Specifications

Chapter 4 - Operation and Administration Menus and Parameters
BreezeACCESS 4900 165 System Manual
The available values are 0, 7, 15, 31, 63, 127, 255, 511 and 1023. A value of 0
means that the contention window algorithm is not used and that the unit will
attempt to access the medium immediately after a time equal to DIFS.
The default value is 15.
4.2.6.5.3 Maximum Contention Window
The Maximum Contention Window parameter defines the upper limit for the
maximum number C used in the back-off algorithm as described in Minimum
Contention Window above.
The available values are 7, 15, 31, 63, 127, 255, 511 and 1023.
The default value is 1023.
4.2.6.5.4 Multicast Modulation Level (AU only)
The Multicast Modulation Level parameter defines the modulation level used for
transmitting multicast and broadcast data frames. Multicast and broadcast
transmissions are not acknowledged; therefore if a multicast or broadcast
transmission is not properly received there is no possibility of retransmitting. It is
recommended that you set a lower modulation level for broadcast and multicast
frame transmissions to increase the probability that they are received without
errors.
The Multicast Modulation Level parameter is applicable only to data frames.
Beacons and other wireless management and control frames are always
transmitted at the lowest modulation level, according to the Sub-Band.
The range is from 1 to 8.
The minimum and maximum values for the Multicast Modulation Level are
defined by the Sub-Band in use. For information on how to view the Sub-Bands
supported by the unit and the supported parameters' values and options, refer to
section “Show Country Dependent Parameters” on page 72. Currently, all Sub
Bands support the entire range of modulation levels, from 1 to 8. However, the
highest modulation level supported by units with HW revision A is modulation
level 7.
The default value is the lowest supported modulation level.
CAUTION
A value of 0 disables the contention window back-off algorithm. It should only be used in
point-to-point applications. For more details on configuring units in a point-to-point link refer to
“Arbitration Inter-Frame Spacing (AIFS)” on page 127.