This reports the Average Inter-Frame Delay Variation (IFDV, the Y.1731 term for average packet-delay-variation/jitter measured between consecutive test frames rather than against a fixed reference), in microseconds, from a completed delay-measurement test. An admin treats this as a distinct metric from the simpler 'average jitter' field elsewhere in the same table, since IFDV specifically measures frame-to-frame delay differences per the ITU-T Y.1731 methodology, which some monitoring tools and SLAs specifically require over a generic jitter calculation. For example, an SLA written to reference ITU-T Y.1731 IFDV specifically would need this cienaCesCfmDelayMsgAverageDelayVariation field checked, rather than the separately reported average jitter figure, to be technically compliant with the contract language.