Whether TN53NQ2 can function as the regeneration board for TN11LSX, TN12LSX, and TN13LSX

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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.

Other related questions:
Whether TN11LSX and TN12LSX can be interconnected with TN53NQ2
TN53NQ2 can function as the regeneration board for TN11LSX and TN12LSX.To implement the interconnection, the FEC mode of TN53NQ2 must be set to FEC.

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 the TN12LSX and TN13LSX boards can be interconnected with each other
The TN12LSX board supports FEC or AFEC while the TN13LSX board supports FEC or AFEC-2. The TN12LSX board in AFEC mode cannot be interconnected with the TN13LSX board in AFEC-2 mode. The two boards can be interconnected only when the FEC types of the boards are both set to FEC. Alternatively, if the FEC working status of the board is disabled, the board can also be interconnected.

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

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