Telephone subscriber line circuit

Details Telephone subscriber line circuit Telephone subscriber line circuit

1977-01-05

1977-11-01

Robinson, Thomas A.

179 18FA, H04Q 130

Patent

active

040566897

ABSTRACT:
A communication line interface circuit including a floating current source supplying a constant current substantially independent of loop length is disclosed. The line interface circuit is provided with circuitry for line supervision and the detection of dial pulse signaling.

REFERENCES:
patent: 3522384 (1970-07-01), Ricketts et al.
patent: 3546564 (1970-12-01), Denny
patent: 3914556 (1975-10-01), Frazee
patent: 3955052 (1976-05-01), Orbach
patent: 4027235 (1977-05-01), Macrander et al.

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