signaling system comprising a voltage detector for detecting a voltage on the premises-wiring, and a PSTN simulator for supplying central-office functions to the premises-wiring when said voltage detector detects no voltage on said premises-wiring;

    said PSTN simulator for supplying central-office functions to the premises-wiring comprising a voltage generator for generating voltage to the premises-wiring when said voltage detector detects no voltage on the premises-wiring.

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