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22 Quick Start and Reference Guide
Note 1: The first two lines in the table are likely to be
the most valuable.
Note 2: In the command strings shown in the table that
follows, the character after “N” is zero, not the
letter “O.”
Note 3: Some commands vary because of the processor
used in the faxmodem. The use of Lucent- or
Rockwell-based processors is indicated on the
faxmodem box. You can also find out the proc-
essor type in a terminal emulator program by
typing ATI3 and pressing Enter. If the result-
ing response contains 207, the processor is Lu-
cent-based; if the response contains 201, the
processor is Rockwell-based.
To force the different communication speeds
(speeds are maximums; actual speed depends
on line conditions and other factors)
Type these commands and
press Enter
Negotiate speed and protocol
(default setting)
AT &F
Negotiate speed only, do not use protocol
AT \N0
To force protocol
AT \N3
Lucent Rockwell
Dualmode (V.90 or K56flex)—56000 bps
AT S109=1
(default)
(default)
K56flex only (disable V.90)—56000 bps
AT S109=0 AT +MS=56,0
V.90 only (disable K56flex)—56000 bps
AT S109=2 AT +MS=12,0
Disable V.90 and autorate on V.34—33600 bps
AT S38=0
V.34—33600 bps
AT S37=19 AT +MS=11
V.32bis—14400 bps
AT S37=11 AT +MS=10
V.32—9600 bps
AT S37=9 AT +MS=9
2400 bps
AT S37=6 AT +MS=2
1200 bps
AT S37=2 AT +MS=1