Security terminal for use with two-way interactive cable system

Details Security terminal for use with two-way interactive cable system Security terminal for use with two-way interactive cable system

1980-08-29

1982-11-30

Popek, Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 5, H04M 1104

Patent

active

043617301

ABSTRACT:
A security terminal for use with a two-way interactive cable system. The security terminal develops alarm and supervisory signals, and controls their transmission over the cable when polled by a central station. The terminal discriminates between four different types of alarm condition (burglary, fire, medical and general emergency), and transmits respective coded signals over the cable, or over a switched telephone network if cable transmission is not successful. To further insure that alarm signals are properly transmitted in the event of a cable outage, the terminal responds to a cable-sent test command from the central station by causing the dialer to dial the central station over the switched telephone network; in this way, the dialer mechanism can be tested periodically to insure that it will be operative if needed.

REFERENCES:
patent: 4057829 (1977-11-01), Moorehead
patent: 4119815 (1978-10-01), Frankfort et al.

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