ocr: TWO-FIBER BIDIRECTTONAL LINE-SWITCHED RING Node A Active STSS Fiber #1 Stancoy STSS Node F Node 3 Fiber #2 STS1 STS-1 Node E Node C Node D Figure 1.Note that ench fiber in the two-fiber Fidirectional ine-switched ring carries both active (working) and standby protection) STSs. Standby STSS may contain low-priority services which wonid be preempted during "seij-healing" recovery situations.
