Cambium Networks cnReach N500, User Manual

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cnReach N500 User Guide System Configuration
phn-4673_003v000 (November 2018)
2-58
Cur Rx Percent is the current communications success rate.
The Freq column specifies the channel frequency. Refer to Hop Tables for channel frequencies per
modulation.
When assessing Noise, look at “Average” as opposed to “Max”. ISM Noise levels vary depending on how
many radio systems are in the vicinity and how their hopping pattern and timing parameters are
configured. ISM is License Free which makes it a popular choice and although most systems use
hopping technology to coexist in the same spectrum, noise can become an issue in high traffic areas
with multiple overlaid systems.
Sampling the noise floor at various locations on a prospective network is something that Cambium
Networks recommends as part of the link design process. The more the system designer knows about
the RF environment, the better engineered the system can be.
Attention
Installing radio systems without sampling the noise floor can, in some cases, lead to
unexpected performance. Cambium Networks recommends sampling the noise floor or at
least making an allowance for a higher than expected noise floor in the link budget.
When assessing Signal look at the “Average” as opposed to “Max”. Consult the RSSI scale to ensure
the signal isn’t too weak or too strong; see how to tune RSSI.
Fwd-Pwr is the output transmit power of the radio and should represent the transmit power setting
Radio/RF Settings.
Reverse Pwr is the reflected power coming back into the radio from the transmission system and
should be =<10% of Fwd-Pwr.
Attention
High Rev-Pwr indicates elevated
VSWR
, which usually means damaged coax, a faulty
connector or water ingress (either in the coax or connector).
Coaxial connectors, coaxial cables, antennas and then the radio should be checked.
% Occupancy indicates the % of the time the radio went to transmit on the specified frequency and the
noise measured was above the Diagnostic Threshold.
PA Current is the current being drawn by the Power Amplifier, in mA.
Diagnostics/RF Ping
The RF Ping Utility enables the direct testing of connectivity and signal quality between an Access Point and a remote End
Point. The test can be initiated from either side of the link.