User Guide Part 2

18 7signal solution 97
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7signal Sapphire Carat User Guide Release 5.0
Figure 56: VoIP MOS test result graphs (bottom)
Elements of the results image:
• MOS result: The distribution of MOS values related to test duration. The color coding
indicates quality.
• Loss Rate: Packet loss as a function of test duration.
• Average Jitter: Variation in delay as a function of test duration.
• Codec: The distribution of codecs used during the test. If only one result is visible, the
codec was not changed during the test.
• Levels: Signal and noise levels during the test, averaged over the duration of the test.
• SNR: Signal/noise ratio during the test, averaged over the duration of the test.
Table 12: MOS values
Test result
5
Excellent
4
Good
3
Fair
2
Poor
1
Bad
In practice, the supported codec’s can reach MOS scores that are slightly above 4.