Basics USB Support - 21
• Devices, which connect to hubs and provide expanded
functionality to the computer. Devices connect to the host
using either the 1.5 or the 12 Mbps connection speed. Like
hubs, devices may be “bus-powered” by the USB network, or
be “self-powered” by an external power source. Devices can
only connect to hubs. Devices cannot connect directly to
devices, but looks can be deceiving, since some devices are
combined with hubs in the same physical case.
The following tree diagram shows an example of a USB network:
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