Alvarion BreezeNET B System Manual page 197

Chapter 4 - Operation
4.2.6.6.3.4.3 IP Range Mask
This option defines the range mask which, in conjunction with the base IP
address, defines the IP range used for prioritization.
The values are entered as 4 groups of up to 3 digits separated by dots.
The default value is 255.0.0.0.
4.2.6.6.3.5 Low Priority Traffic Minimum Percent
This feature ensures that a certain amount of low priority packets, specified by
the Low Priority Traffic Minimum Percent (LPTMP) parameter, is transmitted even
at the expense of high priority traffic.
The mechanism guarantees a low priority traffic with a rate of LPTMP * RT /100,
where RT symbolizes the allowed traffic rate. The high priority traffic will thus not
be able to exceed (100-LPTMP) * RT/100. If the system receives high priority traffic
at a rate higher than this figure, some high priority packets will be discarded.
The range is between 0 and 100 (%).
The default value is 0 (%).
NOTE
The Low Priority Traffic Minimum Percent parameter is not applicable when the Wireless Link
Prioritization Option is enabled.
4.2.6.6.3.6 Wireless Link Prioritization Parameters (BU-B14/28/100)
To better support delay-sensitive and other high-priority traffic, a set of Wireless
Link Prioritization parameters enables configuring parameters that affect the
processes of gaining access to the wireless media and the of transmitting high/low
priority packets.
The time interval between two consecutive transmissions of frames is called
Inter-Frame Spacing (IFS). This is the time during which the unit determines
whether the medium is idle using the carrier sense mechanism. The IFS depends
on the type of the next frame to be transmitted, as follows:
SIFS (Short Inter-Frame Spacing) is used for certain frames that should be

transmitted immediately, such as ACK and CTS frames. The value of SIFS is
16 microseconds.
DIFS (Distributed coordination function Inter-Frame Spacing) is typically used

for other frame types when the medium is free. If the unit decides that the
medium is not free, it will defer transmission by DIFS plus a number of time
BreezeNET B 173
Menus and Parameters
System Manual