Hello, everyone!
This post will tell you one issue for POWER_ABNORMAL on SCC.
Problem description:
POWER_ABNORMAL alarm on SCC baord on OSN 3500 in 1+1 configurations.
Handling procedure:
With the detailed analysis of the issue, please find below the findings and necessary action points
1. Check the alarm, the SCC report the alarm bellow. The alarm shows that there is 3.3V backup power issue.
2902672 25 POWER_ABNORMAL MJ start 2016-05-12 09:06 None 0x05 0x00 0x01 0x00 0xff
2902673 25 POWER_ABNORMAL MJ start 2016-05-12 09:06 None 0x0e 0x00 0x01 0x00 0xff
2902674 24 POWER_ABNORMAL MJ start 2016-05-12 09:06 None 0x05 0x00 0x01 0x00 0xff
2902675 24 POWER_ABNORMAL MJ start 2016-05-12 09:06 None 0x0e 0x00 0x01 0x00 0xff
2. We read the 3.3v power value via SDH board. The value is 0. It also shows that the 3.3 backup power abnormal.
#9-2031:szhw [2031-Mardan ][][2016-05-12 09:06+05:00]>
:optp:8,0,9b,1,30,08,c6,c6,c6,3c,3c,3c
#9-2031:szhw [2031-Mardan ][][2016-05-12 09:06+05:00]>
:optp:8,0,9b,1,35,01,0
Optp cmd : 3501
03 25 03 54 00 00 01 83 04 96 05 17 01 49 02 48
Total records :1
#9-2031:szhw [2031-Mardan ][][2016-05-12 09:06+05:00]>
:optp:8,0,9b,1,30,08,e7,e7,e7,a5,a5,a5
#9-2031:szhw [2031-Mardan ][][2016-05-12 09:06+05:00]>
:optp:b,0,9b,1,30,08,c6,c6,c6,3c,3c,3c
#9-2031:szhw [2031-Mardan ][][2016-05-12 09:06+05:00]>
:optp:b,0,9b,1,35,01,0
Optp cmd : 3501
03 31 03 56 00 00 01 84 05 02 05 24 01 50 02 48
Total records :1
#9-2031:szhw [2031-Mardan ][][2016-05-12 09:06+05:00]>
:optp:b,0,9b,1,30,08,e7,e7,e7,a5,a5,a5
#9-2031:szhw [2031-Mardan ][][2016-05-12 09:06+05:00]>.
Root cause:
The 3.3 backup power is provided by AUX board. So it may cause by AUX board fault.
Solution:
According to the above analysis,
1. Please apply the MW. And bring a new AUX board to the site.
2. Plug out the AUX board and check the slot. Please take a picture of the slot. We need to make sure the slot is clean and OK.
3. Insert the new AUX and wait the board online. Then check the alarm, to check whether the alarm is cleared.
4. If the alarm is not cleared, we need to further check. (now the power_abnormal alarm don’t affect the service , but the further check will affect the service, so before you do the further check, please get downtime)
（1） plug out the slave xcs board and check the slot. Then check whether the alarm disappear. If it disappear, you need to check and replace the XCS board.
（2） Plug in the XCS board and wait for it online. Run “:cfg-get-workstat:” in navigator to check the xc board’s work status.
（3） After the work status is “working”, plug out the master xcs board and check the slot. Then check whether the alarm disappear. If it disappear, you need to check and replace the XCS board.
（4） Plug in the XCS board and wait for it online. Run “:cfg-get-workstat:” in navigator to check the xc board’s work status.
（5） Plug out and plug in other board like the XC board one by one (No need to plug out the SCC board). When the alarm disappear, please stop and replace the board.
If the alarm is still not cleared after all the operation, there may be something wrong with the shelf. We need to replace it.
That's all, I welcome everyone to leave a message and exchange in the comment area!
Thank you！
