USRobotics USR5638, 56 Kbit/s, RJ-11, V.92, V.90, V.34, V.32bis, V.32, AC, PCI Express slot, Windows Server 2003/Server 2008/XP/Vista/7
USRobotics USR5638. Modem speed: 56 Kbit/s, Interface: RJ-11. Supported protocols: V.92, V.90, V.34, V.32bis, V.32. Power supply type: AC. Minimum system requirements: PCI Express slot, Compatible operating systems: Windows Server 2003/Server 2008/XP/Vista/7. Compliance certificates: Federal Communications Commission (FCC), Certification: FCC, IC