Description of the problem

An OSN3500 device consists of a five-point multiplexing segment ring, network element cutover on the service for one month, a day in the ring NE3 network element transient report BUS_ERR and HSC_UNAVAIL, and along with the master and backup crossover boards frequently occurs the master and backup inverted, the network element business is normal. the OSN 3500 network for the whole 5.21.13.47p01 supporting version.

Processing

1, according to the alarm information, the two cross boards are reported bus failure, check its parameters, the master and the backup cross are because the second bus is not good reported BUS_ERR alarm, check the data after the reversal, showing that the network element master and backup cross reversal is successful, you can judge that there is no problem with the master and the backup cross single board;

2, the main backup cross are reported BUS_ERR alarm, and are shown to be the second bus, the second bus is to 2-PQ1, so the possibility of failure of the 2-slot branch board;

3, replace the 2-slot branch board, the network element alarm disappears;

4, the failure of the single board back to the company to analyze, judged to be a single board chip failure.

Root cause

Single board chip failure fault.

Solution

Replace faulty veneer

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