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Description of the problem
The SDH OSN3500 device EGT2 single board is plugged into the existing network element and reports T_LOSEX alarm, but the service can be configured normally. The customer is worried that the alarm will affect the service.
Network element host version: 5.21.31.35 (V2R11C00SPC200)
Single board hardware: N2EGT2
Alarm Information
T_LOSEX
Alarm parameters are: 0x01, 0x00, 0x02, 0x00, 0x0c.
Processing
1、Confirm that the EGT2 single board is installed normally and starts working normally (it is shown as green on the network management)
2、Replace the EGT2 single board, the problem is not solved
3, replace the EGT2 single board to the other empty slots of the network element, including 1, 2, 3, 15, 16, found that the problem still exists
4、Check the version matching table, upgrade the EGT2 board to the version matching with the host, the problem is still not solved.
5、Plug the same EGT2 board into other slots of other network elements in the current network.
It is found that no matter whether the host is a low version (V1R8) or a high version (V2R11), no T_LOSEX alarm will be reported.
Conclusion:
Suspected a product bug or alarm misreporting. After consulting with R&D, R&D reproduced the problem in the lab and found that the problem must occur on individual slots (e.g., 1, 2, 3, 15, 16) of the host version 5.21.31.35, but does not occur on other slots (e.g., 5, 6), and that it is the bus down at the wrong rate. The problem does not occur on host 5.21.31.38.
Solution:
T_LOSEX alarms can affect business, it is recommended to upgrade to V200R011C00SPC300 and later relevant mainstream versions.
Root Cause.
According to the manual, from the alarm parameters, there is a problem with the bus of the cross board in slot 10. However, if there is a problem with the crossover board, other line boards of the same network element should also report this alarm. Therefore, replace the crossover board as a last resort. Consider the following questions first:
1. Huawei EGT2 single board installation problems
2, OSN3500 EGT2 single board hardware problems
2、Slot backplane bus problem
3, SSN3EGT2 single board software and host mismatch
Suggestions and Summary
In addition to the EGT2 single board, there are other types of EOS single boards involved in this problem, including:
BDTYPE_SSN3EGS2
BDTYPE_SSN1EMS2
T_LOSEX alarms can affect the business, it is recommended to upgrade to V200R011C00SPC300 and later relevant mainstream versions.
The related technical information in this chapter and the SDH equipment troubleshooting process are collected and organized by Shenzhen Optical Transmission Network Technology Company Limited ( www.opticaltrans.com), and are reproduced with permission! Our company specializes in Huawei SDH optical transmission equipment, SDH transmission equipment sales.
