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AP-51xx Access Point Product Reference Guide 5-44
9. Click Apply to save any changes to the New QoS Policy or Edit QoS Policy screen to return
to the Quality of Service Configuration screen. Navigating away from the screen without
clicking Apply results in all changes to the screens being lost.
10. Click Cancel to securely exit the New QoS Policy or Edit QoS Policy screen to return to the
Quality of Service Configuration screen.
11. Click Logout within the Quality of Service Configuration screen to securely exit the access
point Symbol Access Point applet. A prompt displays confirming the logout before the applet
is closed.
U-APSD (WMM Power Save) Support
The access point now supports Unscheduled Automatic Power Save Delivery (U-APSD), often referred
to as WMM Power Save. U-APSD provides a periodic frame exchange between a voice capable MU
and the access point during a VoIP call, while legacy power management is still utilized for typical
data frame exchanges. The access point and its associated MU activate the new U-APSD power save
approach when a VoIP traffic stream is detected. The MU then buffers frames from the voice traffic
stream and sends a VoIP frame with an implicit "poll" request to its associated access point. The
access point responds to the poll request with buffered VoIP stream frame(s). When a voice-enabled
MU wakes up at a designated VoIP frame interval, it sends a VoIP frame with an implicit "poll" request
to its associated access point. The AP -5131 responds to the poll request with buffered VoIP stream
frame(s).
NOTE The access point ships with the U-APSD feature disabled by default. It is
automatically enabled when WMM is enabled for a WLAN. Thus, U-APSD
is only functional when WMM is enabled. If WMM is disabled, then
U-APSD is disabled as well.