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The reason the outages affected the same group and not other areas is because those customers are served by the same cable loop and the cable loop was affected by equipment failures. But the cable itself is in good working order.
中断影响同一组而不影响其他区域的原因是，这些客户使用的是同一电缆回路，而电缆回路受到设备故障的影响。但电缆本身的工作状态良好。