The OCh path is created using the single station method. After the creation is completed, the 0ch path is not searched. Which are the possible reasons? (Multiple choice)

• A.Line attenuation is too large
• B.errors in source and sink ports in the site
• C.Inconsistent wavelengths of the line boards at both ends of the source and sink
• D.Missing logical fiber between sites

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The steps that must be performed when configuring the Ethernet private line service carried by the PW are as follows: (Multiple Choice)

• A.Configure QoS
• B.Configure port DCN
• C.Configure MPLS tunnel
• D.Configure the UNI port

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Which of the following statements about replacing the SCC board is incorrect?

• A.If the software version of the new SCC board is later than equipment version, clear the database of the SCC board, and then downgrade the software on the SCC board to the same version as the equipment.
• B.If the software version of the new SCC board is earlier than the equipment version, upgrade the software on the SCC board to the same version as the equipment.
• C.In the case of the 1 + 1 hot backup of the SCC board, replacing the control board does not affect services when the active/standby switchover is performed.
• D.After the SCC board is removed, the BD_STATUS and COMMUN_FAIL alarms are reported. After the new board goes online, these alarms need to be manually cleared.

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Two PIU/APIU boards use the hot backup mode to supply power to the system on the OSN 1800 device, when a PIU/APIU board fails, the system can still work normally.

• A.TRUE
• B.FALSE

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Which of the following reasons does not cause optical power anomalies?

• A.Enable FEC function
• B.Equipment temperature is too high
• C.The pigtail is too large
• D.Pigtail connection error

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