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

H - Electricity

04

M

344/24

H04M 3/12 (2006.01) H04M 7/00 (2006.01) H04M 7/14 (2006.01)

Patent

CA 1233898

TITLE DISCONNECT CIRCUIT FOR USE BETWEEN TELEPHONE SWITCHING SYSTEMS ABSTRACT OF THE DISCLOSURE 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.

470966

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