Optical ring protection having matched nodes and alternate secondary path
US6400859B1 · kind B1 · utility
20Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1999 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Jun 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0291
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The matched nodes provide protection for a failure in the connection between two bidirectional line switched rings. They use a secondary path in case of a primary path failure. The secondary path is set aside in either the working or protection bandwidth of the rings, thus wasting resources. The invention uses a dedicated secondary path between the primary and secondary nodes. With the invention, no ring protection mechanisms are compromised and the ring bandwidth is not wasted. Middle nodes also realize full add/drop capabilities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.