The EIP provides six high-speed AUI (10 Mbps) ports. Each port on the EIP supports both Ethernet Version 1 and IEEE 802.3/Ethernet Version 2 interfaces. Each Ethernet port requires an Ethernet transceiver or a media attachment unit (MAU) and a transceiver cable or attachment unit interface (AUI) to connect to the external network. The EIP firmware (microcode), which contains card-specific software instructions, resides in a ROM in socket U101.