ethtool说eth0使用MII但使用双绞线


9

ethtool表示“支持的端口:[TP MII]”和“端口:MII”。我猜TP意味着双绞线和媒体独立接口。但是从物理上我看到网卡使用双绞线电缆,而不是此MII连接器。那么如何解释呢?

Answers:


14

所有现代以太网芯片都内置了MAC,并在GMII,RGMII或SerDes物理端口上使用MII协议与PHY设备进行通信(即使它是内置的,通常也是如此)。如果要使用双绞线接口,则信号将从PHY穿过一组变压器进入RJ-45连接。

+-------+   +-------+   +-------+       +-------+    +-------+   +-------+
|       |   |       |   |       |       |       |    |       |   |       |
|Host   |<--+       |<--+       |<------+       |<---+       |<--+       |
|Ctrl   |   | FIFOs |   |  MAC  |  MII  |  PHY  |    |Xformer|   | RJ-45 |
|uC     +-->|       +-->|       +------>|       +--->|       +-->|       |
|       |   |       |   |       |       |       |    |       |   |       |
+-------+   +-------+   +-------+       +-------+    +-------+   +-------+
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