I have deployed a WLAN utilising 9 1142 N AP's controlled by a 4404 WLC. The system works fine at 2.4Ghz, but for the life of me I cannot get a connection at 5Ghz using 802.11N. The a/n radios appear to be enabled, I have followed the info in the 1140 deployment guide. Currently running 18.104.22.168 on the WLC and my clients are using the Intel WiFi Link 5100 AGN chipset.
Clients using the Intel 2915ABG can connect at 802.11a 5Ghz seemingly O/K.
Any suggestions appreciated.