3Com 005683-00 Manual page 66

PROBLEM:
Your modem won't connect at 2400
bps with a 2400 bps m odem.
Diagnosis:
The modem you're trying to connect with
could be an older model that doesn't support
error control.
Possible Solution:
You can disable error control on your modem
by typing AT&M0 in terminal mode and
pressing ENTER. Now try placing the call to
the remote modem again. When finished, reset
your modem to enable the error control
features. In terminal mode, type ATZ and
press ENTER.
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ROUBLESHOOTING AND
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NLINE ELP ESOURCES
NOTE:
ATZ4 or AT&F1 are often the
best reset strings, as they restore
hardware flow control defaults.
PROBLEM:
Your screen keeps displaying random
garbage characters.
Diagnosis:
You could have a conflict with the remote
modem's settings for word length, parity, and
stop bits.