Security system with two signal reporting

Details Security system with two signal reporting Security system with two signal reporting

1997-04-22

1999-09-21

Chan, Wing F.

Telephonic communications

Emergency or alarm communications

Responsive to sensed nonsystem condition

379 45, 379 50, H04M 1104

Patent

active

059563885

ABSTRACT:
A security system having two distinct channels of communication and which uses a single communication device provides improved security. The system monitors a host of security alarm panels connected to a telephone system. A status signal is communicated between each control panel and a scanner placed at a switching station of the telephone system to confirm the integrity of the communication channel. An alarm event continues to be reported to a monitoring station using the telephone system in the normal manner.

REFERENCES:
patent: 4097696 (1978-06-01), Tal
patent: 4442320 (1984-04-01), James et al.
patent: 4903292 (1990-02-01), Dillon
patent: 4937851 (1990-06-01), Lynch et al.
patent: 5465297 (1995-11-01), Azem
patent: 5822423 (1998-10-01), Jehnert et al.

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