Datasheet

Table Of Contents
CHAPTER 6
Measuring VQoS
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Vpacket 5100/6100 Series Web Interface Manual
This window is divided into three informational (read-only) panels:
The Call Session lists information specific to this call, captured from the previous VOICE
QOS MONITOR RESULTS Window, adding the Round Trip Delay value.
Near End Displays the Voice QoS data for the near-end termination of the call session.
The Voice QoS score rates the quality of the call similar to the Mean Opinion Score
(MOS) with 5 representing the highest quality and 1 the lowest.
Far End Displays the Voice QoS data for the far-end termination of the call session. The
Voice QoS score rates the quality of the call similar to the Mean Opinion Score (MOS)
with 5 representing the highest quality and 1 the lowest.
The two evaluation devices are the VQM Score and the MOS Estimate.
VQM ranks voice quality on a 0–6 range with the lower value showing higher quality.
MOS ranks voice quality on a 1–5 range with the higher value showing higher quality.
Testing voice quality from a specific 6100 VDR
Voice Quality Monitoring (VQM) is the ability to test specific links and view the test results. You
can test call quality to a specific destination number offline. Tests take approximately 20 seconds.
During the test the 6100 VDR sends a balanced synthetic voice sample to the remote site. The
6100 VDR compares the received sample to the original sample and assigns a quality score. This
type of VQM testing provides an accurate quality measure.
To test voice quality of a specific link
1. Click voice QOS and then click test control.
2. Enter a phone number in the Phone number field (Figure 6-5).
Figure 6-5. Voice QoS Test Control window
3. Click Submit.