Basic Lan Troubleshooting; Troubleshooting Guidelines; Lan Driver Placement In Autoexec.bat; Forcing Full-Duplex Mode - 3Com 3CCFEM556 User Manual

Basic LAN Troubleshooting

Troubleshooting Guidelines

Also, if you removed the card or shut down your computer
while diagnostics were running, you must remove and
reinstall the card using the procedures described in
"Removing and Reinstalling LAN+Modem Card"on
page 52.

LAN Driver Placement in AUTOEXEC.BAT

Some computers start Windows upon startup. If the
commands Setup added to your AUTOEXEC.BAT file do not
run until you exit Windows, check the position of the
commands in the AUTOEXEC.BAT file. You may have to
move the WIN or WIN.COM command that starts Windows
to the end of the file. Save the file and reboot your
machine.

Forcing Full-Duplex Mode

The LAN+Modem card auto-selects full- or half-duplex
operation. On NWay repeaters and switches using
full-duplex transmission, it configures itself for full-duplex
operation.
However, if you connect to non-NWay repeaters or
switches with full-duplex support, you must use CONFIG
to set the card for full-duplex operation.

1 Run CONFIG.

2 From the Main Menu, select Configuration and
Diagnostics Program.
3 Select Configure NIC.
4 Select Full Duplex.
5 Select Forced Full Duplex.
Check the card installation by reviewing Chapter 2.
Inspect all cables and connections.
Make sure you are running the latest BIOS for your PC.
Try a different LAN+Modem card in the same computer.
Try the LAN+Modem card in another computer.
Basic LAN Troubleshooting 59