Spectrum Management; Wireless Channels; Spectrum Management Measurements - Motorola PTP 300 Series User Manual

7.9

Spectrum Management

Spectrum Management Selection is the PTP 300 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.

7.9.1 Wireless Channels

The PTP 300 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, 10 MHz or 5 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, as described in Section 7.7.4 "Installation Wizard Step 2 - Wireless
Configuration".

7.9.2 Spectrum Management Measurements

Each end of the PTP 300 Series Bridge performs a single measurement of the combined
receiver input power in an inactive portion of the TDD cycle. The measurement is made with
an effective bandwidth of 15 MHz, 10 MHz or 5 MHz on a single channel and includes the
contribution from receiver noise.
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.
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