User's Manual

Chapter 4 - Operation and Administration
BreezeACCESSS VL System Manual
4-80
Table 4-9: Recommended Maximum Modulation Level*
SNR Maximum Modulation Level
SNR> 23 dB 8
22dB < SNR < 23 dB 7
18 dB< SNR < 22 dB 6
14 dB < SNR < 18 dB 5
11 dB < SNR < 14 dB 4
9 dB < SNR < 11 dB 3
7 dB < SNR < 9 dB 2
6 dB<SNR < 7 dB 1
* the maximum supported value depends on the unit’s HW revision and on the
Max Modulation Level according to the Sub Band.
Average SNR Memory Factor
The Average SNR Memory Factor defines the weight of history (value of
last calculated average SNR) in the formula used for calculating the
current average SNR for received data frames. This average SNR is used
by the ATPC algorithm in the AU and is also included in the Adaptive
Modulation Algorithm information messages transmitted by the AU and
the SU. The higher the value of this parameter, the higher is the weight
of history in the formula.
Available values: -1 to 32. -1 is for no weight for history, meaning that
average SNR equals the last measured SNR.
Default value: 5
Number of HW Retries
The Number of HW Retries parameter defines the maximum number of
times that an unacknowledged packet is retransmitted. When the
Adaptive Modulation Algorithm is disabled, a frame will be dropped
when the number of unsuccessful retransmissions reaches this value.
For details on the effect of this parameter when the Adaptive
Modulation Algorithm is enabled, refer to Adaptive Modulation
Algorithm, on page 4-81.
The available values range is from 1 to 15.
The default value is 10.