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Chapter 13. UPnP > UNDER THE UPNP HOOD

UNDER THE UPNP HOOD

UPnP is a distributed, open networking architecture that leverages TCP/IP and the Web to enable seamless proximity networking in addition to control and data transfer among networked devices in the home, office, and everywhere in between. It comprises the following types of logical nodes:

  • User control point— A set of software modules that facilitates communication between itself and a number of controlled devices on a home network. Examples of devices that could function as a user control point include a standard PC, a digital set-top box, and high-speed broadband modems.

  • Controlled device— A set of software modules that facilitates communication with a user control point. The primary difference between a user control point and a controlled device is that the user control point is always the initiator of the communications session. Examples of devices that could function as a controlled device include VCRs, DVD players, security systems, and automated light controllers.

  • Bridge— A set of software modules that allows legacy devices to communicate with native UPnP devices.

  • Legacy device— Any non-UPnP-compliant device.

  • Bridged device— A device that cannot participate in UPnP at the native protocol level, either because the device does not have sufficient hardware resources or because the underlying media is unsuitable to run TCP and HTTP protocols. Examples of devices that could be bridged devices are power line-controlled A/V equipment, light switches, thermostats, wristwatches, and inexpensive toys.


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