WDM ring transmission system having two hubs
US6426815B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1998 |
| Grant date | Jul 30, 2002 |
| Priority date | — |
| Expiry date | Jun 19, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0297
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A WDM ring transmission system is provided having two hubs. Identical groups of optical signals for transmission along the ring are input to both hubs, but one of the hubs includes optical switches for selectively passing one of the groups of optical signals to the WDM ring. Accordingly, if a fault occurs in one of the network-hub connections or one of the hubs becomes defective, the switches couple optical signals from the operational hub to the WDM ring. In addition, optical signals emitted by nodes coupled to the WDM ring are output from both hubs, thereby insuring that signals can be output from, and input to, the ring even if one of the hubs fails.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.