The speed of light through fiber is about 2/3 the speed of light through a vacuum. This is why HFT prefers microwave over fiber when it comes to latency.

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Mike Hammett
Intelligent Computing Solutions

Midwest Internet Exchange

The Brothers WISP

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From: "Ben Cannon" <ben@6by7.net>
To: "Mehmet Akcin" <mehmet@akcin.net>
Cc: "nanog" <nanog@nanog.org>
Sent: Tuesday, October 30, 2018 2:59:48 AM
Subject: Re: CLS to CLS Latency info

I’d be astonished if they varied much from lightspeed. 

-Ben

On Oct 29, 2018, at 8:11 PM, Mehmet Akcin <mehmet@akcin.net> wrote:

Hello there

I have been searching for CLS (Cable Landing Station) to CLS latency infirnation for submarine cables. I was able to identify only a handful of them via sales catalogs. I am still missing like 320~ systems, does wnyone have this info available?

If i can’t find the data, i am going to formulate from lentgh of fiber diveded by speed of light on fibre (~ +\- resistance) but I really would prefer actual ping ;)

This is for www.networkatlas.org project. Thank you in advance!

Mehmet

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Mehmet
+1-424-298-1903