Subscriber line circuits using hall effect devices

Details Subscriber line circuits using hall effect devices Subscriber line circuits using hall effect devices

H - Electricity

04

M

379/16, 379/45

H04M 13/00 (2006.01) H04M 3/22 (2006.01) H04Q 3/00 (2006.01)

Patent

CA 1090495

Abstract of the Disclosure Telephone subscriber line circuits and an all-electronic telephone exchange are described wherein Hall effect devices are incorporated to detect line looping, dialing and ring-trip. The line circuit includes direct current feed means coupled via transformer w m dings, each of which windings are connect- ed between the direct current supply and one of a pair of line wires; an additional winding from the transformer through which an AC ringing current is applied to the line wires; a Hall effect device for detecting the presence of direct current in the line wires and a magnetic circuit coupled to the Hall effect device and to the transformer windings.

281781

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