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•
Are you downloading a compressed file with MNP 5 hardware
compression enabled? Since hardware data compression cannot
compress a file already compressed by an archiving program, the
transfer can be marginally slower with data compression enabled
than with it disabled. (See "When to Disable Data Compression" in
MultiModemZDX Help.)
•
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.).
I Am Losing Data
•
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 may 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 matches
the method selected in the modem. If you have a Macintosh, you may
have the wrong cable for hardware flow control.
•
If you are running under Windows 3.1 and have a 16550AFN UART,
you may 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.)
•
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.).
Chapter 5 - Troubleshooting
59
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