Instruction manual

2-88
BreezeACCESS Version 4.5 Operations and Administration
Manual Revision: 1.0
number of successful windows at a certain rate required to reach a
decision to increase the rate depends on previous rate of
unsuccessful windows at the higher rate. The higher the rate of
previous unsuccessful windows at a specific rate, the higher is the
number of required consecutive successful windows at the lower
rate prior to increasing the rate
. If the current rate is higher than the
minimum available rate (1 Mbps), the transmission rate will be
decreased to the next available rate following a failed window. The
Multi-Rate menu includes the following parameters:
" Multi-Rate Support – Enables or disables the Multi-Rate
decision algorithm. When enabled, the algorithm supports
increase/decrease of transmission rates in the range from
1 Mbps to the current value of the Maximum Data Rate
parameter. (Enabling the algorithm has no effect if the
Maximum Data Rate is 1 Mbps).
The default selection is Enable.
" Multi-Rate Decision Window Size – Sets the size of the
decision window. The size of a window is measured as the
number of consecutive transmission or retransmission
attempts. Increasing the size of the window will increase the
probability that it will be a successful window, thus slowing
down the decision to degrade to a lower rate and accelerating the
decision to upgrade to a higher rate.
Valid values are from 1 to 50.
The default value is 12.
" Number of Failures in Multi-Rate Decision Window – Sets the
maximum number of failures allowed in a decision window. A
window is defined as successful only if the number of failures is
not higher than this number. A transmission attempt is defined
as a failure if an ACK was not received upon the first
transmission attempt. Increasing the value of this parameter
will increase the probability that it will be a successful window,
thus slowing down the decision to degrade to a lower rate and
accelerating the decision to upgrade to a higher rate.
Valid value: 1 to Multi-Rate Decision Window Size.
Default value: 8.
! Dwell Time (AU only) – The time spent on a radio channel before
hopping to the next channel according to the operational hopping
sequence.
The allowed selections are 32, 64 and 128 Kilo-microseconds.
The default value is 128 Kilo-microseconds.
When the ACSE Option is enabled this parameter is not applicable
and the dwell time is the ACSE Dwell Time, set to a fixed value of 60
milliseconds.