User's Manual
860
Document #: LTRT-10375
Mediant 500 MSBR
At any given time during a call, a voice metric can be in one of the following color-coded
quality states (as displayed by SEM):
Green:
Indicates good call quality
Yellow:
Indicates fair call quality
Red:
Indicates poor call quality
When the threshold of a voice metric is crossed, the device changes the alarm severity and
corresponding color-coded quality state of the call:
Minor Threshold (Yellow):
Lower threshold that indicates changes from Green or
Red to Yellow.
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%:
Figure
57-4: Example of Threshold Crossings (ASR)
Table
57-2: Threshold Crossings based on Threshold and Hysteresis
Threshold Crossing
Calculation
Threshold based on
Example
Green to Yellow (Minor alarm) The change occurs if the measured metric
crosses the configured Minor threshold only
(i.e., hysteresis is not used).
90%
Green to Red (Major alarm)
The change occurs if the measured metric
crosses the configured Major threshold only
(i.e., hysteresis is not used).
70%
Yellow to Red (Major alarm)
The change occurs if the measured metric
crosses the configured Major threshold only
(i.e., hysteresis is not used).
70%
Red to Yellow (Minor alarm)
The change occurs if the measured metric
crosses the configured Major threshold with
hysteresis.
72% (i.e., 70 + 2)
Summary of Contents for Mediant 500 MSBR
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Page 45: ...Part II Management Tools ...
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Page 115: ...Part III General System Settings ...
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Page 137: ...Part IV General VoIP Configuration ...
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Page 455: ...Part V Gateway Application ...
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Page 741: ...Part VII Cloud Resilience Package ...
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Page 751: ...Part VIII Data Router Configuration ...
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Page 757: ...Part IX Maintenance ...
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Page 837: ...Part X Status Performance Monitoring and Reporting ...
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Page 927: ...Part XI Diagnostics ...
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Page 977: ...Part XII Appendix ...
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