Additional line coupling circuit to an intercom telephone set

Details Additional line coupling circuit to an intercom telephone set Additional line coupling circuit to an intercom telephone set

H - Electricity

04

M

379/87

H04M 9/02 (2006.01) H04M 7/06 (2006.01) H04M 9/00 (2006.01)

Patent

CA 1195019

ABSTRACT OF THE DISCLOSURE: The present invention relates to an additional line (signalling line) coupling circuit for an intercom telephone set. The coupling circuit of the invention includes, inserted between the additional line and the intercom tele- phone set, a d.c. line uncoupling circuit as well as a coupler connected to one of the wires of the additional line for transmitting signals on this additional line, and a coupler connected to the one or the other of the additional line wires for receiving the signals transmitted on this additional line. The invention is applicable in private telephone installations.

432195

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