Motorola PTP 500 User's Guide download pdf (Page 387)

100

101

PTP 300 and PTP 500 Series User Guide Managing spectrum

phn-1115_006v000

Sep 2010

7-27

Key metrics

The ‘I’ bar and top of the colored bar represent three key metrics (Table 7-8). The

vertical part of the ‘I’ bar represents the statistical spread between the peak and the

mean of the statistical distribution.

Table 7-8 Key metrics represented in the spectrum management plot

Metric Description How

represented

Peak of Means The largest mean interference measurement

encountered during the quantization period.

The peak of means is useful for detecting

slightly longer duration spikes in the

interference environment.

Upper horizontal

bar.

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.

NOTE

The arithmetic mean is the true power mean and not the mean of the values

expressed in dBm.

Spectrum Management uses the 99.9% Percentile as the prime interference

measurement. All subsequent references to interference level refer to this

percentile measurement.

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