Daily equipment maintenance items, excluding:

• A.Check the cabinet and board indicators
• B.Check the fan box and clean the air filter
• C.Check device sound alarms
• D.Check the room temperature, humidity and cleanliness

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The NG WDM two-dimensional ROADM site can use the WSMD9 single board, and its signal flow is an optical signal that is connected to the main optical channel from the "IN" optical port. The RDU (ROADM Demix Unit) optical module broadcasts nine identical optical signals, which are output from the "DM1~DM8" and "ECPO" optical ports respectively. One of the signals is localized by the splitter board, and the other eight signals are dispatched to the other eight directions. Each wave of the main optical channel is connected from the "EXPI" optical port. The multiplexed or single-wave optical signal that needs to be inserted locally is input through the "AM1"~"AM8" optical port.

• A.FALSE
• B.TRUE

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

• A.Line fiber quality monitoring function increases the monitoring accuracy by adding the averaged results to the average. The actual time required from the start detection to the software returning the test result will be greater than the "detection time" is set.
• B.Different modes of light pulse width are different in detection, pulse width affects distance accuracy and monitoring distance. The larger the pulse width, the larger the dynamic range, the longer the test distance and the higher the range measurement accuracy.
• C.Increasing the pulse width increases the duration of the laser emission, which increases the energy injected, allowing for a larger dynamic range, but an increase in pulse width results in a larger dead zone.
• D.The total loss of the fiber will affect the actual detection distance. The dynamic range of the same detection mode is fixed. The larger the total loss of the fiber, the smaller the distance that can be detected.

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Which of the following are not part of the 400G originating modulation technology?

• A.High-order modulation (xQAM)
• B.FDDM/Nyquist spectrum compression technology
• C.Multi-carrier generation and multiplexing
• D.Advanced oDSP algorithm

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Which of the following are components that reuse N wavelengths in WDM system? (Multiple choices)

• A.Supervision unit
• B.Optical amplifier unit
• C.Optical repeater unit
• D.WDM unit

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