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

• A.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.
• B.When some faults occur, there may be no obvious alarms or performance events reported, and sometimes no alarms or performance events are found.
• C.Field maintenance personnel cannot understand the current operating condition of the equipment.
• 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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The following limitations of alarm and performance analysis methods are: (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.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.
• C.Field maintenance personnel cannot understand the current health of the equipment.
• D.The network administrator cannot obtain any alarms, time, and historical alarms of the device.

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The length range of the DATA field in the Ethernet frame structure is ().

• A.64-1500 bytes
• B.46-1518 bytes
• C.46-1500 bytes
• D.64-1518 bytes

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In the WDM system, after a certain distance of transmission, the optical signal-to-noise ratio of the receiving signal will be reduced to a certain extent. What is the main reason?

• A.Use of EDFA
• B.Fiber attenuation is too large
• C.No new fiber is used
• D.Use of the splitter combiner

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For a 10G OTU board, the receiving end optical module uses PIN module. Which of the following receiving powers is in the normal receiving range of the board?

• A.9dBm
• B.19dBm
• C.-9dBm
• D.-19dBm

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