Which of the following are the components of general package format of PWE3? (Multiple Choice)

• A.CW (Control Word)
• B.Payload
• C.Type
• D.MPLS label

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The wave division system complement to chromatic dispersion mainly adopts the DCM compensation method. The following statements about DCM dispersion compensation, which is wrong?

• A.The DCM module is more likely to cause nonlinearity than the line transmission fiber, so it is necessary to strictly control its fiber-optic power.
• B.Improper configuration of the DCM will result in degradation of the system signal-to-noise ratio.
• C.Improper configuration of the DCM will result in degradation of the receiving end performance.
• D.10G system with line fiber length less than 400km, G.652 DCI can be used to compensate G.655LEAF).

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The following description of the signal flow of the OTM site (OSN 8800 device), which is wrong?

• A.Service transmission direction: SDH signals-> LSX->M40V-> OBU1-> FIU-> Line
• B.Service transmission direction: SDH signals-> LSX-> M40V-> OBU1-> Line
• C.Service receiving direction: Line->FIU-> OAU-> M40V-> LSX-> SDH signals
• D.OSC receiving direction: Line-> FIU-> Sc2

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

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For an MSTP device, the service layer path is a path existing on the network management side, and the client layer path is a path existing on the network element side.

• A.FALSE
• B.TRUE

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