System and method for measuring a cable resistance in a...

Details System and method for measuring a cable resistance in a... System and method for measuring a cable resistance in a...

2011-06-07

2011-06-07

Nguyen, Vincent Q (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S522000, C324S713000, C713S300000

Reexamination Certificate

active

07956616

ABSTRACT:
A system and method for measuring a cable resistance in a power over Ethernet (PoE) application. A short circuit module in a powered device is designed to produce a short circuit effect upon receipt of a cable resistance detection voltage. The cable resistance detection voltage can be designed to be greater than a voltage for detection or classification and less than a voltage for powering of the powered device. The measurement of the current at a time when a short circuit effect is produced at the powered device enables a calculation of the actual resistance of the cable on a given PoE port.

REFERENCES:
patent: 2006/0164108 (2006-07-01), Herbold
patent: 2007/0237322 (2007-10-01), Hussain et al.
patent: 2008/0144241 (2008-06-01), Crawley et al.

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