Chapter 4 Problems and Solutions
27
Problem: Your modem disconnects while communicat-
ing with a remote system.
Solution: The remote system has hung up, and you need
to reconnect. The other most common sources
of interruptions are Call Waiting or someone
picking up an extension phone.
If you have Call Waiting, you can usually tem-
porarily disable it by including *70, (including
the comma), or by selecting it as a prefix, in the
software’s dialing directory.
You cannot disable Call Waiting for incoming
calls. If your incoming data calls are frequently
disrupted by Call Waiting, you should consider
dropping the service or installing a separate
phone line without Call Waiting.
Problem: Your modem does not make a connection.
Solution: If your modem places calls but never connects,
make sure you are dialing the right number
and that the remote modem is turned on.
Problem: You receive bursts of errors occasionally, but
otherwise data quality is good.
Solution: The connection may have been established on
poor-quality or noisy telephone lines. Hang up
and place the call again to try to obtain a better
connection.
Someone may be picking up an extension con-
nected to the line that your modem is using. If
your modem is sharing a telephone line with
other telephones, inform the other users when
you will be making a data call, or install a
separate line dedicated to data calls.
Your telephone line may have a Call Waiting
feature and a call is being received. See the Call
Waiting discussion on page 27.
Problem: Random errors occur or data is missing in
transmitted data.
Solution: Use the MNP or V.42 protocol if the remote mo-
dem supports one of these protocols. See the
table on page 26 for more information.
Select a lower baud rate in your communica-
tions software and place the call again.
