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Satellite networks are often severely bandwidth-constrained and possess high latency. Links may be as narrow as 64K and possess latencies of 250, 500, 750 milliseconds or more. This combination of conditions often leads to congested satellite connections and performance so poor that applications frequently time out. One can attempt to address the delays by improving TCP by increasing buffer sizes to accomodate the long delays), modifying its congestion algorithm. One can also compress data and/or use streaming.
Cell Phones vs internet
Despite efforts to provide high-speed Internet Africa is falling behindthe rest of the world. Due to lack of infrastructure many African countries concentrate on mobile phones. Taking the figures in http://www.nytimes.com/imagepages/2007/07/21/business/22rwanda_graphic.html and assigning values by eye one can plot them as seen below:
Mobile vs Internet Subscribers for Africa |
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Regional Comparisons
Inter Regional Traffic | Price Variation | Subscribers |
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Normalized Throughput as | Normalized Throughput as |
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Cell Phones
Miscellaneous Statistics
Loss Quality as seen from SLAC | Loss Quality vs Population |
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MinRTT, AvgRTT, Packet Loss, | Derived Throughput (Kbps) |
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