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Modulation
This modulation
x2
ITU-T V.34
V.FC
V.32 terbo
HST
ITU-T V.32 bis
ITU-T V.32
ITU-T V.22 bis
Bell 212A
ITU-T V.23
Bell 103
B-2
Supports
Up to 56 kbps downstream and V.34 speeds upstream
33.6/31.2/28.8/26.4/24/21.6/19.2/16.8/14.4/12 kbps;
9600/7200/4800 bps asynchronous Trellis Coded Modulation
(TCM)
28.8/26.4/24/21.6/19.2/16.8/14.4 kbps asynchronous TCM
21.6/19.2/16.8/14.4/12 kbps; 9600/7200 bps asynchronous
TCM; 4800 bps asynchronous Quadrature Amplitude
Modulation (QAM)
16.8/14.4/12 kbps; 9600/7200 bps asynchronous,
asymmetrical, 450 bps back channel with automatic handshake
adjustment to 300 bps TCM and QAM; 4800 bps
asynchronous, asymmetrical, 450 bps back channel with
automatic handshake adjustment to 300 bps QAM.
14.4/12 kbps; 9600/7200 bps asynchronous TCM; 4800 bps
asynchronous QAM
9600 bps asynchronous, TCM; 4800 bps asynchronous, QAM
2400 bps asynchronous, QAM
1200 bps (also V.22) asynchronous, Differential Phase Shift
Keying (DPSK)
1200 bps asymmetrical with 75 bps back channel with
Frequency Shift Keying (FSK), used by some U.K. and
European phone systems.
300 bps (ITU-T V.21 optional) asynchronous, Frequency Shift
Keying (FSK)
Courier I-modem Getting Started Guide
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