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Troubleshooting
Table A-4. Connection Problems while Placing a Call (2 of 3)
Symptom
Intermittent
disconnects, high
error rates, or
excessive
retransmissions
High error rates
occur when running
a local loopback or
self-test
Modem does not
receive a dial tone.
NO DIALTONE or
NO CARRIER
message is
displayed.
A-6
Issue 2
Action
If you are using an operating mode that uses flow
control (any \N setting except \N1), make sure
both modems are using the same type of flow
control.
Or, if you are using Direct mode (\N1), make sure
that modem-to-modem flow control is disabled
(\G0).
Use the &T7 command to perform a remote digital
loopback test with pattern test.
Perform a local analog loopback with a Pattern
test (&T8).
Your telephone may have Call Waiting enabled.
Refer to your local phone book for procedures to
disable this feature.
If the modem passes the above tests and a
problem still exists, then the problem is likely not
with your modem.
Incoming rings can cause data errors during a
loopback test. Abort the test, disconnect the
modular telephone cord, and restart the test.
Make sure the telephone cord is connected to the
telephone line connector.
Attach a telephone directly to the wall outlet to
verify that a dial tone exists.
Disable dial tone detection (using X0, X1, or X3)
and dial the telephone number again. This forces
the modem to dial without detecting a dial tone on
the telephone line. This type of dialing is known as
Blind Dialing.
May 1995
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