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COMSPHERE 3800 Series Modems – Model 3830
A-6 August 1998 3830-A2-GB91-30
Table A-3
(3 of 4)
Modem – VF Connection
Symptom Action
Modem does not go
off-hook and begin
dialing (continued)
If using V.25bis 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.
Modem dials but does
not connect
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.32bis or V.32
modulation, set the modem’s V.32bis Train
configuration option to Long.
Intermittent disconnects,
high error rates, or
excessive
retransmissions
Use the &T7 command to perform a remote
digital loopback test with pattern test.
Modem establishes and
disconnects a call
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.