Cambium PTP 670 Series, Руководство пользователя

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Chapter 7: Operation Spectrum Management
Page 7-39
Metric Description How represented
Mean of Means The arithmetic mean of the measured means
during a quantization period. The mean of means
is a coarse measure of signal interference and
gives an indication of the average interference
level measured during the quantization period.
The metric is not very good at predicting
intermittent interference and is included to show
the spread between the Mean of Means, the
99.9% Percentile and the Peak of Means. Lower horizontal
bar.
99.9% Percentile
of the Means The value of mean interference measurement
which 99.9% of all mean measurements fall
below, during the quantization period. The 99.9%
percentile metric is useful for detecting short
duration repetitive interference that by its very
nature has a minimal effect of the mean of means. Top of the colored
bar.
Realtime
interference level The arithmetic mean of the power measured
during the last quantization period. The
quantization period is two seconds. Countinuous line.
Spectrum Expert page in fixed frequency mode
When the link is operating in fixed frequency mode, the Spectrum Expert page uses two visual
cues (
Figure 225 ). The main page title has the “
Fixed Frequency Mode
” suffix and the
selected channels are identified by a red capital “
F
”.