Telephone line status circuit

Details Telephone line status circuit Telephone line status circuit

H - Electricity

04

M

379/66

H04M 3/22 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1233924

ABSTRACT A circuit for detecting a first plurality of status signals on a multiplicity of telephone lines and generating a second lesser plurality of control signals, less than the first plurality, in response thereto. Predetermined ones of the control signals are transmitted via a multiplexing circuit to a comparator circuit. A digital-to-analog converter generates analog threshold voltages for application to the comparator circuit in response to receiving command signals from a microprocessor. The comparator circuit generates a third lesser plurality of output signals, less than the second plurality, indicative of the status of a multiplicity of remote trunk circuits connected to the telephone lines. The circuit is inexpensive and occupies little circuit board area.

483829

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