User's Manual

Menus and Parameters
Manual Revision 1.0
4-57
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. 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 shall 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.
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.
Default value: 512.
NOTE
There is no aging time for SUs. An SU is only removed from the list of associated SUs
under the following conditions:
a. A SNAP frame is received from another AU indicating that the SU is now associated
with the other AU.
b. 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.
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 (%).