Patent ID: 6477212
Filing Date: 2002-11-05
Classification: H04L

Abstract:
An apparatus for canceling interference coupled into a twisted wire pair of a transmission system connecting a central office to a customer premises, the apparatus comprising:a receiver coupled to first ends of the twisted wire pair, the receiver receiving an electrical signal being propagated along the twisted wire pair; a detector disposed to detect the interference coupled into the twisted wire pair, the detector generating a signal relating to the detected interference, wherein the interference is generated by a source external to the transmission system; a sampling/scaling device coupled to the detector, the sampling/scaling device receiving the signal generated by the detector and sampling and scaling the signal to produce an interference cancellation signal; an adder device coupled to the receiver and to the sampling/scaling device, the adder device receiving a first input signal from the receiver, the first input signal relating to the signal received by the receiver from the twisted pair, the adder device receiving a second input signal, the second input signal relating to the interference cancellation signal produced by the sampling/scaling device, the adder device combining the first and second input signals to eliminate or reduce interference contained in the first input signal, wherein the apparatus is located at one end of the twisted wire pair.