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.