AudioCodes Mediant 4000 SBC User Manual page 715

User's Manual
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Major Threshold (Red): Higher threshold that indicates changes from Green or
Yellow to Red.
The device also uses hysteresis to determine whether the threshold has indeed being
crossed. Hysteresis defines the amount of fluctuation from the threshold in order for the
threshold to be considered as crossed (i.e., change in color state). Hysteresis is used to
avoid false reports being sent by the device. Hysteresis is used only for threshold crossings
toward a lesser severity (i.e., from Red to Yellow, Red to Green, or Yellow to Green).
The following example is used to explain how the device considers threshold crossings.
The example is based on the ASR of a call, where the Major threshold is configured to
70%, the Minor threshold to 90% and the hysteresis for both thresholds to 2%:
Table 48-1: Threshold Crossings based on Threshold and Hysteresis
Threshold Crossing
Green to Yellow (Minor alarm)
Green to Red (Major alarm)
Yellow to Red (Major alarm)
Red to Yellow (Minor alarm)
Red to Green (alarm cleared)
Yellow to Green (alarm
cleared)
Version 7.2
Figure 48-3: Example of Threshold Crossings (ASR)
The change occurs if the measured metric
crosses the configured Minor threshold only
(i.e., hysteresis is not used).
The change occurs if the measured metric
crosses the configured Major threshold only
(i.e., hysteresis is not used).
The change occurs if the measured metric
crosses the configured Major threshold only
(i.e., hysteresis is not used).
The change occurs if the measured metric
crosses the configured Major threshold with
hysteresis.
The change occurs if the measured metric
crosses the configured Minor threshold with
hysteresis.
The change occurs if the measured metric
crosses the configured Minor threshold with
hysteresis.
48. Viewing Performance Monitoring
Calculation
715
Threshold based on
Example
90%
70%
70%
72% (i.e., 70 + 2)
92 (i.e., 90 + 2)
92 (i.e., 90 + 2)
Mediant 4000 SBC