Which of the following situations can cause the board to reinsert the BDI maintenance signal to the upstream site? (Multiple choice)

Which of the following situations can cause the board to reinsert the BDI maintenance signal to the upstream site? (Multiple choice)
A . The board reports R_LOS
B. Report OTU2_DEG on the board
C. Report OTU2_LOF on the board
D. ODU2_PM_LCK

Answer: ACD

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