Security system with backup dialer

Details Security system with backup dialer Security system with backup dialer

1991-01-11

1993-08-03

Dwyer, James L.

Telephonic communications

Emergency or alarm communications

Responsive to sensed nonsystem condition

379 42, H04M 1104

Patent

active

052336409

ABSTRACT:
A security apparatus having two control and communications units adapted to monitor a system and to establish communications over a connected telephone line and to transmit an alarm upon the occurance of a predetermined event in the system. The first control and communications unit produces a characteristic signal when it is operational; and the second control and communications unit is adapted to monitor the characteristic signal produced by the first control and communications unit and to establish communications over the connected telephone line and transmit an alarm upon interruption of the characteristic signal. The characteristic signal is preferably a tone of predetermined frequency.

REFERENCES:
patent: 4138670 (1979-02-01), Schneider et al.
patent: 4148020 (1979-04-01), Siemer
patent: 4278841 (1981-07-01), Regennitter et al.
patent: 4465904 (1984-08-01), Gottsegen et al.
patent: 4521643 (1985-06-01), Depuis et al.
patent: 4741022 (1988-04-01), Chebra et al.

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