Whether an ND2 board can be used as the regeneration board for the LSX board

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The WDM-side signals of the TN11LSX/TN12LSX board can be regenerated using another TN11LSXR board.
The WDM-side signals of the TN13LSX/TN14LSX board can be regenerated using the TN12ND2/TN52ND2/TN53ND2/TN57ND2/TN55NO2/TN55NH2/TN53NQ2/TN54NQ2/TN57NQ2 board.

Other related questions:
Whether regeneration is supported on ND2 boards
ND2 boards can regenerate one channel of OTU2/OTU2e signals in both directions.

Whether the TWC board can function as the regeneration board of the LDG board
The TWC board can function as the regeneration board of the LDG board.

Whether the TN52NS2 board can function as the regeneration board of the TN53NQ2 board
The WDM-side signals of the TN52NQ2, TN53NQ2, TN54NQ2, or TN57NQ2 board can be regenerated using the TN12ND2, TN52ND2, TN53ND2, TN57ND2, TN55NO2, TN55NH2, TN53NQ2, TN54NQ2, or TN57NQ2 board.

Whether a cross-connect board is required when ND2 is used to achieve electrical regeneration
The cross-connect board is not mandatory in this scenario. If the cross-connect board is configured, you can configure pass-through services to achieve electrical regeneration. If no cross-connect board is configured, you can configure ND2 in electrical regeneration mode to achieve regeneration of OTU2 and OTU2e signals.

Setting the wavelengths for ND2 boards
In the NE Explorer of the U2000, select the target ND2 board and choose Configuration > WDM Interface from the Function Tree to configure the wavelengths.

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