3Com Megahertz Series User Manual page 41

Modem cannot connect
to remote access server.
Modem does not fax
Modem does not
connect
"No Dial Tone" Message
"Digital Line Error"
Message
Modem clicks
repeatedly, but no
connection is made
When connecting to a remote access server running V.34 protocol
(up to 33.6 Kbps) with devices such as 3Com AccessBuilder,
configure your DUN settings to reflect the connection speed. We
recommend 19200 or 38400 Kbps. Settings of 57600 or 115200
Kbps will cause a failure.
Make sure you have selected the correct fax class.
Make sure that you do not have another communications program
open.
Be sure you selected the correct printer driver in your word
processing program.
Turn off all power management.
Make sure the parity, modem speed, word length, and stop bits are
set up according to specifications.
Try removing all of the error correction and data compression.
Check all the cable connections and make sure they are secure. The
connection to the phone line could be incomplete, or the phone
cable could be bad.
Make sure the telephone line you are using is not in use by
someone else.
Check to make sure you are using a standard analog telephone
line. If you are trying to connect to a digital phone system or a PBX,
you may receive an error message.
Make sure the phone line is in working order by connecting a
standard telephone and listening for a dial tone.
You are trying to connect to a digital phone system or a PBX.
Change lines to connect to a standard analog telephone line.
You are trying to connect to a digital phone system or a PBX.
Change lines to connect to a standard analog telephone line.
Ordinarily, you would get a DIGITAL LINE ERROR message, but if
the current is under 100mA, the modem will click repeatedly but
the message will not appear.
The cable may not be seated securely. Check both cable
connections to the modem and to the phone jack or cellular phone.
Tip and Ring may be reversed. Try another telephone port.
Modem Troubleshooting 35