All the board on slave subrack report BD_status alarm at short time. The case appear for several times.
We query the data and find one record about AUX reseting.The customer have said nobody execute reseting operation. So we can judge the AUX on slave subrack have problem.
After replacing the AUX on slave subrack,the alarm don't appear again.
Because mater subrack have no problem,so the possible cause can have:
1. network cable between master subrack and slave subrack have problem.
2.AUX on master subrack have problem
3.AUX on slave subrack have problem.
4.SCC on slave subrack have problem.
All the board on slave subrack can report BD_status alarm because of AUX problem.