Figure T.02 - Test Measure Definition

The figure below illustrates more in-depth the relationship between the “TestMeasureDefinition” and the “MetricDefMeasure” and its association to the “MetricDefinition”. The “MetricDefinition” is a set of basic facts that defines, or specifies, what a metric is, such as its name, description, and so forth. As an example, “Frame Loss Ratio” might be such a metric. <br/>The “MetricDefMeasure”, and hence the “TestMeasureDefinition” through inheritance, defines the aspects relevant to the measurement of the metric. Such aspects include: unit of measure, the value type, and the period during which Metrics associated with a MetricDefMeasure are captured. The “TestMeasureDefinition” further refines the measurement to metrics associated to tests.<br/>If we take the example of a metric definition such as “Frame Loss Ratio” for a fixed interval (capture frequency), it will be calculated after every measurement interval configured and can be viewed whenever required. The unit of measure is percentage, where the % is the number of # frames lost / # frames sent. The capture method may indicate that this is a Y.1731 method of sending “Loss Measurement Messages” (LMM) and “Loss Measurement Replies”.<br/>