User's Manual

Chapter 4 - Operation and Administration
BreezeACCESSS VL System Manual
4-88
Maximum Burst Duration (SU and AU)
Sets the maximum time for accumulating burst transmission rights
according to the Burst Duration algorithm.
Available values range from 0 to 2000 (milliseconds).
The default value is 5 (milliseconds), enabling a maximum burst of
(0.005 X CIR) Kbps after a period of inactivity of 5 milliseconds or more.
Maximum Delay (SU only)
Sets the maximum permitted delay in the buffers system. Since certain
applications are very sensitive to delay, if relatively high delays are
permitted, these applications may suffer from poor performance due to
data accumulation in the buffers from other applications, such as FTP.
The Maximum Delay parameter limits the number of available buffers.
Data that is delayed more than the permitted maximum delay is
discarded. If the SU supports applications that are very sensitive to
delay, the value of the Maximum Delay should be decreased.
Valid values range from 300 to 10000 (milliseconds).
The default value is 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 is degraded proportionally to
their CIR (IR=(100%-k%) x CIR). The graceful degradation algorithm is
used as long as k ≤K, where K is the Graceful Degradation Limit.
Beyond this point the simple “brute force” algorithm is used. The
Graceful Degradation Limit should be raised in proportion to the
demand in the cell. The higher the expected demand in a cell, the higher
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 are
not enabled for proper communication with the AU at the highest data
rate.
The available values range from 0 to 70 (%).
The default value is 70 (%).