The MGX-RJ45-4E/B back card provides up to four IEEE 802.3 Ethernet 10BaseT interfaces.Ethernet is commonly used for all carrier sense multiple access/collision detection (CSMA/CD) local-area networks (LANs), which generally conform to Ethernet specifications, including IEEE 802.3 Ethernet Version 1 and IEEE 802.3 Ethernet Version 2. The slight differences between Ethernet and IEEE 802.3 are implemented in the hardware, and both are supported automatically by the Ethernet 10BaseT back card without any hardware configuration changes. Together, Ethernet and IEEE 802.3 are the most widely used LAN protocols, because they are well suited to applications where a local communication medium must carry sporadic and occasionally heavy traffic.