USB : Overview    USB Is Like A Railroad  

In the shipping class (USB class) we are using (HID class), we have to specify in advance exactly what freight (data) will be contained in each shipment (Report).

A shipment (Report) can contain more than one railroad car (Packet).

A shipment (Report) can be larger than a single railroad car (Packet), in which case it will probably be split among several trains (USB Frames). There are rules about how our cargo must be split up, but we don’t want to get bogged down in too many details here.


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