Now let's take a look about on the wireless networks types. We have several types of wireless networks that are used in communications, so
our course will focus on the WiFi network. But we can explore some types of the wireless networks that can be used in connecting devices and communicating them. Tow the Internet.
The difference between each off the wireless networks mainly lies in two features. It's the frequency range that is used by this wireless network and the covered area that is used by this wireless network,
the frequency range used by this wireless technology and the covered area by this technology,
the bend with the distance, the speed
are the main features that differs one wireless technology, then another. We have a variety of wireless technologies that are used in our daily life, such as the radio and television. Either to restore aerial or satellite
terrorist Ariel and can be from the satellite. The same is the television,
so both can be emitted from terrestrial stations or from the satellite in the sky. We have the G M. D. S s, which are used by ships to transmit their information and even their signals off emergency from the oceans. Tow the land
we have in each country the police and R B
walkie talkies and wireless network to communicate through each other as persons from the police or the Army. In a safe and on a separate network. We have the airplanes that uses the networks to transmit signals between the
civil airplane and the airport or the military airplane and the airport.
We have the GSM, the global system mobile for the mobile phones and the smart mobile phones we hold in our hands. We have the Bluetooth technology that is used for transferring data in small geographical areas. We have the infrared that are used by the remote controls.
We have the Y mix, which is a wen technology for transferring data.
And finally we have the WiFi, which is a land technology for transferring data, and the WiFi is the core off our section. Here.
Let's talk about the frequency ranges. We have
a license, that band
and on eyes and bend a license. That Ben means that you need a license to use this bent for your communication. A license from the regulatory authority existing inside your country to be able to transmit and receive signals over this band,
and you have the eyes and bandit. Can you be used for industrial scientific medical? That's what I sam stands for.
Industrial, scientific and medical applications without the need for obtaining license.
The WiFi lies in the ice and banned. Many wireless technologies are
inside the ice M band that can be used in transmission and receiving signals without the need off licensing from the regulatory authority,
any regulatory authority inside a country is responsible of the spectrum management off this country is responsible off dividing the frequency range inside this country. Among the authorities that has been mentioned in the lost slide among the military and civil among the
ah, satellite and hysteria. Red radio and television, too.
Avoid interference and toe
save some door band between the frequency range is used for the different applications existing inside the country. All through the regulatory authority is responsible for quality monitoring, off mobile phone calls, off satellite communication and satellite television and settle, I'll trade you.
It has the authority off
requesting from the mobile operators toe handle the phone calls in a better way or to offer better voice quality for their mobile phone calls. It is responsible for the rules and regulations. Toe
offer Fair play game between the mobile operators, for example, or between
companies that are offering video service is over wireless networks.
Each regulatory authority inside any country should have the research and development department that are responsible for funding and
directing the research and development inside this country in the wireless communications domain. And ask them for the up today technologies and the most reasoned ah, research is that has been done over this type of communication.
Let's have a look at the global system of ill, and the GSM is a very important component off the Internet nowadays,
so many mobile devices connect to the Internet fruit, the GSM network. So we need to know more about this g s another. Let's have a look at this diagram and see that the laptop or the mobile phone
is connected wirelessly. Tow the BTS BTS is something like a tower
that exists in the street, and it is fix it, but it is covering
surrounding area toe. Allow the mobile phones and laptops tow connect wirelessly through it. So the world infrastructure that is behind it. So the BTS is a very important component to be spreading over the whole area that needs to be covered by the wireless network.
It allows for the mobile devices, the moving, moving devices inside the place to connect through it,
do with a wild infrastructure. We have the PS, the PSD and network, which is the public switch. A telephone network that is the world, not we're connecting the
land phones there, fixit phone lines, and we have the Internet that may use the infrastructure off the mobile network and the PSD, another tow connect mobile devices and fix the devices to the Internet, to the servers of the Internet to the World Wide Web.
So we have the Internet as the largest network
in the world and the network of networks that can allows the excess to mobile devices through the mobile at work or to fix the devices through the PSD en tow. The World Wide Web network,
the GSM has passed through several generations. We have the first generation, second that generation 3rd 4th and fifth, and we have the lt which is the long term evolution. The main difference between each generation and the other lies in the bend. With the speed of connection,
each generation is better in its speed and allows for more applications and more
security features from a generation toe. Another. In the fourth generation, we can have a look at some video communication that can
exist and that wells not there in the third or the second generation off more vials we can see in the fourth generation more security features. And as well, we can see the fifth generation that is still
coming and in progress,
bandwidths and more availability for video communication and more security features than the fourth and the third and the second generations,
the Bluetooth. The Bluetooth is a very common way to connect some mobile devices that are not so remote in distance. It's a standard for short distances that can reach 10 meters or something like this. It uses short wavelength is
that lies in the eyes and band industrial scientific medical bend, which means that using Bluetooth needs lower no license.
You can establish a personal area network using the Bluetooth personal area between two or three or more mobile devices, smart phones that are equipped with Bluetooth guards to communicate with each other. Using this technology in a limited area,
the Bluetooth is managed by the special interest group as I G off Bluetooth.
It has the standard number,
802.15 from the IEEE
Blue toes. It's acceptable to barriers and walls, which means that if
two devices needs to connect to
each other using the Bluetooth,
there should be no walls or barriers between them. If they will connect through Bluetooth, otherwise the connection will fail.
The infrared is a very known way for wireless communication. It uses the electromagnetic radiation it uses longer wavelength is than the visible sight, the visible light. It is a short range communication. It is most commonly used by remote controls to switch between channels and things like this
device, any electrical device or any device that he needs to be controlled remotely.
Their infrared is just like the Bluetooth is susceptible to barriers and wolves. And if there is a barrier or wall between the remote control and the device needs to be controlled, that communication fails.
The Rhyme X, which is another form of wireless communication,
It is a went technology. It is invented, and I mean it is managed by the
It has the standard number, 802.16 from the IEEE. Why I'm extends for worldwide interoperability for microwave excess. It is competing now with the Lt or the long term evolution as a when technology.
They are both competing now, as when technologies connecting devices with better speed with higher capabilities with more security features.
The why Max can provide the triple play communication. And let's explain what is triple play. The triple play is allowing for data, voice and video to exist over the same connection over the same wire over the same outlet inside the building,
which means that you receive
information streams through one outlet, and this outlet is then
spreading toe. Several devices. One outlet for the Fixit phone for the voice, another outlet for the laptop for the Internet and the third outlet for your television. Four streaming video video on the men, for example, to your television.
So the why Max can enable this triple play communication. Triple play communication is one off. The trends in communication
toe enable all off the communication channels to co exist with each other inside one channel and with one outlet, tow the user.