(The traditional SDH optical network is mainly designed for voice services, as shown in Figure 1-1. Its topological structure is mainly linear and ring. During service configuration, service paths and time slots need to be configured ring by ring and point by point, which is difficult to manage in real time, and the network topology varies. Changes cannot be reflected to the network management in real time. Although the protection methods terminated under these topologies have the advantage of fast protection switching, their network scalability is poor.)
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