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Old 16th February, 2003, 11:48 PM
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Join Date: September 2001
Location: Europe
Posts: 13,075

USB 2 backward compatibility

Yes, we all know that USB 2 supports USB 1 devices. However, I have a question...

If there's a USB 2 hub connected to a USB 2 port on a PC, and a USB 1 device is connected, what actually happens? When the PC talks to the USB 1 device, does the whole chain (USB 2 port and USB 2 hub) drop down to USB 1 speed, or does the USB 2 hub buffer the data, and then deliver it at the higher speed?

Any views, thoughts and opinions are entirely my own. They don't necessarily represent those of my employer (BlackBerry).
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