olemus
seadis USB-pesa paljundamiseks
= a device extending a single USB port into several

ülevaateid
https://www.youtube.com/watch?v=synOJnwp-jA
https://en.wikipedia.org/wiki/USB_hub
https://www.electronicdesign.com/embedded/what-s-difference-between-usb-20-and-30-hubs

näiteid
https://www.wired.com/gallery/best-usb-hubs-and-docks/