The Service Board of an NE20E-S Blinks Red

The service board of an NE20E-S blinks red.

1. Run the following commands to check that the board status is normal:

display device
===============================================================================

NE20E-S4's Device status:
-------------------------------------------------------------------------------
Slot #   Type    Online     Register     Status     Role   LsId   Primary     
-------------------------------------------------------------------------------
1        PIC     Present    Registered   Normal     OTHER  0      NA          
5        NSP     Present    Registered   Normal     LC     0      NA          
6        MPU     Present    Registered   Normal     MMB    0      Master      
7        MPU     Present    Registered   Normal     MMB    0      Slave       
8        PWR     Present    Registered   Normal     OTHER  0      NA          
9        PWR     Present    Registered   Normal     OTHER  0      NA          
10       FAN     Present    Registered   Normal     OTHER  0      NA          
11       CLK     Present    Registered   Normal     OTHER  0      Master      
12       CLK     Present    Registered   Normal     OTHER  0      Slave       
-------------------------------------------------------------------------------

===============================================================================
                 display device pic-status
===============================================================================

Pic-status information :
--------------------------------------------------------------------------------
Pic#   Status       Type                      Port_count Init_result  Logic_down
--------------------------------------------------------------------------------
5/1    Registered   ETH_8xGFC_CARD            8          SUCCESS      SUCCESS  

2. After the clear alarm is generated, check that the alarm indicator on the service board is still blinking red.

3. Check alarm information.

Alarm indicating that the receive optical power of GigabitEthernet 0/1/2 exceeds the lower limit

===============================================================================
                 display alarm history verbose
===============================================================================

Sequence    : 34       
AlarmId     : 0x8130055             AlarmName : hwEntityInvalid                                                
AlarmType   : equipment             Severity  : Critical         State : cleared
VS          : Admin-VS                       
StartTime   : 2017-04-20 16:24:46                    
Description : Physical entity failed. (BaseTrapSeverity=4, BaseTrapProbableCause=67697, BaseTrapEventType=5, EntityPhysicalIndex=16847107, EntPhysicalContainedIn=16842754, EntPhysicalName=GigabitEthernet0/1/2, RelativeResource=Optical Module, ReasonDescription=GigabitEthernet0/1/2 is failed, the optical module receive power is too low)
ClearTime   : 2017-04-21 09:54:56                    
ClearType   : service_resume     
ClearReason : A faulty physical entity recovered, and the fault caused by the faulty part was rectified. (BaseTrapSeverity=4, BaseTrapProbableCause=67697, BaseTrapEventType=5, EntityPhysicalIndex=16847107, EntPhysicalContainedIn=16842754, EntPhysicalName=GigabitEthernet0/1/2, RelativeResource=Optical Module, ReasonDescription=GigabitEthernet0/1/2 is failed, the optical module receive power is too low)

Because no services exist, after the interface that generates such an alarm is shut down, the alarm indicator becomes off.

The receive optical power of the interface that generates such an alarm exceeds the lower limit.

Shut down the interface that generates such an alarm as a workaround of the problem.

Check whether the low receive optical power issue is caused by a line or module fault. If so, rectify the line or module fault.