Whether cross-connections from ODU2 to ODU3 need to be configured when ODU0 services are configured on the NS3 board

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No, there is no need to configure the cross-connection. By default, the configurations are issued on the NMS.

Other related questions:
Whether the HUNQ2 board of OSN 1800 supports the ODU0 cross-connections
The HUNQ2 board supports ODU0 cross-connections, and can cooperate with cross-connect boards to implement grooming for 32 x ODU0 services.

Whether an HUNQ2 board on an OSN 1800 supports ODU0 cross-connections
An HUNQ2 board supports ODU0 cross-connections, and can work with cross-connect boards to implement the following service scheduling: 32 x ODU0/16 x ODU1/32 x ODUflex/4 x ODU2/4 x ODU2e

Whether one ODU0 service can be configured on the TN53ND2 board after two ODU0 services are deleted
1. If the ODU timeslot configuration mode is set to Assign random on the TN53ND2 board, one ODU1 service can be configured after two ODU0 services are deleted, which must be made on the TN53ND2 boards at both ends. Otherwise, services parsing fails, making services become unavailable. 2. If the ODU timeslot configuration mode is set to Assign consecutive on the TN53ND2 board, one ODU1 service cannot be configured after deleting two ODU0 services because there are mappings between ODU0 and ODU1 services.

Working mode of the TOA board when ODU0 services are configured on the board
When ODU0 services are configured, the working mode of the TOA board must be set to ODU0 non-convergence mode (Any -> ODU0).

Cross-connection level of the services on the TOM board
ODUk cross-connections are configured on the TOM board. For details about the service grooming mode in each scenario, see the multimedia in "Logical Ports" in the product documentation.

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