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Unit 6: Wireless PAN Systems

monitoring devices, such as intrusion alarms, employ acoustic waves at frequencies above the Notes
range of human hearing; these are also sometimes classified as wireless.
The wireless method of communication uses low-powered radio waves to transmit data between
devices. High powered transmission sources usually require government licenses to broadcast
on a specific wavelength. This platform has historically carried voice and has grown into a
large industry, carrying many thousands of broadcasts around the world. Radio waves are now
increasingly being used by unregulated computer users.
Humans communicate in order to share knowledge and experiences. Common forms of
human communication include sign language, speaking, writing, gestures, and broadcasting.
Communication can be interactive, transactive, intentional, or unintentional; it can also be verbal
or nonverbal. In addition, communication can be intrapersonal or interpersonal.

We owe much to the Romans that in the field of communication it did not end with the Latin
root communicare. They devised what might be described as the first real mail, or postal system,
in order to centralize control of the empire from Rome. This allowed Rome to gather knowledge
about events in its many widespread provinces.

Did u know? The first wireless transmitters went on the air in the early 20th century using
radiotelegraphy (Morse code). Later, as modulation made it possible to transmit voices and
music via wireless, the medium came to be called “radio.” With the advent of television,
fax, data communication, and the effective use of a larger portion of the spectrum, the term
“wireless” has been resurrected.

6.3.4 Mixing Media

The diagram below illustrates a simple example of a Mixed Media network. This network has
only 3 computers:

z z one with a Wireless network adapter;
z z one with an Ethernet network adapter; and
z z one with both Wireless and Ethernet adapters.
Figure 6.2: Mix Media Network

Source: http://www.practicallynetworked.com/networking/mmr_intro.htm

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