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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

The below are the calculations that are conducted within VNQM for Jitter, Packet Loss and Latency:

 

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
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