56Kbps PCI Bus (Plug & Play) 2 x RJ11 ports V.92 56K ITU standard V.90 56K ITU standard V.34 33.6K ITU standard Compatible with most ITU and Bell standards down to 300 bps V.80 video conferencing support V.42, MNP2-4 error control V.44, V.42bis, MNP5 data compression Fax: EIA 578 (Class 1) with V.17, V.29, V.27ter