Mechanism for 1:1, 1+1, and UPSR path-switched protection switching

摘要: A mechanism for 1:1, 1+1, and UPSR path-switched protection switching, particularly optical interface units in synchronous network (SONET) multiplexer equipment. working unit a standby pair protect each other the event of failure or span connected to if both are different spans. Each is made responsible detecting failures that it receives primarily fault within unit's own hardware software. When detected, switch control localized two (i.e. unit) which eliminates need third unit, reduces processing time system hardware. Moreover, this feature allows distributed so switching on multiple pairs can be performed parallel rather than serial manner by common unit. Both handled through same signal simple