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OSN2500 LU and XC unit has different temperature after queried

Publication Date:  2012-07-25 Views:  77 Downloads:  0
Issue Description
Engineer onsite found that when checked the CXL board temperature, the LU and XC unit has different temperature, the deviation was about 10 degree centigrade.
Used command :cfg-get-bdtemp to query the XC unit temperature, it show the current temperature is about 51.5 degree centigrade.
#9-561:szhw [OSN-2014                                                        ][][2009-10-09 14:11:35+03:00]>
:cfg-get-bdtemp:80
                                     BOARD-TEMP                                   
                                   BID   TEMP-NOW                                 
                                   80    515                                      
  Total records :1                                                    
But after queried the Lu performance, the OSPITMPCUR showed that the OSPITMPCUR is 62.5 degree centigrade.
Monitored Object  Event  Monitor Period  Start Time  Value 
OSN-2014-4-Q1SL4-1(SDH-1)-OSPI:1  OSPITMPCUR(Cels.)  15-Minute  2009-10-09 15:00:00  62.50 
 
Why the deviation was about 10 degree centigrade?
Alarm Information
Null
Handling Process
Change the faulty CXL board. And the temperature is normal at the end.
Root Cause
The reason is that when we use command ":cfg-get-bdtemp" to query the XC unit temperature, the result feeds back the XC unit CPU part temperature. Only the XC board support this temperature query function. 
The normal temperature is about 60-70 degree centigrade. 
The Lu OSPITMPCUR from the Lu performance is the laser surface temperature. For CXL board always uses SFP optical module, the normal laser temperature 
is about 40 degree centigrade. For digital control module, the laser surface temperature is about 25 degree centigrade.
Suggestions
Null

END