Station loop control arrangement for telephone switching system

Details Station loop control arrangement for telephone switching system Station loop control arrangement for telephone switching system

H - Electricity

04

M

379/15, 344/25,

H04M 3/02 (2006.01) H04M 1/00 (2006.01) H04M 9/00 (2006.01) H04Q 1/30 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1036730

STATION LOOP CONTROL ARRANGEMENT FOR TELEPHONE SWITCHING SYSTEM Abstract of the Disclosure An arrangement for controlling the d.c. state of a subscriber's loop which has a port appearance in a time division switching network is disclosed. Because such a network provides no metallic path between the subscriber's line port and the trunk circuit, the abandonment of the call by the trunk circuit must be detected by a trunk scanner rather than by the line circuit directly and conventionally, a processor operation being required to interpret the scanner information. Heretofore a complex subscriber line circuit would have been required to respond to the processor operation so as to inform the station user that the call has been remotely abandoned. The present arrangement allows the processor to reoperate the ringing relay in the subscri- ber's line circuit during an interval when the group of line circuits including that of the affected subscriber would not normally receive active ringing. The ringing relay is equipped with back contacts that disconnect the subscriber's telephone set from the remainder of his loop circuit allowing the holding bridge in the subscriber's loop to be released and allowing the line scanner to inform the processor that the line is "on-hook". If the subscriber maintains the set off-hook when the ringing relay is released, the processor may properly return dial tone and respond to subsequent call signaling from the subscriber set.

238198

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