FAQ:Why use Packets? Just what is a packet anyway?
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A packet-based system is very flexible and easy to extend in the future. Basically, each packet corresponds to a command for a particular digital decoder (receiver). Each packet contains the address of the digital decoder it is intended for, and some data that tells the digital decoder what to do - for example change to speed 10. It is flexible because you can easily add new packet formats if needed, even ones which can address more digital decoders that the baseline packet format.