Mechanism for 1:1, 1+1, and UPSR path-switched protection switching
US6690644B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1999 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Feb 17, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A mechanism for 1:1, 1+1, and UPSR path-switched protection switching, particularly for optical interface units in synchronous optical network (SONET) multiplexer equipment. A working unit and a standby unit pair protect each other in the event of a failure of the working unit or the failure of the span connected to the working unit if both the working and standby units are connected to different spans. Each unit is made responsible for detecting failures of the span that it receives and is primarily responsible for detecting a fault within the unit's own hardware or software. When a unit or span failure is detected, switch control is localized to the two units (i.e. the working and standby unit) which eliminates the need for a third control unit, which reduces processing time and reduces the system hardware. Moreover, this feature allows distributed control of the system protection so that protection switching on multiple unit pairs can be performed in parallel rather than in a serial manner by a common control unit. Both unit and span failures are handled through the same signal pair and simple hardware.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.