Which of the following ROADM boards have WSS optical modules?

• A.WSMD9
• B.WSD9
• C.RDU9
• D.WSM9

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The transmission plane mainly performs functions such as optical signal transmission, configuration protection switching, and reconnection, and ensures the reliability of the transmitted optical signal. However, the switching action of the transport layer is performed under the influence of the management dry surface and the control plane.

• A.FALSE
• B.TRUE

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Which of the following description of the PWE3 technology are correct? (Multiple choice)

• A.For PE3 emulation of Ethernet services, PW control words can be manually configured on the PE.
• B.PRE3 technology provides ATM, Ethernet, and TDM services with end-to-end virtual link emulation at the PS network boundary.
• C.The internal data services carried by PWE3 are visible to the core network.
• D.PWE3 technology belongs to the second layer VLL solution

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The network element automatically backs up the network element database to the FLASH database every 30 minutes by default.

• A.FALSE
• B.TRUE

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If OCh trails fail to be created by trail, which are the possible causes?

• A.There is no server trail.
• B.The wavelength settings at the source and sink ends are inconsistent.
• C.There are still alarms that are not cleared on the boards involved in the OCh.
• D.Some fibers are not connected.

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