Device for directing a premises alarm panel to a backup radio network upon detection of use of the PSTN by another premises device
US6825762B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2002 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Apr 6, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/004
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.