User's Manual

Chapter 4 - Operation and Administration
BreezeACCESS VL System Manual
140
NOTE
The AIFS parameter is not applicable when the Wireless Link Prioritization Option is enabled.
The available options are 1 or 2 (time slots).
The default is 2 time slots.
CAUTION
An AIFS value of 1 should only be used in point-to-point applications (when the Wireless Link
Prioritization Option is enabled). 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.
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
When the Data Encryption Option is enabled, the actual maximum number of SUs that can
associate with the AU-BS or AU-SA is limited to 124. The number displayed for the Maximum
Number of Associations is the value configured for this parameter, which might be higher than the
actual limit. 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:
 A SNAP frame is received from another AU indicating that the SU is now associated with the
other AU.
 The SU failed to respond to a certain number of consecutive frames transmitted by the AU and
is considered to have "aged out".
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 reset the AU.