Ralink 150N wireless adapter User Manual page 54

In 'WMM Setup Status' block, current WMM settings will be displayed.
And here are descriptions of every setup item:
Item Name
WMM Enable
WMM - Power
Save Enable
Direct Link Setup
Enable
Description
Check this box to enable WMM function. Please
click 'Apply' button on the right of this check box
after you check or uncheck this box, so
corresponding settings in this window will be
activated or deactivated respectively.
Check this box to enable WMM power saving
mode to save energy, and let your computer's
battery live longer.
You also have to select WMM power save modes
here:
AC_BE: Best Performance
AC_BK: Worst Performance
AC_VI: Video data has priority
AC_VO: Voice data has priority
If you have another WMM-enabled wireless
device, you can enter its MAC address here, then
click 'Apply' button, and this network card will
establish a direct link to the wireless device you
specified here.
You also have to specify the timeout value of this
directly-linked wireless device. Valid values are
from 1 to 65535 (seconds), and input '0' for
infinity.
If you want to remove a specific wireless device
from direct link table, select the device and click
this button to remove it.
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