RE: Long haul latency calculation?

["Bruce Morgan" <bruce.morgan () aarnet edu au>]

Hi Chris,

On long haul and reasonable bandwidth, I figure as a rough estimate to
divide the distance in kilometers by 100 will be a very close approximation
to an RTT in ms. For instance I get 147 ms ICMP RTT on the Southern Cross
Sydney-Seattle link where the fibre path is about 14700 km. It assumes a
transmission speed close to .66 the speed of light. The calculation using
miles is a little messier ;-)

Bruce

> -----Original Message-----
> From: owner-nanog () merit edu [mailto:owner-nanog () merit edu]On Behalf Of
> Christopher Wolff
> Sent: Monday, 1 October 2001 12:09 PM
> To: nanog () merit edu
> Subject: Long haul latency calculation?
>
>
>
> 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*latencyfactor) = 5
> ms for 2900 miles?
>
> Thanks,
> Christopher