User Manual

Table Of Contents
Chapter 4 - Operation and Administration
BreezeACCESS VL System Manual
190
4.2.6.6.2.6 Maximum Delay (SU only)
Sets the maximum permitted delay in the buffers system. As 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).
4.2.6.6.2.7 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 oversubscription and/or in deployments where a
high number of subscribers are in locations without proper communication with
the AU at the highest data rate.
The available values range from 0 to 70 (%).
The default value is 70 (%).
4.2.6.6.2.8 MIR Only Option (AU only)
When the MIR Only Option is enabled, it forces 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 conditions of demand, based on
the configured CIR and MIR values. When the MIR Only Option is enabled, the
MIR/CIR algorithm is overridden and forced to operate with MIR values only. For
example, the AU attempts to enable all SUs to transmit/receive information at the
specified MIR value. When enabled, the graceful degradation algorithm, which is
a part of the CIR/MIR algorithm, is also disabled.
The default is Enable.
4.2.6.6.2.9 MIR Threshold Percent (AU only)
Sets the threshold of wireless link utilization above which the MIR/CIR algorithm
is activated.
The range is from 0 to 100 (%).
The default is 50%.