Agilent Technologies N2620A user manual Interpreting Results

Voice Testing with the FrameScope Pro 3

Interpreting Results

Interpreting Results

The statistics measured are plotted in graphical format. The graph is plotted offline with timing info displayed as iterations (the interval is 500 ms) in X-axis and R-Factor, MOS, Packet Loss Ratio, Packet Round Trip delay, Inter Arrival Jitter values in Y-axis.

Each iterations shown is based on the RTCP message exchange during the VoIP test.

•The Inter-arrival jitter, Total Packet Loss and Packet Loss Ratio are based on the received RTP packets. Round trip delay is based on other part RTCP packet information,

•R-FACTOR, MOS are based on Inter-arrival jitter, total packet loss and packet loss ratio and Round trip delay, if the other part has no RTCP packet sent, then the Round Trip Delay will set to zero.

•Total Packets Sent are counts packets sent from the FrameScope Pro which is displaying the results and not from the other party.

•Total Packet Lost. This is based on "Cumulative Number of Packets Lost" in RFC1889/3550.

•Packet Loss Ratio. This is based on "Fraction Lost" in RFC 1889/3550

•Total Packets DiscardedTotal Packets Discarded refers to the number of packet dropped at the receiving side if there are erros in RTP header information,

•Packet Discard Ratio.This refers to the interval Packet Discard Ratio, which is the discarded packet ratio for each RTCP interval.

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