60 ms cross-continent
Joe Greco
jgreco at ns.sol.net
Sat Jun 20 16:29:37 UTC 2020
On Sat, Jun 20, 2020 at 09:24:11AM -0700, William Herrin wrote:
> Howdy,
>
> Why is latency between the east and west coasts so bad? Speed of light
> accounts for about 15ms each direction for a 30ms round trip. Where
> does the other 30ms come from and why haven't we gotten rid of it?
>
> c = 186,282 miles/second
> 2742 miles from Seattle to Washington DC mainly driving I-90
>
> 2742/186282 ~= 0.015 seconds
Speed of light in a fiber is more like 124K miles per second. It
depends on the refractive index. And of course amplifiers and stuff.
... JG
--
Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net
"The strain of anti-intellectualism has been a constant thread winding its way
through our political and cultural life, nurtured by the false notion that
democracy means that 'my ignorance is just as good as your knowledge.'"-Asimov
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