4.1.1.2 USB Devices
USB devices are one of the following:
• Hubs, which provide additional attachment points to the USB
• Functions, which provide capabilities to the system, such as an ISDN connection, a digital joystick, or
speakers
USB devices present a standard USB interface in terms of the following:
• Their comprehension of the USB protocol
• Their response to standard USB operations, such as configuration and reset
• Their standard capability descriptive information
Additional information concerning USB devices may be found in Section 4.8 and in Chapter 9.
4.2 Physical Interface
The physical interface of the USB is described in the electrical (Chapter 7) and mechanical (Chapter 6)
specifications for the bus.
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