Specifications

Chapter 4 - Operation Menus and Parameters
BreezeNET B 154 System Manual
The link quality can be estimated based on the SNR measurement of the RB at the
BU, which can be viewed in the MAC Address Database option in the Site Survey
menu, and on the SNR measurement of the BU at the RB, which can be viewed
using the Continuous Link Quality Display option. If the measured SNR is less
than a certain threshold, it is recommended that the maximum modulation level
be decreased in accordance with Table 4-13, using the values of typical
sensitivity. It is recommended to add a 2 dB safety margin to compensate for
possible measurement inaccuracy or variance in the link quality.
When the Adaptive Modulation algorithm is disabled, this parameter will serve to
determine Fixed Modulation Level used for transmissions.
The minimum and maximum values for the Maximum Modulation Level
parameter are defined by the Sub Band in use.For information on how to view the
Sub Bands supported by the unit and the supported parameters' values and
options, refer to Section 4.2.2.4.
For BU-B14/28, the maximum modulation with 40 MHz is 5, while for BU-B100
the Maximum Modulation is 8.The default is the highest supported modulation
level (modulation level 8 for BU-B100 and modulation level 5 for BU-B14/28).
* The maximum supported value depends on the Max Modulation Level according
to the Sub Band.
NOTE
The SNR measurement at the BU is accurate only when receiving transmissions from the
applicable RB. If necessary, use the Ping Test utility in the Site Survey menu to verify data
transmission.
Table 4-13: Recommended Maximum Modulation Level*
SNR Maximum Modulation Level
SNR > 23 dB 8
21 dB < SNR < 23 dB 7
16 dB < SNR < 21 dB 6
13 dB < SNR < 16 dB 5
10 dB < SNR < 13 dB 4
8 dB < SNR < 10 dB 3
7 dB < SNR < 8 dB 2
6 dB < SNR < 7 dB 1