Gem
Premium Member
join:2005-09-10 |
Gem
Premium Member
2018-Oct-2 4:38 pm
USB 3.1, 3, 2, and 1 questions1) Is there any difference between USB cables for ver. 1,2,3, and 3.1 devices?
2) Is there any difference between USB ports (the receptacles) that the cables plug into?
3) If you have a USB 3.0 or 3.1 device using any old USB cable and running on a motherboard that supports USB 3.1 if say you are using an old case that has front USB ports that was manufactured back when all we had was USB 1.0 and 2.0?
4) I am assuming that what enables USB 3.0 and 3.1 devices to run at those speeds is a chipset that supports the USB 3.0 and 3.1 speeds. Is that correct? |
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 DarkLogixTexan and Proud
Premium Member
join:2008-10-23
Baytown, TX |
3.0 and 3.1 have more pins than 2.0 or 1.1 or 1.0.
The specs are downward compatible but if the front panel is 2.0 it'll only be able to connect to the pins for 2.0. |
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to Gem
In a nutshell: 1. Yes; 1 & 2 have identical HW; 3.0 adds additional lines and connections in otherwise compatible connectors; 3.1 adds a USB Type-C connector 2. Same answer as above 3. USB 3.0 or 3.1 will usually work with 2.0 connectors, but there are a few exceptions. However, even if they work, they will usually be much slower over USB 2.0. USB 1.0 is so old that you are not likely to run into one. 4. Partly. USB 3.0/3.1 also have some additional data lines and other enhancements. See » www.techdesignforums.com ··· l-layer/ for a very short intro on the USB 3.0 PHY. |
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Gem
Premium Member
join:2005-09-10 |
to DarkLogix
Thank you. That answers the questions about the version 1 and 2 ports.  What about version 3 ports? Are they and version 3.1 ports the same thing? Also, what about USB cables. Is there any difference between version 1, 1.1, 2.0, 3.0, and 3.1 cables? What about power to devices over USB? Do version 3 and 3.1 ports and cables provide more power to a USB device than those for 1.0, 1.1, and 2.0? |
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Roadkill
Premium Member
join:2008-06-17
united state |
Roadkill
Premium Member
2018-Oct-3 7:56 am
Hello Gem, DarkLogix and nocturnal answered your question about connectors which also answers the cables question. A 3.1 connector means it is a 3.1 cable, etc. Have a look at this article: » techprompts.com/usb-vers ··· 3-0-3-1/A quick typed question on duck duck go gave several results. |
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Gem
Premium Member
join:2005-09-10 |
Gem
Premium Member
2018-Oct-3 8:17 am
Okay, so is it correct to say that what we call USB 3.1 today is indeed nothing more than USB 3.0 and that only USB 3.2 is actually faster than USB 3.0?
Also, how can well tell - visually - if a given USB cable is indeed a ver. 3 cable as opposed to ver. 1 or 2? |
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Roadkill
Premium Member
join:2008-06-17
united state |
Roadkill
Premium Member
2018-Oct-3 8:56 am
said by Gem:Okay, so is it correct to say that what we call USB 3.1 today is indeed nothing more than USB 3.0 and that only USB 3.2 is actually faster than USB 3.0?
Also, how can well tell - visually - if a given USB cable is indeed a ver. 3 cable as opposed to ver. 1 or 2? USB 3.0 supports data speed specs of 5 gigabytes per second. USB 3.1 supports data speed specs of 10 gigabytes per second. My newest computer case labels the USB ports on the front. On the back of the computer; newer ports sometimes have colors. I find labels on the back I/O shield. I believe 3.0 and up can charge at 100 watts which is enough for a laptop. Here is a link that might help you: » www.avadirect.com/blog/u ··· ference/I hope this helps you figure things. EDIT: I forgot to type they have different pictures, err icons for the different plugs. |
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DarkLogixTexan and Proud
Premium Member
join:2008-10-23
Baytown, TX |
said by Roadkill:USB 3.0 supports data speed specs of 4.8 gigaBITS per second. FTFY Also said by Roadkill:USB 3.1 supports data speed specs of 10 gigaBITS per second. |
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to Gem
Okay, so is it correct to say that what we call USB 3.1 today is indeed nothing more than USB 3.0 and that only USB 3.2 is actually faster than USB 3.0? No for both. Read » en.wikipedia.org/wiki/US ··· #USB_3.xAlso, how can well tell - visually - if a given USB cable is indeed a ver. 3 cable as opposed to ver. 1 or 2? ? Read » en.wikipedia.org/wiki/US ··· nnectors |
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| nocturnal |
to Roadkill
I believe 3.0 and up can charge at 100 watts which is enough for a laptop. I think the 20V 5A charging mode is added with USB 3.1 and the Type-C connector, although according to the power delivery spec, high voltage modes were available before as per: » en.wikipedia.org/wiki/US ··· l)#PowerI think in practice they were only available with charger ports before USB 3.1. |
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DarkLogixTexan and Proud
Premium Member
join:2008-10-23
Baytown, TX |
said by nocturnal:I think in practice they were only available with charger ports before USB 3.1. Though per the spec when the port does more than 5v it's only power and is not supposed to still be doing data. |
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Roadkill
Premium Member
join:2008-06-17
united state |
to nocturnal
The reference articles I listed have the details outside of my own summary. |
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to DarkLogix
Though per the spec when the port does more than 5v it's only power and is not supposed to still be doing data. Can you paste the actual quote? I believe with 3.1 or later, data is available even at higher voltages, though I could be wrong on that. |
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Gem
Premium Member
join:2005-09-10 |
Gem
Premium Member
2018-Oct-3 4:01 pm
See what Kingston seemed to say about it in a marketing page. » www.kingston.com/us/usb/usb_30 |
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DarkLogixTexan and Proud
Premium Member
join:2008-10-23
Baytown, TX |
The renaming thing is some BS that the USB standards group pulled. I don't know anyone that goes by it. |
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to Gem
What are you referring to? That page has quite a bit of stuff, but didn't see much related to power delivery. But here is a relevant link: » www.snapnator.com/blog/w ··· b-type-c |
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Gem
Premium Member
join:2005-09-10 |
Gem
Premium Member
2018-Oct-3 9:23 pm
My reference wasn't to power delivery, but to the fact that they seemed to be equating USB 3.0 and 3.1 being the same thing. That was part of what I was wondering in the original post even though not stating that outright. I do understand that USB 3.2 is indeed different than 3.1 and that it takes a different cable to a different sized port and that it runs at a higher speed and that perhaps it requires a bit more power. You guys have cleared that up for me.  |
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USB 3.0 and 3.1 are obviously not the same thing, but in usual scenarios, you are not likely to see any difference right now. 3.1 is twice as fast as 3.0, but the only common devices with a higher data rate than USB 3.0 are SSDs, so the higher DTR won't make much of a difference at this point in time. As far as I concern the biggest addition is the much more enhanced power delivery (100W) , but not very many devices take full advantage of the 20V supply just yet. Here is a link that explains these issues with more details: » www.velocitymicro.com/bl ··· ference/ |
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