Cambium Networks cnWave 5G Fixed, Руководство по эксплуатации и устранению неисправностей

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Troubleshooting cnWave™ 5G Fixed Platform of Products 31
Table 2 lists read-only parameters for the BTS and/or CPE that can be used to troubleshoot if a link
cannot be established between a BTS and a CPE. This is a minimal and non-exhaustive list before looking
in-depth at the event logs and contacting Cambium Networks
Support site for a resolution.
Table 2: Minimal list of read-only parameters
Parameter BTS CPE Description
EVM No Yes The EVM value goes up and down until the CPE finds
the BTS and settles to a value in the negative 20s,
which indicates a good link.
It is important to point out that the higher decibel
values represent the best error-free modulation
results. Example: An EVM of –40 dB is better than one
of –25 dB. In terms of percentage, –40 dB converts to
1% error while -25 dB translates to 5.6% error.
Rx Power Yes Yes The Rx Power level is the strength of the signal that is
received from a radio. The Rx Power number is
normally represented as a negative value (for
example, -41 dBm), It is important to remember that
the higher the negative value (further from zero), the
transmit signal is weaker. The lower the negative
value (closer to zero), the transmit signal is stronger.
For troubleshooting, it is recommended to monitor
this parameter and compare it with the Rx Signal
Level predicted by LINKPlanner at each end of the
link.
Ideally, the Rx level must be in the range of -18 to -25
dBm. If the Rx level is under -25 dBm, the Signal-to-
Noise Ratio (SNR) is likely to decrease, which means
that the performance of the link also decreases.
If a link cannot be established (even after following all the procedures described in this section), then
there may be a hardware problem. In such a scenario, you can swap the hardware equipment and restart
the procedures.