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I have been deploying a new wireless network using 5508 WLC (running 7.0.98) and 3502 APs.
I followed the configuration guide found on:
When I try to chek my access-points, maximum speed supported seems to be 54Mbps.
Testing the same client on a standalone AP configured for 802.11n shows 144 Mbps.
WMM was not enabled.