Intrusion alarm cable supervision system

Details Intrusion alarm cable supervision system Intrusion alarm cable supervision system

1975-05-27

1977-06-28

Habecker, Thomas B.

Communications: electrical

Audible indication

Pneumatic-type sound producer

340152T, 340255, 340310R, 340408, G08B 2900

Patent

active

040329160

ABSTRACT:
A cable supervision system especially adapted for use in an intrusion alarm installation and which is capable of monitoring at a central control unit all lines of an interconnection cable for proper signal levels and balance. Under intended cable signal conditions a predetermined sensible impedance is provided which is monitored at the control unit. A monitoring circuit is coupled to the end of a system cable remote from the control unit, this circuit being operative to monitor the signal conditions of all lines of the cable. In response to proper signal conditions on the cable as determined by this monitoring circuit a predetermined impedance is provided which is sensed at the control unit to detect a change in impedance which would signal a tamper or cable failure alarm.

REFERENCES:
patent: 2817074 (1957-12-01), Faulkner
patent: 3252156 (1966-05-01), Muehter
patent: 3430231 (1969-02-01), Weld
patent: 3641547 (1972-02-01), Reiss et al.
patent: 3649873 (1972-03-01), Vlack
patent: 3653041 (1972-03-01), McGrath et al.
patent: 3702474 (1972-11-01), Fink et al.
patent: 3716834 (1973-02-01), Adams
patent: 3786501 (1974-01-01), Marnerakis
patent: 3828313 (1974-08-01), Schull et al.
patent: 3846793 (1974-11-01), Cook
patent: 3848241 (1974-11-01), LeNay et al.

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