3G and 4G wireless connections are now common for smartphones but also laptops and tablets. Finding a public Wi-Fi hot spot can be difficult.Infrared and visible light easily blocked by objects.Infrared only for short distances - in the same room.Slower data transfer than hard-wired methods.(infrared, light, radio) Wi-Fi uses radio waves. (But all those electromagnetic things are plenty odd!) Wireless So it's not quite as odd as it first appears. In their "particle" life, they do behave like a bunch of physical particles. Sometimes they are treated by scientists like streams of teeny, tiny particles and other times like waves on the beach. It may seem odd to call microwaves, radio waves, or light a "physical" medium. Not susceptible to interference Transmits fasterįor longer distances or when cables are not practical, other transmission media come into play. Subject to interference = static and garble Transmission media just means the physical materials that are used to transmit data between computers.įor communications between computers that are linked by cable, there are three choices. With such complex communications channels, we need to be aware of the capabilities and limitations of the various media in use.
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