We are using this AP, AIR-LAP1142N-A-K9 and WLCs at v126.96.36.199. We use WPA2 w/AES and TKIP. We never see more than a 54 Mbps link. Even within a few feet of the AP. We had an Aruba controller and the same clients reported 270 Mbps. Is there an issue with this system not doing 802.11n speeds?
Do you have 802.11n enabled? Click on the Wireless tab in the GUI, then use the links on the left to navigate to the 802.11b/g/n and 802.11a/n network pages. Make sure the 802.11n option is checked on these pages.
Seeing from another post that there is a step by step How-to. One of the steps says that 802.11a must be disabled first. Also not sure if this can be done exclusively by the web interface. This doc trys to show both ways.
I got this working, the network utility shows 270 and the WL:C shows me as an "N" connection. WMM is on default of "allowed". My MAC laptop doesn't let me select a/b/g so this SSID is for A network only. This SSID is WPA2, AES only.
config 802.11a disable
config 802.11a 11nsupport enable
config 802.11a 11nSupport a-mpdu tx priority all enable (We are not using QoS)
config 802.11a 11nSupport mcs tx 15 enable
config 802.11a enable
It seemed that I had to reboot the WLCs to get N to work.