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Evaluation of QoE Reports RRS feed

  • Question

  • Hi,

     

    according to my last post I have couple of questions regarding QoE reports.

     

    1) Degradation values (Degradation, Degradation Jitter and Degradation Packet Loss)

     

    How are the figures caculated based on this following example:

     

    Network MOS 3,14

    Degradation 0,96

    Degradation Jitter 0,33

    Degradation Packet Loss 0,66             

     

    2) Packet lost

     

    Several different sources explain that a healthy network are design for 0,5% avarage lost of the packages.

     

    Compared to OCS 2007 Voice/Vidoe what is maximal suitable for this scenario? 10% lost or xx?

     

    2) Jitter

     

    The same question as for Packet lost, what is the maximal suitable figure for jitter? 

     

    3) Burst

     

    The same question as for Packet lost, what is maximal suitable figure for Burst? 

     

    I have researched in several different WhitePapers and find out an example as banchmark and need asistend to compare it to real figures for my scenario.

     

    Main Scenarios

    Packet loss

    Burstiness

    Jitter

    "Perfect NSQ” network

    Zero

    Zero

    Zero

    Typical enterprise network

    Low

    Low

    Medium

    Overloaded enterprise network

    Medium

    High

    Medium/High

    Multisite connectivity

    Medium

    High

    High

    Internet conditions

    High

    Medium

    High

     

    Thanks
    ABLO

    Thursday, August 28, 2008 7:07 AM

All replies

  • hi all,

     

    I found out the following figures for better understanding.

     

    Source: TechNet Webcast - Communications Server 2007 Quality of Experience Defending, Deploying, and Succeeding

     

    Other Network Considerations

     

    • Delay
      • ITU-TG.114 recommendations for mouth-to-aerlatency
        • < 150 ms is excellent
        • > 250 ms is problematic
        • > 400 ms is unacceptable
      • TIA-920 recommendation for wideband VoIP devices
        • Network latency should be < 50 ms to achieve < 150 m2e latency
    • Loss
      • - Up to 10% random loss can be handled without problems
    • Jitter
      • Up to 30 ms can be handled without significant problems

     

    thanks

    ABLO

    Monday, September 8, 2008 7:17 PM