The Smart MK4 PCI is a fully featured Token Ring Adapter with wide range of Operating System support and Windows XP certification. The Smart MK4 PCI features a high performance PCI bus interface and advanced software support. It is compatible with all the latest PCI-based PC systems and supports automatic detection and selection of the following parameters: 100, 16 or 4 Mbps ring speed, STP or UTP cable, Full Duplex or shared Token Ring connection