Extreme Networks Summit WM User Manual page 103

802.11g protection mode must be disabled:
In the 11g Settings section, click None in the Protection Mode drop-down list.
NOTE
Do not disable 802.11g protection mode if you have 802.11b client devices using this Altitude AP; instead,
configure only the 5GHz radio for high throughput (on the 802.11a/n tab) unless it is acceptable to achieve less
than maximum 802.11n throughput on the 2.4GHz radio.
If only 802.11n devices are present, 11n protection and 40Mz protection must be disabled:
Protection Mode - Click Disabled.
40MHz Protection Mode - Click None.
NOTE
Do not disable 802.11n protection mode if you have 802.11b client devices using this Altitude AP; instead,
configure only the 5GHz radio for high throughput (on the 802.11a/n tab) unless it is acceptable to achieve less
than maximum 802.11n throughput on the 2.4GHz radio.
Aggregate MSDUs - Click Enabled.
Aggregate MSDU Max Length - Type 4096.
Aggregate MPDU - Click Enabled.
Aggregate MPDU Max Length - Click 65535.
Agg. MPDU Max # of Sub-frames - Type 64.
ADDBA Support - Click Enabled.
Summit WM User Guide, Software Version 5.3
103