NeBeez - Impact of jitter, packet loss, and latency on VoIP
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The document discusses metrics related to voice call quality, including latency, jitter, and packet loss. It provides specific measurements such as an average latency of 15 ms, 33% packet loss, and user satisfaction scores averaging 4.25. The formulas for effective latency and user satisfaction based on these parameters are also outlined.
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NeBeez - Impact of jitter, packet loss, and latency on VoIP
- 2. ● How long it takes for a voice packet to go from source to destination (includes encoding time) Internet3 2 1 3 2 1 15 ms
- 3. ● Variation in the delay of received packets Internet3 2 1 3 2 1 25 ms 15 ms
- 4. ● Dropped packets = voice gaps 3 2 1 3 1 Packet loss: 33%
- 5. ● User score of voice call 1-5 I give it 4 I give it 4.5 MOS: (4+4.5)/2 = 4.25
- 6. MOS Quality Impairment 5 Excellent Very Satisfied 4 Good Satisfied 3 Fair Some users dissatisfied 2 Poor Many users dissatisfied 1 Bad Nearly all users dissatisfied
- 7. EffectiveLatency = AverageLatency + Jitter * 2 + 10 if (EffectiveLatency < 160) R = 93.2 - (EffectiveLatency / 40) else R = 93.2 - (EffectiveLatency - 120) / 10 R = R - PacketLoss * 2.5 MOS = 1 + (0.035) * R + (0.000007) * R * (R-60) * (100-R) https://netbeez.net/blog/impact-of-packet-loss-jitter-and-latency-on-voip
- 8. Packet Loss vs. Jitter vs. Latency Latency Jitter
- 9. Packet Loss vs. Jitter vs. Latency Latency Jitter