Extreme Networks Altitude 4700 Series Product Reference Manual page 182

Network Management
5 Refer to the Beacon Settings field to set the radio beacon and DTIM intervals.
Beacon Interval
DTIM Interval
6 Refer to the Dynamic Chain Selection Settings field to enable or disable Dynamic Chain Selection.
When enabled, dynamic chain selection forces an Access Point radio to transmit packets using legacy
transmit rates (11b, 11g and/or 11a rates) using a single transmit chain. Transmissions utilizing 11n
rates (MCS0–MCS15) continue to use a normal number of transmit chains, which may be 1, 2, or 3
depending on the configuration and power source. If dynamic chain selection is disabled, all
transmissions utilize the same number of transmit chains. This feature is disabled by default.
7 Refer to the QBSS Load Element Settings field to determine whether channel usage data is transmitted
to associated devices.
Enable QBSS load
element
QBSS Beacon
Interval
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The beacon interval controls the performance of power
save stations. A small interval may make power save
stations more responsive, but it will also cause them to
consume more battery power. A large interval makes
power save stations less responsive, but could increase
power savings. The default is 100. Avoid changing this
parameter as it can adversely affect performance.
The DTIM interval defines how often broadcast frames are
delivered for each of the four Access Point BSSIDs. If a
system has an abundance of broadcast traffic and it needs
to be delivered quickly, Extreme Networks recommends
decreasing the DTIM interval for that specific BSSID.
However, decreasing the DTIM interval decreases the
battery life on power save stations. The default is 10 for
each BSSID. Extreme Networks recommends using the
default value unless qualified to understand the
performance risks of changing it.
When enabled, the Access Point communicates channel
usage data to associated devices using an interval you
define. The QBSS load represents the percentage of time
the channel is in use by the Access Point and the Access
Point's MU count. This information is helpful in assessing
the Access Point's overall load on a channel, its availability
for additional device associations and multi media traffic
support. This setting is enabled by default.
Set the QBSS beacon (transmission) interval the Access
Point uses for sending QBSS data to associated devices.
Altitude 4700 Series Access Point Product Reference Guide