So latency to/from China is actually irrelevant here. From mtr, it turns out that I'm being served out of Germany ("alicloud-ic338528-ffm-b1.ip." Telia uses ffm to denote Frankfurt). Pinging, I get ~100ms latency from US East Coast. How much traffic to/from China is there in practice (given the Great Firewall, so it's largely unidirectional)? While that's not nothing, 30M people don't require the same scale of deployment as serving India, or the US / Canada / Mexico. Population of Australia + NZ is about 30M people. > China needs more connectivity, especially with the US for e-commerce (AliExpress is very slow). IIRC, data transiting outside of AU is relatively expensive. > Australia needs more global connectivity. For land maps I've never seen anything remotely close to being complete (no fault of the map makers, most of the data just isn't accessible). I'm pretty sure Iceland has an additional submarine path or two not accounted for here. On connectivity remember, much like South America being farther to the right, if you look on an actual globe instead of a flat projection the fastest path from China to the US is to go up to Japan not directly across the Pacific so adding connectivity there would not help.Īs with most maps this map is missing many current and upcoming cables. 1 high capacity cable may be easily worth 100 of another on this map. On bandwidth remember these lines represent cables, not the amount of bandwidth on the cable. That being said going over to Florida is the shorter path for most of the central/southern US as Central/South America is farther East than most imagine.ĪliExpress being slow is more likely a function of latency due to distance than connectivity or bandwidth. Remember this is a "submarine cable map", there are land fiber paths as well e.g. I hope nobody else has ever had to repeat such a measurement! So his instinct, that it does not matter, was incredibly correct. ![]() I believe the result was that you would see a 1% increase in the water concentration in the fiber over a period of 10,000 years. Then simple rate relations imply the rate of diffusion at sea floor conditions. ![]() How would you measure such a thing? There's no good way to increase the rate of diffusion of water into glass, but what you can do is make fiber with excess water in the core, and heat the fiber while measuring the diffusion of water out of the core into the outer portions of the fiber. (Water is an important impurity to try and control) He once was asked to calculate the rate of seawater diffusion into glass, which he and the team found ridiculous, but I suppose it was unknown if water could soak into glass in an appreciable way over long periods of time. Imagine if trans-continental communication relied on satellites? The global internet we have today would be much more isolated, with fiefdoms based on proximity.įor those interested in a fiber science story: I remember one day he brought home a $100,000 microscope that had been thrown away, which I proceeded to use to look at banal things like leaves and insects, but was designed to look at the ends of cut fibers.Īnyway, its incredible to me how much these cables have transformed the world, and how invisible it is to all of us. Our house growing up was full of cable segments, superconductors, lasers, and microscopes. ![]() My father was one of the inventors of the undersea fiber optic cable, and joined many of the cable laying missions, including the original Australia mission and several japan missions.
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