No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

The unreasonable temperature threshold leads to TEMP_OVER reported on SSR1EFS8

Publication Date:  2012-07-25 Views:  41 Downloads:  0
Issue Description
Customer finds that TEMP_OVER alarm is reported on SSR1PEFS8 board at slot 9 of serveral OSN1500 sites when other services boards are normal. The room temperature is around 25 centigrade. The host software version is 5.36.31.15,SSR1PEFS8 board version is 1.52.
Alarm Information
TEMP_OVER             MJ          start       2011-10-09 15:10:50      None                     NSA     NEW_BOARD                          board=9;01; 
Handling Process

The upper threshold of SSR1PEFS8 board temperaute is low ,then R1PEFS8 board reported TEMP_OVER alarm often.
1.Normally, we can set threshold of board temperaute by follow method: 
// configure the threshold of board temperaute:0/75 centigrade
:cfg-set-bdtempth:boardid,750,0 
//query the threshold of board temperaute
:cfg-get-bdtempth:boardid 
The result should be:
                                   BOARD-TEMP-TH                                
                             TEMP-HIGH-TH  TEMP-LOW-TH                          
                             750           0                                     
  Total records :1    
But as the SSR1PEFS8 board can not support this command(NSERR_CFG_BAD_TEMP_TH will report when we use the configure command).
2.We only can use the optp command to configure it:
//configure the threshold of board temperaute:0/75 centigrade(0x02ee=750)
#9-328:szhw [][][2011-11-26 01:28:09+08:00]>
:optp:9,02,67,01,90,05,00,09,00,00,02,ee,00,00,00,00
//query the threshold of board temperaute
#9-328:szhw [][][2011-11-26 01:28:10+08:00]>
:optp:9,02,67,01,90,06,09
Optp cmd : 9006                                                                  
00 00 02 ee 00 00 00 00                                                          
  Total records :1 


Root Cause
According the data analysis, we find current temperature of R1PEFS8 board is 66.5 centigrade and the temperature threshold is 65 centigrade. So the alarm report is normal.
:cfg-get-bdtemp:9
    BOARD-TEMP                                  
                                  BID     TEMP-NOW                               
                                  9       665                                    
  Total records :1                 
:cfg-get-bdtempth:9
    BOARD-TEMP-TH                                  
                             TEMP-HIGH-TH  TEMP-LOW-TH                           
                             650           0                                     
  Total records :1  
At same time, we check the temperature of other service boards which are 10 centigrade lower than the SSR1PEFS8 board. so we suspect that the alarm threshold setting is unreasonable.
:cfg-get-bdtemp:6
    BOARD-TEMP                                  
                                  BID     TEMP-NOW                               
                                  6       475   
 
:cfg-get-bdtemp:7
     BOARD-TEMP                                  
                                  BID     TEMP-NOW                               
                                  7       540                                    
  Total records :1
 
Then we do the test in the lab to confirm it: The room temperaute is 55 centigrade, the detect the chips of SSR1PEFS8 boards:
power chip temperaute:72.6 centigrade
EP3C80 chip temperaute:71.7 centigrade
Use navigator to query the  temperaute of SSR1PEFS8:
#9-555:szhw [][][2010-07-24 17:57:25+08:00]>
>>>:cfg-get-bdtemp:9
                                     BOARD-TEMP                                   
                                  BID     TEMP-NOW                               
                                  9       765                                    
  Total records :1       
So confirm that the board temperaute is beyond the upper threshold which is not reasonable.   
Suggestions
The SSR1PEFS8 is far away from the fan, so the its temperaute is a little higher than other boards. When designs upper threshold of SSR1PEFS8 board temperaute, R&D ignores it and uses the default value.


END