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INPUT INTERFACES

One way to feed content into the media player is via a CD or DVD in the media player's DVD player. However, the most versatile interface is the network interface. The key element to all this versatility is the use of Internet Protocol (IP) packets to distribute the content to the media players. The IP packets are then encapsulated into Ethernet packets that can be carried in 8-wire twisted-pair cables (though not all of the wires are used today). The twisted-pair cables use RJ-45 connectors (Figure 4.29).

IP can be used to carry any kind of digital information, not just audio, video, and teletext or other metadata as in conventional digital television systems. In Chapter 5, we will take a closer look at how the media player can use the IP Ethernet interface to retrieve any kind of information, such as files from a server, or to receive streaming content. Using IP, we get an infrastructure that does not have to be changed when new transmission formats or standards are introduced.


  

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