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USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

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Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#181
post #162

Earlier quoted context omitted.

USB-C can send significantly more power, which makes it harder to protect devices in these cases.

It only happens after negotiation, so the higher potential wattage plays no role here. You'd need both a bad cable and an out-of-spec wall wart.

The failure can happen after negotiation, right?

Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#182

Earlier quoted context omitted.

It only happens after negotiation, so the higher potential wattage plays no role here. You'd need both a bad cable and an out-of-spec wall wart.

The failure can happen after negotiation, right?

Yeah that's true, the cable could bend and cause a short after the negotiation, but how is a specification supposed to protect against this?

Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#183

Earlier quoted context omitted.

It only happens after negotiation, so the higher potential wattage plays no role here. You'd need both a bad cable and an out-of-spec wall wart.

The failure can happen after negotiation, right?

Many reference design have a USB power surge protection circuit.

Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#184

Earlier quoted context omitted.

It only happens after negotiation, so the higher potential wattage plays no role here. You'd need both a bad cable and an out-of-spec wall wart.

Do you think that combination of circumstances is rare enough that we shouldn't wonder about it?

More or less.

Either scenario, considered alone, is enough to ruin a downstream device. I don't think it's reasonable to worry about the combination of the two as different from either alone.

Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#185

Earlier quoted context omitted.

So remind me, why can you walk into any apple store, pick up a new MacBook and a 5K LG monitor, and when you plug in the monitor using the USB-C cable that was bundled with the MacBook it just won't work at all? My point is - the standards might be back and forward compatible. But the cables and ports definitely aren't - and your average consumer has absolutely no way of knowing. They look absolutely identical on the…

The cables should have a ss or ss 10 or ss 20 label on them. The end devices should too I believe.

"should"

The USB logo on usb1.0 cable should be printed on the "upper" side. How many times did you inserted it the wrong way?

Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#186
post #108

Earlier quoted context omitted.

Intel said that a couple of years ago, and yet you won't find an AMD laptop/desktop that supports thunderbolt.

One, what AMD laptop? Two, I'd be interested to know if AMD bans board manufacturers from including TB or if they just don't do it because their heuristics say users don't care or want it. I'd imagine now with the rise of USB-C it would be the latter. Before that AMD was stuck on a 5 year old desktop platform that probably couldn't run thunderbolt ports even if board makers wanted to include it.

>Two, I'd be interested to know if AMD bans board manufacturers from including TB or if they just don't do it because their heuristics say users don't care or want it

No, AMD boards already include the required TB hardware. They just can't enable it (yet) for whatever technical or legal reasons. Someone hacked them to enable it (https://www.youtube.com/watch?v=uOlQbP63lDQ)

Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#187
post #88

I'd be curious about 40Gbps for what cable length. TB3 is great, you can in theory dock a laptop with a single cable that will do charging, 10gbe, USB hub, etc, but with a max 50cm cable, which makes it quite "un-lappable". I'd love to do the same with a 2m cable.

I have a 2m TB3 cable that I bought off amazon [0] a year ago. Some of the reviewers reporting having trouble but it has worked like a charm for me.

[0] https://smile.amazon.com/gp/product/B01H5QF2TK

Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#188
post #84

Earlier quoted context omitted.

Is it fast enough for 4K120 or 8k displays?

Do we need 8K displays at all? https://www.youtube.com/watch?v=ehvz3iN8pp4 https://www.youtube.com/watch?v=VxNBiAV4UnM

My favorite monitor is my 42.5" Dell ultrasharp. The screen real estate is amazing, but it has old school 100% scaling. I would absolutely love the same panel dimensions with twice the number of pixels.

Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#189
post #156

Earlier quoted context omitted.

Now, if only someone would actually ship a USB-C 3.2 (or Thunderbolt) active cable. :( I have a couple of situations I would like a 7m-ish Thunderbolt 3 cable but can’t seem to find one, even for the multiple-hundreds it would probably cost.

Corning has several lengths of optical thunderbolt 2 cable, do you need it to be thunderbolt 3 specifically?

This is for 5K and docking station specifically.

Re: USB4 Specification Announced: Adopting Thunderbolt 3 Protocol for 40 Gbps USB

#190
post #86

Earlier quoted context omitted.

I feel like hand-wringing around that is a bit overexaggerated - at the end of the day the differences really matter for only really tiny subset of devices that need those 10GBit+ transfers and in that case you can guide yourself by the "SuperSpeed 10Gbit" "Superspeed 20Gbit" logos on the actual box. For everything else the protocols are forward and backward compatible, so you just plug in the cable and it works.

So remind me, why can you walk into any apple store, pick up a new MacBook and a 5K LG monitor, and when you plug in the monitor using the USB-C cable that was bundled with the MacBook it just won't work at all? My point is - the standards might be back and forward compatible. But the cables and ports definitely aren't - and your average consumer has absolutely no way of knowing. They look absolutely identical on the…

A lot (most?) charge cables are USB 2.0 — just enough data to negotiate the higher power. If they supported faster data too, they'd be more expensive. But it definitely should be more clear! Apple's minimalism doesn't help in this case, either.
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