The setting of alarm reversal is based on:

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

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Which of the following description of the Optix OSN 9800 sub-rack is correct? (Multiple choice)

• A.The OSN 9800 U16 sub-rack has a total of 16 service slots. These slots have the same capacity and support up to 400 bit/s ODUk crossover in a single slot.
• B.In the OSN 980 0U32 sub-rack, IU70 is the primary CTU and IU78 is the standby CTU.
• C.When the OSN 9800 Universal Platform Sub-rack is used as a slave sub-rack, the main control board must be placed.
• D.The service board can be inserted into the IU18 slot only when the OSN 9800 P18 is used as the slave sub-rack.

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When many alarms are reported at the same time, the alarm handling priority is as follows: Handle alarms according to the priorities of equipment alarms (such as BUS_ERR, HARD_ERR, and COMM_FAIL), optical-layer LOS, electrical-layer OTUk_LOF, ODUk_SSF, and protection switching.

• A.True
• B.False

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Before the optical power commissioning of an ROADM board, you need to configure virtual optical-layer services. Otherwise, the ROADM board blocks all wavelengths by default.

• A.False
• B.True

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

• A.The agreement must be completed after the protection configuration of each site on the ring network is completed.
• B.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.
• C.Enhanced ODUk ring network protection, no need to set up management nodes. If the management node is set, there is no impact on protection.
• D.Ordinary ODUk ring network protection does not require setting a management node.

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