User's Manual

Menus and Parameters
2-61
BreezeACCESS 4.0 System Manual
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 (%). (Do not use the graceful degradation
algorithm)
" 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 Option is enabled, the MIR/CIR
algorithm is overridden and is forced to operate with MIR
values only (e.g. 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 Disable.
" Show MIR/CIR Parameters – Displays the current values of
the MIR and CIR parameters. In SUs, the display includes