Device for directing a premises alarm panel to a backup radio network upon detection of use of the PSTN by another premises device
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United States of America Patent
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-
Nov 30, 2004
Grant Date -
Jul 31, 2003
app pub date -
Nov 25, 2002
filing date -
Jan 10, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A device for redirecting alarm-messaging from an alarm control panel from its connection to the PSTN to a backup radio transceiver for transmission of the alarm signaling to a central alarm station via a radio network. The switch-over to the radio network occurs not only when the PSTN line is down, for whatever reason, but also occurs when the PSTN line is already occupied by an existing transmission by a premises' telephones, in order to allow the user to make a call over the PSTN during such an alarm condition. Moreover, if during the time the alarm control panel is transmitting its alarm messages over the PSTN, a premises' telephone goes off-hook, the device of the invention terminates the alarm panel's connection to the PSTN and automatically switches over the alarm panel to the radio backup system.
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