System and method for measuring a cable resistance in a power over Ethernet application
US7956616B2 · kind B2 · utility
2Cited by
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11Claims
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Inventor
Key dates
| Filing date | Mar 29, 2010 |
| Grant date | Jun 7, 2011 |
| Priority date | — |
| Expiry date | Mar 29, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.