Power cross detection using loop current and voltage

Details Power cross detection using loop current and voltage Power cross detection using loop current and voltage

1996-04-10

1997-06-17

Zele, Krista M.

Telephonic communications

Subscriber line or transmission line interface

Protective circuit

379377, 379382, 379463, H04M 124

Patent

active

056404514

ABSTRACT:
A power cross detection circuit that detects a power cross condition on the ring and tip lines of a telephone system. The power cross detection circuit senses a loop current flowing across a ring feed resistor, as well as a loop voltage at a first node and a second node at opposite ends of the ring feed resistor. Based on these sensed values, a threshold voltage for detecting a power cross condition can be adjusted to detect the power cross condition at a lower voltage value.

REFERENCES:
patent: 3996426 (1976-12-01), Lancaster
patent: 4079210 (1978-03-01), Sanderson
patent: 5038375 (1991-08-01), Sinberg
patent: 5402482 (1995-03-01), Minohara et al.
patent: 5406623 (1995-04-01), Rovik
patent: 5426695 (1995-06-01), Misu
patent: 5440612 (1995-08-01), Siligoni et al.

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