Loop-start/ground-start line interface circuit

Details Loop-start/ground-start line interface circuit Loop-start/ground-start line interface circuit

H - Electricity

04

M

379/66

H04M 7/00 (2006.01) H04M 3/22 (2006.01)

Patent

CA 1202742

- 36 - LOOP-START/GROUND-START LINE INTERFACE CIRCUIT Abstract A switchable common mode reference circuit for tip conductor and ring conductor line feed amplifiers provides a tip-ring common mode feedback reference for loop-start operations and a common mode fixed bias for ground-start operations. The functioning of the line feed arrangement is enhanced by using separately-sensed tip and ring current signals to control the switching function and by switching the line feed amplifiers between a current source mode for loop-start operation and a voltage source mode for ground-start operation.

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