TRENDnet TFM-560E, User Manual

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There may be a problem with the remote modem if
you do not hear the high pitched tone from the remote
modem.
Occasionally, the modem gives a burst of errors.
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The telephone line may be noisy or bad.
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Hang up the call and try to connect again for getting a
better telephone line.
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If there are other telephones on the same line that
your modem is using, someone may have picked up a
telephone on that extension.
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Your telephone line may have the call waiting feature.
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Try adding '*70,' to your ATDT dialing command line. If
it doesn’t help, ask your telephone company how to
disable it temporarily.
The modem gets errors in transmitted data randomly.
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Try to use V.42 or MNP1-4 if possible.
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Connect the modems at a slower baud rate.
After you download a file, it was not stored on your
disk drive.
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If both modems are using MNP or V.42 protocol, then
the flow control may not be enabled.
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Configure your software to use RTS/CTS flow control.
That will cause your computer to pause long enough
for the file to be stored to disk.
The text on the screen is not legible.
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Your software settings may not match the settings on
the remote site.
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Make sure your data bits, stop bits, and parity settings
match the settings that the other computer is using.
The two most common settings are: 8 data bits, None
parity, and 1 stop bit (8,N,1) or 7 data bits, Even
parity, and 1 stop bit (7,E,1).
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If the telephone line is very noisy, you may see
corrupted data on your screen.