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The routes from SLAC to DUET and RU goes from SLAC and the San Francisco Bay Area to Dallas, Palermo Italy and thence to Bangladesh
Regions of the world seen from Daffodil Bangladesh
The column labeled BD below are the measurements of the various metrics made to other regions of the world from Daffodil for October 2014. Information on the meanings of the metrics can be found in the tutorial at http://www.slac.stanford.edu/comp/net/wan-mon/tutorial.html.
Derived TCP throughput
Derived_throughput = MSS /(RTT*sqrt(loss))
where MSS = Maximum Segment Size typically = 1460Bytes.
Average RTT
This mainly a function of the route length between the source and destination.
Loss
This is typically an edge effect.
Minimum RTT
This mainly a measure of the route length between the source and destination. All regions are reachable by terrestrial routes (i.e. no minimum RTT > 400ms).
Jitter
This is typically an edge effect.
Mean Opinion Score
This is a function of the average RTT, the packet loss and the jitter. It indicates how god a phone call is expted to be. Typically with MOS values above say 3.6 calls become acceptable. Thus VoIP calls should be of acceptable via the Internet between Daffodil and the regions in yelolw and green in the table below.
Directivity
How direct the route is between a source (monitor) and destination (monitored/remote) site is given by the directivity index. A value of 1 indicates that the route is a great circle route between the sites. Smaller values indicate the route is less direct. It is seen that the routes between Daffodil and North America and Latin America are the most direct with values of 0.42 and 0.45. Other routes are more indirect, with the route to South Asia being the least direct.t.
Round Trip times in Bangladesh
These are shown from daffodil to Daffodil and from Daffodil to Duet. Note the distance as crow flies between pinger.daffodilvarsity.edu.bd and www.duet.ac.bd = 189.2 km. or a minimum RTT (as constrained by speed of light in fibre) = 1.892. the average minimum RTT from Daffodil to Duet is 2.55msec. This corresponds to a Directivity of 0.74, i.e. the route is pretty direct. The spreadsheet of the data from which the plots below were derived is here.
