User guide

C
HAPTER
6
| Wireless Configuration
Advanced Settings
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WMM defines four access categories (ACs): voice, video, best effort, and
background. These categories correspond to traffic priority levels and are
mapped to IEEE 802.1D priority tags (see Table 3). The direct mapping of
the four ACs to 802.1D priorities is specifically intended to facilitate
interoperability with other wired network QoS policies. While the four ACs
are specified for specific types of traffic, WMM allows the priority levels to
be configured to match any network-wide QoS policy. WMM also specifies a
protocol that access points can use to communicate the configured traffic
priority levels to QoS-enabled wireless clients.
The Wi-Fi Multimedia section on the Wireless Settings Advanced page
allows you to enable WMM and set detailed QoS parameters.
Figure 17: Wi-Fi Multimedia Settings
The following items are displayed in this section on this page:
WMM — Sets the WMM operational mode on the access point. When
enabled, the QoS capabilities are advertised to WMM-enabled clients in
the network. WMM must be supported on any device trying to
associated with the access point. Devices that do not support this
feature will not be allowed to associate with the access point.
(Default: Enabled)
APSD — When WMM is enabled, Automatic Power Save Delivery
(APSD) can also be enabled. APSD is an efficient power management
method that enables client devices sending WMM packets to enter a
low-power sleep state between receiving and transmitting data.
(Default: Disabled)
Table 3: WMM Access Categories
Access
Category
WMM
Designation
Description 802.1D
Tags
AC_VO (AC3) Voice Highest priority, minimum delay. Time-sensitive
data such as VoIP (Voice over IP) calls.
7, 6
AC_VI (AC2) Video High priority, minimum delay. Time-sensitive
data such as streaming video.
5, 4
AC_BE (AC0) Best Effort Normal priority, medium delay and throughput.
Data only affected by long delays. Data from
applications or devices that lack QoS
capabilities.
0, 3
AC_BK (AC1) Background Lowest priority. Data with no delay or
throughput requirements, such as bulk data
transfers.
2, 1