AudioCodes Mediant 4000 SBC, User Manual

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CHAPTER 17 Quality of Experience
Mediant 4000 SBC | User's Manual
Parameter Description
■ Echo measures the Residual Echo Return Loss (RERL) in dB.
'Minor Hysteresis
(Yellow)'
minor-hysteresis-
yellow
[QOEColorRules_
MinorHysteresis]
Defines the amount of fluctuation (hysteresis) from the Minor
threshold, configured by the 'Minor Threshold (Yellow)' parameter
in order for the threshold to be considered as crossed. The
hysteresis is used only to determine threshold crossings to Green
(i.e., from Yellow to Green, or Red to Green). In other words, the
device considers a threshold crossing to Green only if the
measured voice metric crosses the Minor threshold and the
hysteresis.
For example, if you configure the 'Minor Threshold (Yellow)'
parameter to 4 and the 'Minor Hysteresis (Yellow)' parameter to 0.1
(for MOS), the device considers a threshold crossing to Green only
if the MOS crosses 4.1 (i.e., 4 + 0.1).
'Major Threshold (Red)'
major-threshold-
red
[QOEColorRules_
MajorThreshold]
Defines the Major threshold value, which is the upper threshold
located between the Yellow and Red states. To consider a
threshold crossing:
■ Increase in severity (i.e., Yellow to Red): Only this value is
used.
■ Decrease in severity (Red to Yellow): This value is used
with the hysteresis, configured by the 'Major Hysteresis (Red)'
parameter (see below).
The valid threshold values are as follows:
■ MOS values are in multiples of 10. For example, to denote a
MOS of 3.2, the value 32 (i.e., 3.2*10) must be entered.
■ Delay values are in msec.
■ Packet Loss values are in percentage (%).
■ Jitter is in msec.
■ Echo measures the Residual Echo Return Loss (RERL) in dB.
'Major Hysteresis (Red)'
major-hysteresis-
red
[QOEColorRules_
MajorHysteresis]
Defines the amount of fluctuation (hysteresis) from the Major
threshold, configured by the 'Major Threshold (Red)' parameter in
order for the threshold to be considered as crossed. The hysteresis
is used only to determine threshold crossings from Red to Yellow.
In other words, the device considers a threshold crossing to Yellow
only if the measured voice metric crosses the Major threshold and
the hysteresis.
For example, if you configure the 'Major Threshold (Red)'
parameter to 2 and the 'Major Hysteresis (Red)' parameter to 0.1
(for MOS), the device considers a threshold crossing to Yellow
only if the MOS crosses 2.1 (i.e., 2 + 0.1).
Configuring Bandwidth Profiles
The Bandwidth Profile table lets you configure up to 1,009 Bandwidth Profiles. A Bandwidth Profile
defines bandwidth utilization thresholds for audio and/or video traffic (incoming and outgoing),
which if crossed can result in various actions (discussed later in the section). Bandwidth Profiles
enhance the device's monitoring of bandwidth utilization.
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