Don't forget the basics:
Stephen J. Bigelow:
In addition, new wireless devices will invariably require new security
settings. Although there are no new security schemes planned for
802.11n, pre-n devices will still need to be configured with WPA keys
and other security settings to allow operation on your current wireless
network. Before upgrading or replacing any wireless devices, be sure to
check your current security settings so that you can configure any new
pre-n device(s) with a minimum of guesswork.
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