Differences between SNC/I and SNC/N

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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.

Other related questions:
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.

Difference between SNC/N and SNC/S in the case of TCM monitoring
For TCM monitoring, SNC/N and SNC/S differ in termination and modification of overheads. SNC/N monitors PM and TCM sections, while SNC/S monitors only the TCM section. Moreover, SNC/S can isolate external faults to avoid protection switching triggered by external faults.

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.

What are the differences among N+0, N+1, and N+N backup modes of power modules
For CE series switches: In N+1 backup mode, N power modules provide power supply, and one power module acts as a backup. If one power module fails, the redundant power module provides power supply to ensure normal operations of the switch. In N+N backup mode, N power modules provide power supply, and N power modules act as backups. Even if all the N primary power modules fail, the N redundant power modules can still ensure normal operations of the switch. In N+0 mode, N power modules provide power supply, and no redundant power module is available. If one power module fails and the total output of the other power modules is smaller than the actual power consumption of the switch, the switch cannot run properly.

ODUk SNCP protection of the SNC/N type
ODUk SNCP (SNC/N) protects services against defects detected at the ODUk path (ODUkP) layer or ODUk TCM (ODUkT) sub-layers in E2E mode. It detects defects at the ODUk layer itself. The connection may be directly monitored by use of listen-only (non-intrusive) monitoring of the original characteristic information.

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