Which of the following statements about ROADM are correct?

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

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The causes of discrete services are as follows:

• A.The logical fiber connection of the NE is inconsistent with the physical fiber connection.
• B.The cross-connection configuration on the NE is incorrect.
• C.A subnet service whose source or sink port is not in the management scope of the U2000 is available.
• D.The configuration data on the NE side is not uploaded to the U2000.

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Which of the following description of the AU pointer are correct? (Multiple choice)

• A.Since the value of the AU-PTR pointer is placed in the last 10 bits of the two bytes H1 and H2, the valid value is 0~1023.
• B.AU-PTR refers to the location of the J0 byte.
• C.The root cause of the AU pointer adjustment is that the clocks between the upstream and downstream stations are not synchronized.
• D.If the receiving end detects that the H1H2 byte is all "1", the local end generates an AU-AIS alarm.

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Which of the following is the data that needs to be collected and saved in the event of a failure? (Multiple Choice)

• A.Configuration data for network elements and boards
• B.Operation log of the network management
• C.Running status data of the NE and the board
• D.Equipment alarms and performance events

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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 9 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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