Method and apparatus for detecting and supplying power by a first network device to a second network device
US7552348B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2007 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Apr 2, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/547
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A first network device comprises first and second transformers that communicate with a second network device. A switch selectively connects power to the first and second transformers. A physical layer device communicates with the first and second transformers and includes a signal generator, a detector, and a controller that communicates with the switch, the signal generator and the detector. The signal generator generates a test signal comprising n sub-pulses, where n is an integer greater than 2. When the detector detects j pulses that are greater than a predetermined threshold, 1≦j<n, the controller supplies power to the second network device, where j is an integer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.