If you have this type of alarm:
Location Information: eNodeB Function Name=RT_L21_F, Local Cell ID=2, Cell FDD TDD indication=FDD, Cell Name=RT_L21_F1_2, eNodeB ID=3935, Cell ID=12, Specific Problem=RF module abnormal Alarm Name: Cell Unavailable Alarm ID: 29240 Link Name:
Please try follow the procedure below:
1. Restart the MRFU.
2. Change the MRFUs.
3. Replace CPRI cables and SFPs.