Compatible with USB version 1.1 Up to 56 Kbps downloads with ITU V.90 and V.92 ITU V.34 up to 33.6 Kbps Compatible with ITU and Bell standards down to 300 bps V.80 video conferencing support V.42/MNP2-4 error control V.42 bis, V.44, MNP5 data compression Fax: EIA 578 (Class 1) with V.17, V.29, V.27 ter Hot Swap