Whether the VI port on the OBU board can report a LOS alarm

No, the VI port on the OBU board cannot report a LOS alarm.
When logical fibers are created on the NMS, if no FIU board is configured at the local site and the multiplexed-wavelength optical signals of the peer site need to be connected to the OBU board at the local site, you are advised to connect the logical fiber to the IN port of the OBU board. In this way, the corresponding logical fiber will turn red in case of a fiber cut.

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