Device Type: ISDN terminal adapters, type: plug-in card Interface Type: PCI Express x1, Connectivity Technology: Wired, Digital Signaling Protocol: ISDN - 2 (NI-2), ISDN 1TR6, DSS1/ETSI ISDN, ISDN Interface: ISDN BRI S0, Protocols & Specifications: ITU T.30, ITU T.70NL, T.90NL ITU, ITU V.110 (I.463), ITU X.25, ITU X.75, HDLC, Data Compression Protocol: MMR, MR, number of digital connections: 2, Features: DTMF decoding, Interfaces: 2 x modem - ISDN BRI S0, Compatible Slots: 1 x PCI Express x1, Cables Included: 2 x modem cable Software Included: Drivers & Utilities OS Required: Linux Microsoft Windows Server 2003, Windows Server 2008, Microsoft Windows 98/2000/XP/Vista/7, Service & Support: 5 years warranty Service & Support Details: Limited warranty - 5 years