5 Solving Problems
71
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 are using the modem
with 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. (See “The 16550
UART and Windows 3.1” in the MultiModemZDX Help file.)
4
Try entering the L8 (List Online Diagnostics) command in online
mode, making a screen print of the diagnostics listing, and check-
ing for parameters that may be unacceptable (number of retrains,
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 communication soft-
ware.
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 connec-
tion the next time.
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