Description of the problem

The BUS_ERR alarm is reported on the standby cross board of an OSN2000 device in a bureau, which does not affect the service.

Network element master version: 5.50.3.12

Cross-board D2XCS version: 1.12

The bus_err alarm is reported on both the master and backup cross-over boards. The alarm parameters are: 0x01 0x05 0xff 0xff 0xff.

process

1. Business board failure.

2, the business board is physically not in position, but configured with a logical board, and another normal open business board between the configuration of the business.

3. Cross-clock board failure.

4. Frame master board failure.

root cause

Adjacent slot veneer failure

Solution

1, according to the alarm parameters, according to the OSN2000 bus number and the corresponding relationship between the board, positioning for the 6-slot business board and the bus between the cross board, but the customer feedback, the 6-slot is not inserted in the single board at all.

Board number XCS bus number D2XCS host bus number

Slot 4 1~2 1~2, 33~34

Slot 5 3~4 3~4, 35~36

Slot 6 5~12 5~12

Slot 27 13~16 13~16, 37~48, 49~64

Slot 28 17~20 17~20, 65~76, 77~92

Slot 9 21~28 21~28

Slot 10 29~30 29~30, 93~94

Slot 11 31~32 31~32, 95~96

2. Since the OSN2000 device is configured with a service board that is not physically in place, but is configured with a logical board, and another service board that is normally open, the OSN2000 device is configured with a service

When the OSN2000 device is configured with a logical board while the service board is not physically in place, it will also report BUS ERR alarms on the cross board. Therefore, it is suspected that the alarm is caused by the service in slot 6 of the customer's previous configuration. After querying through the :cfg-get-xc:0,0 command, it is found that there is no service remaining in slot 6, so this cause is excluded.

3. Since the customer has already replaced the frame and two cross boards D2XCS before to handle the BUS ERR alarm, the possibility of frame and cross board failure is unlikely.

4, the customer feedback in the replacement of the frame, re-insert the single board, in the 5-slot single board plugged into the start of the BUS ERR alarm reported, and hard reset 5-slot single board, BUS ERR alarm will be eliminated, and so on the 5-slot single board after the start of the work, and then will be reported again.

5. It is suspected that the 5-slot board has interfered with the neighboring 6-slot bus, resulting in the reported BUS ERR alarm. After replacing the 5-slot single board, the BUS ERR alarm disappears, indicating that it is caused by the 5-slot single board failure.

Recommendation and Summary

1. For the BUS ERR alarm, first of all, you can locate which slot is reported by which single board bus through the alarm parameters.

2, when the configuration, cross board, service board and frame problems are excluded, the bus alarm may also be caused by other single board failure interference.

The related technical information in this chapter and the SDH equipment troubleshooting process are collected and organized by Shenzhen Optical Transmission Network Technology Co. (www.opticaltrans.com), and are reproduced with permission! Our company specializes in the sale of Huawei SDH optical transmission equipment,SDH transmission equipment.