The terminology of multiplexing can be confusing. The computer world is filled with protocols such as USB, Ethernet, and TCP/IP. RV-C differs from all of these in one crucial way: RV-C is complete. Not in the sense that everything about the protocol is written – in fact, it will never be complete in that sense, since new products will be introduced and added to the definition far into the future. It is complete in the sense that it defines every aspect of communication, from the type of wire used to the specific data items transmitted. This is not true of most computer protocols, which typically define just one or two “layers”, such as the physical wiring, message routing, or message contents. We'll outline the major layers here.