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7 Solving Problems
111
Data Is Being Lost
If you are using data compression and a high speed serial port, set
the serial port baud rate to four times the data rate.
Your UART might not be reliable at serial port speeds over 9600 bps
or 19,200 bps. Turn off data compression, reset your serial port
speed to a lower rate, or replace your serial port with a faster one.
Make sure the flow control method you selected in software match-
es the method selected in the modem. If you have a Macintosh, you
might have the wrong cable for hardware flow control.
If you are running under Windows 3.1 and have a 16550AFN UART,
you might need to turn on the 16550’s data buffers and/or replace
the Windows serial driver, COMM.DRV.
Try entering the I11 ommand in online mode to display diagnostic
information, making a screen print of the diagnostics listing, and
checking for parameters that might be unacceptable (number of re-
trains, round trip delay, etc.).
There Are Garbage Characters on the Monitor
Your computer and the remote computer might 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 might be experiencing line noise. Enable error correction, if it is
disabled, or hang up and call again; you might get a better connection
the second time.
At speeds above 2400 bps, the remote modem might not use the
same transmission or error correction standards as your modem. Try