Lenovo N500 Notebook - Manuel (Page 42)

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Dynamic Frequency Selection (DFS)
This device must be used with Access Points that have employed and
activated a radar detection feature required for European Community
operation in the 5GHz bands. This device will operate under the
control of the Access Point in order to avoid operating on a channel
occupied by any radar system in the area. The presence of nearby
radar operation may result in temporary interruption of operation of
this device. The Access Point's radar detection feature will
automatically restart operation on a channel free of radar. The User
may consult with the local technical support staff responsible for
Wireless LAN Network to ensure the Access Point device(s) are
properly configured for European Community Operation.