IBM 4.3-W manual ClusterMOS

Chapter 7: Collection Formulas

ClusterMOS

Type

Import

Description

The mean opinion score (MOS). This is a high-level metric.

In voice communications, particularly internet telephony, the MOS provides a numeric measure of the quality of human speech at the destination end of the circuit.

There is no algorithm for MOS calculations. This is a subjective metric based on the end-user’s judgment of call quality.

The scheme uses subjective scores that are mathematically averaged to obtain a quantitative indicator of the performance. To determine MOS, a number of listeners rate the quality of test sentences read aloud over the communications circuit by male and female speakers. Listeners give each sentence a rating as follows:

•1 (bad)

•2 (poor)

•3 (fair)

•4 (good)

•5 (excellent)

The MOS is the arithmetic mean of all the individual scores. It can range from 1 (worst) to 5 (best). In our context, our MOS calculation is based on the consolidation of Jitter, latency, and packets lost, which give a good overview of the real MOS value.

Syntax

#Bulk Metric

Generic Database Alias

None.

Formula Editor Path

AP > Specific > Bulk > VOIP > Cisco > CLUSTER

280 Netcool/Proviso Cisco IP Telephony Technology Pack User’s Guide, Version 4.3-W