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Home > Success Center > VoIP & Network Quality Manager (VNQM) > Calculating jitter, packet loss, and latency

Calculating jitter, packet loss, and latency

Overview

This article details how VoIP and Network Quality Manager calculates jitter, packet loss, and latency.

Environment

VNQM, all versions

Details

Jitter

jitterSD = (rttMonLatestJitterOperSumOfPositivesSD + rttMonLatestJitterOperSumOfNegativesSD ) / (rttMonLatestJitterOperNumOfPositivesSD + rttMonLatestJitterOperNumOfNegativesSD)
jitterDS = (rttMonLatestJitterOperSumOfPositivesDS + rttMonLatestJitterOperSumOfNegativesDS) / (rttMonLatestJitterOperNumOfPositivesDS + rttMonLatestJitterOperNumOfNegativesDS)
Jitter = (rttMonLatestJitterOperSumOfPositivesSD + rttMonLatestJitterOperSumOfNegativesSD + rttMonLatestJitterOperSumOfPositivesDS + rttMonLatestJitterOperSumOfNegativesDS) / (rttMonLatestJitterOperNumOfPositivesSD + rttMonLatestJitterOperNumOfNegativesSD + rttMonLatestJitterOperNumOfPositivesDS + rttMonLatestJitterOperNumOfNegativesDS
rttMonLatestJitterOperSumOfPositivesSD 1.3.6.1.4.1.9.9.42.1.5.2.1.9
rttMonLatestJitterOperSumOfNegativesSD 1.3.6.1.4.1.9.9.42.1.5.2.1.14
rttMonLatestJitterOperNumOfPositivesSD 1.3.6.1.4.1.9.9.42.1.5.2.1.8
rttMonLatestJitterOperNumOfNegativesSD 1.3.6.1.4.1.9.9.42.1.5.2.1.13
rttMonLatestJitterOperSumOfPositivesDS 1.3.6.1.4.1.9.9.42.1.5.2.1.19
rttMonLatestJitterOperSumOfNegativesDS 1.3.6.1.4.1.9.9.42.1.5.2.1.24
rttMonLatestJitterOperNumOfPositivesDS 1.3.6.1.4.1.9.9.42.1.5.2.1.18
rttMonLatestJitterOperNumOfNegativesDS 1.3.6.1.4.1.9.9.42.1.5.2.1.23

Packet loss

if (rttMonLatestJitterOperPacketLossSD + rttMonLatestJitterOperPacketLossDS + rttMonLatestJitterOperPacketMIA <> 0)
packetLoss =
((rttMonLatestJitterOperPacketLossSD + rttMonLatestJitterOperPacketLossDS + rttMonLatestJitterOperPacketMIA) * 100) / (rttMonLatestJitterOperPacketLossSD + rttMonLatestJitterOperPacketLossDS + rttMonLatestJitterOperPacketMIA + rttMonLatestJitterOperPacketLateArrival + rttMonLatestJitterOperPacketOutOfSequence + rttMonLatestJitterOperNumOfRTT)
else
packetLoss = 0
if (rttMonLatestJitterOperPacketLossSD + (rttMonLatestJitterOperPacketMIA/2) + ((rttMonLatestJitterOperPacketLateArrival + rttMonLatestJitterOperPacketOutOfSequence + rttMonLatestJitterOperNumOfRTT)/2) <> 0)
packetLossSD = (rttMonLatestJitterOperPacketLossSD + (rttMonLatestJitterOperPacketMIA/2) + ((rttMonLatestJitterOperPacketLateArrival + rttMonLatestJitterOperPacketOutOfSequence + rttMonLatestJitterOperNumOfRTT)/2)) * 100 / (rttMonLatestJitterOperPacketLossSD + (rttMonLatestJitterOperPacketMIA/2))
else
packetLossSD = 0
if (rttMonLatestJitterOperPacketLossDS + (rttMonLatestJitterOperPacketMIA/2) + ((rttMonLatestJitterOperPacketLateArrival + rttMonLatestJitterOperPacketOutOfSequence + rttMonLatestJitterOperNumOfRTT)/2) <> 0)
packetLossDS = (rttMonLatestJitterOperPacketLossDS + (rttMonLatestJitterOperPacketMIA/2) + ((rttMonLatestJitterOperPacketLateArrival + rttMonLatestJitterOperPacketOutOfSequence + rttMonLatestJitterOperNumOfRTT)/2)) * 100 / (rttMonLatestJitterOperPacketLossDS + (rttMonLatestJitterOperPacketMIA/2))
else
packetLossDS = 0
rttMonLatestJitterOperPacketLossSD 1.3.6.1.4.1.9.9.42.1.5.2.1.26
rttMonLatestJitterOperPacketLossDS  1.3.6.1.4.1.9.9.42.1.5.2.1.27
rttMonLatestJitterOperPacketMIA 1.3.6.1.4.1.9.9.42.1.5.2.1.29
rttMonLatestJitterOperPacketLateArrival 1.3.6.1.4.1.9.9.42.1.5.2.1.30
rttMonLatestJitterOperPacketOutOfSequence 1.3.6.1.4.1.9.9.42.1.5.2.1.28
rttMonLatestJitterOperNumOfRTT 1.3.6.1.4.1.9.9.42.1.5.2.1.1

Latency

if (rttMonLatestJitterOperNumOfRTT <> 0)
delay = (convert rttMonLatestJitterOperRTTSum to milli/microseconds depending on rttMonEchoAdminPrecision) / rttMonLatestJitterOperNumOfRTT
else
delay = 0
if (micro/milli second convert value of rttMonLatestJitterOperOWSumSD and rttMonLatestJitterOperNumOfOW has value and rttMonLatestJitterOperNumOfOW <> 0)
delaySD = micro/milli second convert value of rttMonLatestJitterOperOWSumSD / rttMonLatestJitterOperNumOfOW
else
if (micro/milli second convert value of rttMonLatestJitterOperOWSumDS and rttMonLatestJitterOperNumOfOW has value and rttMonLatestJitterOperNumOfOW <> 0)
delayDS = micro/milli second convert value of rttMonLatestJitterOperOWSumDS / rttMonLatestJitterOperNumOfOW
else
delaySD & delayDS = null
rttMonLatestJitterOperNumOfRTT 1.3.6.1.4.1.9.9.42.1.5.2.1.1
rttMonLatestJitterOperRTTSum  1.3.6.1.4.1.9.9.42.1.5.2.1.2
rttMonEchoAdminPrecision 1.3.6.1.4.1.9.9.42.1.2.2.1.37
rttMonLatestJitterOperOWSumSD  1.3.6.1.4.1.9.9.42.1.5.2.1.33
rttMonLatestJitterOperNumOfOW  1.3.6.1.4.1.9.9.42.1.5.2.1.41
rttMonLatestJitterOperOWSumDS  1.3.6.1.4.1.9.9.42.1.5.2.1.37

Last modified
16:26, 16 Jun 2016

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