User's Manual

Backhaul User Manual Draft for Regulatory Review

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Channel Plans

Whether using 2.4, 5.2, or 5.7 GHz modules, frequencies should never be placed closer

than 20 MHz. 5.2 and 5.7 GHz modules allow the operator to chose frequencies every 5

MHz. 2.4 GHz modules allow the operator to chose frequencies every 2.5 MHz. This is

so that in the event of co-location with other equipment the operator can customize the

channel layout for interoperability.

Backhauls and APs operating in the same frequency band (within the 2.4 GHz band, within the 5.2

GHz band, or within the 5.7 GHz band) need 100 feet (30 m) of physical separation, as their

different transmit and receive frame structures otherwise would cause interference.

2.4 GHz Recommended Frequencies

The following are the 3 non-overlapping channels that are recommended by the Canopy team for

use with the backhaul module:

• 2.415 GHz

• 2.435 GHz

• 2.4575 GHz

Note this gives 20 MHz of separation between one pair of channels, and 22.5 MHz of separation

between the other pair. Depending on the RF environment you are operating in, you may want to

put the middle channel at 2.4375 GHz and give additional separation between it and the 2.435 GHz

channel, or move the top channel down to 2.455, or the bottom channel up to 2.4175, as long as

you maintain at least 20 MHz of separation between channels. You can use the Spectrum Analysis

feature in an SM or BHS, or a standalone spectrum analyzer, to help evaluate the RF environment

and guide you in site-specific frequency engineering.

5.2 GHz Recommended Frequencies

The following are the 3 non-overlapping channels that are recommended for use with the backhaul

module:

• 5.275 GHz

• 5.300 GHz

• 5.325 GHz

5.7 GHz Recommended Frequencies

The following are the 6 non-overlapping channels that are recommended for use with the backhaul

module when the ISM frequencies are available:

• 5.735 GHz

• 5.755 GHz

• 5.775 GHz

• 5.795 GHz

• 5.815 GHz

• 5.835 GHz

20 Mbps backhaul modules have less “margin” at the edges of their 20 MHz channel. When using