In a scenario where non-convergence OTU boards process standard SDH signals, both site A and site B are WDM sites, and the R_LOS alarm is detected on the client side of the OTU board at site A. After an alarm is processed on the WDM side of the OTU board, the REM_5F alarm is reported on the client side of the downstream site B. Then, site B transmits the signals to its downstream client device and reports the R^LOS alarm to the client device.
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