USRobotics V.34 user manual Hst

COURIER HIGH SPEED MODEMS

COMPATIBILITY

The Courier adheres to the following modulation schemes and standards, ensuring compatibility with a wide base of installed modems. Unless otherwise indicated, Dual Standard V.34 modems conform to the listed standards.

NOTE: The International Telecommunication Union (ITU-T) was formerly the International Telegraph and Telephone Consultative Committee (CCITT).

ITU-T V.34

V.FC

V.32 terbo

HST

HST Cellular

ITU-T V.32 bis ITU-T V.32 ITU-T V.22 bis Bell 212A ITU-T V.23

ITU-T V.25

ITU-T V.25 bis

Bell 103 ITU-T V.42 ITU-T V.42 bis

28.8K/26.4K/24K/21.6K/19.2K/16.8K/14.4K/12K/ 9600/7200/4800/2400 bps

28.8K/26.4K/24K/21.6K/19.2K/16.8K/14.4K bps

21.6K/19.2K/16.8K/14.4K/12K/9600/ 7200/4800 bps

16.8K/14.4K/12K/9600/7200/4800 bps (Dual Standard modems in HST mode with ASL up to 21.6K bps)

Cellular connections at 12K/9600/7200/ 4800/2400/1200/300 bps (Dual Standard modems in HST mode)

14.4K/12K/9600/7200/4800 bps

9600/4800 bps

2400 bps

1200 bps (also V.22)

1200 bps with 75 bps back channel (some U.K. and European phone systems)

Answer sequence for calls originating outside the U.S. and Canada

For synchronous communications using HDLC and character-oriented protocols

300 bps (ITU-T V.21 optional)

LAPM error control, 1200 bps and higher

Data compression, 1200 bps and higher

1-6 Features and Compatibility