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42 INTELLIGENT COMMUNICATION SYSTEMS
FIGURE 5.6 Video conferencing system.
FIGURE 5.7 Distance learning system via satellite,
video transmission and MPEG2 5-6 Mbits. A diagram of the setup is shown in
Figure 5.6.
5.4.4 Satellite Communication System
A satellite communication system involves a transmitter and a receiver installed
at each station. A server sends information to its destination via satellite and
receives a response from the destination via satellite. Between a source and its des-
tination, an in-bound channel and an out-bound channel are established to conduct
communication. In the distance education, two channels are established between
a main campus and a satellite campus. When there are two or more sites, the
number of channels is increased, making this type of setup very expensive.
One-way transmission is widely used in distance education. In mis system a trans-
mitter is installed at the main campus, with receivers installed at satellite campuses.
The lectures are broadcast from the main campus to the satellites simultaneously.
