Planning; Table 2: Channel Center Frequencies, By Region - Motorola 5440AP - Canopy 5.4 GHz AP User Manual Supplement

Canopy 400 Series OFDM AP and SM

3 Planning

Canopy 400 Series products use a 10 MHz channel size configurable on 5 MHz centers. This
channel size, along with some different characteristics due to the use OFDM carrier technology
and QPSK, 16 QAM, or 64 QAM modulation, supports somewhat different channel planning than
for standard Canopy. (For reference, standard Canopy uses 20 MHz channels configurable on 5
MHz centers, single carrier technology, and 2-level and 4-level FSK modulation.)
3.1 TOWER CHANNEL PLANNING
For a single cluster of 4 APs on a tower, 2-channel re-use with channels on 10 MHz channel
center spacing gives good performance. In channel design parlance, this can be stated as ABAB
channel planning, with no guard band needed between A and B. A typical arrangement might be
to use radios configured for 5480 MHz aimed north and south, and radios configured for 5490
MHz aimed east and west.
(For reference, standard Canopy uses 2-channel re-use with clusters of 6 APs on a tower with
channel center spacing of either 25 MHz for Advantage APs or 20 MHz for non-Advantage APs.
This is ABCABC channel planning, with 5 MHz guard band between the 20 MHz channels for
Advantage APs and no guard band needed for non-Advantage.)
Available channel center frequencies for each region are shown in Table 2. These vary by region
due to
different band edge RF specifications (for example, between Canada/US and
•
Europe)
requirements in Europe and Canada to not impinge on the frequencies between 5600
•
and 5650 MHz, which are frequencies on which some weather radar operate
Region
US
Canada
Europe
US FSK (for comparison)
Canada FSK (for comparison)
The best practice for channel planning for APs is to conduct extensive site RF surveys before
choosing channels. For those with the equipment and expertise, use commercial and industrial
spectrum analysis equipment. The Canopy 400 Series APs and SMs do not provide a spectrum
analyzer in the first release (planned for a subsequent release), but standard 5.4 GHz FSK SMs
can be used to give useful information on the RF environment in the planned Canopy 400 Series
AP deployment location.
3.2 DOWNTILT
The standard AP antenna produces a 3 db beam elevation (up and down) of 5°, with near-in null
fill that allows good coverage of close-in SMs that otherwise would be affected by the narrow
pattern. This is a narrower pattern than operators may be used to with standard Canopy's 60° 3
dB beam, and may require downtilt on the antenna. The standard antenna has provision for
measured downtilt. The operator should estimate downtilt based on antenna height above the
Version 1, April 2008

Table 2: Channel Center Frequencies, by Region

Range of Center Frequencies Available (MHz)
(on 5 MHz centers within this range, inclusive)
5480 - 5710
5480 – 5595, 5655 - 5710
5475 - 5595, 5655 - 5715
5495 - 5705
5495 - 5575, 5675 - 5705
User Guide
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