Automatic gain and return loss compensating line circuit

Details Automatic gain and return loss compensating line circuit Automatic gain and return loss compensating line circuit

H - Electricity

04

M

379/56

H04M 1/76 (2006.01) H04M 5/16 (2006.01)

Patent

CA 1101573

AN AUTOMATIC GAIN AND RETURN LOSS COMPENSATING LINE CIRCUIT Abstract The disclosed T-type line compensation circuit reduces the gain and return loss variations when customer equip- ment is connected to a central office or PBX over telephone lines of various lengths. A linear resistor of a first series leg is thermally coupled, as a heat source, to a positive temperature coefficient (PTC) resistor of a second series leg. The shunt leg consists of a series connection of a bilateral zener diode, linear resistor, and varistor. The resistance value of both the second series leg and the shunt leg of the line circuit vary automatically with the direct current in the line to minimize gain variation due to telephone line length variation. The thermal feedback to the PTC resistor varies automatically with the direct current in the line to minimize return loss variations seen by the customer equipment.

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