User manual

SM User Manual January 2004
Software Release 4.1
A BH and an AP on the same tower, or separated by less than 100 feet (30 meters), require a
CMM. The CMM properly synchronizes all Canopy modules to prevent interference and desensing
of the modules.
NOTE: Cross-band deployment of APs and BH is the recommended alternative (for
example, a 5.2-GHz AP collocated with 5.7-GHz BH).
5.6.2 Spectrum Analysis
In Release 4.1 and later releases, the operator can
• use an SM as a spectrum analyzer.
• view a table that shows power level in RSSI and dBm for each frequency throughout
the entire 20-MHz range, regardless of limited selections in the Custom RF
Frequency Scan Selection List field of the Configuration page.
• select an AP channel that minimizes interference from other RF equipment.
This functionality can be used during the alignment of an SM, but is especially helpful for frequency
selection during site planning.
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 after a 15-minute
interval has elapsed.
Procedure 6: Enabling spectrum analysis
The Spectrum Analyzer in SM and BHS feature provides this functionality. To enable this
functionality, the operator performs the following steps:
1. Access the Expanded Stats page of the SM.
2. On the Expanded Stats page, click Spectrum Analyzer.
3. On the Spectrum Analyzer page, click Enable.
RESULT: The feature is enabled.
4. Click Enable again.
RESULT: The system measures RSSI and dBm for each frequency.
5. Repeatedly click Enable.
RESULT: The system repeats the measurement and refreshes the displayed data until the
spectrum analysis mode times out, 15 minutes after the mode was invoked in Step 3.
5.6.3 Power Reduction to Mitigate Interference
In Release 4.1 and later releases, where any module (SM, AP, BH timing master, or BH timing
slave) is close enough to another module that self-interference is possible, the operator can set the
SM to operate at 18 dB less than full power.
The following procedure can cause the SM to drop an active RF link to a module that is
too far from the low-power SM. If a link is dropped when Power Control is set to low, the
link can be re-established by only Ethernet access.
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