Multi-Tech Systems MT5634ZBAV - Manual (Page 121)

7 Solving Problems
111
Data Is Being Lost
4
If you are using data compression and a high speed serial port, set
the serial port baud rate to four times the data rate.
4
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.
4
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.
4
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.
4
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
4
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.
4
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.
4
At speeds above 2400 bps, the remote modem might not use the
same transmission or error correction standards as your modem. Try