The following basic principles for fault location in WDM systems are (). (Multiple Choice)

• A.First two-way, then one-way first
• B.First locate external and then location transmission
• C.First single wave, followed by multiple waves
• D.First advanced, then low level

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The main application scenarios for board compatible replacement are (). (Multiple Choice)

• A.Change the board ID
• B.Replacement board
• C.Change the board IP
• D.Expanding the board

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Generally, in the NG WD system, the full-wave fiber input power is generally less than 20dBm. What is the main reason?

• A.To avoid nonlinear effects
• B.In order to maintain the personal safety of personnel
• C.In order to protect the cable
• D.In order to extend the life of the laser of the board

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Which of the following statements about the advantages of OTN are wrong?

• A.OTN provides up to five levels of nested or overlapping TCM connection monitoring.
• B.OTN provides high-speed interfaces of 2.7 Gbit/s, 10.7 Gbit/s, 43 Gbit/s and even 111.8 Gbit/s.
• C.OTN provides powerful out-of-band FEC function to effectively ensure line transmission performance.
• D.WDM function is used to meet the requirement of Tbit/s bandwidth per fiber.

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Which of the following statements about the line fiber quality monitoring performance parameters is wrong?

• A.When the pulse width increases, the light emitting time increases and consequently a larger energy is obtained. This means that a larger dynamic range can be acquired but also larger dead zones will result.
• B.The total fiber loss will affect the detection distance and the dynamic range is fixed for the same detection mode. Therefore, a larger total fiber loss indicates a smaller detection distance.
• C.The pulse width of emitted optical pulses varies according to monitoring modes, and affects the detection distance and measurement precision. A greater pulse width provides a larger dynamic range, longer detection distance and better measurement precision.
• D.Measurement is performed multiple times within the detection time. The average value is obtained based on the measurement results to improve the measurement precision. The actual duration from the time when a detection event starts to the time when the detection results are returned will be longer than the Detection time.

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