Reason why the RAU1 or RAU2 boards must work with the TN14FIU board

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The TN14FIU board retains only C-band noises, so that the RAU1 or RAU2 boards perform gain control more precisely. The FIU boards connected to the SYS and IN ports on the RAU1 or RAU2 boards working in gain mode must be TN14FIU boards.

Other related questions:
TN12OBU1P1 boards must work only with the TN55NPO2/TN55NPO2E boards.
Only the PID boards of TN55NPO2/TN55NPO2E support the dedicated OA boards to eliminate the need for commissioning. All other PID boards, such as asynchronous PID and TN54NPO2, do not support the dedicated OA boards.

Reason why two unidirectional regeneration boards must be configured in paired slots
To implement ESC communication, the transmit-end and receive-end boards for the same wavelength must be configured in paired slots because overhead bytes are transmitted through the backplane buses between paired slots.

Reason why the working mode of the TN54NS4 and TN55NO2 boards cannot be specified on the NMS
The working mode can be specified only after the TN54NS4 or TN55NO2 board is added as 54NS4(REG) or 55NO2(REG) on the NMS.

Reason why the cross-connect board must be TN16UXCM when the TTX board is used in an OptiX OSN 8800 T16 subrack
The TTX board processes 10 x 10G signals and therefore requires a 100 Gbit/s cross-connect capacity on the backplane. An OptiX OSN 8800 T16 subrack supports the 100 Gbit/s cross-connect capacity in a single slot only when the TN16UXCM board is configured as the cross-connect board.

Reason why the laser on the RAU board cannot be turned on
The possible causes are as follows: 1. The fiber return loss exceeds the threshold. 2. The IPA is not configured. 3. When the network becomes faulty, IPA is triggered and the laser is shut down.

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