The Adapter, XM-NA3840 is a highly integrated and cost-effective Quad Gigabit PCIe Ethernet Adapter which is fully compliant with IEEE 802.3, IEEE 802.3 u and IEEE 802.3 ab standards. This Quad Gigabit network adapter keep low cost and eliminate usage barriers. It is the easiest way to upgrade a network environment from 10/100Mbps to 1000Mbps. It supports 10/100Mbps network speed automatically both in Half-Duplex and Full-Duplex transfer mode, and 1000Mbps in Full-Duplex transfer mode, by using Auto Negotiation technology to detect the network speed.