Description of the problem

The Huawei OSN3500 device Ethernet veneer binds multiple VC4s, and different VC4s take different routes within the intelligent domain and are transmitted through the gold-level service using the multiplexed segment work resources, and after the multiplexed segment is inverted, the data service is interrupted. The data veneer reports the ALM_GFP_dLFD alarm (unable to group frames).

Processing

The data board is bound to 2 VC4s. by removing one of the bound VC4s, the service is restored.

Root Cause

Multiple VC4 services bound by Ethernet go on multiple multiplexed segments in the intelligent domain and go on different routes. When the multiplexed segments are inverted, one of the VC4 services goes on the multiplexed segment protection, which passes through multiple nodes, and the actual distance is very long, exceeding the maximum distance difference of the data veneer. Eventually, the delay of the virtual cascade is too large, and it is impossible to group frames, and the service is long broken.

Solution

1. Data services are transported using silver-level services within the smart domain.

2. Silver-level services of the same data board are configured to the same intelligent service group.

3. the TE link of the whole network should be set up with the corresponding actual distance.

Recommendation and Summary

You must be careful about the type of service used for data services within the smart domain, and choose the appropriate type of service based on the actual network conditions.

This chapter of related technical information and SDH equipment troubleshooting process by Shenzhen Optical Transmission Network Technology Co., Ltd. collected and organized (www.opticaltrans.com), reproduced please retain! Our company specializes in Huawei SDH optical transmission equipment, SDH transmission equipment sales.