Telephone line status circuit

Details Telephone line status circuit Telephone line status circuit

1985-11-04

1988-03-29

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

Line status indication or call alerting

379377, 379382, 379384, 379 24, H04M 322

Patent

active

047349336

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.

REFERENCES:
patent: 4338495 (1982-07-01), Bloch et al.

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