From: tnp@invalid.invalid

On 20/01/2026 13:34, Marc Haber wrote:
> The Natural Philosopher  wrote:
>> On 20/01/2026 09:46, Marc Haber wrote:
>>> but the
>>> fiber operators artificially emulate the absurdly asymmetric plans
>>> from the legacy technologies,
>> The asymmetry results from traffic analysis done in the early days of
>> 'consumer Internet'.
>
> Both DOCSIS and VDSL vectoring can't do symmetric. They rely on the
> high data rate going from the central point to the branches.
>
It's not a question of 'cant': They were *deliberately designed not to*.

And they don't 'rely' on anything other than a piece of [coaxial?] wire.

The issue is that the total bandwidth (up + down) is limited. So you
select a protocol that fits most customers usage the best.

ADSL, VDSL and DOCSIS reflect that *choice*.

Back in the day we used other serial protocols that were symmetric. Like
ISDN


> Greetings
> Marc

--
I was brought up to believe that you should never give offence if you
can avoid it; the new culture tells us you should always take offence if
you can. There are now experts in the art of taking offence, indeed
whole academic subjects, such as 'gender studies', devoted to it.

Sir Roger Scruton

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