Per the 7921G Design Guide, only 12.3(8)JEA and later is supported. 12.3(8) supports U-APSD, which is a power save method used by the 7921. We recommend to use 12.3(8)JEA2 for AP1200 series and 12.3(4g)JA1 for AP1130 and AP1240 series. Also some improvements in that version to handle many power save enabled wlan phones.
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