Which of the following reasons may cause a business error? (Multiple choice)

• A.Transmitting laser performance degradation of the originating OTU board
• B.The tail wire connector is seriously polluted
• C.Dispersion compensation is unreasonable, such as under- or over-compensation
• D.The temperature in the equipment room is too high
• E.The optical power of the incoming fiber is too high or too low

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Which of the following device types support the master-slave sub-architecture mode? (Multiple Choice)

• A.OSN 8800
• B.OSN 9800
• C.OSN 1800V

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In the Colored&Directioned scenario of the 4D ROADM, if you want to implement local service scheduling in four directions, how many sets of M40V+D40 are needed?

• A.9
• B.1
• C.2
• D.4

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In the electrical layer overhead processing-sink function, the signal flow is from the OCh to the client direction, the PM ODUkP is detected first, and then the TCM ODUkT is detected.

• A.FALSE
• B.TRUE

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Which of the following statements about the latency of a storage and forwarding device is false?

• A.The first bit of the data frame appears at the output port of the device and stops timing.
• B.The first bit of the data frame enters the device and starts timing.
• C.Reflects the performance of network devices. Generally, it is not compared with the bit forwarding device.
• D.The last bit of the data frame enters the device and starts timing.

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