Whether the TN52NS2 board can function as the regeneration board of the TN53NQ2 board

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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.

Other related questions:
Whether TN53NQ2 can function as the regeneration board for TN11LSX, TN12LSX, and TN13LSX
When TN53NQ2 functions as a regeneration board, its Board Mode needs to be set to Electrical Relay Mode (in an OSN 8800 platform subrack or OSN 8800 UPS subrack) or Optical Relay Mode (in a subrack of another type). TN53NQ2 can be interconnected with TN13LSX. When TN53NQ2 is interconnected with a TN12LSX or TN11LSX board, its FEC Mode must be set to FEC.

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

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

Constraints on loopbacks of the TN53NQ2 board
A loopback on the TN53NQ2 board can apply only to service granularities received from the backplane side. For example, ODU0 granularities received from the backplane side can be looped back, but ODU1 granularities multiplexed from ODU0 granularities cannot be looped back on the TN53NQ2 board.

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