Differences between SNC/I and SNC/N

SNC/I means inherent monitoring and protects services carried over ODUk links (for example, server-layer trail and server/ODUk adaptation). It does not detect faults at the ODUk layer. Connections are monitored by using the inherent data available from the server layer network.
SNC/N means non-intrusive monitoring and protects services at the ODUk path (ODUkP) layer or ODUk TCM (ODUkT) sub-layers. It defects faults at the ODUk layer. Connections are monitored by non-intrusive monitoring of the original characteristic information.

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