USB : Overview    USB Is Like A Railroad  

One of these shipping classes (which is analogous to USB HID class) requires our company to declare, in advance, exactly what freight (data) items we want to send, how big each item is, and how those data items will be arranged.

We also have to provide a kind of catalog description of the item, so that anyone can understand what each item is and what it is used for.

 
  

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