1980-03-18
1983-06-28
Popek, Joseph A.
179 2A, H04M 1104
Patent
active
043907504
ABSTRACT:
A remote supervisory system operating in conjunction with a telephone company central office to enable monitoring of a subscriber's premises over existing telephone circuits. Auxiliary equipment at the subscriber's premises is coupled to the subscriber's telephone circuit and includes sensors which monitor the condition of the premises. If an abnormal condition occurs at the premises, the condition is sensed by one of the sensors and the equipment, in response thereto, creates a temporary off-hook condition on the circuit, transmits to the central office alarm report signals indicative of the abnormality, and then goes back on-hook. The central office identifies the subscriber as it does in the case of a normal outgoing call, senses the transmitted alarm report signals and stores the signals and subscriber's identity in its memory. The central office may be equipped to initiate a call to a predesignated action center to report the subscriber's identity and nature of the alarm. The auxiliary equipment may also be adapted to report periodically to the central office rather than only in the case of abnormality, and may include command receivers and a recording unit which receive commands and messages over the circuit.
REFERENCES:
patent: 3299211 (1967-01-01), Avery et al.
patent: 3492426 (1970-01-01), Foreman et al.
patent: 3700823 (1972-10-01), Chwlak
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