Cambium Networks cnWave, User Manual

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Configuring 60 GHz cnWave™ 166
4. Wireless Scans (Scheduled Beam Adjustment) - This feature runs a PBF scan at every defined
Scan Interval. Navigate to Configuration > Network > Basic > Wireless Scans to run a PBF scan, as
shown below:
Figure 173:
The Wireless Scans section
The 60 GHz cnWave products can align the wireless link within an azimuth/elevation range by
selecting from a number of fixed beams.
A normal scan without Scheduled Beam Adjustment does the following operations:
l
Beam selection occurs only on wireless link acquisition.
l
Disassociating and re-associating the link or otherwise causing the link to drop and re-
acquire is needed to perform a new beam selection.
l
Any degradation in the wireless conditions does not trigger a new beam selection unless
the link drops and reacquires.
The advantages of the Scheduled Beam Adjustment scan are:
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If the link is to acquire during heavy rain, then the optimal beam at that time may be
suboptimal when the weather changes.
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If snow accumulation is present on the unit during acquisition, the optimally selected beam
may be different when the snow has melted.
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Network-wide ignition in a dense deployment can cause interference when multiple nodes
are acquiring. This interference can cause sub-optimal beam selection.
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Any physical change to alignment that is not severe enough to cause a link drop and
subsequent beam scan can be corrected for.
The cost of Scheduled Beam Adjustment is:
l
This feature causes a network-wide outage of approximately two minutes. For this reason,
unless there is a specific issue being addressed, it is recommended to either disable this
feature or configure an interval of >=24 hours.