Extreme Networks Summit WM User Manual page 205

802.11e - If enabled, the AP will accept WMM client associations, and will classify and prioritize the
downlink traffic for all 802.11e clients. The 802.11e clients will also classify and prioritize the uplink
traffic.
Turbo Voice - If any of the above QoS modes are enabled, the Turbo Voice mode is available. If
enabled, all the downlink traffic that is classified to the Voice (VO) AC and belongs to that WM-AD
is transmitted by the AP via a queue called Turbo Voice (TVO) instead of the normal Voice (VO)
queue. The TVO queue is tailored in terms of contention parameters and number of retries to
maximize voice quality and voice capacity.
All combinations of the three modes are valid. The following table summarizes all possible
combinations:
Table 24: QoS mode combinations
Legacy mode
WMM mode
Configuration
802.11e mode
To legacy client
From legacy client
Traffic that is
To WMM client
classified and
From WMM client
prioritized
To 802.11e client
From 802.11e client
The APs are capable of supporting 5 queues. The queues are implemented per radio. For example, 5
queues per radio. The queues are:
Table 25: Queues
Queue Name
AC_VO
AC_VI
AC_BK
AC_BE
AC_TVO
The Summit WM Controller supports the definition of 8 levels of user priority (UP). These priority
levels are mapped at the AP to the best appropriate access class. Of the 8 levels of user priority, 6 are
considered low priority levels and 2 are considered high priority levels.
WMM clients have the same 5 AC queues. WMM clients will classify the traffic and use these queues
when they are associated with a WMM-enabled AP. WMM clients will behave like non-WMM clients -
map all traffic to the Best Effort (BE) queue - when not associated with WMM-enabled AP.
The prioritization of the traffic on the downstream (for example, from wired to wireless) and on the
upstream (for example, from wireless to wired) is dictated by the configuration of the WM-AD and the
QoS tagging within the packets, as set by the wireless devices and the host devices on the wired
network.
Both Layer 3 tagging (DSCP) and Layer 2 (802.1d) tagging are supported, and the mapping is
conformant with the WMM specification. If both L2 and L3 priority tags are available, then both are
Summit WM User Guide, Software Version 5.3
x
x
x
x x
x
x
Purpose
Voice
Video
Background
Best Effort
Turbo Voice
x x
x x
x x x
x x
x x x
x x
x x x x
x x x
x
x
x
x
x
x
x
x
205