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In the last formula, data is filtered on (before 1 July 1994 after 12 noon) or (after 1 July 1994 before
12 noon).
A formula follows this basic syntax:
Defining Threshold Formulas
Thresholds are used to trigger events (which are defined in the Event Manager). EliteView's
powerful Event Manager allows you to define an unlimited number of events corresponding to
specific actions. See the chapter 8, Managing Events for more information on defining event
response procedures.
EliteView's Log Manager uses thresholds to trigger an event. For example, a critical event can be
handled whenever CRC errors exceed 5 per minute.
To set thresholds triggering certain events,
1. Define an event using the Event Manager, specifying an Event Name and Event Action.
2. Define threshold limits using the Log Manager. Fill in the Threshold field with the appropriate
formula. Also fill in other necessary fields in the Log Information dialog box.
Threshold vs. Filter Formula
A threshold formula is very similar to the filter formula. In a threshold formula, the value of the data or
the data rate can be used. For example, a threshold formula can monitor value fluctuations based on
rates per second, per minute, or per hour.
Accuracy
Data rates greater than one per second are accurate. In computing data rates per second, the Log
Manager calculates an average between each two consecutive data units.
Threshold Formula
The threshold formula uses Backus-Naur Form (BNF) as follows:
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OLLECTING
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OG
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7-9
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