AudioCodes Mediant 1000B User Manual page 321

User's Manual
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):
Table 16-4: 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)
Yellow to Green (alarm
cleared)
Red to Green (alarm cleared)
Version 7.2
Figure 16-5: Bandwidth Threshold Crossings
Calculation
The change occurs if the current bandwidth
crosses the configured Minor threshold only
(i.e., hysteresis is not used).
The change occurs if the current bandwidth
crosses the configured Major threshold only
(i.e., hysteresis is not used).
The change occurs if the current bandwidth
crosses the configured Major threshold only
(i.e., hysteresis is not used).
The change occurs if the current bandwidth
crosses the configured Major threshold with
hysteresis.
The change occurs if the current bandwidth
crosses the configured Minor threshold with
hysteresis.
The change occurs if the current bandwidth
crosses the configured Minor threshold with
hysteresis.
321 Mediant 1000B Gateway & E-SBC
16. Quality of Experience
Threshold based on
Example
32,000 Kbps
64,000 Kbps
64,000 Kbps
57,600 Kbps
[64,000 - (10% x
64,000)]
25,600 Kbps
[32,000 - (10% x
64,000)]
25,600 Kbps
[32,000 - (10% x
64,000)]