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helpful for network design. Additional interference mitigation design may be needed in some
cases, depending on the RF environment.
•
Use a minimum vertical separation of 6 ft (1.8 m) between the 30/60 Mbps Backhaul and
any other Canopy module.
•
Start the frequency planning from low end of frequency band for the Canopy Access
Points or 10/20 Mb backhauls.
•
Select the high end available frequency band for 30/60 Mbps Backhaul(s), use dynamic
frequency selection or manually select,
Note, 100 vertical feet (30 vertical meters) of distance separation is still required between 10 or
20 Mbps Backhauls and Access Points operating in the same frequency band.
6.1.6
Additional Information for Collocating
The Canopy 30/60 Mbps Backhaul and other Canopy Backhauls each have their individual
frequency constraints. For example, the 30/60 Mbps Backhaul employs a sophisticated
dynamic frequency selection (DFS) capability. This allows it to automatically select the highest-
capacity frequency currently available for the link. However, DFS becomes less effective as the
spectrum becomes more crowded. In crowded environments, manual frequency selection may
be required to extract the very best performance from the units. DFS measurements are still
very useful, however, because they provide the measurements to confirm that the optimum
arrangement has been achieved.
Access Point clusters typically use three frequencies 20 MHz apart. In a six-sector base station,
these frequencies are typically reused with the same frequency being used in back-to-back
sectors. For collocation, use one end of the band for the Access Point cluster (or 10 Mb or 20
Mb Backhauls), and the other end of the band for the 30/60 Mbps Backhaul(s), with at least 25
MHz between the top group of frequencies and the bottom group of frequencies.
Issue 3.1, July 2006
Page 36 of 162
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