Link technology detection in multiple speed physical links
US6600755B1 · kind B1 · utility
23Cited by
10References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1999 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Aug 3, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L49/351
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The invention concerns an improvement to an auto-negotiation process for a link between network devices and in particular the avoidance of ambiguity when signals at a higher rate, such as 100BASE-Tx scrambled idle signals, resemble signals at a lower rate, such as 10BASE-T link pulses. Analog and digital filtration is employed to identify 100BASE-Tx energy more accurately and a resultant indicating signal is used in conjunction with another signal characteristic of the higher rate signals, such as a descrambler lock signal, to ensure that the link is not established unless the bit error rate is reasonably low.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.