Agilent Technologies J3972A User's Guide download pdf (Page 487)

100

101

Historical Statistics

Using Baselines

486 5967–9446

as a single “bucket” or unit, and the baseline width determines the

“repeat” period, that is, it determines how the baseline intervals are

distributed into data sets.

The default baseline width is one week, and the default baseline interval

is eight hours, resulting in 21 separate data sets. Figure 101 gives a

pictorial representation of these defaults.

This baseline interval/width scheme ensures that daily and weekly

usage patterns are taken into account when calculating network base-

lines. For example, typically low Sunday utilization values would not

effect the utilization baseline calculated for Monday.

You can change the baseline interval and baseline widths with the

pmReporter command.

High and Low Baselines

For each data set, NetMetrix calculates high and low baselines for all

statistics using a default conﬁdence level of 99.8%, which means that

99.8% of actual measured values are between the low and high baseline

values. Each of the baselines is based on the data for the previous base-

line width (one week, by default).

Figure 101 Baseline Interval and Baseline Width

Each block

represents one

baseline interval

eight hours (16

consecutive

1800-second

intervals)

Each row represents

one

baseline width

one week

The data for a given

interval for each week

accumulates in the

same data set

…

Monday

week 1

Tuesday Sunday

week 2

week 3

…

data

set

data

set

data

set

data

set

data

set

data

set

data

set

data

set

data

set

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