1、OSN3500 equipment host version is V100R010C03, OSN7500 equipment host version isV100R010C03.

2、Dual-fiber bidirectionalmultiplexing segment protection ringnetworking: A-B-C-D-E-F-a stem ASON-Beijing H network elements, A for theOSN3500, B, C, D, E network elements for the OSN7500 composed of dual-fiber bidirectional multiplexing segment protection environment, E and Fcomposed 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, noalarms.

No alarm

1、Beijing local network element H does physical hard loopback to A. A network element 14-slot EGS4 single board portreceives packets normally, no packets are sent, and there are noalarms;2 、Suspected that the provincial trunk to the local fault, from DXC equipment F network element 8-slot SLQ16-2 port (docking a trunk ASON network).

2、Suspecting that the trunk line in the province to the local fault, from the DXC equipment F network element8 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-slotEGS4 single-board port portpacket collection is normal, no packets sent, noalarms.

3、Preliminary judgment islocalnetwork failure inthe province, hang Ethernet tester on the router port on the business side of Network Element A, and do VC4 external loopback from SLQ16-2 in slot 8 of Network Element B to the business side, and thepacket collection is normal on thesingle board port of EGS4, no packet is sent, and there is no anyalarm; 4 、Perform EGS4 internal loopback and VC4 internal loopback on slot 14 of EGS4, thepacket collection is normal, no packet is sent and there is no anyalarm.

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

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 portof EGS4 single board inslot 14receives packets normally, no packets are sent, and there is noalarm.

6、Since there is no other service on the 14-slot EGS4 board, after resetting the 14-slot EGS4board, thepacket collection is normal, no packet is sent, and noalarmis generated.

7. Positioned as hardware failure of EGS4 board in slot 14,change the service to port 2 of EGS4 board in slot 5, andthe packets received and sent byEGS4 board portsare 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.

Hardware failure of EGS4 single board

Replace the EGS4 board with the same model.

The hardware failure of OSN3500 SSN1EGS4 single board causes the port to send too few packets. When the single-board port receives packets normally and does not send packets, it is recommended to reset the single-board directly.