Long haul latency calculation?

Mon Oct 1 02:26:01 UTC 2001

In message <200109301909.AA29032658 at mail.turbonet.net>, "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