The basic principles of STP device fault location are? (Multiple choice)

• A.First external, then transfer
• B.First advanced, then low level
• C.First low speed, then high speed
• D.First network, then network element

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Which of the following device types support the master-slave sub-architecture mode? (Multiple Choice)

• A.OSN 8800
• B.OSN 9800
• C.OSN 1800V

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

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

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The following description of the 1+1 protection in the board, the correct ones are: (Multiple Choice)

• A.The 1+1 protection on the board can protect the OTU board.
• B.Set the OTU as the detection unit, and the electrical layer alarms such as OTUk_LOF and OTUK_LOM will also trigger the switching.
• C.In-board 1+1 protection can be applied to chain networking and ring networking.
• D.For OSN 1800 devices, you can use the OTU with dual-selection to protect your business.

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