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Low Voltage Alarms Were Reported on an NE80E

Publication Date:  2013-10-08 Views:  40 Downloads:  0
Issue Description

On an NE80E V300R003C02B608, the following alarm information was returned:

<NE80E>disp alarm all

----------------------------------------------------------------------------

Index    Level        Date        Time                  Info      

 

1        Error        11-11-08    05:14:20    The address43,channel2  voltage

                                               sensor of SlotID4 PIC1(entity)

                                              exceed lower major limit

 

<NE80E>disp alarm all

----------------------------------------------------------------------------

Index    Level        Date        Time                  Info      

 

1        Error        11-11-08    05:14:20    The address43,channel2  voltage

                                               sensor of SlotID4 PIC1(entity)

                                              exceed lower major limit
Handling Process

To address the issue, Huawei performed the following operations and observed the following information:

1. Ran the display alarm all command and found the low voltage alarm.

<NE80E>disp alarm all

----------------------------------------------------------------------------

Index    Level        Date        Time                  Info      

 

1        Error        11-11-08    05:14:20    The address43,channel2  voltage

                                               sensor of SlotID4 PIC1(entity)

                                              exceed lower major limit

2. Ran the disp voltage slot 4 command and found that the voltage on channel 2 of PIC0 and PIC1 was low.

PIC0, I2CID:3  Address:43  Unit:V

Channel Status Required Low_Alam_Threshold  High_Alam_Threshold Voltage   Ratio

                          Major     Fatal     Major     Fatal              

--------------------------------------------------------------------------------

0       NORMAL   1.20     1.14      1.08      1.26      1.32      1.20     1.00

1       NORMAL   1.80     1.71      1.62      1.89      1.98      1.80     1.00

2       MAJOR    3.43     3.25      3.10      3.60      3.77      3.25     0.58

3       NORMAL   5.00     4.50      4.00      5.26      5.50      4.97     0.38

 

PIC1, I2CID:4  Address:43  Unit:V

Channel Status Required Low_Alam_Threshold  High_Alam_Threshold Voltage   Ratio

                          Major     Fatal     Major     Fatal              

--------------------------------------------------------------------------------

0       NORMAL   1.20     1.14      1.08      1.26      1.32      1.20     1.00

1       NORMAL   1.80     1.71      1.62      1.89      1.98      1.81     1.00

2       MAJOR    3.43     3.25      3.10      3.60      3.77      3.25     0.58

3       NORMAL   5.00     4.50      4.00      5.26      5.50      4.97     0.38

Huawei concluded that the alarms were reported possibly because the voltage on the specific channel exceeded the lower alarm threshold or because the device mistakenly triggered alarms.
Root Cause
The software incorrectly set the lower alarm threshold and then unexpected alarms were triggered.
Solution

The issue is a known false alarm reporting.

In V300R003C02B697SPH038, the subcard alarm threshold has been optimized so the lower voltage alarm threshold was changed from 3.25 V to 3.10 V. No patch is available for V300R0003C02B608 to resolve the issue.

                       

L1XX   3   43   2   NORMAL 3.30     3.10    2.95    3.55    3.70    3.31  0.58            

It is recommended that you upgrade the product version to resolve this issue.

If an upgrade cannot be performed, run related command to clear the alarms. Replacing the board is not necessary.
Suggestions
None

END