802.11g only connecting at 54Mbs (WPA v2)

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I'm trying to set up my fancy new wifi and having problems getting on of the WLANS to get anything more than 54Mb/s. 

It's configured;

WPA v.2 auto encryption
All radios enabled (a/n/ac, g/n)
No CoS
802.1X authentication back to the NAC. 

Any ideas? What am I missing here :/ 

If I create another WLAN with the following I get full speed. 
All radios enabled (a/n/ac, g/n)
No CoS
Auth disabled

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Tom Taylor

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Posted 3 years ago

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Doug Hyde, Technical Support Manager

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Official Response
Set the encryption to WPA2-AES only and make sure WMM is enabled.