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

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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.

Other related questions:
Types of fibers used to connect the HBA board
LSH/APC connectors and fibers are used on the OUT port of the HBA board, and LC connectors and fibers are used on the IN port of the HBA board.

FIU board isolation
Isolation refers to the ratio of the optical power leaked by local-frequency or RF signals to the input optical power, in the unit of dB. Isolation of a frequency mixer refers to the mutual isolation between frequency ports, including the isolation among local frequency, IF, and RF.

Insertion loss of the FIU board
The insertion loss of the IN-TM and RM-OUT ports on the FIU board is 1.5 dB, and that of the IN-TC and RC-OUT ports is 1 dB.

Optical ports of an FIU board
An FIU board has a total of seven optical ports. The IN/OUT optical port is used to receive and transmit line optical signals. The RC/TC optical port is used to receive and transmit optical signals of the main optical channel. The RM/TM optical port is used to receive and transmit optical signals of the supervisory channel. The MON optical port is used to output optical signals to the spectrum analyzer board for online optical performance monitoring.

Whether the HBA board can be used together with the SFIU board
No. The HBA board must be used together with the TN13FIU02 board.

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