Party line converter

Details Party line converter Party line converter

H - Electricity

04

M

379/14

H04M 3/02 (2006.01) H04M 1/70 (2006.01) H04M 19/04 (2006.01) H04M 19/08 (2006.01) H04Q 5/02 (2006.01)

Patent

CA 1308824

Canada TITLE: PARTY LINE CONVERTER INVENTORS: LEO TACHUK and MICHAEL K. TULLEY ABSTRACT A telephone subscriber interface device provides privacy on a party line. The device provides for revertive calling, break-in, automatic disconnect, selective ringing, automatic number identification, and operates on the central office power supply. The device provides the following features: A connect state for the PLC in which the PLC is connected to the telephone line but in which the PLC is not responsive to other inputs, a ring decoder which detects either divided coded ringing signals or divided ringing signals in a novel manner, means for testing whether a revertive call has been properly terminated, a low power switch so that the PLC can run on telephone line power only without battery backup, and means for resetting the PLC to a ready state in the absence of other inputs.

597339

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