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Custom USB 7 port hub PCB dasiy-chain

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StealthRT

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Hey all I had a schematic laid out for a custom USB 2.0 7 port hub I needed to create for a project of mine. It currently uses Ethernet RJ45 sockets to provide power and data to each hub (2 Ethernet ports for upstream and downstream USB) along with the needed resisters/regulators (to drop it down to 5vdc/3.3vdc)/etc.

Though I have an issue and that's why I wanted to post on this forum and see if it can be taken care of before I send the Eagle & gerber files to the company to get printed and populated.

The usb hub chip I am using is the microchip USB2517 [https://www.microchip.com/wwwproducts/Devices.aspx?product=USB2517]. And the datasheet is here [ https://ww1.microchip.com/downloads/en/DeviceDoc/2517.pdf ].

Would it be possible, running a power supply of 12vdc 160W 10a [ https://www.12vadapters.com/adapter/power-supply/12v/10-amp-10a.html ], to power the hubs? Keep in mind not all of the 6 USB ports will be used per the 12 or so hubs I will have daisy chained. I would guess that 18 to 35 usb ports out of a possible 72 usb ports will be used. If it's not possible then what would need to be in place for that to happen?
 
You want to power 35 USB ports at one time, I think.
You need 5 volts for the USB ports.
A switching power supply will take 12V at 10A and make 5V at 20A. That's 570mA per USB.
 
The ethernet cable is not the same cable as used in USB; you may have some issues with longer cables.
Rated current through a single CAT5 cable conductor is < .577A (ref https://en.wikipedia.org/wiki/Category_5_cable), which would therefore be unsuitable to pass the low voltage to the downstream hubs, especially if you are using an actual daisy-chain configuration (star would be better in this regard).
 
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