Subscriber's set

Details Subscriber's set Subscriber's set

H - Electricity

04

M

379/67

H04M 7/00 (2006.01) G01R 19/15 (2006.01)

Patent

CA 1189208

ABSTRACT: A line looping circuit which is connected between the wires of a subscriber's line via the hook contact and in parallel with further equipment of a subscriber's set. The circuit comprises the series arrangement of the main current path of a field effect transistor and a resistor, the gate of the field effect transistor being connected to the remote end of the resistor. The circuit has a low resistance for small currents, i.e. low positive voltage between two terminals and a high resistance to high cur- rents, i.e. high positive voltage between the terminals. Further embodiments are described which are not sensitive to the polarity of the voltage between the subscriber's wires.

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