Method and apparatus for improving premises-line call...

Details Method and apparatus for improving premises-line call... Method and apparatus for improving premises-line call...

2005-12-01

2009-08-11

Ramakrishnaiah, Melur (Department: 2614)

Telephonic communications

Emergency or alarm communications

C379S042000, C379S045000

Reexamination Certificate

active

07573981

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.

REFERENCES:
patent: 4718079 (1988-01-01), Rabito
patent: 4821312 (1989-04-01), Horton et al.
patent: 5131019 (1992-07-01), Sheffer et al.
patent: 5187736 (1993-02-01), Morizumi
patent: 5748706 (1998-05-01), Morgan et al.
patent: 6226357 (2001-05-01), Pildner
patent: 6366647 (2002-04-01), Webb

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