PHY - Physical Interface

The physical layer transceiver which implements the IEEE Ethernet standard interface between the ethernet wires (twisted pair, 50 ohm coax, etc.) and the ethernet controller (MAC). PHYs are often external transceivers but may be integrated in the MAC chip or in the CPU.

The PHY is controlled more or less transparently to software via the MII.

----- Revision r1.2 - 12 Apr 2006 - 14:00 - JerryVanBaren
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