3Com U.S. Robotics 56K Voice, Command Reference Manual

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E-2 A
PPENDIX
E: T
ECHNICAL
I
NFORMATION
Error Control, Data
Compression, Testing,
and Dialing
Fax Your Business Modem provides Group III
-
compatibility when controlled
by Class 1 or Class 2.0 fax software. In addition, your Business Modem
adheres to the following standards:
ITU-T V.23 1200 bps asymmetrical with 75 bps back channel with
Frequency Shift Keying (FSK), used by some U.K. and
European phone systems.
Bell 103 300 bps (ITU-T V.21 optional) asynchronous, Frequency
Shift Keying (FSK)
This modulation Supports
This Supports
ITU-T V.42 LAPM error control, 1200 bps and higher
MNP Levels 2, 3 and 4 error control, level 5 data compression,
1200 bps and higher
HST Asymmetrical mode, at 16.8/14.4/12 kbps; 9600/
7200/4800 bps, 450/300 bps back channel
ITU-T V.42 bis Data compression, 1200 bps and higher
ITU-T V.54 Digital and remote digital loopback testing
This Supports
TIA/EIA-578 Service Class 1 Asynchronous Facsimile DCE Control
Standard
TIA/EIA-592 Service Class 2.0 Asynchronous Facsimile DCE Control
Standard
ITU-T V.17 14.4/12 kbps
ITU-T V.29 9600/7200 bps
ITU-T V.27 ter 4800/2400 bps
ITU-T V.21 300 bps