Network Latencies and Speed of Light
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Network Latencies and Speed of Light
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Re: Network Latencies and Speed of Light
#2Seems like directional radio/laser-in-tube would get you back that 1/3 by avoiding the internal reflection problem altogether.
Re: Network Latencies and Speed of Light
#3Seems like directional radio/laser-in-tube would get you back that 1/3 by avoiding the internal reflection problem altogether.
That's why companies doing HFT or stock exchanges often use microwave links... Just to crank it to eleven err to gain that 30% back.
Information Transmission Between Financial Markets in Chicago and New York: https://arxiv.org/pdf/1302.5966v1.pdf
Time is money when it comes to microwaves: https://www.ft.com/content/2bf37898-b775-11e2-841e-00144feab...
Trading Fortunes Depend on a Mysterious Antenna in an Empty Field: https://www.bloomberg.com/news/articles/2017-05-12/mysteriou...
https://arstechnica.com/information-technology/2016/11/priva...
Re: Network Latencies and Speed of Light
#4Well, we already have tech that can provide us with virtually lowest latency physically possible without having to dig any tunnels - high frequency radio waves :)
Of course bandwidth could be a problem but for pings it should be enough.
Re: Network Latencies and Speed of Light
#5Serious question: for a transatlantic network, would it ever make sense to do something along the lines of buoy + helium balloons + laser or microwave? Or in a similar vain, would it make sense to attach microwave 'towers' to shipping vessels?
I could see something like that work really well for the HFT world, where some clever hacks could make use of an unstable, but extremely low latency connections.
Re: Network Latencies and Speed of Light
#6Here's some academic work that goes into much more detail about this topic: https://arxiv.org/abs/1505.03449
Re: Network Latencies and Speed of Light
#7Obligatory link to "The case of the 500-mile email":
Re: Network Latencies and Speed of Light
#8There's another key issue: peering. Minimum rtt between nearby ISPs can be huge, when nearest shared peer is a few hundred km away. That's so for parts of Hong Kong vs mainland China. Also Salt Lake City and Zurich.
Re: Network Latencies and Speed of Light
#9Money is no object to HFT firms when it comes to reducing latency. A recent technique involves laying optic fiber cables with hollow interiors, so that the internal refraction of light spends more time in a vacuum and less time slowed down by the pesky glass medium.
Re: Network Latencies and Speed of Light
#10What about all the hops your signal has to take to make the round trip? Couldn’t those be optimized or sped up? Is copper latency really equivalent to fiber?