MSM7xx Controllers Configuration Guide v6.4.0

HP APs support the following two explicit beamforming techniques:
• Non-compressed beamforming, in which the client station calculates and sends the steering
matrix to the AP.
• Compressed beamforming, in which the client station sends a compressed steering matrix to
the AP.
Radio calibration is not required to use either of these two methods.
NOTE: Beamforming only works with wireless clients that are configured to support it.
RTS threshold
Not available in Monitor or Sensor modes.
Use this parameter to control collisions on the link that can reduce throughput. If the Controlled
APs > [group] [AP] >> Status > Wireless page shows increasing values for Tx multiple retry frames
or Tx single retry frames, adjust this value until the errors clear. Start with a value of 1024 and
decrease to 512 until errors are reduced or eliminated. Note that using a small value for RTS
threshold can affect throughput. Range: 128 to 1540.
If a packet is larger than the threshold, the AP holds the packet and issues a request to send (RTS)
message to the client station. The AP sends the packet only when the client station replies with a
clear to send (CTS) message. Packets smaller than the threshold are transmitted without this
handshake.
Spectralink VIEW
Supported on: MSM310, MSM320, MSM335, MSM410, MSM422, HP 425, MSM430, MSM460,
MSM466, MSM466–R
Not available in Monitor or Sensor modes.
Provides support for Spectralink phones using Spectralink Voice Interoperability for Enterprise
Wireless (VIEW) extensions.
Severe interference detection/mitigation
Supported on: MSM410, HP 425, MSM430, MSM460, MSM466, MSM466-R
Not available in Monitor or Sensor modes.
When enabled, the radio maintains channel-quality information for all potential operating channels.
The information for the current operating channel is derived using performance statistics (packet
retry rates, error rates, per-client data-rates), beacons received from in-channel neighbor APs,
spectrum analysis samples, etc.
When an AP detects a severe degradation in the channel quality of the current operating channel
on a radio (that persists for tens of seconds), the AP informs the controller that it is experiencing
severe channel interference and wants to initiate a channel change.
Before doing this, the AP does an intensive spectrum analysis scan to identify the type of interference.
This information is included in the report to the controller. The controller responds to the AP and
provides it with a prioritized list of alternative channels that are optimal from a system-wide
perspective. The AP does a quick check of each channel in priority order to verify that interference
is not present. Assuming a new channel is usable, the AP initiates a channel switch to the alternate
channel. The AP then informs the controller that it has switched channels. After switching to an
alternative channel, the AP continues to monitor the channel quality of the non-operating channels.
Eventually, it is expected that the interference will go away. (Most interference sources are
temporary.) At this point the AP informs the controller that the original channel is clear. The controller
then decides whether the AP should switch back to the original channel or continue operating on
the alternate channel.
Radio configuration 97