Zhone 5100 用户指南

CHAPTER 6
Measuring VQoS

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.

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.

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.