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The Uni-N IC includes an Ethernet media access controller (MAC). As a separate I/O channel on the Uni-N IC, it can operate at its full capacity without degrading the performance of other peripheral devices. The Uni-N IC provides DB-DMA support for the Ethernet interface.
The MAC implements the link layer. It is connected to a pair of PHY interface ICs: one operates in 10-BaseT mode, the other in 100-BaseT or 1000-BaseT mode. The operating speed of the link is automatically negotiated by the PHY ICs and the bridge or router to which the port is connected. For information about the port, see Ethernet Port .