Description of the problem

Huawei Metro2500+_OSN3500 and 9500 form a four-point ring. 2010-10-06 At 4:00 a.m., the OSN3500 cross board abnormally generated a master-standby inversion, and at the same time the multiplexing segment also appeared to be inverted, but this point was thrown out, resulting in service interruption at this site.

Processing

Net Element Hosting Software Version: 5.21.18.50

Cross-board software version: 8.12

The specific hardware faults are: board 9 has a CHIP_FAIL alarm indicating that the 1st SD606 chip is abnormal; in which since July, other single boards (10 crossover boards, 8 and 11 circuit boards) have frequently detected a momentary BD_STATUS on board 9, and there is a fault in the in-position detection logic on board 9.

Root cause

Hardware failure of the No. 9 cross veneer board resulted in an abnormal inversion of the multiplexed segment, and an abnormal veneer in-place state when the No. 9 board was the main board resulted in an inability to process the K bytes and events reported by the line board.

Solution

Replace cross veneer board #9.