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Another view of the effect of the RTT increases is seen in the plot below of the median RTTs measured (thed error bars are the 25% and 75%-tiles) from 3 monitoring hosts in Pakistan (NUST, COMSATS and NCP) to FNAL and SLAC (i.e. 6 pairs of monitor/remote hosts) for the first 19 days of December 2008.
Median RTT | Median of AvgRTT from Pakistan to North America |
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Jitter
We measure the jitter as the Inter Packet Delay Variability (IPDV) (see Tutorial). The plots below show the RTT and Loss plus the IPDV and maximum and minimum (of 10 pings) measured for a host (Sudan University of Science and Technology (SUSTECH)) in the Sudan. The dramatic increases in RTT, jiiter and losses are clearly seen foillowing the December 19th cable cuts. The graph on the right shows the drop in throughput derived from the average RTTs and losses as:
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