Cable tester

Details Cable tester Cable tester

2007-02-06

2007-02-06

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S534000

Reexamination Certificate

active

10997119

ABSTRACT:
A physical layer device communicates over a cable and includes a cable tester that determines a cable status, which includes an open status, a short status and a normal status. The cable tester includes a pretest module that senses activity on the cable and selectively enables testing based on the sensed activity. A test module is enabled by the pretest module, transmits a test pulse on the cable, measures a reflection amplitude, calculates a cable length, and determines the cable status based on the measured amplitude and the calculated cable length. A digital signal processor (DSP) communicates with the cable and that has a digital gain parameter. A cable length estimator communicates with the DSP and estimates cable length based on the digital gain parameter.

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