Specifications

Chapter 4 - Operation and Administration Menus and Parameters
BreezeACCESS 4900 128 System Manual
4.2.6.2.11 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 range from 0 to 512.
The default value is 512.
NOTE
An AIFS value of 1 should only be used in point-to-point applications (when the Wireless Link
Prioritization Option is disabled). Otherwise the default value of 2 must always be used. In a
point-to-point link, only one unit should be configured to an AIFS value of 1. When both units need
to transmit, the unit with an AIFS value of 1 will have an advantage over the unit with AIFS of 2. In
this case, the Minimum Contention Window parameter in both units must be configured to 0 to
disable the contention window back-off algorithm.
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
“Disassociate (AU
only)” on page 131
) or reset the AU.