Patent ID: 7786737
Filing Date: 2010-08-31
Classification: G01R,H04B

Abstract:
1. A method of calibrating a DSL transceiver front-end for operation as a TDR system, the method comprising: connecting a first predetermined impedance to the DSL transceiver front-end; transmitting a first waveform and receiving a first echo response of the first waveform in the DSL transceiver; connecting a second predetermined impedance to the DSL transceiver front-end; transmitting a second waveform and receiving a second echo response of the second waveform in the DSL transceiver; connecting a third predetermined impedance to the DSL transceiver front-end; transmitting a third waveform and receiving a third echo response of the third waveform in the DSL transceiver; determining three independent parameters that characterize the DSL transceiver front-end; connecting the DSL transceiver to a transmission line; and determining a length of the transmission line using the three independent parameters.