Alvarion BreezeACCESS VL 5.4 System Manual page 92

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Best AU Support
The Best AU Support option enables or disables the Best AU selection
feature.
The default is Disable.
NOTE:
If the Best AU feature is not used, the SU associates with the first AU it finds whose ESSID
or Operator ESSID is identical to its own ESSID.
Number Of Scanning Attempts
When the Best AU option is enabled, the SU gathers information on
neighboring AUs for 640 milliseconds on each of the scanned frequencies.
The Number of Scanning Attempts parameter defines the number of times
that the process will be repeated for all relevant frequencies. A higher
number may result in a better decision at the cost of an increased
scanning time during which the SU is not operational.
Valid values: 1 - 255.
Default value: 10.
The total scanning time can be calculated based on the following formula:
Scanning Time (secs) = N * F * 0.64
N = Number of scanning attempts.
F = Number of frequencies in the Frequency Subset defined in the
Frequency Definition submenu.
0.64 seconds is the time spent on each frequency while in scanning mode.
Preferred AU MAC Address
The Preferred AU MAC Address parameter defines a specific AU with which
the SU should associate. Gaining control of the SUs association is a
powerful tool in network management. The Preferred AU MAC Address
parameter is intended for applications where there is a need to dictate the
preferred AU with whom the SU should associate. To prevent the SU from
associating with the first viable AU it finds, the Best AU Support
mechanism should be enabled. Once the SU has identified the preferred
AU based on its MAC address, it will associate with it and terminate the
scanning process. If the preferred AU is not found, the SU will associate
with an AU according to the decision reached using the best AU algorithm.
Valid values: A MAC address string.
BreezeACCESS VL System Manual