At the ROADM station consisting of the OptiX OSN 6800 V1R2, the signal flow in the wavelength add direction is as follows: L4G->M40V->WSM9->OAU->FIU. After the internal logical fiber connections are complete at the NE, create the single-station optical cross-connections and select the automatic optical power adjustment function. Then, the T2000 prompts that the creation is successful. The OAU board, however, reports the MUT_LOS alarm. No alarm is generated on other boards.