Multitech MultiModem MT5634ZPW-PCI, Owner'S Manual

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MT5634ZPW-PCI
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4 Troubleshooting
The Modem Cannot Connect When
Answering
• Auto-answer may be disabled. Turn on auto-answer in your
data communications program or send the command
ATS0=1 to your modem in terminal mode.
File Transfer Appears Slower Than It
Should Be
• If you are using a slow transfer protocol, such as Xmodem
or Kermit, try Zmodem or Ymodem/G instead.
• Is your line noisy? If there is static on your line, the modem
has to resend many blocks of data to insure accuracy. You
must have a clean line for maximum speed.
• 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.
Data Is Being Lost
• If you are using data compression, be sure the serial port
baud rate is set to a minimum of four times the data rate.
• Make sure the flow control method you selected in software
matches the method selected in the modem. If you are using
CompuServe’s WinCIM software, you must set the modem
for XON/OFF flow control (see Chapter 4 for the
CompuServe initialization string).
• Try entering the
&V (View Parameters) command, making a
screen print of the diagnostics listing, and checking for
parameters that may be unacceptable.