Which of the following ROADN nodes are configured correct? (Multiple choice)

• A.WSMD9
• B.WSD9+RMU9
• C.WSM9+RDU9
• D.WSIM9+WSD9

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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.

• A.TRUE
• B.FALSE

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Which of the following paths are not related to the business?

• A.ODUk
• B.Client
• C.OCh
• D.OSC

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The network element automatically backs up the network element database to the FLASH database every 30 minutes by default.

• A.TRUE
• B.FALSE

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The following description of 1+1 and 1:1 optical line protection, the fault is (). (Multiple Choice)

• A.The main difference between 1:1 optical line protection and 1+1 optical line protection is whether the APS protocol is required.
• B.1:1 optical line protection switching mode can only be double-ended switching
• C.1+1 optical line protection and 1:1 optical line protection use the same protection board
• D.According to different placement of OLP boards in the network, 1+1 optical line protection can be divided into 1+1 OMS path protection and 1+1 OTS path protection.

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