LAN8831 Gigabit Ethernet Transceivers Microchip Technology LAN8831 Gigabit Ethernet Transceivers with GMII/MII/RGMII are fully integrated triple-speed (10BASE-T/100BASE-TX/1000BASE-T) Ethernet physical-layer transceivers. The devices are designed for transmitting and receiving data on standard CAT-5, CAT-5e, and CAT-6 unshielded twisted pair (UTP) cables.