1. OSN3500 device host version is V100R010C03,OSN7500 device host version is V100R010C03.

2、Dual-fiber bidirectional multiplexing segment protection ring network: A-B-C-D-E-F-a trunk ASON-Beijing H network elements, A for the OSN3500, B, C, D, E network elements for the OSN7500 composed of dual-fiber bidirectional multiplexing segment protection environment, E and F composed of 1 +1 linear multiplexing segment (STM-16), F for the DXC equipment, A network elements docking business-side routers, the business through the A-B composed of 1 +1 linear multiplexing segment (STM-16) via B-C -D-E through the DXC equipment F network element uplink a trunk ASON network across the provinces to the local network in Beijing.

3, A network element of the 14-slot, 5-slot N4EGS4 single board to open a 400M service to the Beijing local network, a day 5-slot to Beijing service is normal, 14-slot to Beijing service interruption, the port to receive packets is normal, no packets sent, no alarms.

Alarm Information

No Alarms

Processing

1、Beijing local network element H does physical hard loopback to A. A network element's 14-slot EGS4 single board port receives packets normally, no packets are sent, and there are no alarms.

2、Suspecting that the provincial trunk line to the local fault, from the DXC equipment F network element of the 8-slot SLQ16-2 port (docking a trunk ASON network element) to the business side of the direction of the optical port and VC4 internal loopback, 14-slot EGS4 single-board port port packet collection is normal, no packets sent, no alarms.

3、Preliminary judgment for the local network failure in the province, hang Ethernet tester on the port of the router on the business side of A network element, and do VC4 external loopback from SLQ16-2 in slot 8 of B network element to the business side, and the packet collection is normal on the port of the EGS4 single-board port, no packet is sent, and there are no alarms.

4. Configure unidirectional time slot crossover for EGS4 in slot 14 (exclude the failure of optical board and crossover in this station), the packet collection of EGS4 single board port is normal, no packet is sent, and there is no alarm.

5. Judging that the port of EGS4 single board in slot 14 is faulty, change the service to the port of EGS4 single board in slot 14, and the port of EGS4 single board in slot 14 receives packets normally, no packets are sent, and there is no alarm.

6、Since there is no other service on the single board in slot 14, after resetting the single board in slot 14, the single board port receives packets normally, no packets are sent, and there is no alarm.

7. Positioned as hardware failure of EGS4 board in slot 14, change the service to port 2 of EGS4 board in slot 5, and the packets received and sent by EGS4 board ports are normal. The service side test service is back to normal.

8、Troubleshooting is completed, and the reason is caused by hardware failure of EGS4 single board.

Root cause

Hardware failure of the EGS4 single board leads to

Solution

Replace the EGS4 single board with the same model.

Recommendations and Summary

Hardware failure of EGS4 single board causes the port to send too few packets. When the single-board port receives packets normally without sending packets, it is recommended to reset the single-board directly.

The related technical information in this chapter and the troubleshooting process of SDH equipment are provided by Shenzhen Optical Transmission Network Technology Company Limited (www.opticaltrans.com), please retain the reproduction! Huawei SDH Optical Transmission Equipment,SDH Transmission Equipment Sales