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NE80 Prompts 48v Power Supply Input Alarm and It cannot be Solved

Publication Date:  2012-07-27 Views:  31 Downloads:  0
Issue Description
The alarm LED of NE80 SRU is on. Check alarm record and there is 48V power supply alarm. Check power supply frame, but there is no alarm.|
Warning information of slot 24:                                                 
  -48V input alarm!    
[NE80]disp dev                                                            
NE80''s Device status:                                                           
Slot #    Type    Online    Register      Status      Primary   NET Port        
24        DPR     Present   Registered    Abnormal    NA        NA              
[NE80]disp dev 24     
 Warn type                      Status  
 The first -48V input           Normal  
 The second -48V input          Normal 
 Temprature sensor              Normal
 Output switch 1                Normal
 Output switch 2                Normal 
 Output switch 3                Normal 
 Output switch 4                Normal 
 Thunder Protected Board 1      Normal 
 Thunder Protected Board 2      Normal    
Alarm Information
disp alarm re all                                                               
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -     
Warning information of slot 24:                                                 
  -48V input alarm!       
Handling Process
Execute reset slot 24 and then there is no alarm and it recovers.
Root Cause
The power supply prompts alarm, e.g. the voltage occurs vibration and exceeds designated range. When the voltage recovers, the alarm releases. The VRP system software of SRU has defect, it does not handle the alarm in time. 
The problem exsits in version of 04xx. 
Suggestions
Null

END