@argv_minus_one @fivetonsflax @futurebird *Puts hand up*

Hi, I have worked in the ISP space before.

Cable's asymmetry wasn't an intentional choice. But a design vestige of its history. Originally these systems were designed as a one-to-many (and one way) network. Radio waves were blasted down the wire and into the back of TV sets

The lacking upload speed is because the networks were never *designed* with the idea of broadcasts coming back up the pipe. DOCSIS was grafted on to cable TV networks as an afterthought and required major cleanup of the design of the networks to accommodate them

Jul 2, 2026, 05:57 UTCen

Replying to @CursedSilicon@social.treehouse.systems

@CursedSilicon @argv_minus_one @fivetonsflax @futurebird
It was asymmetric because they want to partition the frequency spectrum used into separate upward and downward bands, to avoid the computationally heavy need for full echo cancellation, and they both expected and wanted end users to be mostly consumers of content, not producers.
There was no _techincal_ reason it couldn't be reverse in the other direction, or fully symmetric (which existed: SDSL).
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