SPECIFICATIONS > Full Compliance With USB 1.1 Specification > Data Modem With Receive Rates Up To 56Kbps And Send Rates Up To 48Kbps (V.92 Mode) Or Up To V.43 Rates (V.90 Mode) > ITU-T V.92, V.90. K56flex, V.34, V.32, V.22 bis, V.22, V.23 And V.21; V.23 And V.21; Bell 212A And Bell 103 > PCM Upstream; Quick Connect > Data Compression And Error Correction > V.44 Data Compression For Optimal Download Of Internet Web Pages > Fax Modem With Send And Receive Rates Up To 14.4Kbps V.17, V.29, V.27 Ter, And V.21 Channel 2 EIA/TIA 578 Class 1 And T.31 Class 1.0 Commands > Suspend/Resume > Telephony/TAM, 8bit U-Law/A-Law Coding (G.711) And 8-bit/16bit Linear Coding 8KHz Sample Rate > OS Support: Windows98/Me/2000/XP/Vista FEATURES > Full Speed (12 MHz) USB Interface Device > Bus Powered > Plug And Play > V.250 and V.251 Commands