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Looking in more detail at the minimum RTTs from SLAC to Bangladesh see the plot below showing the cut-over for the RU university in on 11 October 2006 around 7:00am UDT.
Unreachability
If none of the pings sent each half hour respond then the target remote host is deemed unreachable. The plot below shows the monthly unreachability seen from SLAC to Bangladeshi hosts.
Jitter
This is typically an edge effect.
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