Which of the following are basic principles for locating a WDM system fault? (Choose all that apply.)

• A.You should check for external faults before internal faults.
• B.You should check networks before NEs.
• C.You should check bidirectional transmission before unidirectional transmission.
• D.You should check single-wavelength services before multi-wavelength services.

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When creating a single-site optical crossover, an error message "The direction of the fiber cable is selected wrongly" appears. The possible reason is?

• A.Device physical fiber connection error
• B."Create reverse crossover" was not selected during configuration
• C.The network management time of the NE is not synchronized
• D.Lack of logical fibers between boards

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In the OTUk frame structure, which of the following alarms are related to segment monitoring? (Multiple choice)

• A.OTUk_BDI
• B.OTUk_DEG
• C.OTUk_SM_DEG
• D.OTUK_SM_BDI

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Which of the following is not a northbound interface provided by U2000?

• A.CORBA
• B.XML
• C.SNMP
• D.Qx

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Please put the correct answer into the corresponding number position in the picture.

Correct Answer:

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