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56K Faxmodem Owner’s Manual
Problem:
Random errors occur or data is missing in
transmitted data.
Solution:
Use the MNP or V.42 protocol if the remote
modem supports one of these protocols. See the
table on page 36 for more information.
Select a lower baud rate in your
communications software and place the call
again.
If both modems are using the MNP or V.42
protocol, the only way this can occur is if your
modem and communications software are not
using the appropriate flow control. Configure
your communications software for RTS/CTS
(hardware) flow control. Your computer will now
pause for the transmission to be stored.
Problem:
Data appears garbled on the screen.
Solution:
Your communications software character setup
(start bit, data bits, stop bits, and parity bit)
does not match that of the remote system.
Check your settings against those used by the
remote system and make sure they match. Pay
particular attention to the parity setting, as this
is the most common difference among systems.
You should normally use 8 data bits, NO parity,
and 1 stop bit (8, NONE, 1). The second most
common setting is 7 data bits, EVEN parity, and
1 stop bit (7, EVEN, 1).
Problem:
Your modem doesn’t seem to be compressing
the data.
Solution:
The compression features are on by default, but
check the following:
Your software needs to use a streaming protocol,
such as Ymodem-G or Zmodem. Xmodem and
Ymodem are not adequate for compression.
Your software must be set up so that your mo-
dem is using hardware flow control (RTS/CTS
ON).
