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6
TROUBLESHOOTING
The table below lists symptoms of common problems, possible causes, and possible solutions. For additional
troubleshooting information, refer to the User Guide located on the 3Com Companion Programs CD-ROM. For FAQs and
other technical notes, refer to the LAN Modem web site at: http://www.3com.com/support/docs/lanmodem/
Symptom Possible Cause Solution
Web browser does not
start (the welcome
message does not
appear).
Web browser needs the IP
address of the LAN Modem;
or the browser is not set to a
default start page
1 Enter the following URL in your Web browser: http://3com.oc.lanmodem. Alter-
natively, you can enter
http://192.168.1.1.
Incompatible IP address on
your computer.
2 Run the EZ-LAN Wizard, or refer to Chapter 3 of the User Guide.
3 Reset the IP address on your computer, as follows:
Windows 95 and 98: Run winipcfg.exe. Select the Ethernet adapter connected to the Dual
56K LAN Modem. Click Release All and then Renew All.
Windows NT 4.0/2000: Run
ipconfig /release and then ipconfig /renew.
Macintosh: From Apple menu, select Control Panels; then TCP/IP. In the Connect via field, make
sure Ethernet is selected. In the Configure field, select Using Bootp Server to clear the fields. Close
and save changes. Re-open the TCP/IP control panel, and select Using DHCP Server. The fields
should now read <will be supplied by server>. Select File, then Close, saving changes.
Web browser may be
configured to use a proxy
server.
Set the browser to use the LAN Modem, as follows:
Internet Explorer: From the View menu, choose Internet Options. Click the Connection tab.
Uncheck the box labeled Connect using Proxy server.
Netscape: From the Edit menu, choose Preferences. Under Advanced, choose Proxies. Check the
box labeled Direct Connection to the Internet.
There is a configuration
problem.
Reset the Dual 56K LAN Modem to the factory default setting as follows:
Press and release the reset button located on the back of the unit. The Alert LED will begin to
flash. While the LED is still flashing, press and continue to hold in the reset button on the back
of the unit. (You must continuously hold the reset button through three cycles of LED
flashing: Reset, Firmware Download Mode, and Factory Default Reset.) After the ALERT LED
has flashed for the third cycle, you have successfully reset the LAN Modem back to factory
defaults. Release the reset button.
The LAN Modem reinitializes itself and is reset to the factory defaults. All user-entered information
will be erased. Restart your computer and launch your Web browser.
At installation, LAN LED
does not light up.
Wrong cable used to connect
your computer to the LAN
Modem’s LAN port.
Make sure you are using the RJ-45 to RJ-45 cable labeled Ethernet which was provided with your
Dual 56K LAN Modem. If you are using another 10BASE-T Ethernet (Category 5) cable, it must be a
straight-through cable.
At installation, ALERT
LED remains lit.
An internal failure. Notify your reseller or technical support that the Dual 56K LAN Modem has failed the self-test.
At installation, ALERT
LED continues to flash.
Self-test failure, or LAN
Modem is in firmware
download mode
Power-cycle the Dual 56K LAN Modem. If the ALERT LED continues to flash, the Dual 56K LAN
Modem has failed the self-test. Contact your reseller or technical support. If the ALERT LED is not
flashing, then the LAN Modem is now operating correctly.
No dial tone when
handset of a phone
attached to unit is lifted.
Telephone line cables, power
cable, and/or phone cables
may not be firmly connected.
Check all cables and connectors to ensure that they are inserted securely.
Telephone line cables may
not be in the correct ports.
Ensure that the incoming analog telephone line cables have been connected to the ports labeled
LINE 1 and LINE 2 on the Dual 56K LAN Modem’s back panel. If using a single analog line, connect
to Line 1.
Data call may be in progress. Disconnect any data calls currently in progress.
Cannot place test call to
the Internet
ISP not properly configured. Confirm your ISP connection settings, such as Username, Password, and telephone number. Follow
steps 7-11 on page 4.
Phone line not connected. Check all cables and make sure that telephone line is connected to the Line 1 port.
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