R

	Real-Time
	The processing of information that returns a result so rapidly that the interaction appears to be instantaneous. Videoconferencing is an example of a real-time application. This kind of real-time information not only needs to be processed almost instantaneously, but it needs to arrive in the exact order it's sent. A delay between parts of a word, or the transmission of video frames out of sequence, makes the communication unintelligible.
	Receiver (Rx)
	An electronic device which enables a particular videoconference signal to be separated from all others being received by an earth station, and converts the signal format into a format for video, voice or data.
	Room (Group) based videoconferencing
	Videoconferencing using a sophisticated system. Appropriate for large groups (See Desktop videoconferencing).
	Router
	A device or set-up that finds the best route between any two networks, even if there are several networks to traverse. Like bridges, remote sites can be connected using routers over dedicated or switched lines to create WANs.
	RS-232-C
	A set of EIA standards specifying various electrical and mechanical characteristics for interfaces between computers, terminals, and modems. The standard applies to both synchronous and asynchronous binary data transmission at rates below 64 kbps.
	RS-449
	An EIA standard for a 37-pin data communications connector, usually used with RS-422 or RS-423 electrical specifications.