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Radio QoS Policy
Altitude
TM
4000 Series Access Point System Reference Guide
267
The Radio QoS Policy screen displays the WMM tab by default. Use the WMM tab to define the
access category configuration ( CWMin , CWMax , AIFSN and TXOP values) in respect to the type of
wireless data planned for this new or updated radio QoS policy.
4 Set the following Voice Access settings for the Radio QoS policy:
Transmit Ops Use the slider to set the maximum duration a device can transmit after
obtaining a transmit opportunity. When resources are shared between a
Voice over IP (VoIP) call and a low priority file transfer, bandwidth is
normally exploited by the file transfer, thus reducing call quality or even
causing the call to disconnect. With voice QoS, a VoIP call (a real-time
session), receives priority, maintaining a high level of voice quality. For
higher-priority traffic categories (like voice), the Transmit Ops value
should be set to a low number. The default value is 47.
AIFSN Set the current AIFSN value between 1-15. Higher-priority traffic voice
categories should have lower AIFSNs than lower-priority traffic
categories. This will cause lower-priority traffic to wait longer before
attempting access. The default value is 1.
ECW Min The ECW Min is combined with the ECW Max to create a contention
value in the form of a numerical range. From this range, a random
number is selected for the back off mechanism. Lower values are used
for higher priority traffic. The available range is from 0-15. The default
value is 2.
Power Save The ECW Max is combined with the ECW Min to create a contention
value in the form of a numerical range. From this range, a random
number is selected for the back off mechanism. Lower values are used
for higher priority traffic. The available range is from 0-15. The default
value is 3.