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Usbc.wtf – an article and quiz to find the right USB-C cable

usbc.wtf

111–120 of 125 posts

Re: Usbc.wtf – an article and quiz to find the right USB-C cable

#111
post #51

There are no fast charging USB C to A cables?

Define "fast charging".

The best you can get via USB BC1.2 is 1.5A at 5V. This doesn't rely on anything special in the cable aside of requiring it to be able to carry USB 1.0/2.0 data, since it's signaled over D-/D+ pins.

You can get more than that, but then you're entering a proprietary mess territory where all bets are off.

Re: Usbc.wtf – an article and quiz to find the right USB-C cable

#113
post #38

Neat site. One more angle I didn't think about until recently was buying a USB-C cable that was magnetic/breakaway to minimize port wear on a laptop that only has one usb c/thunderbolt. I spend a bit of time around quizzing and surveying, that brain enjoyed this quiz and the following ideas popped to mind. - Like the big font. Could be even a bit bigger. Playing with centering could help draw attention down a bit eas…

> Neat site. One more angle I didn't think about until recently was buying a USB-C cable that was magnetic/breakaway to minimize port wear on a laptop that only has one usb c/thunderbolt. This is a horrific idea if you care about your devices; they can detach and become misaligned, applying Vbus to pins that are definitely not capable of handling 20 V.

Interesting. Just keeping an extra macbook for longer

Maybe there’s a MagSafe to Thunderbolt adapter that is a bit safer. Seems reasonable enough

https://elecjet.com/products/magthunder-x-magnetic-thunderbo...

In terms of caring about my devices it’s the other way around. While I’m gentle, Apple stopped caring about longevity for the latest and most thinnest. Maybe the current gen will finally outdo the peak of 2014 MBP.

After a number of laptops, it starts to feel like you’re buying another premature death of a new laptop instead of a new laptop.

Have hopes for the new series. Maybe in a year or two.

Edit: clarity, link

Re: Usbc.wtf – an article and quiz to find the right USB-C cable

#114
post #32

Have to point a couple things out I found. The USB versioning table needs some corrections: - USB 3.1 Gen 2 is the same as USB 3.2 Gen 2 and is only found at 10Gbps. - The 40Gbps entry is wrong, the real spec name is USB4 Gen 3x2. But it was never really advertised as such so I'd leave that out. - 20Gbps is either USB 3.2 Gen 2x2 or USB4 Gen3x1, but I'd caution against adding this as the latter is quite rare to see (…

> 20Gbps is either USB 3.2 Gen 2x2 or USB4 Gen3x1, but I'd caution against adding this as the latter is quite rare to see (plus the above reason). Did you confuse the latter with the former perhaps? I have never seen USB 3.2 Gen 2x2 in the wild. I have just bought a 20 Gbps USB4 cable, connected my laptop with my Android phone using it and it works lightning fast (as compared to USB 3.2 gen 1).

Here's a Gen 2x2 SSD [1] but I can't seem to find a reliable listing for a cable, the general consensus is just to use what comes in the box. At this point I'd only buy cables that come with the right logo stamped directly on it like this one [2].

[1] https://www.amazon.com/dp/B08GV4YYV7

[2] https://www.amazon.com/dp/B09YM3V7NX

Re: Usbc.wtf – an article and quiz to find the right USB-C cable

#115

So the table lists "USB 40Gbps" as supporting an 8k display at 60hz, then "Thunderbolt 3" is listed as supporting that transfer speed, but not an 8k display at 60 hz? Which is it?

Maybe someone who understands the specs better can add more information, but as far as I can tell from Wikipedia, USB4 supports DP in two different ways: tunneling and alternate mode. When tunneling, you are limited to DP 1.4a and wouldn't be able to do 8k/60Hz without compression (which is also optional, I believe). In alternate mode, which essentially runs DP over the USB cable without wrapping the protocol, you ca…

That seems about right.

> which is also optional, I believe

Compression support (DSC) is mandatory since DP 2.0. So running DisplayPort Alt Mode 2.0 (which is basically "DP 2.0 over USB-C") should guarantee DSC support. The new USB4 Version 2 also bumps tunneled Displayport to the latest DisplayPort 2.1 spec. Then you can tunnel up-to 80 GBit/s as well (without using alt-mode).

Thunderbolt 3 is a funny protocol, because in reality only Intel made PHYs for it, so the DP version is bound to whatever Intel controller you've got. The 6000 series controllers have DP 1.2, the 7000 series has DP 1.4 and DSC.

Re: Usbc.wtf – an article and quiz to find the right USB-C cable

#116
post #108

Recommending a 3ft thunderbolt 4 cable for charging my phone in bed isn't ideal. Length and thickness/flexibility of cable are also very important although the latter is harder to quantify.

I disagree. This page is about the technical capabilities of the cable. 3ft vs 6ft is something you pick when adding the cable to your Amazon cart or whatever.

The recommended thunderbolt cable has no such selection.

Re: Usbc.wtf – an article and quiz to find the right USB-C cable

#117

Earlier quoted context omitted.

Do you have a link to one of them? I am having trouble finding anything that looks like this.

https://aliexpress.com/item/1005002835878171.html

That's not the same thing at all. That measures power flowing through a USB cable, which is still useful, but doesn't tell you anything about the capabilities of the cable.

Re: Usbc.wtf – an article and quiz to find the right USB-C cable

#118

Is it a trade-off on capability or just cost? That is, is there an expensive cable that does it all perfectly?

I'm going to add: Length. Six foot USB-C cables with USB 2.0 are cheap and easy to find. More than three foot for a 40Gbit/s USB4 cable requires active components which are expensive and usually not future-proof.

Re: Usbc.wtf – an article and quiz to find the right USB-C cable

#119
post #64
post #52

Earlier quoted context omitted.

Sure, for a tech employee it may be heavy handed. However I could definitely see my older parents finding this quite helpful for them.

Your old parents will just use the cable they got with the monitor / dock / phone and be fine. These contortions and hand wringing is pretty much a property of overthinking neck beards.

I don't think either a new laptop or a new monitor comes with a Thunderbolt 3 cable. Your parents will have to purchase that separately.
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