Users Guide

206 | Secure Enterprise Mesh Dell PowerConnect ArubaOS 5.0 | [User Guide
Spectrum Load Balancing The Spectrum Load Balancing feature helps optimize network resources by balancing clients
across channels, regardless of whether the AP or the controller is responding to the wireless
clients' probe requests.
If enabled, the controller compares whether or not an AP has more clients than its neighboring APs
on other channels. If an AP’s client load is at or over a predetermined threshold as compared to its
immediate neighbors, or if a neighboring Dell AP on another channel does not have any clients, load
balancing will be enabled on that AP. This feature is disabled by default. For details, see “Spectrum
Load Balancing” on page 149.
RX Sensitivity Tuning
Based Channel Reuse
In some dense deployments, it is possible for APs to hear other APs on the same channel. This
creates co-channel interference and reduces the overall utilization of the channel in a given area.
Channel reuse enables dynamic control over the receive (Rx) sensitivity in order to improve spatial
reuse of the channel.
This feature is disabled by default. To enable this feature, click the RX Sensitivity Tuning Based
Channel Reuse drop-down list and select either static or dynamic. To disable this feature, click the
RX Sensitivity Tuning Based Channel Reuse drop-down list and select disable. For details on each of
these modes, see “RX Sensitivity Tuning Based Channel Reuse” on page 149.
NOTE: Do not enable the Channel Reuse feature if Non 802.11 Interference Immunity is set to level 3
or higher. A level-3 to level-4 Noise Immunity setting is not compatible with the Channel Reuse
feature.
RX Sensitivity Threshold RX sensitivity tuning based channel reuse threshold, in - dBm.
If the Rx Sensitivity Tuning Based Channel reuse feature is set to static mode, this parameter
manually sets the AP’s Rx sensitivity threshold
(in -dBm). The AP will filter out and ignore weak signals that are below the channel threshold signal
strength.
If the value for this parameter is set to zero, the feature will automatically determine an appropriate
threshold.
Non 802.11 Interference
Immunity
(for 802.11g profiles only)
Set a value for 802.11 Interference Immunity. This parameter sets the interference immunity on the
2.4 Ghz band.
The default setting for this parameter is level 2. When performance drops due to interference from
non-802.11 interferers (such as DECT or Bluetooth devices), the level can be increased up to level 5
for improved performance. However, increasing the level makes the AP slightly “deaf” to its
surroundings, causing the AP to lose a small amount of range.
The levels for this parameter are:
z Level 0: no ANI adaptation.
z Level 1: noise immunity only.
z Level 2: noise and spur immunity.
z Level 3: level 2 and weak OFDM immunity.
z Level 4: level 3 and FIR immunity.
z Level 5: disable PHY reporting.
NOTE: Do not raise the noise immunity feature’s default setting if the RX Sensitivity Tuning Based
Channel Reuse feature is also enabled. A level-3 to level-5 Noise Immunity setting is not compatible
with the Channel Reuse feature.
Enable CSA Channel Switch Announcements (CSAs), as defined by IEEE 802.11h, enable an AP to announce that
it is switching to a new channel before it begins transmitting on that channel. This allows clients that
support CSA to transition to the new channel with minimal downtime.
CSA Count Number of channel switch announcements that must be sent prior to switching to a new channel.
The default CSA count is 4 announcements.
Management Frame
Throttle Interval
Averaging interval for rate limiting mgmt frames from this radio, in seconds. A management frame
throttle interval of 0 seconds disables rate limiting.
Management Frame
Throttle Limit
Maximum number of management frames that can come in from this radio in each throttle interval.
Table 40 802.11a/802.11g RF Management Configuration Parameters (Continued)
Parameter Description