Type of the FIU board to be configured when both the HBA and RAU boards are configured

In ultra-long span scenarios where both the HBA and RAU boards are configured, the span loss is large. In this case, the RAU board generally works in maximum gain mode. Therefore, gain control does not need to be performed. That is, the RAU board can be used without the TN14FIU or TN16FIU board. Therefore, the TN13FIU02 board must be configured in this scenario.

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