Motorola PTP 500 User's Guide download pdf (Page 144)

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7.9 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.

7.9.1 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, 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

Config

uration”.

7.9.2 Spectrum Management Measurements

Each end of the PTP 500 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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Motorola PTP 500 User's Guide Page 144