Method and apparatus for improving premises-line call availability in an alarm system
US7573981B2 · kind B2 · utility
0Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2005 |
| Grant date | Aug 11, 2009 |
| Priority date | — |
| Expiry date | Sep 20, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/2854
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
When an alarm panel needs to transmit alarm data, it seizes the PSTN and disconnects the premises-wiring. If in a call, the user is cut off immediately and it appears to the user that the connection to the PSTN has been lost. If trying to place a call, the user also perceives that the connection to the PSTN is lost. The present invention provides tonal signals to the user to indicate that the PSTN line is in use by the alarm panel and also notifies the user when the PSTN connection is available for use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.