This chapter presents information about how data is moved across the USB. The information in this chapter
affects all implementers. The information presented is at a level above the signaling and protocol
definitions of the system. Consult Chapter 7 and Chapter 8 for more details about their respective parts of
the USB system. This chapter provides framework information that is further expanded in Chapters 9
through 11. All implementers should read this chapter so they understand the key concepts of the USB.