Integrated ring sensor with fault detection

Details Integrated ring sensor with fault detection Integrated ring sensor with fault detection

1995-06-01

1998-09-15

Kuntz, Curtis A.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

379 26, 379412, 379 34, 379377, H04M 124

Patent

active

058091092

ABSTRACT:
A power cross circuit detects a ring trip condition in order to switch a pair of switch relays to a protection circuit and to appropriate line driver circuitry to enable a talking condition for a telephone. The power cross circuit detects a rise in a DC current across a feed resistor connected to a ring bus and a ring line. The power cross circuit determines a difference in current passing across a first and second sense amplifier connected to respective ends of the feed resistor. The current difference is then converted to a voltage difference, and utilized by the power cross circuit to output a power cross condition when the current difference exceeds a predetermined value.

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