A-7
Issue 3 April 1994
Table A-3. Modem — Telephone Line Connection (4 of 5)
S
Action
Symptom
CONNECTION PROBLEMS —
Dial Environments in Originate mode
Modem dials
but does not
connect
If the modem is operating behind a PBX,
determine if a 9 and comma are needed before
the telephone number.
Verify whether Tone or Pulse dialing is needed.
Verify if one modem is configured for error
control/disconnect (\N2, \N4, \N6, \N7) and the
other modem is configured for no error control.
Try calling in Buffer mode (\N0).
If both modems use V.32 bis or V.32
modulation, set the modem’s V.32 bis Train
configuration option (S-Register 43) to Long (0).
Intermittent
disconnects,
high error rates,
or excessive
retransmissions
Use the &T7 command to perform a remote
digital loopback test with pattern test.
Perform a self-test using the AT&T9 command.
Perform a local analog loopback with a Pattern
test.
If the modem passes the above tests and a
problem still exists, then the problem is likely not
with your modem.
High error rates
occur when
running a local
loopback or
self-test
Incoming rings can cause data errors during a
loopback test. Abort the test, disconnect the
modular telephone cord, and restart the test.
