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Author Topic: Investigating the upper bound of high-frequency electromagnetic waves  (Read 316 times)

meritez

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https://www.nature.com/articles/s41467-022-29631-8

Quote
We believe that the DSL technologies can further boost the achievable rates beyond 10Gbps by utilising carrier frequencies higher than 1 GHz. In this way, the existing copper infrastructure can be further used to satisfy the data rates required for the future communication networks without any need of replacing all of the copper infrastructure

Off to read.
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Alex Atkin UK

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Re: Investigating the upper bound of high-frequency electromagnetic waves
« Reply #1 on: April 29, 2022, 01:25:19 AM »

Oh come on, even in an MDU this surely wouldn't stretch far enough.

We've already seen how g.FAST is pretty much pointless, why are they wasting time on this?
I don't see how putting a DSLAM six inches away from the socket is going to be more practical than taking the fibre all the way.

This going to give Max nightmares. ;)

When the biggest problem to fibre is trying to reach remote places, pushing more over shorter copper is exactly the opposite of a solution.
« Last Edit: April 29, 2022, 01:32:32 AM by Alex Atkin UK »
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Weaver

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Re: Investigating the upper bound of high-frequency electromagnetic waves
« Reply #2 on: April 29, 2022, 10:15:23 AM »

Since the twist needs to be shortened to get higher speeds, that defeats the object; if you have to replace the tp with better tp that has shorter twists, then you might as well install fibre instead. And the fibre would be faster, more future proof and more reliable in two respects: no distance-dependant performance and interference-proof. A paper on the interference vulnerability of tp at these crazy frequencies be very interesting.

Still, the performance that can be had without shortening the twists is fairly mind-blowing, even though it is only over G.Fast-type lengths.
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Alex Atkin UK

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Re: Investigating the upper bound of high-frequency electromagnetic waves
« Reply #3 on: April 29, 2022, 06:17:17 PM »

Exactly what I was thinking Weaver, it makes no sense at all as replacing the copper would surely cost more than replacing with fibre.

I never doubted we could squeeze more out of copper, but surely the best way to do that would involve removing all older DSL tech and use the entire frequency range available of the copper alongside vectoring?  Pushing higher and higher range-limited frequencies makes no sense, especially with some lines being aluminium.
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burakkucat

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Re: Investigating the upper bound of high-frequency electromagnetic waves
« Reply #4 on: April 29, 2022, 06:27:45 PM »

Pushing higher and higher range-limited frequencies makes no sense, especially with some lines being aluminium.

Are you thinking "skin effect" along with the fact that aluminium is a reactive metal, which is rapidly passivated in the atmosphere, by the formation of a surface layer of its oxide? (Elemental aluminium plus oxygen plus water vapour ---> Al2O3)
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