User Manual

Table Of Contents
Menus and Parameters
Operation and Administration
153
4.2.6.2.17.5 Pulse Detection Sensitivity
The Pulse Detection Sensitivity parameter affects the Phy error count: If it is set
to Low, than all Phy errors will be reported as regular Phy errors, regardless of
the signal level. If it is set to High, all Phy errors with levels bellow a certain
threshold (not accessible to the user) will be reported as regular Phy errors, while
those with levels higher than the threshold will be reported as detected radar
pulses.
When DFS (radar detection) is used or during a Spectrum Analysis test, the Pulse
Detection Sensitivity is set internally to High (regardless of the configured value).
The default is Low.
4.2.6.2.17.6 Show Noise Immunity
Select this option to view the current values of the Noise Immunity Control
parameters, and some additional parameters of the ANI mechanism.
4.2.6.2.18 Noise Floor Calculat ion Pa ram e t e rs
The Noise Floor calculation mechanism incorporated in the units is used for
estimating the level of the noise floor. This value is used for estimating SNR
values and for decisions on existence of signals in the channel. In some cases,
especially when a very strong signal exists in neighboring channels, the noise
floor calculated by the built-in mechanism may be significantly below the actual
noise floor level.
Typically, the expected noise floor level is:
5 MHz bandwidth: -102 (dBm)
10 MHz bandwidth: -99 (dBm)
20 MHz bandwidth: -96 (dBm)
The default calculation mode is Fully Automatic, using only the built-in
mechanism. If you experience problems in the wireless link such as excessively
long association process or very low throughput, it may be caused by errors in
noise floor calculation. In this case, it is recommended to perform a Spectrum
Analysis (see section 4.2.6.2.14 on page 148) and view the Average Noise Floor
values.
If the calculated Noise Floor is lower by more than 5 dB from the expected
value, it is recommended to change the calculation mode to Automatic with
Minimum Value, using the expected value as the minimum (Forced Value).
Note that if the SNR of received signals is very low (typically below 10 dB), it is
recommended to maintain the default calculation mode (Fully Automatic).
Changing the calculation mode to Automatic with Minimum Value may result in