EXFO EXpert IPTV Test Tools (FTB-1 / 2 Pro) - Manual (Page 61)

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Table below lists some of the perceptual quality metrics reported by VQmon/HD,
including acceptable ranges for each. (A complete list and description of the TVQM
Video Quality Metrics reported by VQmon/HD is provided in Appendix C.)
A.2.3.1 Mean Opinion Scores (MOS)
VQmon/HD reports estimated Mean Opinion Scores (MOS) for picture quality (MOS-V), audio
quality (MOS-A), and multimedia quality (MOS-AV) for each monitored video stream. MOS
scores range from 1 to 5, with 1 considered “Unacceptable” and 5 “Excellent.” MOS scores are
reported as instantaneous (per-frame), minimum, maximum, and average values. Interval
MOS scores are also reported as instantaneous and average values.