Which of the following is a function of the TCM overhead in the ODUk signal?

• A.Tandem Connection Monitoring Overhead
• B.Path tracing identifier overhead
• C.General communication channel overhead
• D.Channel Monitoring Fee

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Which of the following description of equipment operation is wrong?

• A.Equipment requires a safety ground
• B.CLASS 1M means that the light power is low and will not cause damage to eyes or skin
• C.You need to wear anti-static wrist or gloves during operation to avoid damage to the board caused by static electricity
• D.It is necessary to regularly clean the dust filter to facilitate heat dissipation

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RDU9 can realize the dynamic and configurable demultiplexing function from any wavelength to any port.

• A.True
• B.False

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The instruments commonly used in the daily maintenance and troubleshooting of MSTP equipment are? (Multiple choice)

• A.Fixed light attenuation
• B.Bit Error Tester
• C.Optical power meter
• D.Multimeter

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Which of the following options are included in the advantages of WDM? (Multiple choice)

• A.Can fully replace SDH equipment
• B.Large capacity, "transparent" transmission of data
• C.The system is easy to upgrade, and the existing investment can be protected to the greatest extent during the upgrade
• D.Compatible with future all-optical switching networks

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