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I never knew that USB-C extensions are not allowed for a reason
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this post was submitted on 26 Dec 2024
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I have this cable: https://www.spigen.com/products/arcwire-usb-c-to-usb-c-cable-pb2202
It's 2 meters long, 240 watts and supports Thunderbolt 4/USB 4 (40 gbps).
I couldn't test the 240 watts charging as I don't have any device pulling more than 100 watts, but the Thunderbolt 4 part definitely works.
Apple sells a 3 meter Thunderbolt 4 cable (albeit limited to 100 watts of power) that isn't optical either (I think there's some special circuitry in the plugs though).
$90 for a cable and it’s not even braided is wild to me.
Braiding doesn't really increase the cable quality per se though..?
It's $90 because it has fairly thick wiring and as Margot said is likely an active cable (with a chip in the plug). It's actually fairly cheap considering the feature set.
A shielded braid reduce the noise on the data lines and gives a better signal integrity. So it doesn't increase the quality of the material, but increase the signal to noise ratio (SNR), which is very important for data transmission.