Common
Media-independent interface
Type of computer networking connection
Media-independent interface
The media-independent interface (MII) was originally defined as a standard interface to connect a Fast Ethernet (i.e., 100 Mbit/s) medium access control (MAC) block to a PHY chip. The MII is standardized by IEEE 802.3u and connects different types of PHYs to MACs. Being media independent means that different types of PHY devices for connecting to different media (i.e. twisted pair, fiber optic, etc.) can be used without redesigning or replacing the MAC hardware. Thus, any MAC may be used with any PHY, independent of the network signal transmission medium. The MII can be used to connect a MAC to an external PHY using a pluggable connector or directly to a PHY chip on the same PCB. On older PCs, the CNR connector Type B carried MII signals. Network data on the interface is framed using the IEEE Ethernet standard. As such it consists of a preamble, start frame delimiter, Ethernet headers, protocol-specific data and a cyclic redundancy check (CRC). The original MII transfers network data using...
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