Patent ID: 7424097
Filing Date: 2008-09-09
Classification: H04B,H04M

Abstract:
1. A method of improving a transmission characteristic of an xDSL system that implements high-speed data communication over existing copper telephone line wires connecting a telephone office and a subscriber, comprising the steps of: using a testing system installed in a telephone office proximate a main distribution frame polls, before connection of a subscriber telephone line to said xDSL system, said subscriber telephone line at an outside line of an xDSL circuit, to measure a cross-talk noise characteristic of said subscriber telephone line only within an xDSL transmission frequency band, and if said cross-talk noise characteristic is of high level, preventing said subscriber telephone line from being connected to said xDSL circuit, wherein the measured cross-talk characteristic is cross-talk existing on the subscriber telephone line due to interference from other subscriber telephone lines within the xDSL transmission frequency band.