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环形光传输网络解决方案
OTN ring network solution
OTN环网解决方案由DWDM或CWDM设备组成，站点A和B直接相连，完成业务传输，且设备间形成环路，
提供环路交换保护。如果站点A和B之间的链路出现故障，则站点A和B之间的通信将通过站点C来完成。
The OTN ring network solution consists of DWDM or CWDM devices.
Sites A and B are directly connected to complete service transmission,
and loops are formed between devices to provide loop switching protection.
If the link between sites A and B fails, communication between sites A and B will be done through site C.
