nanog mailing list archives
Re: 60 ms cross-continent
From: Joe Greco <jgreco () ns sol net>
Date: Sat, 20 Jun 2020 11:29:37 -0500
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
Current thread:
- 60 ms cross-continent William Herrin (Jun 20)
- Re: 60 ms cross-continent Joe Greco (Jun 20)
- Re: 60 ms cross-continent Tim Požár (Jun 20)
- Re: 60 ms cross-continent Tim Durack (Jun 20)
- Re: 60 ms cross-continent Tim Durack (Jun 20)
- Re: 60 ms cross-continent Dave Cohen (Jun 20)
- Re: 60 ms cross-continent Mel Beckman (Jun 20)
- Re: 60 ms cross-continent Wayne Bouchard (Jun 20)
- Re: 60 ms cross-continent Saku Ytti (Jun 20)
- Re: 60 ms cross-continent Bryan Fields (Jun 20)
- Re: 60 ms cross-continent Martin Hannigan (Jun 20)
- Re: 60 ms cross-continent Saku Ytti (Jun 20)
- Re: 60 ms cross-continent Tim Durack (Jun 20)
- Re: 60 ms cross-continent Joe Greco (Jun 20)