May 2024
Intermediate to advanced
309 pages
13h 33m
English
Content preview from Data Communications and Computer Networks by Pearson
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Transmission Media 81
Figure 4.19 Infrared Waves
the PC. Since infrared signals transmit through line-of-sight mode, the infrared port must be pointed
towards the PC for communication.
Communication Satellites
A communication satellite can be referred to as a microwave relay station. A satellite links two or more
ground-based (earth) stations that transmit/receive microwaves. Once a satellite receives any signal on a
frequency (uplink), it repeats or amplifies that signal and sends it back to earth on a separate frequency
(downlink). The area shadowed by the satellite (see Figure 4.20) in which the information or data can
be transmitted and ...
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