摘要：In recent years, video over IP, also known as IPTV (Internet Protocol Television), has attracted considerable attention on the part of cable operators, phone companies, and other content providers to deliver video programming to viewers (see Clancy, 2006). Simply stated, video over IP involves the transmission of a live or on-demand video signal over an IP communication network and its reception on a television set or a computer monitor via decoding hardware or software. This technology can be used in elementary, secondary, and post-secondary institutions for a variety of educational activities because 99 percent of U.S. public schools are connected to the Internet (U.S. Department of Education, 2004). For instance, notable speakers around the globe can be brought into the classroom virtually in unicast or multicast mode for the benefit of students’ intellectual enrichment. Another distance learning application could focus on two-way domestic or international exchanges between classes. DVTS (Digital Video Transport System) has been used to facilitate discussions about electronic power energy between students from two middle schools in Japan and Korea (Fujiki et al., 2004). DVTS, an open-source software, delivers uncompressed 30 Mbps video between two computers over IP with minimal delay. Video over IP can also be used to backhaul video feeds to a central campus location. Dupagne and Grinfeder (2007) successfully tested the feasibility of using DVTS to transmit live broadcast-quality digital audio and video from remote locations to a television control room over a campus network.
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