Hello, everyone!
Today, I'd like to share a case with you.
Product Model: OSN1800V
Problem Description
On October 4, field engineers reported that the point-to-point link between NE-A and NE-B was interrupted for multiple times.
On October 5, the FSE reported that another point-to-point link between NE-C and NE-D was also interrupted in the early morning. The fault symptom was the same.
Problem Analysis
Step 1 Alarm and NE Log analysis
1. NE-B
Find the following records based on the NE blackbox data:
TYPE=0xf0000004 indicates the device power-off record. Let's view the alarms generated during the last three power-offs.
a) 2020/10/1 8:26:14 (UTC+4=12:26:14)
b) 2020/10/1 8:47:01 (UTC+4=12:47:01)
c) 2020/10/1 20:59:17 (UTC+4=2020/10/2 0:59:17)
2. NE-D
TYPE=0xf0000004 indicates the device power-off record.
Analyze the alarm generated when the last power failure occurs.
a) 2020/10/4 20:25:03 (UTC+4=2020/10/5 0:25:03)
b) All boards on the device restarted during the period.
c) The fault time is the same as that described by the FSE.
3. NE-A
TYPE=0xf0000004 indicates the device power-off record.
There has been no power outage in recent months.
4. NE-C
TYPE=0xf0000004 indicates the device power-off record.
There has been no power outage in recent months.
Step 2 Conclusion
Based on the preceding information, the summary is as follows:
1. 10/01/2020, the point-to-point link between NE-A and NE-B was interrupted for 3 times due to power failure of NE-B.
2. 10/05/2020, the point-to-point link between NE-C and NE-D was interrupted due to power failure of NE-D.
Root Cause
The links were interrupted due to device power-off.
Solution Description
1. Check the external power supply connection and confirm with the customer whether the equipment room has power supply faults during the previous failures.
2. Check whether the input voltage meets the requirement and whether the voltage is unstable.
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