A, C are the WDM OTM stations, and B is the relay station.
When the transmission direction of the A to B stations is interrupted, the Wavelength side of the B-stack OTU relay board reports the R_LOS emergency alarm and runs the processing to the upstream A.
The station side OTU2_BDI secondary alarm. At the same time, the alarm continues to be transmitted to the downstream station of the B station. After the alarm is processed at the C site, the ODU2_PM_AIS minor alarm is reported on the WDM side of the C-site OTU, and the ODU2_PM_BDI secondary alarm is transmitted back to the upstream station A.

Which of the following methods can be used to analyze faults in the NG WDM system?

What are the ways that NG WDM devices create fibers? (Multiple Choice)

When creating a Client path using the path method, if the RL0S alarm is generated on the line card, the path cannot be created.

The basic principles of STP device fault location are? (Multiple choice)