The 40 Gbit/s and 100 Git/s coherent systems do not require dispersion compensation because the coherent board has a large dispersion tolerance. NG WDM does not support non-coherent networks and coherent networks for hybrid transmission.

• A.FALSE
• B.TRUE

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In WDM systems, when using less than () wavelength, it is ideal to use dielectric thin film filter (TFF).

• A.20
• B.8
• C.4
• D.16

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Which of the following description of the principle of automatic protection switching of the standard SSM protocol are correct? (Multiple choice)

• A.According to the clock source priority table, the network element first selects the clock with the highest quality level from the available clock sources as the homologous source.
• B.If there are multiple clock sources with the highest quality level, the network element selects the clock with the highest clock priority as the synchronization source.
• C.The network element broadcasts the clock quality information and the clock source ID of the synchronization source through the downstream station between the S1 bytes, and notifies the upstream station that the clock quality from the local network element is "not available for synchronization" by the S1 byte in the direction of the synchronization source.
• D.The network element broadcasts the clock quality information of the synchronization source to the downstream site through the S1 byte, and notifies the upstream station that the clock quality from the local network element is "not available for synchronization" by the S1 byte in the direction of the synchronization source.

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Which of the following statements about ROADM are correct?

• A.O&M personnel need to provide onsite support for wavelength adjustment at ROADM sites.
• B.ROADM can adjust the optical power of the pass-through wavelength and the added wavelength.
• C.ROADM technology uses the NMS software to deliver configurations to implement the wavelength adding/dropping and pass-through status.
• D.NG WDM equipment supports ROADM with fixed spectrum and Flexible ROADM with flexible spectrum.

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Which of the following alarms will trigger the optical line protection switching? (Multiple choice)

• A.R_LOF
• B.R_LOS
• C.MUT_LOS
• D.POWER DIFF_OVER

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