3Com PC Card User Manual page 57

Modem does not dial
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
Check your phone line and cable connections. See "Installing
and Connecting the Card" on page 1.
Make sure no other phone extension has been picked up on the
same line.
Make sure you are using a standard analog telephone line. You
might receive an error if you are trying to connect to a digital
phone system or PBX.
Listen for a normal dial tone on the line. If the dial tone sounds
different than normal, find another line.
When connecting to a remote access server running V.34
protocol (up to 33.6 Kbps) with devices such as 3Com Access
Builder, 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 53