2 Port External USB 2.0 USB2.0 3 in 1 Data Fax Voice Dial Up Modem 56K V.92 V.90 CX93010, Receive Send Fax on Your Computer Stable and reliable chipset Conexant 93010. Data Transmission Protocols: ITU V.92, V.90, V.34, V.32bis, V.22bis, V.21, Bell 212A & Bell 103. Fax Transmission Protocols: Group 3, ITU V.17, V.29, V.27ter and V.21 channel 2 modulation modes. Data transfer rate up to 56Kbps download & 48Kbps upload. Fax transfer rate up to 14.4Kbps.