Ac supervisory signal detector

Details Ac supervisory signal detector Ac supervisory signal detector

H - Electricity

04

M

379/58

H04M 3/22 (2006.01) H04M 7/00 (2006.01)

Patent

CA 1160779

TITLE AC SUPERVISORY SIGNAL DETECTOR CIRCUIT ABSTRACT OF THE DISCLOSURE An AC supervisory signal detector circuit for use in conjunction with a trunk circuit of a PABX telephone system connected to a telephone central office. Valid AC supervisory signals are detected to the exclusion of noise signals and response time for detection of termination of AC supervisory signals is improved.

376592

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