Spectrum Management - Motorola MOTOWI 4 User Manual

If you cannot communicate with the unit after 120 seconds, this could indicate a problem with the
memory update process. Under these circumstances the user should enter "Recovery Mode", see
Section 9 "Recovery Mode".
After the reboot the user should check that the required software image is loaded and running.
NOTE: Please ensure that you are upgrading the correct units. Units cannot be downgraded..

8.3.7 Spectrum Management

Spectrum Management Selection is the PTP 500 Series Bridge feature that monitors the available
wireless spectrum and directs both ends of the wireless link to operate on a channel with a minimum
level of co-channel and adjacent channel interference.
8.3.7.1 Wireless Channels
The PTP 500 Series Bridge operates using a set of predefined overlapping channels. There are a
different number of channels, depending on the raster mode selected. Each channel occupies 15
MHz of wireless spectrum and is offset in center frequency from its neighboring channel by 5 MHz.
It is important to note that adjacent channels on the Spectrum management display have a 5 MHz
overlap to the adjacent channel.
The default channelization can be modified by varying the lower center frequency attribute in
the installation wizard - see
Considerations" for more detail.
8.3.7.2 Spectrum Management Measurements
The 500 Series Bridge performs two mean signal measurements per TDD cycle, per channel. This
mean measurement represents the mean received signal power for the 40 microseconds measurement
period.
The Spectrum Management algorithm collects measurements equally from all channels.
This process is called the Channel Availability Check (hereafter referred to by the acronym CAC).
The CAC uses a round-robin channel selection process to collect an equal amount of measurements
from each channel. It is important to note that the CAC measurement process is not altered by
the channel barring process. Measurements are still collected for all channels irrespective of the
number of barred channels.
8.3.7.3 Measurement Analysis
Spectrum Management uses statistical analysis to process the received peak and mean measure-
ment. The statistical analysis is based on a fixed, one minute, measurement quantization period.
Spectrum Management collects data for the specified quantization period and only at the end of
the period is the statistical analysis performed.
The analysis produces three key metrics for each channel:
Web Page Reference
Section 8.3.4.3 "Wireless Configuration". See
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Section 5 "General