Interoffice loop supervision arrangement

Details Interoffice loop supervision arrangement Interoffice loop supervision arrangement

1976-11-19

1977-11-15

Cooper, William C.

H04M 700

Patent

active

040586855

ABSTRACT:
An arrangement for preventing false reseizures of loop-signaling, repeat coil-coupled interoffice trunk circuits for telephone switching systems is disclosed. In the prior art, false reseizures of an incoming trunk circuit can be caused by discharge of the midpoint capacitor at the facility side of the repeat coil bridge of an associated outgoing trunk circuit at the opposite terminus of the interoffice trunk facility. During the talk state, this midpoint capacitor is charged approximately to the signaling battery supply level with polarity such that, upon termination of the talk state and accompanying tip-ring reversal, the capacitive discharge is sufficient to re-operate the supervisory relay in the distant office incoming trunk circuit, thereby generating a false reseizure attempt. By placing said midpoint capacitor within a diode bridge at the outgoing trunk circuit, the charge built up thereon is prevented from assuming a polarity necessary to initiate such false reseizures while simultaneously allowing for normal operation of said outgoing trunk circuit.

REFERENCES:
patent: 3391252 (1968-07-01), Germanton

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