The shortcomings of traditional OTDR meters in measuring optical fibers are: (Multiple choice)

• A.Manual interpretation is required, which requires high operator requirements
• B.Need inbound measurement
• C.Business will be interrupted during measurement
• D.Cannot be used for routine maintenance testing

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The following description of discrete services, which are correct? (Multiple choice)

• A.Discrete service management requires the U2000 license to have path management functions.
• B.Perform path search on the U2000 network management. Cross-connections that do not form a path are called discrete services.
• C.A service is searched for a discrete service, indicating that the service is not working properly on the network element side.
• D.For a cross-connection, after the path search, it is either a discrete service or a path with other cross-connections, it is impossible to belong to both high-spread services and other cross-connections to form a path.

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What are the basic principles of MSTP device fault location? (Multiple choice)

• A.Network first, then network element
• B.Low speed first, then high speed
• C.Advanced first, then low level
• D.External first, then transfer

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The user-oriented interface and the interface for the transport network of the E-Line service are
____ and _____.

• A.UNI, UNI
• B.NNI, UNI
• C.NN, NNI
• D.UNI, NNI

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When creating single station optical crossover, an error message "The direction of the cable is wrong selected" appears. The possible reason is?

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

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