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The measurements were made:
- between pinger.slac.stanford.edu and pinger-raspberry.slac.stanford.edu
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- from both pinger.slac.stanford.edu and pinger-raspberry.slac.stanford.edu to targets at varying distances and hence varying minimum RTTs from SLAC.
- from MAs at sitka.triumf.ca to pinger.slac.stanford.edu and pinger-raspberry.edu
The Directivity in the table provide below provides a measure of how direct the route is between the MA and target. The Directivity is given as:
Directivity = great circle distance between MA & target [in km] / (RTT [ms] * 100 [km/ms]
Information on the various hosts involved is given in the table below.
The Directivity is <= of 1, and a value of 1 means the RTT is the same as given by the speed of light in a fibre.
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Looking for significant differences in the measurements of the the more important metrics (minimum, average, median and jitter of RTT and the loss) measured by PingER that impact applications such as throughput, voice over IP, streaming video, haptics, estimating the geolocation of a host by pinging it from well know landmarks. Such differences might result in significant discontinuities in the metric measurements if we were to change the monitoring host.
In this report the jitter is represented by the Inter Packet Delay (IPD), the absolute values of the IPF (Abs(IPD)) and the Stdev(IPD).
Example target = pinger.unimas.my (~220 msec.)
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