Re: Long haul latency calculation?

["Steven M. Bellovin" <smb () research att com>]

In message <200109301909.AA29032658 () 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