1 x rj45 port connection via rj45 cat5e stputp cable or higher 1 lane 2 5 gb s pci express pci e compatible with pci express specification rev 10a crossover detection auto correction auto negotiation full duplex 202002000 mbits includes led display of network activities 2 rear brackets included for standard low profile slots operating systems windows 20032008 xpvista78server microsoft ndis2 ndis5 2 rear brackets included for standard low profile slots