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通过link LED的定义可以看出，不管mode1 还是mode2，LED 正常是亮的，如果mode1 不亮的话，说明没有link好，mode 2 不亮或者闪烁的话，说明只有发送端或者接收端正常的。
LINK LED: In Mode 1, this pin indicates the status of the LINK. The LED will be ON when Link is good.
LINK/ACT LED: In Mode 2, this pin indicates transmit and receive activity in addition to the status of the Link. The LED will be ON when Link is good. It will blink when the transmitter or receiver is active.
