The service types supported by the PND2 board used by the OSN 8800 are: (Multiple choice)

• A.VPWS
• B.EPLAN
• C.EPL
• D.VPLS

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

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Generally, in the NG WD system, the full-wave fiber input power is generally less than 20dBm. What is the main reason?

• A.In order to extend the life of the laser of the board
• B.In order to protect the cable
• C.To avoid nonlinear effects
• D.In order to maintain the personal safety of personnel

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Which of the following description of ODUk ring protection is wrong?

• A.Enhanced ODUk ring network protection, no need to set up management nodes. If the management node is set, there is no impact on protection.
• B.Ordinary ODUk ring network protection does not require setting a management node.
• C.ODUk ring network protection is mainly applied to the ring network configuration of distributed services. It protects multiple distributed services between all sites by occupying two different ODUk channels.
• D.The agreement must be completed after the protection configuration of each site on the ring network is completed.

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The setting of alarm reversal is based on:

• A.Port
• B.Veneer
• C.Alarm
• D.Network element

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