Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Reexamination Certificate
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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Guo Yiqing
He Runsheng
Janofsky Eric
Leung Tsin-Ho
Lo William
Dole Timothy J.
Hirshfeld Andrew H.
Marvell International Ltd.
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