JnxRpmMeasurementType

• Base type Enumeration

For each individual probe, several different measurements can be made. These include the following (all measurements are provided in units of microseconds): roundTripTime -- this is the delay between the the transmission of a probe and the arrival of its response. rttJitter -- this is the difference between the current round trip time measurement and the previous one. rttInterarrivalJitter -- An estimate of the statistical variance of a packet's interarrival time. Defined in rfc1889 as: J=J+(|D(i-1,i)|-J)/16 where J is the interarrival jitter and D(i-1, i) is the current round trip jitter measurement. egress -- this is the delay beween the transmission of a probe and its arrival at its destination. egressJitter -- this is the difference between the current egress delay the previous measurement. egressInterarrivalJitter -- similar to rttInterarrivalJitter, but applied to egress jitter measurements. ingress -- this is the delay between the transmission of a probe response and its arrival at its destination. ingressJitter -- this is the difference between the current ingress delay and the previous measurement. ingressInterarrivalJitter -- similar to rttInterarrivalJitter, but applied to ingress jitter measurements. Note, not all types of measurements will be performed for every probe. The jitter measurements are available only for those RPM entries that employ hardware timestamps. Further, the ingress & egress measurements are available only for those probe types that measure one-way delays or where hardware timestamps are employed and the one-way-hardware timestamp knob is enabled. In either case, the one-way delays must be less than the round trip times, otherwise they are discarded. Also note, due to clock synchronization artifacts, many one-way jitter measurements & calculations may include signifacant variations, in some cases orders of magnitude greater than the round trip times. Because of this, one-way jitter measurements will only be performed on samples which are less than 10 seconds apart.