Version 7.2 303 Mediant 1000B Gateway & E-SBC
User's Manual 16. Quality of Experience
bandwidth threshold. When bandwidth goes over the threshold, the device considers it
a Red state (Major alarm severity); when it goes below the threshold, it considers it a
Yellow state (Minor alarm severity).
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).
Hysteresis is configured as a percentage of the configured major (total) bandwidth
threshold.
The following example is used to explain how the device considers threshold crossings.
The example is based on a setup where the Major (total) bandwidth threshold is configured
to 64,000 Kbps, the Minor threshold to 50% (of the total) and the hysteresis to 10% (of the
total):
Figure 16-5: Bandwidth Threshold Crossings
Table 16-4: Threshold Crossings based on Threshold and Hysteresis
Threshold Crossing Calculation
Threshold based on
Example
Green to Yellow (Minor alarm) The change occurs if the current bandwidth
crosses the configured Minor threshold only
(i.e., hysteresis is not used).
32,000 Kbps
Green to Red (Major alarm) The change occurs if the current bandwidth
crosses the configured Major threshol
(i.e., hysteresis is not used).
64,000 Kbps
Yellow to Red (Major alarm) The change occurs if the current bandwidth
crosses the configured Major threshold only
(i.e., hysteresis is not used).
64,000 Kbps
Red to Yellow (Minor alarm) The change occurs if the current bandwidth
crosses the configured Major threshold with
hysteresis.
57,600 Kbps
[64,000 - (10% x
64,000)]
Yellow to Green (alarm
cleared)
The change occurs if the current bandwidth
crosses the configured Minor threshold with
hysteresis.
25,600 Kbps
[32,000 - (10% x
64,000)]
Red to Green (alarm cleared) The change occurs if the current bandwidth
crosses the configured Minor threshold with
hysteresis.
25,600 Kbps
[32,000 - (10% x
64,000)]
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