North American Network Operators Group
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Re: Long haul latency calculation?

  • From: Steven M. Bellovin
  • Date: Sun Sep 30 22:30:49 2001 
In message <[email protected]>, "Christopher Wolff" wri
tes:
>
>Dear Nanog:
>
>I was wondering if there is a benchmark for long-haul circuit latency...  For 
>example if I had a T1 circuit with 2900 miles between the two end-points (and 
>assuming the provider is best case scenario) can I do something like (miles*la
>tencyfactor) = 5 ms for 2900 miles?

It's called "speed of light lag"...  If I recall correctly,
the speed of light in fiber is about .65c, where c is the speed of 
light in a vacuum (300,000 km/sec).

		--Steve Bellovin, http://www.research.att.com/~smb
				  http://www.wilyhacker.com