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在配置了复用段保护的SDH系统中,若发生光缆故障,SDH环会发生复用段保护倒换,在光缆修复后,保护倒换自动恢复。然而有时候存在光缆修复后系统倒换却未恢复的情况,在这种情况下的合理分析及处理就显得尤为重要。复用段故障出现后需要先检查复用段协议状态,当业务中断时,环回手段也是快捷有效地工具,了解复用段原理并有效运用环回手段可以快速有效定位故障。
In an SDH system configured with multiplex section protection, if a fiber cable fault occurs, multiplex section protection switching occurs in the SDH ring. After the optical cable is repaired, the protection switching is automatically restored. However, sometimes there is a case where the system switching is not restored after the optical cable is repaired, and the reasonable analysis and processing in this case is particularly important. After the fault occurs in the multiplex section, you need to check the protocol status of the multiplex section first. When the service is interrupted, the loopback method is also a quick and effective tool. Understanding the principle of the multiplex section and using the loopback effectively can locate the fault quickly and effectively.