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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: NY ranks #1 in Internet b/w
On Sun, 4 Nov 2001, Alex Rubenstein wrote: > That sounds somewhat erroneous. Geosynchronus orbit is about 22,500 miles; > up+down+roundtrip makes that 22,500 * 4, or 90,000 miles; > 90,000 / 186,000 miles/sec = 483 milliseconds, which, or course, due to > routers inducing very measureable delay, and the fact that an IP Packet > takes adds a little delay due to its lenght, is usually a bit more. Practically, I know back in 1994 when I was in the US and the Nordic university network had a backup E3 satellite link I had to use, the round trip times were approx 600ms. 483ms round trip if you're at the equator, sounds like it can correlate fairly well to 600ms when you have to go from northern europe, to a satellite hanging up above the atlantic ocean, and then down to north america (or might even be so satellite over africa, then to satellite hanging over central america, then down to north america, ie two satellite hops). -- Mikael Abrahamsson email: [email protected]
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