Power supply control circuit in subscriber's terminal for contro

Details Power supply control circuit in subscriber's terminal for contro Power supply control circuit in subscriber's terminal for contro

1985-12-16

1988-10-04

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

358 86, 455 6, H04N 716, H04N 710, H04H 102

Patent

active

047760109

ABSTRACT:
A subscriber's terminal is connected by a cable to a control unit, which is connected to a central station by a cable. The subscriber's terminal has a voltage supply source for supplying power to the control unit through the cable. The subscriber's terminal detects a communication carrier from the control unit by a demodulator. Based on the detection result, the presence/absence of an abnormality such as disconnection of the cable, malfunction of the control unit, etc. is detected so as to control a relay arranged along the cable between the voltage supply source and the control unit. When the abnormality occurs in the cable or the control unit, power supply to the control unit is stopped, thus preventing electric shock accidents and noise interference.

REFERENCES:
patent: 3303279 (1967-02-01), Tinklepaugh
patent: 3541453 (1970-11-01), Vandepoel et al.
patent: 3643167 (1972-02-01), Mayle
patent: 3811090 (1974-05-01), Uchida et al.
patent: 3839676 (1974-10-01), Linnecar
patent: 4161751 (1979-07-01), Ost
patent: 4173024 (1979-10-01), Miller
patent: 4241450 (1980-12-01), Blatter et al.
patent: 4348696 (1982-09-01), Beier
patent: 4447828 (1984-05-01), den Toonder
patent: 4467353 (1984-08-01), Citta et al.
patent: 4566033 (1986-01-01), Reidenouer

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