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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Customer Example 1+1 protect when using different routes, the same wavelength cannot be used for the working wavelength and the guard wavelength.

• A.TRUE
• B.FALSE

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On the ROADM board, you need to configure the virtual optical layer service before the optical power is commissioned. Otherwise, the ROADM limit board blocks all wavelengths by default.

• A.TRUE
• B.FALSE

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Which of the following paths are not related to the business?

• A.Client
• B.OCh
• C.OSC
• D.ODUk

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