3Com PC Card manual Modem Troubleshooting

	Modem Troubleshooting 53
Modem does not dial	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.
Modem cannot connect	When connecting to a remote access server running V.34
to remote access server.	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.
Modem does not fax	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.
Modem does not	Make sure the parity, modem speed, word length, and stop bits
connect	are set up according to specifications.
	Try removing all of the error correction and data compression.
No Dial Tone Message	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.
Digital Line Error	You are trying to connect to a digital phone system or a PBX.
Message	Change lines to connect to a standard analog telephone line.
Modem clicks	You are trying to connect to a digital phone system or a PBX.
repeatedly, but no	Change lines to connect to a standard analog telephone line.
connection is made	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.