Telephonic communications – Emergency or alarm communications – Central station with plural substations
Patent
1985-05-03
1987-11-10
George, Keith E.
Telephonic communications
Emergency or alarm communications
Central station with plural substations
379 2, 379 27, 379 39, 379 50, 379104, 379105, 340510, 34082505, 340292, H04M 1104, H04M 312
Patent
active
047062711
ABSTRACT:
Apparatus for connecting in series a plurality of communication line pairs, typically direct connected security loops used by alarm companies for monitoring customer's facilities. A bridge with pairs of bridge terminals and switches for connecting bridge terminal pairs to communication line pairs or to terminating lines. Local and remote control for the switches and control apparatus which permits service personnel to selectively terminate a bridge terminal pair with a direct or zero resistance connection line and leave a subscriber's communication line open, for maintaining service for other communication lines connected to the bridge while performing maintenance on the disconnected line. The apparatus is suitable for bridges with various numbers of terminals, such as six way, eight way and twelve way.
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Hilligoss Lawrence O.
Hilligoss William R.
Communications Technology Corporation
George Keith E.
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