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Wi-Fi was created in the 90s. Now many years have passed and many people don’t
really know what Wi-Fi is or how it works. Most of us just associate it with
being internet, but that’s not entirely correct. Yes, Wi-Fi devices supply
internet access but they are not the internet.
Invention Of Wi-Fi
Did you know that How Wi-Fi was invented? An Australian scientist,
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>John O’Sullivan > >, wanted to prove one of Stephen Hawking's black hole theories
correct. He and his team were developing a tool that could identify and filter
specific radio waves. Unfortunately, the tool they created didn't help in
finding black hole radio waves. Fast-forward a few years,
John O’Sullivan was working for the CSIRO (Commonwealth Scientific and
Industrial Research Organization). His project was to find a way for computers
to communicate wirelessly. He went back to his “failed invention” changed and
tweaked it. Thanks to John O’Sullivan and his team, Wi-Fi was invented.
What Is Wi-Fi?
First, let's cover some of the basics.
Wi-Fi stands for Wireless Fidelity and is the same thing as saying WLAN
which stands for "Wireless Local Area Network".
Wi-Fi works on the same principal as other wireless devices - it
uses radio frequencies to send signals between devices. The radio
frequencies are completely different say from walkie talkies, car radios, cell
phones, and weather radios. For example your car stereo receives
frequencies in Kilohertz and Megahertz range (AM and FM stations), and
Wi-Fi transmits and receives data in the Gigahertz range.
For Wi-Fi this frequency happens to be 2.4Ghz and 5Ghz. These waves are
very similar to the frequency found in your microwave! Your microwave uses
2.450Ghz to heat up food and your router uses 2.412 GHz to 2.472 GHz to
transmit your data over Wi-Fi. This is why some people with old or faulty
microwaves experience a problem with their Wi-Fi signal when they use
microwave.
Just to clear up a popular misconception: These microwaves are non-ionizing
radiation. That means that they do not cause cancer. Interested in debunking
other myths ? Read the the article :
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>Medical Myths Debunked >.
Wi-Fi Hotspot
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Before jumping into Wi-Fi Hotspot you need to understand about two devices,
wireless adapters and wireless routers.
A wireless adapter enables the device to connect to WLAN point.
Wireless adapters often come in USB stick form, which must be plugged into a
USB port of a computer or device. Wireless adapters may also come in the form
of PCI network cards that plug into a PCI slot on the computer motherboard.
New technology has made wireless adapters somewhat obsolete, as new
generations of portable computers generally have built-in wireless
connectivity that can be enabled or disabled as needed.
use to connect you to their cable or xDSL Internet network. >
A wireless router, also called a Wi-Fi router, combines the networking
functions of a wireless access point and a router. A router connects local
networks to other local networks or to the Internet. A wireless access point
connects devices to the network wirelessly, using radio frequencies in the 900
MHz and 2.4, 3.6, 5, and 60 GHz frequency bands.
A Wi-Fi hotspot is simply an area with an accessible wireless network.
The term is most often used to refer to wireless networks in public areas like
airports and coffee shops. Some are free and some require fees for use, but in
either case they can be handy when you are on the go. You can even create your
own mobile hotspot using a cell phone or an external device that can connect
to a cellular network. And you can always set up a Wi-Fi network at home.
home-based network >, the first thing you'll need to do is make sure your computer has the right
gear. Most new laptops and many new desktop computers come with built-in
wireless transmitters, and just about all mobile devices are Wi-Fi enabled. If
your computer isn't already equipped, you can buy a wireless adapter that
plugs into the PC card slot or USB port. Desktop computers can use USB
adapters, or you can buy an adapter that plugs into the PCI slot inside the
computer's case. Many of these adapters can use more than one 802.11 standard.
Once you've installed a wireless adapter and the drivers that allow it to
operate, your computer should be able to automatically discover existing
networks. This means that when you turn your computer on in a Wi-Fi hotspot,
the computer will inform you that the network exists and ask whether you want
to connect to it. If you have an older computer, you may need to use a
software program to detect and connect to a wireless network.
Frequently Asked Questions: Wi-Fi
Q: Which Wi-Fi channel is best?
A: For best results, it is highly
recommended to keep the 2.4 GHz channels to 1, 6, and 11, as these channel
settings will allow for virtually no overlap in the Wi-Fi signal.
Q: Can Wi-Fi cause headaches or is harmful?
A: The chance
of increasing number of headaches and the level of severity of headache for
persons who had high use of Wi-Fi were significantly higher than the persons
with low use of Wi-Fi. The use of Wi-Fi had no significant effect on the
number of migraine attacks
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>source >. For Wi-Fi this frequency happens to be 2.4Ghz and 5Ghz. These
waves are very similar to the frequency found in your microwave! These
microwaves are non-ionizing radiation. That means that they do not cause
cancer.
Q: Can Wi-Fi pass through walls?
A: In theory, Wi-Fi
signals are capable of passing through walls and other obstacles relatively
easily. However, in reality, some walls are thicker or use reinforced concrete
and may block some of the signals. Materials such as drywall, plywood, other
kinds of wood and glass can be easily penetrated by wireless signals.
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