为什么交换机插入电口模块，不插网线，网口灯亮黄灯

交换机插入电口模块，不插网线，网口灯亮黄灯，状态为Link Up，正常应该为网口灯灭，状态为Link Down，可能是什么原因，查询了电口模块PHY芯片寄存器，自动协商未完成

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