Robust cable connectivity test receiver for high-speed data...

Details Robust cable connectivity test receiver for high-speed data... Robust cable connectivity test receiver for high-speed data...

2007-06-21

2010-12-21

Dole, Timothy J (Department: 2831)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S500000, C375S224000

Reexamination Certificate

active

07855563

ABSTRACT:
A system is provided for detecting a fault in a signal transmission path. In one embodiment, the system can include a variable amplitude signal attenuator which is operable to modify an input signal by variably attenuating a signal voltage swing of the input signal. Desirably, the input signal is attenuated only when transitioning from a high signal voltage level towards a low signal voltage level d variably, such that a larger high-to-low signal voltage swing is attenuated more than a smaller high-to-low signal voltage swing. Desirably, a comparator, which may apply hysteresis to the output signals, may detect a crossing of a reference voltage level by the modified input signal. In this way, when the comparator does not detect an expected crossing of the reference voltage level by the modified input signal, a determination can be made that a fault exists in the signal transmission path.

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Office Action U.S. Appl. No. 11/985,956, filed Nov. 19, 2007.

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