A VOA is configured on each wavelength path of a WSS board to adjust the____of optical signals to achieve flatness adjustment. (Enter only lowercase letters.)

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When the GE service is encapsulated into the OTN frame structure and the SDH frame structure, the alarms reported by the client-side device are different.

• A.False
• B.True

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Which of the following description of the 100G mixed transmission system is wrong?

• A.40G DQPSK and coherent signals will not affect each other without isolation band
• B.Coherent and non-coherent signals (10G and 40G ODB will affect each other, resulting in a sharp drop in performance, and isolation bands are necessary)
• C.The cost of mixed transmission is related to the number of transmission spans and the width of the isolation bandwidth, and has nothing to do with the FEC encoding method
• D.10G starts from a short wavelength, and the isolation band can be filled with 40G DQPSK wavelength

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There is a slot mapping relationship between the OSN3500 processing board and the interface board. The processing board in slot 1 maps to the interface boards in slots 19-20.

• A.True
• B.False

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Which of the following measures can be taken when the low-level resources of the device are insufficient? (Multiple choice)

• A.Configure the VC4 server path
• B.Configure VC4 service
• C.Use cross-connect boards with larger low-order cross-connect capacity
• D.Combining available low-level resources

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