A compound device is like an "internal" USB hub (often implemented in software on the device), which allows various sub-devices to connect.
USB hubs handle fan-out to a number of control modules and extend the distance that can be reached.
A USB hub is a device that expands a single USB port into several so that there are more ports available to connect devices to a host system.
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USB hubs are often built into equipment such as computers, keyboards, monitors, or printers.
USB On-The-Go does not preclude using a USB hub, but it describes host/peripheral role swapping only for the case of a one-to-one connection where two OTG devices are directly connected.
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In 2007, the French national museum, Centre Georges Pompidou, in Paris acquired LaCie products for its permanent collection including Poulton's "le Coq", "d2"," LBD", "Firewire Speakers", "Pocketdrive" and "Rugged", Ito's "Brick" and "USB Hub", and two Porsche Design drives.