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On Aug 1, 2009 at about 23:00 hours GMT the RTTs averaged over a day, from SLAC to www.ternet.or.tz changed from about 730ms to about 350ms (see below, note that the RTTs are truncated at about 900ms ). After about half a day it reverted back again. The traceroute when the RTT had reverted back to the high RTT value shows the route going through Telia and Newskies, a satellite services provider. The traceroute when the RTT was low was via ESnet to San Joze where it was picked up by Teleglobe to take the traffic to London and thence to Tanzania where it was passed to Tanzania Telecommunications.
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