Because Wireless LAN
In some situation or environment, the use of Wireless LAN
vUsing the integrated wireless cards on board of airplanes, or in hospitals
vIn any other environment where the risk of interference to other devices or services is perceived or identified as harmful.
If you are uncertain of the policy that applies on the use of wireless devices in a specific organization (e.g. airport or hospital), you are encouraged to ask for authorization to use Wireless LAN
Authorized Operation Within the United States and Canada
The statement below regarding the extended channel mode is applicable when the system supports this function. To check the support of this function, please see the property of the installed wireless card by referring to the extended channel mode enablement instruction.
For systems with 802.11b wireless function supporting Extended Channel Mode:
This device may only be used with Access Points, which are authorized for use within the geography in which they are being used. The use of this device with an Access Point that is not
“Extended Channel Mode” should only be selected when the device is operated outside the USA and Canada to avoid the unlikely possibility of unauthorized operation. The use of this device outside the United States and Canada in “Extended Channel Mode” may use frequencies not authorized for use in the United States and Canada. When used with an authorized Wireless
48ThinkPad® T40 Series Service and Troubleshooting Guide