The D-Link DFE-690TXD is a 32-bit Cardbus 10 / 100 Mbps NWay Fast Ethernet PC Card with a built in RJ-45 connector. It can provide network connectivity for mobile users of notebook or laptop computers with a current Cardbus controller. The IEEE 802.3 and IEEE 802.3u standard which specifies existing 10BASE-T and 100BASE-TX Ethernet technology is adhered to. Two duplex modes are supported with data rates up to 10 / 100 Mbps at half duplex and 20 / 200 Mbps at full duplex. Auto-negotiation is utilized to sense the speed of another auto-negotiating 10BASE-T or 100BASE-TX network connection. Status LED´s show link connectivity for both 10 Link / Activity and 100 Link / Activity.