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.

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