User's Manual

Menus and Parameters
 DIFS (Distributed coordination function Inter-Frame Spacing) is typically used
edium is free. If the unit decides that the
on by DIFS plus a number of time
for other frame types when the m
medium is not free, it will defer transmissi
slots as determined by the Contention Window back-off algorithm (see
section 4.2.6.5.2
) after reaching a decision that the medium has become free.
FS, where AIFS can be configured to one or two time
d be configured to two time slots. A value of 1 should
nt-to-point link, where in the other
slots. This ensures that the unit
DIFS equal SIFS plus AI
slots. Typically, AIFS shoul
only be used in one of the two units in a poi
unit the AIFS remains configured to two time
with AIFS configured to one has an advantage over the other unit, provided that
the
Minimum Contention Window (section 4.2.6.5.2 ) parameter in both units is
configured to 0 to disable the contention window back-off algorithm.
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 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.
4.2.6.2.11
r of Associations parameter defines the maximum number
selected AU, while still
to 5.
and AU-SA is 512. For AUS-BS and AUS-SA the default
is 5.
Maximum Number of Associations (AU only)
The Maximum Numbe
of Subscriber Units that can be associated with the
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
Default value for AU-BS
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
actu imit (512 when Data Encryption is disabled, al limit. The Maximum Number of Associations L
124 the Show Air Interface Parameters display. when Data Encryption is enabled) is indicated in
Operation and Administration
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