Ac supervisory signal detector circuit

Details Ac supervisory signal detector circuit Ac supervisory signal detector circuit

H - Electricity

04

M

379/57

H04M 7/00 (2006.01) H04Q 1/442 (2006.01)

Patent

CA 1111585

ABSTRACT OF THE DISCLOSURE An AC supervisory signal detector circuit for use in conjunction with a trunk circuit of a digital PABX telephone system interfacing with a central office providing for detection of relatively low frequency AC voltages which may be superimposed upon a DC bias voltage of either polarity. The circuit is equally responsive to various frequencies used in supervisory type signaling.

310945

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