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Voice Scores
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Indicates that Voice over IP statistics appear on the following lines. Voice score data is computed when the operation type is configured as type jitter (codec).
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ICPIF
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The Calculated Planning Impairment Factor (ICPIF) value for the operation. The ICPIF value is computed by IP SLAs using the formula Icpif = Io + Iq + Idte + Idd + Ie - A, where
• The values for Io, Iq, and Idte are set to zero.
•The value Idd is computed based on the measured one-way delay.
•The value Ie is computed based on the measured packet loss.
•The value of A is specified by the user.
ICPIF values are expressed in a typical range of 5 (very low impairment) to 55 (very high impairment). ICPIF values numerically lower than 20 are generally considered "adequate."
Note This value is intended only for relative comparisons, and may not match ICPIF values generated using alternate methods.
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MOS Score
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The estimated Mean Opinion Score (Conversational Quality, Estimated) for the latest iteration of the operation. The MOS-CQE is computed by IP SLAs as a function of the ICPIF.
MOS values are expressed as a number from 1 (1.00) to 5 (5.00), with 5 being the highest level of quality, and 1 being the lowest level of quality. A MOS value of 0 (zero) indicates that MOS data could not be generated for the operation.
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RTT Values
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Indicates that round-trip-time statistics appear on the following lines.
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NumOfRTT
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The number of successful round-trips.
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RTTSum
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The sum of all successful round-trip values (in milliseconds).
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RTTSum2
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The sum of squares of those round-trip values (in milliseconds).
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PacketLossSD
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The number of packets lost from source to destination.
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PacketLossDS
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The number of packets lost from destination to source.
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PacketOutOfSequence
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The number of packets returned out of order.
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PacketMIA
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The number of packets lost where the direction (SD/DS) cannot be determined.
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PacketLateArrival
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The number of packets that arrived after the timeout.
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InternalError
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The number of times an operation could not be started due to other internal failures.
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Busies
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The number of times this operation could not be started because the previously scheduled run was not finished.
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Jitter Values:
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Indicates that jitter statistics appear on the following lines. Jitter is interpacket delay variance.
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NumOfJitterSamples
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The number of jitter samples collected. This is the number of samples that are used to calculate the following jitter statistics.
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MinOfPositivesSD
MaxOfPositivesSD
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The minimum and maximum positive jitter values from source to destination, in milliseconds.
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NumOfPositivesSD
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The number of jitter values from source to destination that are positive (that is, network latency increases for two consecutive test packets).
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SumOfPositivesSD
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The sum of those positive values (in milliseconds).
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Sum2PositivesSD
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The sum of squares of those positive values.
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MinOfNegativesSD
MaxOfNegativesSD
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The minimum and maximum negative jitter values from source to destination. The absolute value is given.
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NumOfNegativesSD
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The number of jitter values from source to destination that are negative (that is, network latency decreases for two consecutive test packets).
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SumOfNegativesSD
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The sum of those values.
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Sum2NegativesSD
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The sum of the squares of those values.
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Interarrival jitterout
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The source-to-destination (SD) jitter value calculation, as defined in RFC 1889.
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Interarrival jitterin
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The destination-to-source (DS) jitter value calculation, as defined in RFC 1889.
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One Way Values
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Indicates that one-way measurement statistics appear on the following lines.
One Way (OW) values are the amount of time required for the packet to travel from the source router to the target router (SD) or from the target router to the source router (DS).
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NumOfOW
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Number of successful one-way time measurements.
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OWMinSD
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Minimum time (in milliseconds) from the source to the destination.
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OWMaxSD
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Maximum time (in milliseconds) from the source to the destination.
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OWSumSD
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Sum of the OWMinSD and OWMaxSD values.
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OWSum2SD
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Sum of the squares of the OWMinSD and OWMaxSD values.
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