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Mercury 水星 H105M的第4口接上主机，其对应的4号指示灯亮起；可是，第5口上接主机，...
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H105M的第4口接上主机，其对应的4号指示灯亮起；可是，第5口上接主机，也是4号指示灯亮。这是为什么？
第5口是个uplink口，它与4口共享通信信道。一般情况下，这两个口只接其中一个，不能同时接。它们之间任何一口接主机，都是4号指示灯亮。
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