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The Power Status of the NE80 Could Not Be Monitored Because of the Power Supply

Publication Date:  2019-07-18 Views:  94 Downloads:  0

Issue Description

It was reported that the power status of the NE80 at a site could not be viewed. The device powered by direct current ran normally. The power status of the device could not be identified remotely.
Version of the device: 8011V100R002B03D051SP02 

Alarm Information

1. Accessing the device through Telnet, the engineer found the power status was null:
<NE80_A>display power status?
<null> None of power and dpower is present!
2. Checking information about the device, the engineer found no power information:
<NE80_A>dis devi
NE80’s Device status:
Slot #   Type   Online   Register      Status   Primary   NET Port
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1      LPUB    Present   Registered   Normal   NA      Open
2      LPUB    Present   Registered   Normal   NA      Open
10    LPUF    Present    Registered  Normal   NA      Open
17    MPU      Present    NA                 Normal   Master    NA
18    MPU      Present    NA                 Normal   Slave   NA
19    NET      Present   Registered    Normal  Master NA
20    NET      Present   Registered    Normal  Slave   NA
21    CLK      Present   Registered    Normal  Master NA
22    CLK      Present   Registered    Normal  Slave   NA
25     FAN     Present    Registered   Normal   NA       NA 

Handling Process

The front-line engineer was asked to check the device on the site. Then the engineer found that the NE80 was not powered by the power supply made by Huawei, but by the -48 V power in the customer’s power distribution room. That explained why the power status of the NE80 could not be monitored. 

Root Cause

1. Because the device was powered by direct current, the fault was probably caused by the abnormal monitoring board. In this case, the abnormal board needed to be replaced with a new one.
2. Although the device ran normally, the fault may be caused by the power module itself since no one was present on the site.
3. Others. 



Carefully check the site for troubleshooting the fault. In terms of the problem with the power, we tend to think it is caused by our own devices, and ignore the fact that the customers may use their own power supply.