Lamp control circuit for key telephone systems

Details Lamp control circuit for key telephone systems Lamp control circuit for key telephone systems

1974-06-03

1976-02-10

Claffy, Kathleen H.

179 81R, H04M 121

Patent

active

039379019

ABSTRACT:
A circuit is provided for detecting the condition of a signalling output being applied by a line circuit to a key telephone and for responding to a predetermined condition of the line circuit. The detecting circuit provides a comparison with the signalling output to identify the signalling output and produce an indication based on the condition signalled by the output. The input to the lamp circuit comparator is compared for amplitude and wave form with a reference for passage of the output signal. With the circuit configuration disclosed, a large range of amplitudes may be used as a basis for comparison in a plurality of wave forms.

REFERENCES:
patent: 3246082 (1966-04-01), Levy
patent: 3395256 (1968-07-01), Limiero et al.
patent: 3794774 (1974-02-01), Kemmerly et al.

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