Digital supervisory circuit for a telephone system

Details Digital supervisory circuit for a telephone system Digital supervisory circuit for a telephone system

H - Electricity

04

M

379/16

H04M 3/02 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1190678

Abstract of the Disclosure The digital supervisory circuit comprises an amplitude comparator and EXCLUSIVE-OR gate to provide an output signal indicating the difference in time an input signal is above and below a predetermined reference potential. This output signal is integrated in an up-down binary counter and also is coupled to a first logic circuit under control of the counter which provides a ring present supervisory signal when a first threshold is exceeded and a second logic circuit under control of the counter which provides a switch hook detection supervisory signal when a second threshold is exceeded. A hit-timing circuit is provided coupled to the counter and the first and second logic circuits to prevent response of the counter and second logic circuit to line transients.

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