Which of the following alerts does not trigger an AU-AIS alert?

• A.B2-ExC
• B.AU-LOP
• C.R-LOS
• D.MS-AIS

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On OSN Series transmission devices, ethernet ports cannot access tagged and untagged frames at the same time

• A.False
• B.True

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Which of the following statements about the EFS4 board are correct? (Multiple choice).

• A.The board interface is the LC interface.
• B.The board supports three layers of text exchange. .
• C.The plate must be used with the processing plate.
• D.The board has four FE ports. .

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