Which of the following are limitations of the alarm and performance analysis methods? (Multiple Choice)

• A.When some faults occur, there may be no obvious alarms or performance events reported, and sometimes no alarms or performance events are found.
• B.Field maintenance personnel cannot understand the current operating condition of the equipment.
• C.In the case of complex networking, service, and fault information, many alarms and performance events may occur along with the occurrence of faults. Due to too many reports and performance events, maintenance personnel are unable to analyze.
• D.The network administrator cannot obtain the current notifications of the device, the alarm occurrence time, and the historical alarm of the device.

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

• A.ODUflex bandwidth of per TS subslot is 1.25 Gbit/s
• B.ODUflex refers to non-fixed bandwidth ODUk technology
• C.The advantage of ODUflex is that users can flexibly configure the capacity of the container according to the size of the service to achieve the most efficient use of railway bandwidth.
• D.Services supported by ODUflex range from 1.25 Gbit/s to 10 Gbit/s

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MPLS APS is a network protection mechanism that implements service creation through the detection function of MPLS OAM.

• A.TRUE
• B.FALSE

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The OTN circuit board (such as ND2) of OSN 1800V can respond to the status of the indicator light on the panel to reflect the optical power of the local end too high or too low.

• A.TRUE
• B.FALSE

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Which of the following residual dispersion values are within the dispersion tolerance of the TN52ND2 board?

• A.700ps/nm
• B.500ps/nm
• C.600ps/nm
• D.900ps/nm

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