The Intel® 82575EB Gigabit Ethernet Controller is a single,
compact component with two fully integrated Gigabit Ethernet
Media Access Control (MAC) and physical layer (PHY) ports. This
device uses the PCI Express* 2.0 (2.5 Gbps) [x2 and x4] interface.
The Intel 82575EB Gigabit Ethernet Controller provides two IEEE
802.3* Ethernet interfaces for 1000BASE-T, 100BASE-TX, and
10BASE-T applications. Both ports also integrate a Serializer-
Deserializer (SerDes) interface to support 1000BASE-SX/LX
(optical fiber), Gigabit Ethernet backplane applications, and
external PHYs connected either on board or via SFP connectors
using SGMII signaling. Intel 82575EB Gigabit Ethernet Controller
provides hardware assists for auto sensing and switching
between copper and SerDes/SGMII interfaces.