Additional Compatibility Features
ITU-T V.32, 9600 bps, synchronous, asynchronous, Trellis Coded Modulation (TCM); 4800 bps, synchronous, asynchronous, Quadrature Amplitude Modulation (QAM)
ITU-T V.25 2100 Hz tone
ITU-T V.23, 1200 bps, asymmetrical (1200/75 bps), Frequency Shift Keying (FSK)
ITU-T V.22 bis, 2400 bps, synchronous/asynchronous,
Quadrature Amplitude Modulation (QAM)
ITU-T V.22, 1200 bps, synchronous/asynchronous, Differential Phase Shift Keying (DPSK)
Bell 212A, 1200 bps, synchronous/asynchronous, Differential Phase Shift Keying (DPSK)
Bell 103, 300 bps, asynchronous, Frequency Shift Keying (FSK)
ITU-T V.21, 300 bps, asynchronous, Frequency Shift Keying (FSK)
Error Control Standards
ITU-T V.42 error control protocol at 14.4K, 12K, 9600, 7200, 4800 bps (V.32 bis mode) and at 2400/1200 bps
U.S. Robotics HST error control protocol, asymmetrical mode, at 16.8K, 14.4K, 12K, 9600, 7200, 4800 bps, 450/300 bps back channel
Microcom Networking Protocol (MNP) error control protocol, Levels 2-4 at 14.4K, 12K, 9600, 7200, 4800 bps (V.32 bis mode) and at 2400/1200 bps
Data Compression Protocols
ITU-T V.42 bis data compression (all modes and speeds of 1200 bps and higher)
Microcom Networking Protocol (MNP) Level 5 data compression (all modes and speeds of 1200 bps and higher)
