Chapter 3 Problems and Solutions
35
Make sure your modem has hung up from the
previous call. Select Hang Up in your software;
or change to terminal mode, wait one second,
type
ATH
and press Enter to hang up the
modem.
On-line Troubleshooting
Problem:
The modem can connect to some modems,
but not to others.
Solution:
If a remote modem does not respond because of
the extended negotiation process, you may have
to disable part or all of the negotiation process.
In the following table, “protocol” means error
correction and data compression. Note that the
first two lines in the table are likely to be the
most valuable.
NOTE: In the command strings shown in the table that
follows, the character after “N” is zero, not the
letter “O.”
To force the different
communication speeds…
Type these
commands and
press Enter
Negotiate speed and protocol
(default setting)
AT &F
Negotiate speed only, do not use
protocol
AT \N0
Connect at 56000 bps (V.34)
AT +MS=56
Connect at 33600 bps (V.34)
AT +MS=11
Connect at 14400 bps (V.32bis)
AT +MS=10
Connect at 9600 bps (V.32)
AT +MS=9
Connect at 2400 bps (V.22bis)
AT +MS=2
Connect at 1200 bps (V.22)
AT +MS=1
Connect at 1200 bps, no protocol
AT \N0 +MS=1
To force Protocol…
AT \N3
To force no Protocol…
AT \N0
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