Manually setting radio mode on EAP225
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It has been replaced by much finer control under advanced features »802.11 Rate Control«.
The image below shows the controls for the 2.4 GHz radio. There are similar controls for the 5 GHz radio:
Don't do this if there are other (foreign) networks around yours. Disabling 802.11a will cause the AP to unset certain compatibility bits in 802.11n mode which might confuse other 5 GHz wireless networks still using 802.11a mode by falsely recognizing a radar detection pattern on a DFS channel.
What's more, certain CSMA/CA techniques of your AP won't work anymore if you turn off 802.11a and 802.11n while other networks around still use those modes. Your AP could not detect if another AP using 802.11a mode did acquire a shared channel.
Leaving 802.11a mode enabled does not degrade performance if you don't have 802.11a devices connecting to it. If you have such devices, it should be left enabled anyway.
If your network is the only one around (e.g. in a rural area), then disabling older modes can improve things a little bit, but not much.
A much better way then turning off those modes completely is to increase the lower rate limit for clients and for the beacon like it can be done in SDN Controller. This way, older clients can't connect, but the WiFi mode compatibility settings are still in effect.
