Cause why a TOM board on an ASON trail that is equipped with tributary SNCP protection does not support tributary SNCP protection

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To create tributary SNCP protection, you need to first set the service mode and port working mode for tributary boards. Please check whether the service mode and port working mode have been configured for the TOM board.

Other related questions:
Selection of the SNCP protection type during configuration of the ODUk SNCP protection on TOM boards
1. SNC/I: SNC protection for inherent monitoring (1) Description: This method protects services (for example, server-layer trails and server/ODUk adaptation) against defects detected on the ODUk link. No defect detection is performed at the ODUk layer itself. Connections are indirectly monitored by using the data that is inherently available from the server-layer network. (2) Application scenario: a. The subnet that ODUk signals traverse does not have an electrical regeneration site. b. The tributary boards can receive any client-side services. 2. SNC/N: SNC protection for non-intrusive monitoring (1). Description: This method protects services against defects detected at the E2E ODUk path (ODUkP) layer or ODUk TCM (ODUkT) sub-layers. Defect detection is performed at the ODUk layer itself. The connections are directly monitored by use of listen-only (non-intrusive) monitoring of the original characteristic information. (2) Application scenario: a. No limit is set on the type of sites in the subnet where ODUk signals traverse. b. In case of SNC/N (PM), it is recommended that tributary boards receive non-OTN services. In case of SNC/N (TCM), tributary boards can receive any client-side services. 3. SNC/S: SNC protection for sub-layer monitoring (1) Description: This method protects services against defects detected at the TCM sub-layer (ODUkT) of the ODUk protection. Switching can be triggered only by defects of the protected domain. An ODUk fault cannot trigger protection switching. (2) Application scenario: a. No limit is set on the type of sites in the subnet where ODUk signals traverse. b. Tributary boards can receive any client-side services.

Principles of ODUk SNCP protection
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.

Method used to change the protection type from SNCP/I to SNCP/N
Conversion between SNCP protection types is not allowed. You need to convert the SNCP service into a common service, and convert the common service into the desired type of SNCP service.

Switching time of ODUk SNCP protection
The switching time of ODUk SNCP protection cannot exceed 50 ms, excluding the detection time.

ODUk SNCP protection switching conditions
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.

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