Configuring The Maximum Data Rate - Alvarion BreezeACCESS VL 5.4 System Manual

4-8
3.
If the SNR measurement of the relevant SU at the AU is lower than
26 dB, increase the value of the Initial Transmit Power parameter
for the SU until an SNR measurement of 26 dB is achieved or until the
Initial Transmit Power parameter is set to its maximum value.

Configuring the Maximum Data Rate

This section describes how to configure the maximum data rate for
BreezeACCESS VL Subscriber Units.
To configure the maximum data rate:
1.
If, after the SU is configured to its optimal Transmit Power level, the
SNR at the AU is too low, it is recommended that you configure the
Maximum Data Rate parameter to a value that is lower than the
maximum. This can decrease the number of retransmissions due to
attempts to transmit at rates that are too high for the actual quality of
the link.
2.
Check the SNR of the SU at the AU. You can use Telnet to view the
SNR values in the MAC Address Database, which can be accessed
from the Site Survey menu. If the SNR is lower than the values
required for the maximum data rate according to Table 4-3, it is
recommended that you decrease the maximum data rate.
NOTE:
The SNR measurement at the AU is accurate only when receiving transmissions from the
applicable SU. If necessary, use the Ping Test utility in the Site Survey menu to verify data
transmission.
3.
Configure the Maximum Data Rate according to Table 4-3, 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.
Reset the unit to activate the new configuration.
NOTE:
If the unit is associated with the AU, then the final configuration of the Maximum Data
Rate parameter may be performed remotely, for example, from the site of the AU or from
another site.
BreezeACCESS VL System Manual