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RE: Long haul latency calculation?
From: "Bruce Morgan" <bruce.morgan () aarnet edu au>
Date: Mon, 1 Oct 2001 12:38:25 +1000


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



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