Automated restoration of unrestored link and nodal failures
US5862125A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L69/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for restoration of unrestored links and nodal failures utilizes a combination of link and path restoration schemes and most existing message types. This invention begins by using a link restoration scheme, when a fault is detected, to designate a pair of custodial sender and chooser. The conventional link restoration scheme then seeks to find an alternate route to reroute the disrupted traffic. When no alternate route is found after a given time period, a special signal is sent out to notify the network that a path restoration is to take place. The communications path on which the failure occurred is identified. Thereafter, data that was stored in the nodes is retrieved to identify the two ends nodes of the communications path. A restoration process then takes place to find alternate paths to replace the failed communications path. Upon termination of the path restoration scheme after a predetermined time period, the most efficient alternate path is selected to restore the traffic by bypassing the location on the communications path where the failure occurred. Since fault isolation is not required, the present invention can be used to restore traffic due to a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.