User guide

Canopy System User Guide Analyzing the RF Environment
pmp-0229 (Mar 2013)
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Analyzing the RF Environment
An essential element in RF network planning is the analysis of spectrum usage and the strength of
the signals that occupy the spectrum you are planning to use. Regardless of how you measure and
log or chart the results you find (through the Spectrum Analyzer in SM and BHS feature or by
using a spectrum analyzer), you should do so
• at various times of day.
• on various days of the week.
• periodically into the future.
As new RF neighbors move in or consumer devices in your spectrum proliferate, this will keep
you aware of the dynamic possibilities for interference with your network.
Mapping RF Neighbor Frequencies
These modules allow you to
• use an SM or BHS (or a BHM reset to a BHS), or an AP that is temporarily transformed into
an SM, as a spectrum analyzer.
• view a graphical display that shows power level in RSSI and dBm at 5-MHz increments
throughout the frequency band range, regardless of limited selections in the Custom Radio
Frequency Scan Selection List parameter of the SM.
• select an AP channel that minimizes interference from other RF equipment.
The SM measures only the spectrum of its manufacture. So if, for example, you wish to analyze an
area for both 2.4- and 5.7-GHz activity, take both a 2.4- and 5.7-GHz SM to the area. To enable
this functionality, perform the following steps:
CAUTION!
The following procedure causes the SM to drop any active RF link. If a link is
dropped when the spectrum analysis begins, the link can be re-established when
either a 15-minute interval has elapsed or the spectrum analyzer feature is
disabled.
Procedure 2: Analyzing the spectrum
1. Predetermine a power source and interface that will work for the SM or BHS in
the area you want to analyze.
2. Take the SM or BHS, power source, and interface device to the area.