The DFE‎-520TX is a very low‎-cost auto‎-sensing 10/100Mbps dual‎-speed network card installable in a PC equipped with PCI expansion slots‎.‎ This card makes extensive use of the single‎-chip technology and is equipped with an on‎-board FIFO buffer‎,‎ providing your computer with an easy and effective connection to an Ethernet network‎.‎Plugged into your PC‎'‎s PCI expansion bus‎,‎ this network card is automatically configured by the PC BIOS‎.‎ Supporting 32‎-bit Bus Master operation‎,‎ the card provides a guaranteedperformance for your networked PC‎.‎ Bus Master transfers data directly between the card and the PC host‎,‎ bypassing your computer host CPU to alleviate its workload‎.‎ This allows your computer to concentrate on the application at hand‎,‎ instead of the network operation task‎.‎ The card‎'‎s single RJ‎-45 connector connects to either 10BASE‎-T Ethernet or 100BASE‎-TX Fast Ethernet‎.‎  10/100Mbps speeds are auto‎-negotiated‎,‎ completely without your need to intervene‎.‎ In the fast 200Mbps full‎-duplex mode‎,‎ the card‎'‎s embedded flow control provides a means to protect your data against possible loss during transmission on the network‎.‎ When connected to a LAN switch that supports flow control‎,‎ the card receives signals from the switch regarding buffer overrun during peak usage periods‎.‎ The card then delays transmission until the switch is ready again to accept new data‎.‎