Calling signal transmission apparatus

Details Calling signal transmission apparatus Calling signal transmission apparatus

H - Electricity

04

M

379/16

H04M 3/02 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1240085

CALLING SIGNAL TRANSMISSION APPARATUS ABSTRACT OF THE DISCLOSURE In a calling signal transmitting apparatus, a ring trip equipment, comprising a ring trip detecting circuit for detecting a ring rip signal in response to an off-hook operation of the telephone set during a signal state of an intermittent ringing signal, a loop detecting circuit for detecting a loop signal in response to an off-hook operation of the telephone set during a nonsignal state of the intermittent ringing signal, a logical OR gate circuit, for providing, as a status signal, a logical sum of the ring trip signal and the loop signal, and a supervising circuit for supervising the status signal, wherein, under a state when an incoming call is being received by the telephone set, when the supervising circuit detects an off-hook state in the status signal, the supervising circuit stops the transmission of a ringing signal to the telephone set, and carries out a second supervising operation for supervising the status signal, and, if an on-hook state is detected during the second supervising operation, said supervising circuit again transfers the ringing signal to the telephone set.

482351

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