{"id":3439,"date":"2022-02-13T18:51:01","date_gmt":"2022-02-14T02:51:01","guid":{"rendered":"https:\/\/wonghoi.humgar.com\/blog\/?p=3439"},"modified":"2022-02-13T18:54:23","modified_gmt":"2022-02-14T02:54:23","slug":"are-powered-usb-hub-bus-powered","status":"publish","type":"post","link":"https:\/\/wonghoi.humgar.com\/blog\/2022\/02\/13\/are-powered-usb-hub-bus-powered\/","title":{"rendered":"Are powered USB hub bus-powered?"},"content":{"rendered":"\n

I’ve bought many powered USB hubs, even the expensive industrial version like Startech, but they never work reliably when I connect multiple devices that draws quite a bit of power. The behavior is the same (erratic when too many power drawing devices are active within one hub) whether I supply the hub with external power or not.<\/p>\n\n\n\n

I suspected the USB hubs wasn’t wired in a way that the USB hub controller understands that I want to have the hub self-powered (powered from an external source like a wall wart instead of drawing the 5V from the USB upstream cable). So I opened up my StarTech and it looked like this:<\/p>\n\n\n\n

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Love that it’s made in Taiwan and they cut no corners in power management.
10 ports means 3 x 4-port hub chained and they do not share power converters.<\/figcaption><\/figure>\n\n\n\n

On the top left corner, there’s a jumper to set the USB hub to use self-powered instead of bus-powered (default out of the box). I switched the jumpers and the board no longer takes power from the upstream bus and the lights won’t light up until I have the local power connected, which confirms it’s working as a self-powered hub.<\/p>\n

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I’ve bought many powered USB hubs, even the expensive industrial version like Startech, but they never work reliably when I connect multiple devices that draws quite a bit of power. The behavior is the same (erratic when too many power … Continue reading →<\/span><\/a><\/p>\n

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