A Wireless Lan Problem - Lenovo ThinkPad X1 Carbon User Manual

– The switch port and the adapter have the same duplex setting.
If you configured the adapter for full duplex, ensure that the switch port also is configured for full
duplex. Setting the wrong duplex mode can degrade performance, cause data loss, or result in lost
connections.
– You have installed all networking software that is necessary for your network environment.
Check with your LAN administrator for the necessary networking software.
• Problem: The adapter stops working for no apparent reason.
Solution: The network driver files might be corrupt or missing. Update the driver by referring to the above
solution for the procedure to ensure that the correct device driver is installed.
• Problem: If your computer is a Gigabit Ethernet model and you use a speed of 1000 Mbps, the
connection fails or errors occur.
Solution:
– Use Category 5 wiring and make sure that the network cable is securely connected.
– Connect to a 1000 BASE-T hub/ switch (not 1000 BASE-X)
• Problem: If your computer is a Gigabit Ethernet model, it cannot connect to the network at 1000 Mbps.
Instead, it connects at 100 Mbps.
Solution:
– Try another cable.
– Make sure that the link partner is set to auto-negotiate.
– Make sure that the switch is 802.3ab-compliant (gigabit over copper)

A wireless LAN problem

Problem: You cannot connect to the network using the built-in wireless network card.
Solution: Ensure that your wireless LAN driver is the latest version. Check the Web site and confirm that the
driver version supported by the Access Connections program is the latest documented in the readme file.
Ensure that your computer is within range of a wireless access point.
Ensure that the wireless radio is enabled by double-clicking the Access Connections icon on the taskbar.
Note: Click Show hidden icons on the taskbar. The Access Connections icon is displayed. For more
information about the icon, refer to the Access Connections help information system.
Check the Network Name (SSID) and your encryption information. Use the Access Connections program to
verify this case-sensitive information.
A wireless WAN problem
Problem: A message is displayed indicating that an unauthorized WAN card is installed.
Solution: The WAN card is not supported on this computer. Call Lenovo Customer Service Center to
have it serviced
Note: Depending on your computer, some models do not have a wireless WAN card.
90
User Guide