Burst/Gap Count:
Number of bursts that occur on the voice stream
Avg Burst/Gap Loss rate:
The average percentage of MIUs lost and/or discarded during burst conditions
Avg Burst/Gap Length (ms):
The average burst length in ms
Avg Burst/Gap Length (pkts):
The average burst length in packets
Burst/Gap R:
The average listening R-factor for the gap periods
Avg. Loss Rate:
The total average percentage of MIUs lost and/or discarded
Avg. Net Loss Rate:
The total average percentage of MIUs lost in the network
Avg. Discard Rate:
The total average percentage of MIUs discarded
Packet Statistics - Delay Metrics
PPDV Jitter:
The packet-to-packet delay variation in milliseconds as defined in RFC 3550. The interarrival jitter is defined to
be the mean deviation of the difference in packet spacing at the receiver compared to the sender for a pair of packets.
If Si is the timestamp from packet i, and Ri is the time of arrival for packet i, then for two packets i and j, D(i,j) = (Rj - Ri) - (Sj -
Si).
The interarrival jitter is calculated continuously as each data packet i is received from source according to the formula J(i) =
J(i-
1) + (|D(i-1,i)| - J(i-1))/16.
MAPDV Jitter:
The true average mean-absolute packet delay variation in milliseconds. Per ITU-T G.1020.
If the nominal arrival time (denoted below ai) for a packet is known or can be determined then the absolute delay variation is
abs(ti - ai).
The mean absolute packet delay variation is therefore MAPDV = mean( abs(ti - ai) ).
Average PDV:
The running average mean-absolute packet delay variation in milliseconds. This average takes the difference
of the average positive and average negative envelopes. Per ITU-T G.1020.
Mean delay Di = (13.Di-1 + ti-1) / 16 positive deviation Pi = ti - Di if ti > Di negative deviation Ni = Di - ti if ti < Di MAPDV2 =
mean(Pi)+ mean(Ni).
Max PDV:
The maximum of the average mean-absolute packet delay variation in milliseconds.
13.2.5.3 VoIP Expert - IP Phone Mode
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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