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

H04M 3/02 (2006.01) H04M 1/00 (2006.01) H04Q 1/30 (2006.01)

Patent

CA 1036731

STATION LOOP CONTROL ARRANGEMENT FOR TELEPHONE SWITCHING SYSTEM ABSTRACT The present invention relates to a telephone line circuit. The circuit comprises a line relay, a pair of tip and ring conductors for connecting the line relay to a telephone set and a ringing control relay having a set of transfer contacts. The transfer contacts include a make contact for normally applying ringing current to one of the pair of tip and ring conductors and a back contact for disconnecting the ringing current from the line relay. An operating unit is provided for operating the line relay during a predetermined interval of time when ringing current is not applied to the make contact.

291879

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