Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate
2000-12-29
2009-12-08
Jamal, Alexander (Department: 2614)
Telephonic communications
Subscriber line or transmission line interface
Power supply
C379S413010
Reexamination Certificate
active
07630490
ABSTRACT:
A method and apparatus is provided for DC feed control for a line card. The method includes determining if the line card is operating in a current limit region of a DC feed curve and synthesizing a curve in the current limit region. The method further includes determining a loop voltage based on the synthesized curve, and applying the loop voltage to the subscriber line. The apparatus includes logic capable of determining if the line card is operating in a current limit region of a DC feed curve and capable of determining a loop voltage based on a synthesized curve in the current limit region. The apparatus further includes circuitry for applying the loop voltage to the subscriber line.
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Li Jin
Miller Merle L.
Jamal Alexander
Williams Morgan & Amerson P.C.
Zarlink Semiconductor (U.S.) Inc.
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