The transmission windows of 1310 nm and 1550 nm are low loss windows. In DWDM systems, only the 1550nm transmission window is used. Which of the following is the main reason?

• A.The nonlinear effect in the 1550nm wavelength region is very small.
• B.The operating wavelength flatness area of EDFA is contained in this window.
• C.None of the above
• D.The 1550 nm wavelength region is suitable for long-distance transmission.

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Which of the following are the business board types of MSTP equipment? (Multiple choices)

• A.Interface board
• B.Service processing board with interface
• C.Service processing board
• D.Auxiliary board

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The reasons for the discrete business are? (Multiple choice)

• A.The cross-connection configuration on the network element is wrong.
• B.There is an outbound subnet service whose source or sink port is not within the scope of network management.
• C.The logical fiber connection of the network element is inconsistent with the physical fiber connection.
• D.The network element side configuration data is not uploaded to the U2000.

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Optical monitoring channel is used for monitoring of WDM optical transmission system. In the UU-T proposal, it is preferable to use a wavelength of 1510 nm at how much rate?

• A.192 kbit/s
• B.2 Mbit/s
• C.64 kbit/s
• D.576 kbit/s

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Which of the following statements about the Service Package is incorrect?

• A.Service package enables one-click configuration of typical services by issuing multiple configuration commands in batches, facilitating product deployment commissioning and reducing maintenance costs.
• B.You can configure service packages in two modes. One is to configure boards in batches, and the other is to configure each board.
• C.Currently, Service Package is available to the TOA, TOX and TSC boards.
• D.The Service Package can configure the working mode, service type, cross-connection, and port type in batches.

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