Lenovo ThinkPad T400s series User Manual page 22

Using wireless LAN connections
Your computer comes with a built-in wireless networking card and a configuration utility to help you make wireless connections and monitor the
status of your connection, so that you can stay connected to your network while you are in the office, in a meeting room, or at home, with no
need for a wired connection.
Attention:
If you carry your ThinkPad computer with the wireless LAN feature into an airplane, check the services with the airline before boarding
the airplane.
If there are restrictions on the use of computers on an airplane with the wireless feature, you need to disable it before boarding. To
disable it, refer to the instructions in
Note: You can purchase a wireless networking card as an option. For more information, refer to
Tips for using the wireless LAN feature
Place your computer so that there are as few obstacles as possible between the wireless LAN access point and the computer.
For the best connection of the wireless LAN feature, open your computer display to an angle of slightly more than 90 degrees.
If you use the wireless feature (the 802.11 standard) of your computer simultaneously with a Bluetooth option, data transmission
speed can be delayed and the performance of the wireless feature can be degraded.
Wireless networking setup
Wireless upgradeable ThinkPad models
Enabling or disabling the wireless feature.
Finding ThinkPad options.