ODUk SNCP is classified into SNC/I, SNC/N, and SNC/S. The difference between the three protection schemes lies in that they have different monitoring capabilities and therefore have different trigger conditions.
ODUk SNCP (SNC/I) protects services against defects detected at the ODUk link connection (such as server layer trails and server/ODUk adaptation functions). It does not detect defects at the ODUk layer itself. Connections may be indirectly monitored by using the data that is inherently available from the server layer network.
The switching detection time (unit: 10 ms) described in the product documentation is used in cascading scenarios.
The SD enable status for protection determines whether protection switching is triggered when an SD condition is detected.
Fast SD protection switching is based on bit errors and implemented by setting the DEG detection time window (ms) of the SM overhead.
Generally, ODUk SNCP protection needs to be configured using one tributary board and two line boards to implement dual feeding and selective receiving of ODUk services in the OTN network.
ODUk SNCP uses the dual feeding and selective receiving function of electrical-layer cross-connections to protect services on line boards and OCh fibers.
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