Cable tester
US7026825B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2005 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | May 13, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A physical layer device includes a cable tester that determines a cable status. A test module transmits a test pulse on the cable, measures reflection amplitude, calculates a cable length, and determines the cable status based on the measured amplitude and the calculated cable length. A first digital signal processor (DSP) communicates with a first pair of the cable and 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. A second DSP communicates with a second pair of the cable and includes a second echo canceller having a FIR filter with taps and a second crosstalk canceller having a FIR filter with taps. The cable tester calculates a distance to at least one of echo and crosstalk based on values of the taps of the first echo canceller and the second crosstalk canceller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.