During the process of maintaining the OSN device, it is often seen that the fan runs at full speed, and the device reports the TEMP_OVER alarm. What are the common causes and treatment methods?

• A.The power module of the board is heavily dusty, affecting heat dissipation, and needs to be removed.
• B.The optical module has an abnormal cooling function and needs to be replaced with a light board.
• C.The dust inside the fan is serious, which affects the speed. You need to remove the fan to remove it.
• D.The dust filter is heavily dusty and affects ventilation. The dust filter needs to be cleaned.

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The ways of synchronize alarms are (). (Multiple Choice)

• A.Automatic synchronization
• B.Timing synchronization
• C.Manual synchronization

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Which of the following description of the evolutionist in the mainstream SDN model in the industry is correct? (Multiple Choice)

• A.Make full use of existing equipment and achieve fast
• B.Try to preserve and reuse existing routing protocols and IP network technologies
• C.Device programmable, open northbound API interface
• D.Control flexibility is moderate and open is not complete

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Which of the following are not part of the 400G originating modulation technology?

• A.Advanced oDSP algorithm
• B.Multi-carrier generation and multiplexing
• C.High-order modulation (xQAM)
• D.FDDM/Nyquist spectrum compression technology

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Which of the following description of 1+1 optical line protection is wrong?

• A.The active and standby input light difference defaults to 5dB.
• B.The switching method defaults to non-recovery
• C.The primary and secondary input lights initial difference defaults to 0.
• D.The switching mode defaults to double-ended switching

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