Cisco 8821 Manual page 51

Frame Aggregation
Frame aggregation is a process of packaging multiple MAC Protocol Data Units (MPDUs) or MAC Service Data Units
(MSDUs) together to reduce the overheads where in turn throughput and capacity can be optimized.
Aggregation of MAC Protocol Data Unit (A-MPDU) requires the use of block acknowledgements.
It is recommended to adjust the A-MPDU and A-MSDU settings to the following to optimize the experience with the Cisco
Wireless IP Phone 8821 and 8821-EX.
A-MSDU
User Priority 1, 2 = Enabled
User Priority 0, 3, 4, 5, 6, 7 = Disabled
A-MPDU
User Priority 0, 3, 4, 5 = Enabled
User Priority 1, 2, 6, 7 = Disabled
In the 7.0.116.0 release for the Cisco Wireless LAN Controller, the default A-MPDU and A-MSDU configuration is the
following.
A-MSDU
User Priority 0, 1, 2, 3, 4, 5 = Enabled
User Priority 6, 7 = Disabled
A-MPDU
User Priority 0, 4, 5 = Enabled
User Priority 1, 2, 3, 6, 7 = Disabled
Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
51