1 www.slac.stanford.edu/grp/scs/net/talk09/i2oct 09.ppt African Internet Performance, Fibres & the Soccer World Cup Prepared by: Les Cottrell SLAC , Umar Kalim SEECS,NUST/SLAC Presented at the Africa Regional Interest Group meeting Monday 5 th October 2009
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African Internet Performance, Fibres & the Soccer World Cup
African Internet Performance, Fibres & the Soccer World Cup. Prepared by: Les Cottrell SLAC , Umar Kalim SEECS,NUST/SLAC Presented at the Africa Regional Interest Group meeting Monday 5 th October 2009. www.slac.stanford.edu/grp/scs/net/talk09/i2oct09.ppt. Summary. Methodology - PowerPoint PPT Presentation
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Impact: RTT etc.• As sites move their routing from GEOS to terrestrial
connections, we can expect:– Dramatically reduced Round Trip Time (RTT), e.g. from 700ms to
350ms – seen immediately– Reduced losses and jitter due to higher bandwidth capacity and
reduced contention – when routes etc. stabilized• Dramatic effects seen in leading Kenyan & Ugandan hosts
325ms
Big jump Aug 1 ’09 23:00hrMedian RTT SLAC to Kenya
• Bkg color=loss Smoke=jitter
• RTT improves by factor 2.2
• Losses reduced• Thruput
~1/(RTT*sqrt(loss)) up factor 3
720ms
From ICTP, Trieste, Italy• Even Bigger effect since closer than SLAC
– Median RTT drops 780ms to 225ms, i.e. cut by 2/3rds (3.5 times improvement)
Aug 2nd
Seems to be stabilizing
Still big diurnal changes
Other countries• Angola step mid-May, more stable
• Zambia one direction reduce 720>550ms– Unstable, still
trying?• Tanzania, also
dramatic reduction in losses
• Uganda inland via Kenya, 2 step process
• Many sites still to connect
750ms 450ms
Aug 20
SLAC to Angola
SLAC to Zambia
SLAC to Tanzania
SLAC to Uganda
1 direction
Both directions
Sep 27
1 direction Both directions?
Next Steps: Going inland
• Extend coverage from landing points to capitals and major cites
• Need fibre connections inland
Central
Northern
Southern
• Connect up the rest of the sites & countries
Next Steps: Beyond Fibre’s reach• In areas where fibre connections are not available (e.g.
rural areas), the main contenders appear to be:– wireless, e.g. microwave, cellphone towers, WiMax etc., – Low Earth Orbiting Satellites (LEOS) for example
Google signed up with Liberty Global and HSBC in a bid to launch 16 LEOS satellites, to bring high-speed internet access to Africa by end 2010,