Chapter 4: Troubleshooting 29
Another possible problem is that your com-
puter does not have the latest version of Uni-
modem V, a set of drivers required for TAPI
applications. The software that installs your
faxmodem automatically installs the latest ver-
sion of Unimodem V if it is needed. You may
have subsequently installed a communications
package that automatically installs an older
version of Unimodem V. If that is the case,
you can reinstall the newer version of Unimo-
dem V from the CD: Simply insert the CD-
ROM disc and rerun the PCI installation from
the installation interface.
Finally, the modem drivers that were installed
with your PCI faxmodem may have been up-
dated, and the new drivers may work better.
Visit www.modems.com for driver updates.
On-line Troubleshooting
Problem: The modem can connect to some modems,
but not to others.
Solution: A remote modem does not respond because of
the extended negotiation process by which
modems determine the best common connec-
tion between them. If this is the case, 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.
To force the different communication speeds Type these commands and
press Enter
Negotiate speed and protocol
(default setting)
AT &F
Negotiate speed only, no protocol (not recom-
mended)
AT \N0
To force protocol
AT \N3
Dualmode (V.90 or K56flex)—56000 bps
AT S109=1 (default)
K56flex only (disable V.90)—56000 bps
AT S109=0
V.90 only (disable K56flex)—56000 bps
AT S109=2
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