User's Manual

Configuring the Maximum Modulation Level
Manual Revision 1.0
3-7
Configuring the Maximum Modulation
Level
This section describes how to configure the maximum modulation level
for BreezeNET B units.
NOTE
If the RB is associated with the BU, then the final configuration of the Maximum
Modulation Level parameter may be performed remotely, for example, from the site of
the BU or from another site.
1. If the SNR of the RB at the BU is too low, and vice versa, it is
recommended that you configure the Maximum Modulation Level
parameter to a value that is lower than the maximum supported by
the unit. This can decrease the number of retransmissions due to
attempts to transmit at modulation levels that are too high for the
actual quality of the link.
2. Check the SNR of the RB at the BU. You can use Telnet to view the
SNR values in the MAC Address Database of the BU, which can be
accessed from the Site Survey menu. If the ATPC algorithm is not
enabled in both units, the test should be done with the Tx Power
Level parameters configured to their maximum values (subject to
local regulatory limitations). If the SNR is lower than the values
required for the maximum modulation level according to
Table 3-2, it is recommended that you decrease the value of the
Maximum Modulation Level.
NOTE
The SNR measurement at the BU is accurate only when receiving transmissions from
the applicable RB. If necessary, ping the BU to verify data transmission from the RB.
3. Configure the Maximum Modulation Level according to Table 3-2,
using the typical sensitivity values. It is recommended that a 2 dB
margin be added to compensate for possible measurement
inaccuracy or variance in the quality of the link.
4. Repeat steps 2 - 3 for the BU, checking the SNR at which it is
received at the RB using the Continuous Link Quality Display option
in the Site Survey menu. There is no need to ping the RB, since the
SNR measurement at the RB is based on beacons which are
continuously transmitted by the BU.
To configure the Maximum Modulation Level: