Disconnect circuit for use between telephone switching systems

Details Disconnect circuit for use between telephone switching systems Disconnect circuit for use between telephone switching systems

1984-09-27

1987-02-24

Brown, Thomas W.

Telephonic communications

Call or terminal access alarm or control

Time out

379 32, H04M 312, H04M 714

Patent

active

046458808

ABSTRACT:
A disconnect circuit for use between two switching systems. An optical coupler monitors open and closed current loop conditions and provides signals representative thereof. Monostable multivibrators are operated in response to these signals to provide timing signals of predetermined durations. A relay circuit is controlled by these timing signals and it operates to disconnect the loop between the switching systems for a predetermined time.

REFERENCES:
patent: 3865993 (1975-02-01), Synek
patent: 4049919 (1977-09-01), Young
patent: 4058685 (1977-11-01), Bowin
patent: 4190745 (1980-02-01), Jusinskas, Jr. et al.

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