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CircleTech

USB hub daisy chain

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Posted · Original PosterOP

So this is kind of stupid, but LTTs entire channel is about doing stupid stuff soooo...

 

A few months ago Linus tested how many PCIe extensions can you use before the video card just sort of stops working. But what if you did this with USB devices?

 

you see according to The USB specification, up to 127 devices can be used on one port assuming you daisy chain enough USB hubs to connect all those devices to a single USB port. What if linus got 32 4 port USB hubs (some would have to be powered) (enough to have 127 ports accessible after daisy chaining all the USB hubs) and plugged 127 USB devices into them into them to test the real limits of USB?

 

Will this ever happen? Probably not. But that would sure be a cool video.

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@LinusTech????

(@LMG Ivan and @Slick for good measure)


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Posted · Original PosterOP
2 minutes ago, JDE said:

@LinusTech????

(@LMG Ivan and @Slick for good measure)

@CPotter

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Posted · Original PosterOP

 

Okay so he would have to buy 22 of these 7 port generic powered USB hubs for $264:

https://www.newegg.com/Product/Product.aspx?Item=9SIA7253MP0320&cm_re=USB_3.0_hub-_-0J2-002D-00118-_-Product

 

about 150 64MB USB thunb drives for $284:

https://www.newegg.com/Product/Product.aspx?Item=9SIA7253MP0320&cm_re=USB_3.0_hub-_-0J2-002D-00118-_-Product

 

To pull this off with absolutely no sponsorship it would cost about $550. They've definitely done waaaay more expensive projects. And in all likelihood they would get sponsorships for most of the parts because USB hubs are super common and don't cost much for a manufacturer to make. 

 

@JDE

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I've daisy chained 2 USB Hubs before and it works well so long as you don't need USB for seriously fast I/O .


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Posted · Original PosterOP
3 hours ago, Pangea2017 said:

@CUDA_Cores please no cheap powered USB hub for calculation these things can kill your PC (sending power back to the USB host)

They can use any old $30 motherboard to do it. If the mobo blows up it was $30.

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Since I had to look it up, might as well post it as well.

 

He would run into the actual limitations of usb, I found this out the hard way.  127 devices is a lie.

https://acroname.com/blog/why-cant-i-connect-more-usb-30-devices-my-system

https://www.yoctopuce.com/EN/article/how-many-usb-devices-can-you-connect

 

Adding additional root hub controllers using pci-e cards work, the cheap ones only have a single controller chip, meaning the 4+ ports on the back are a lie, its just the first hub.

Multiple controllers are costly

https://www.bhphotovideo.com/c/product/1190384-REG/highpoint_ru1144d_rocketu_1144d_four_usb.html

I think the newer ones only require 2 chips rather than 4.

 

bench

https://www.youtube.com/watch?v=L_syZD8Gou8

 

 

 

On 1/12/2018 at 10:21 PM, Pangea2017 said:

@CUDA_Cores please no cheap powered USB hub for calculation these things can kill your PC (sending power back to the USB host)


Yep, I found this out the hard way as well, my pc wouldn't boot when I finally fully powered it down instead of resetting, trouble shooting ensued, couldn't figure it out, even tried to swap in a spare psu.  Finally noticed the motherboard led was still on, would only go off if I unplugged all the usb, the hub was backfeeding power into the system, luckily it was ok, just stopped it from starting.  You can test this easily by plugging the powered hub into another hub with switches and indicators on each port, the port will light up even if it is "off" because its being back fed power. My decent wavlink hubs don't backfeed, my orico/sabrent cheapies all do.

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