Conceptronic USB ADSL MODEM ANNEX B, 8000 Kbit/s, Downstream data rate up to 8 Mbps, upstream up to 1 Mbps, PPoA, PPPoE, IpoA and Multi protocol over ATM, Windows 98/ME/XP and 2000, 1 x USB 1 x ISDN (RJ-45) Conceptronic USB ADSL MODEM ANNEX B. Modem speed: 8000 Kbit/s. Supported data transfer rates: Downstream data rate up to 8 Mbps, upstream up to 1 Mbps, Data link protocols: PPoA, PPPoE, IpoA and Multi protocol over ATM. Compatible operating systems: Windows 98/ME/XP and 2000. I/O ports: 1 x USB 1 x ISDN (RJ-45)