Paradyne Comsphere 3830 User Manual page 84

COMSPHERE 3800 Series Modems – Model 3830
Symptom
Modem does not go
off-hook and begin
dialing (continued)
Modem dials but does
not connect
Intermittent disconnects,
high error rates, or
excessive
retransmissions
Modem establishes and
disconnects a call
A-6
Table A-3
(3 of 4)
Modem – VF Connection
If using V.25 bis HDLC, verify that the correct
character format uses flag, address, and
control characters before the text block and a
frame sequence check and flag after the text
block.
If the modem is operating behind a PBX, verify
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 or Disconnect and the other modem is
configured for no Error Control. Try calling in
Buffer mode.
If both modems use V.32 bis or V.32
modulation, set the modem's V.32 bis Train
configuration option to Long.
Use the &T7 command to perform a remote
digital loopback test with pattern test.
You may have a poor VF connection.
Disconnect and dial again.
The remote modem may have encountered an
EC Disconnect, where the modem is
configured to establish a call using error
correction.
If the modems cannot negotiate EC, then a
disconnect occurs.
November 1996
Action
3830-A2-GB91-20