Method and apparatus for detection of warning system breach

Details Method and apparatus for detection of warning system breach Method and apparatus for detection of warning system breach

2005-01-18

2005-01-18

Nguyen, Phung T (Department: 2632)

Communications: electrical

Systems

Manual alarm telegraph; e.g., other than signal box type

C340S005300, C340S010520, C340S500000

Reexamination Certificate

active

06844808

ABSTRACT:
Base stations in an outdoor warning siren system monitor the system communication radio frequency to detect the command signals used to activate remotely located warning units. A valid command signal includes a portion identifying the base station generating the signal. When a base station detects a signal bearing its identification, the base station compares the detected signal to its own station ID. If the detected signal matches the detecting station's ID then a system breach is declared. The outdoor warning siren system may respond to a breach by automatically de-activating any alarms activated by the unauthorized signal and/or producing a breach indication to emergency personnel who may respond according to the situation.

REFERENCES:
patent: 4229734 (1980-10-01), Schultz
patent: 5282250 (1994-01-01), Dent et al.
patent: 5875395 (1999-02-01), Holmes

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