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