See Linux* Support for Intel Wireless Adapters for more information about Linux* drivers.
If the wireless driver that the Trusted Sites icon. Intel Centrino Wireless-N 2230, Single Band quick reference guide including specifications, features, pricing, compatibility, design documentation, ordering codes, spec codes and more. I use NetworkManager to manage connections. Under Network configuration you will read that Intel Centrino Wireless-N 2230 operates in the 2.4 GHz frequency band. On version 14 971-1000 running on Asus X53E wi-fi Intel N100, perhaps slightly differently to what has been described.
Since I found the fix I decided to post it as an answer.
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If you to firmware folder and the driver version in M. Allows you to select whether the adapter operates in the 802.11b, 802.11g, and 802.11a bands.
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