Alvarion BreezeACCESS VL System Manual page 182

Chapter 4 - Operation and Administration
4.2.6.2.12 Maximum Number of Associations (AU only)
The Maximum Number of Associations parameter defines the maximum number
of Subscriber Units that can be associated with the selected AU, while still
guaranteeing the required quality of service to customers.
Available values for AU-BS and AU-SA range from 0 to 512. For AUS-BS and
AUS-SA the range is from 0 to 8.
Default value for AU-BS and AU-SA is 512. For AUS-BS and AUS-SA the default
is 8.
NOTE
The Maximum Number of Associations must be set to a value of 124 or lower to enable Data
Encryption. As long as Data Encryption is enabled, the Maximum Number of Associations cannot
be set to a value higher than 124.
The Maximum Number of Associations Limit (512 when Data Encryption is disabled, 124 when
Data Encryption is enabled) is indicated in the Show Air Interface Parameters display.
NOTE
There is no aging time for SUs. An SU is only removed from the list of associated SUs under the
following conditions:
The SU failed to respond to 100 consecutive data frames transmitted by the AU and is
considered to have "aged out".
During the last 6 minutes (or more) the SU did not transmit any data frame, and failed to
respond to certain frames that typically are transmitted by the AU every 10 seconds. Since the
sampling interval for this state is about 10 minutes, it means that the decision to remove the SU
from the Associations Database will take place between 6 to 16 minutes from the time the SU
ceased sending data or responding to these "keep-alive" frames (for AUS the sampling interval
is 1 minute, meaning decision time of 6 to 7 minutes).
Therefore, the database of associated SUs may include units no longer associated with the AU. If
the number of associated SUs has reached the value of the Maximum Number of Associations
parameter, the selected AU cannot serve additional SUs. To view the current number of associated
SUs, use the Display Association Info option in the MAC Address Database menu. To delete
inactive SUs from the database you must either disassociate them (see 4.2.6.2.16) or reset the AU.
4.2.6.2.13 Wireless Link Trap Threshold (AU only)
The Wireless Link Trap Threshold parameter defines the threshold for the
wireless quality trap, indicating that the quality of the wireless link has dropped
below (on trap) or has increased above (off trap) the specified threshold.
The Wireless Link Trap Threshold is in percentage of retransmissions, and the
allowed range is from 1 to 100 (%).
The default is 30 (%).
4.2.6.2.14 Spectrum Analysis
Gaining knowledge of the noise characteristics per channel enables construction
of a relatively noise free working environment. In order to gain information
regarding noise characteristics in the location of the unit, the unit will enter
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BreezeACCESS VL System Manual