User`s guide

User’s Guide 29
PROBLEM DIAGNOSIS POSSIBLE SOLUTION
Your
communications
software is
reporting many
cyclic redundancy
check (CRC) errors
and low characters
per second (CPS).
Errors are
constantly occurring
in your V.17 fax
transmissions.
If your communications
program is DOS-based,
you are running it under
Windows, at the same time
with other software.
Conflicts between these
programs may be causing
the CRC errors.
Your modem initialization
string could be insufficient
for fax transmissions.
There may be a Terminate
and Stay Resident (TSR)
program (such as a screen
saver or virus scanner)
running in the background,
disrupting data
communications.
You could have an outdated
COM driver on your
system.
Your baud rate may be set
too high.
You may be trying to fax a
compressed file.
Close every program but the
communications program.
Type the following initialization
string in Terminal mode
AT&H3&I2&R2S7=90S and press
ENTER.
Disable any Terminate and Stay
Resident (TSR) programs running
in the background. If you have
software running as a TSR, check
the software’s manual for
information about disabling its ability
to operate as a TSR.
Load the COM driver that came with
your fax software.
Lower baud rate to 9600, 7200, or
4800.
Open the file in the application in
which it was created. Select your
communications software as the
printer and then print the file.
The modem
displays double
characters on your
monitor.
Both the modem’s and
software’s local character
echoes are probably turned
on.
Disable local echo in your software
OR on your modem (not both). You
can turn the local echo off on the
modem by typing ATE0 and
pressing ENTER in your software’s
Terminal Mode. To turn the local
echo off in the software, refer to its
documentation.