Patent ID: 6867600
Filing Date: 2005-03-15
Classification: G01R

Abstract:
1. An electronic circuit for testing a subscriber line comprising: a signal generator comprising a pseudo-random bit series (PRBS) generator for generating a spread spectrum test signal; a coupler for coupling the signal generator to the line, for transmitting test signal on said line, and for receiving a reflected signal generated on said line when said test signal is transmitted; and an evaluating unit connected to said coupler for receiving from said coupler the reflected signal, said evaluating unit comprising: an adjustable delay unit for adjustably delaying said test signal; a digital to analog (D/A) converter for converting said delay test signal into an analog delayed test signal; a mixer for multiplying the delayed analog test signal with the reflected signal; an integrator for integrating the output signal of said mixer in order to generate a correlation function of said test signal and said reflected signal; and a processor for receiving and evaluating the generated correlation function.