User Manual

Table Of Contents
Chapter 4 - Operation and Administration
BreezeACCESS VL System Manual
152
In many deployments the transition to Manual mode is sufficient. If not, you may
try changing the Noise Immunity Level and/or Spur Immunity Level parameters.
The target is to reduce the amount of Phy Error rate reported by the unit (see
Total Rx events on page 115). To ensure that sensitivity is not reduced too much
and SUs are not lost, verify that the Age (see Display Association Info on page
119) of all SUs is below 20 seconds.
Do not activate the OFDM Weak Signal parameter if the SNR is below 36 dB.
Under normal conditions, the OFDM Weak Signal should never be activated in
the AU, since the SNR of all SUs will be below 36 dB when ATPC is enabled.
The Noise Immunity Control submenu includes the following options:
4.2.6.2.17.1 Noise Immunity State Control
The Noise Immunity State Control defines the activation mode of the Adaptive
Noise Immunity mechanism: Automatic or Manual. The following parameters of
the Noise Immunity Control mechanism are applicable only for Manual mode.
The default is Automatic.
4.2.6.2.17.2 Noise Immunity Level
The Noise Immunity Level parameter sets the threshold for immunity against
broadband interfering signals. A higher value may reduce the number of errors at
the expense of reduced sensitivity.
The range is from 0 to 4. In the current version only 0 and 4 should be used.
The default is 0.
4.2.6.2.17.3 Spur Immunity Level
The Spur Immunity Level parameter sets the threshold for immunity against
narrow band interfering signals such as spurious from signals at other
frequencies. A higher value may reduce the number of errors at the expense of
reduced sensitivity.
The range is from 0 to 7.
The default is 0.
4.2.6.2.17.4 OFDM Weak Signal
The OFDM Week Signal parameter sets the threshold for immunity against
interfering OFDM signals.
The available options are 0 or 1. A value of 1 means that the unit will immediately
reject OFDM packets with a relatively low SNR.
The default is 0.