Patent ID: 7026825
Filing Date: 2006-04-11
Classification: G01R

Abstract:
1. A physical layer device that communicates over a cable, comprising: a cable tester that determines a cable status, which includes an open status, a short status and a normal status, wherein said cable tester includes: a first digital signal processor (DSP) that communicates with a first pair of the cable and that includes a first echo canceller having a finite impulse response (FIR) filter with taps and a first crosstalk canceller having a FIR filter with taps; and a second DSP that communicates with a second pair of the cable and that includes a second echo canceller having a FIR filter with taps and a second crosstalk canceller having a FIR filter with taps, wherein said cable tester calculates a distance to at least one of echo and crosstalk based on values of said taps of said first echo canceller and said second crosstalk canceller.