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| Online learning definitions (P - Z) | Point of Presence (POP): Point of connection between an interexchange carrier and a local carrier to pass communications into the network.
Point-to-Point: Transmission between two locations.
Point-to-Multipoint: Transmission between multiple locations using a bridge.
PPP: A software package which allows a user to have a direct connection to the Internet over a telephone line.
Protocol: A formal set of standards, rules, or formats for exchanging data that assures uniformity between computers and applications.
Satellite TV: Video and audio signals are relayed via a communication device that orbits around the earth.
Serial Line Internet Protocol (SLIP): Allows a user to connect to the Internet directly over a high speed modem.
Server: A computer with a special service function on a network, generally receiving and connecting incoming information traffic.
Slow Scan Converter: Transmitter/receiver of still video over narrow band channels. In real time, camera subjects must remain still for highest resolution.
Synchronous: Instruction occurring in real-time.
T-1 (DS-1): High speed digital data channel that is a high volume carrier of voice and/or data. Often used for compressed video teleconferencing. T-1 has 24 voice channels.
T-3 (DS-3): A digital channel which communicates at a significantly faster rate than T-1.
Telecommunication: The science of information transport using wire, radio, optical, or electromagnetic channels to transmit receive signals for voice or data communications using electrical means.
Teleconferencing: Two way electronic communication between two or more groups in separate locations via audio, video, and/or computer systems.
Transmission Control Protocol (TCP): A protocol which makes sure that packets of data are shipped and received in the intended order.
Transponder: Satellite transmitter and receiver that receives and amplifies a signal prior to re-transmission to an earth station.
Video Teleconferencing: A teleconference including two way video.
Virtual: Not concrete or physical. For instance, a completely virtual university does not have actual buildings but instead holds classes over the Internet.
Virtual classroom: The online learning space where students and instructors interact.
Uniform Resource Locator (URL): The address of a homepage on the WWW.
Uplink: The communication link from the transmitting earth station to the satellite.
WBT (Web-based training): Delivery of educational content via a Web browser over the public Internet, a private intranet, or an extranet. Web-based training often provides links to other learning resources such as references, email, bulletin boards, and discussion groups. WBT also may include a facilitator who can provide course guidelines, manage discussion boards, deliver lectures, and so forth. When used with a facilitator, WBT offers some advantages of instructor-led training while also retaining the advantages of computer-based training.
World Wide Web (WWW): A graphical hypertext-based Internet tool that provides access to homepages created by individuals, businesses, and other organizations.
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