wifi bit rate



Any wifi protocol savvy people who can explain this:

iwconfig wlan0
wlan0 IEEE 802.11bgn ESSID:"Private"
Mode:Managed Frequency:2.452 GHz Access Point: 00:AA:BB:CC:DD:EE
Bit Rate=18 Mb/s Tx-Power=27 dBm
Retry long limit:7 RTS thr=2346 B Fragment thr=2346 B
Power Management:off
Link Quality=70/70 Signal level=-36 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:25 Missed beacon:0

The access point is a 54G wifi gateway and router.

My wifi card is the Atheros AR5008 which is an 802.11n card.

How could the bit rate be restricted to 18Mb/s??
Is this a problem with the ath9k driver or the wext driver?
PS: I did not have the issue until installing FC16. This
problem was absent in FC14.

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