this post was submitted on 26 Dec 2024
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There is a reason for USB-C extensions not to be part of the standard. They can be bothersome in the best case and dangerous in the worst.

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[–] [email protected] 334 points 2 weeks ago (7 children)

If you want a more detailed explanation, USB-C is a small connector that was designed primarily for data transfer, extended power range delivery (240w) was essentially hacked on to the standard. Electricity arcing between the contacts on the connector is the biggest challenge with this hack, since the contacts are small and very close together, which could burn out the circuit board and start fires. For EPR to work safely, there needs to be a lot of extra components on the circuit board/female connector side, which there simply isn't enough space for on an f2m extension cable.

As for why USB-C cables are so short, it's simply a matter of physics, carrying high speed data over larger distances would result in higher losses and requires thicker conductors and more shielding, which is why you don't see USB4 Gen3 cables over 1 meter unless they are optical, and longer "charging cables" are only rated at USB 2.0 speeds, because more often than not they don't even have the USB 3.x data pins on their connector.

[–] [email protected] 100 points 2 weeks ago (1 children)

You are a brilliant woman of many talents, Margot Robbie!

[–] [email protected] 94 points 2 weeks ago (1 children)

That's esteemed Academy Award nominated character actress Margot Robbie to you!

Also, thank you.

[–] [email protected] 2 points 1 week ago (1 children)
[–] [email protected] 2 points 1 week ago

I would say more like a Harley Quinn.

[–] [email protected] 18 points 2 weeks ago (2 children)

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).

[–] [email protected] 29 points 2 weeks ago (1 children)

You're right. Those are active cables which I forgot to mention earlier that have special circuits that amplify signals, but are also a lot more expensive as a result.

[–] [email protected] 14 points 2 weeks ago (2 children)

$90 for a cable and it’s not even braided is wild to me.

[–] [email protected] 6 points 1 week ago

I prefer not braided. Both for cables and hair. More of a ponytail kinda guy myself.

[–] [email protected] 3 points 1 week ago (2 children)

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.

[–] [email protected] 1 points 1 week ago

Braided cables are just higher quality imo because they can’t tangle easily and take a lot of effort to bend.

[–] [email protected] 1 points 1 week ago

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.

[–] [email protected] 17 points 2 weeks ago (1 children)

I don't seem to be able to upvote this twice.

[–] [email protected] 46 points 2 weeks ago (1 children)

You could always buy more copies of "Barbie" on Blu-ray for Christmas.

Just saying.

[–] [email protected] 7 points 2 weeks ago

Absolute gold 🤣

[–] inriconus 11 points 1 week ago* (last edited 1 week ago)

It's amazing for a "standard" that there can be so many non-standard ways to do it. Your explanation is great and just reminded me that cable tester tools are a really good idea to have at home. There was one in Kickstarter earlier this year, I think, that was a really smart idea. I don't recall what it was nqmed though. Maybe you have heard of it? I'll see if I can find it.

Regardless, there are some devices that really need a specific type of usb-c cable to function properly and/or not burn the circuitry. (i.e. Nintendo Switch, the original release model (though, they may have fixed it in later hardware revisions))

Edit: Found it! That cable tester that I was referring to was called the BLE CaberQU. I think it is a really neat idea.

[–] [email protected] 8 points 1 week ago

I'm glad someone is smart cause I sure ain't

[–] h54 5 points 1 week ago

Nice explanation, thanks!