In the Colored&Directioned scenario of the 4D ROADM, if you want to implement local service scheduling in four directions, how many sets of M40V+D40 are needed?

• A.9
• B.2
• C.1
• D.4

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In a typical chained NG WDM network (such as A -> B -> C, A, B, and C are three sites), it is found that the official telephone number between the stations is not available during the commissioning. What are the possible reasons? (Multiple choice)

• A.In the SC2 board configuration of station B, the configuration is incorrectly changed to "the official does not pass the optical port."
• B.C station receiving direction OA board damage
• C.B station SC2 board is damaged

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For the nonlinear effect FWM, which of the following way is correct?

• A.Control the optical power of a single wavelength
• B.Do not use G.653 fiber in DWDM systems
• C.Using large effective area fiber
• D.Control the incoming fiber power

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The following description of the alarm, which is correct? (Multiple choice)

• A.OTUKAIS: OTUK alarm indication signal, the AIS signal is transmitted downstream, indicating that the upstream detected signal is invalid.
• B.OTUk-LOM: Multi-frame alignment signal abnormal alarm, multi-frame positioning processing continues the multi-frame out-of-synchronization (o0M) state for 3ms, generating OTUelom alarm.
• C.OTUK-TIM: The OTUK trace identifier is the TTI (Trail Trace Identifier) mismatch. This alarm is generated if the trace identifiers of the peer end and the local end do not match and the TIM detection is enabled during the control process. Compare the API (Access Point Identifiers) in the input signal with the desired API.
• D.OTUKBDI: OTUk backwards indication alarm. When the signal detected by the SM segment fails, the value of the BDI byte is 1, and the alarm is reported.

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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.TRUE
• B.FALSE

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