There are two NG-SDH network elements A and B. A is the gateway network element. The network administrator manages B through ECC routing through A. The network administrator can log in to A but cannot log in to B through A. What are the possible reasons? (Multiple choice)

There are two NG-SDH network elements A and B. A is the gateway network element. The network administrator manages B through ECC routing through A. The network administrator can log in to A but cannot log in to B through A. What are the possible reasons? (Multiple choice)

A. No crossbar inserted

B. Manually set up ECC routing

C. The optical board connected to B does not create a logic board

D. The main control board is abnormal

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Answer: ABD