Joint-layer restoration in packet-over-optical networks
US7346277B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2004 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Jan 18, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0081
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A joint “packet-optical” layer restoration mechanism protects against single, packet-layer router failures by managing network resources from both the packet layer and the optical transport layer in a synergistic manner. It reuses packet-layer router service-ports and/or transport-layer service wavelengths associated with optical switch-ports instead of reserving additional standby packet-layer router service-ports. It can reuse resources from primary paths that are unaffected by router failures and paths that exist for link-failure protection at the optical layer. Embodiments feature a modified node structure that includes both an IP router and a dynamically reconfigurable OXC, which dynamically establishes connectivity between IP-router ports and transport-layer optical fibers. The joint-layer router provides fine-granularity grooming at the IP layer and full-fledged wavelength networking via dynamic wavelength switching and/or wavelength translation at the optical layer. The latter can change the wavelength cross-connections on-demand to perform restoration or to modify the connectivity between IP routers in the network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.