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Chapter 5 - Troubleshooting
Getting Garbage Characters on the Monitor
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Your computer and the remote computer may be set to different
word lengths, stop bits, or parities. If you have connected at 8-N-
1, try changing to 7-E-1, or vice-versa, using your communications
software.
•
You may be experiencing line noise. Enable error correction, if it
is disabled, or hang up and call again; you may get a better
connection.
•
At speeds above 2400 bps, the remote modem might not use the
same transmission or error correction standards as your modem.
Try connecting at a slower speed or disabling error correction.
(With no error correction, however, line noise can cause garbage
characters.)
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Try entering the L8 (List Online Diagnostics) command in online
mode, making a screen print of the diagnostics listing, and
checking for parameters that may be unacceptable (number of
retrains, round trip delay, etc.).
Fax and Communications Software Won’t Run atthe Same Time
Communications devices can be accessed by only one application at a
time. Under DOS or Windows 3.1x, you can run either your fax
software or your datacomm software, but not both at the same time,
unless you have a special communications device management
application, such as Multi-Tech’s Virtual Modem Driver. In Windows
95, you can have data and fax communication applications open at the
same time, but they cannot use the same modem at the same time.
In this test, data from your computer or terminal is sent to your
modem's transmitter, converted into analog form, looped back to the
receiver, converted into digital form and then received back at your
monitor for verification. No connection to the phone line is required.
See Figure 6-1 in Chapter 6.