Loop detecting circuit

Details Loop detecting circuit Loop detecting circuit

H - Electricity

04

M

379/57

H04M 3/22 (2006.01)

Patent

CA 1160778

ABSTRACT OF THE DISCLOSURE A circuit for detecting a closed loop formed by actuation of a telephone set, the loop being indicative of a connection between the telephone set and an exchange through a ring line and a tip line. The detecting circuit comprises generators for generating first and second detection signals having amplitudes proportional to a ring line current and a tip line current respectively, summing circuit for summing the detection signals and a comparator for comparing the outputs of the summing circuit and a reference value and delivering an output depending upon the result of comparison.

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