Instruction manual

Menus and Parameters
2-89
BreezeACCESS Version 4.3 System Manual
Valid values are from 0 to 2200Kbps.
The default value is 64Kbps.
 Maximum Burst Duration (SU and AU) – Sets the maximum
time for accumulating burst transmission rights according to
the Burst Duration algorithm.
Valid values: 0 – 2000 (milliseconds).
Default value: 5 (milliseconds), allowing a maximum burst of
(0.005 X CIR) Kbps, after an inactivity period of 5 milliseconds or
more.
 Maximum Delay (SU only) – Sets the maximum permitted delay
in the buffers system. Some applications are very sensitive to
delay. If relatively high delays are permitted, such applications
may suffer from poor performance due to accumulation in the
buffers of data from other applications (e.g. FTP). The Maximum
Delay parameter limits the number of available buffers. Data
that is delayed more than the permitted maximum delay will be
discarded. If the SU should support applications that are very
sensitive to delay, the value of the Maximum Delay should be
decreased.
Valid values: 300 – 10000 (milliseconds).
Default value: 5000 (milliseconds).
 Graceful Degradation Limit (AU only) – Sets the limit on using
the graceful degradation algorithm. In cases of over demand, the
performance of all SUs will be degraded proportionally to their
CIR (IR=(100%-k%) x CIR). The graceful degradation algorithm
will be used as long as k ≤ K, where K is the Graceful
Degradation Limit. Beyond this point the simple “brute force”
algorithm will be used. The higher is the expected over demand
in a cell, the higher should be the value of the Graceful
Degradation Limit. Higher demand can be expected in cases of
significant over subscription and/or in deployments where a
high number of subscribers are in locations that do not enable
proper communication with the AU at the highest data rate.
Valid values: 0 – 70 (%).
Default value: 70 (%).
 Mir Only option (AU only) – Enables or disables the option of
forcing the MIR/CIR algorithm to use MIR values only. The
MIR/CIR algorithm determines the actual information rate for
each of the supported SUs under changing demand conditions,
based on the configured CIR and MIR values. When the Mir Only
NOTE:
The value of the MIR must be higher than the value of the applicable CIR. The
system will not accept a MIR value that is lower than the current CIR value, and
vice versa.