The optical monitoring channel wavelength used by the ST2 board is: (Multiple choice)

• A.1510nm
• B.1471nm
• C.1511nm
• D.1491nm

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The OSN 8800 device is protected by fan redundancy. When any fan in the fan box is broken, the system can still operate normally for a long time.

• A.FALSE
• B.TRUE

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Which of the following description of the extended ECC is correct? (Multiple Choice)

• A.Extended ECC recommends to use manual basis, which reduces mutual negotiation between network elements.
• B.In the automatic extended ECC mode, you need to connect the Ethernet ports of the two NEs with a direct-connected network cable (or a standard network cable through B), extend the ECC, and specify the server and client.
• C.Extended ECC is divided into automatic extended ECC and manual extended ECC. One network element can only support one mode at the same time. These two methods cannot be directly docked.
• D.The scale of the extended ECC network (the sum of the server and the client) must not exceed 8.

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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.The agreement must be completed after the protection configuration of each site on the ring network is completed.
• C.Ordinary ODUk ring network protection does not require setting a management node.
• D.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.

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If tunnel APS is configured for the tunnel to which the PW belongs, PW APS cannot be configured for the PW.

• A.False
• B.True

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