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Xuwanghuan  
#1 Posted : Friday, May 17, 2019 2:30:16 PM(UTC)
Xuwanghuan

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Computers > Networking > Computer NetworkHow Do Wireless Networks Work?
Posted by nick_niesen in Computers on October 26th Kaleb McGary Falcons Jersey , 2010


Wireless networks work using radio waves instead of wires to transmit data between computers. That's the simple version. If you're curious to know what's going on in more detail, then it's all explained in this article.


Ones and Zeros.


I'm sure you know that computers transmit data digitally, using binary: ones and zeros. This is a way of communicating that translates very well to radio waves, since the computer can transmit ones and zeros as different kinds of beep. These beeps are so fast that they're outside a human's hearing range -- radio waves that you can't hear are, in fact, all around you all the time. That doesn't stop a computer from using them Chris Lindstrom Falcons Jersey , though.


Morse Code.


The way it works is a lot like Morse code. You probably already know that Morse code is a way of representing the alphabet so that it can be transmitted over radio using a dot (short beep) and a dash (long dash). It was used manually for years, and became a great way of getting information from one place to another with the invention of the telegraph. More importantly for this example, though, it is a binary system, just like a computer's ones and zeros.


You might think of wireless networking, then Tevin Coleman Youth Jersey , as being like Morse code for computers. You plug a combined radio receiver and transmitter in, and the computer is able to send out its equivalent of dots and dashes (bits, in computer-speak) to get your data from one place to another.


All About Frequencies.


You might wonder, though, how the computer could possibly transmit enough bits to send and receive data at the speed it does. After all, there must be a limit on how much can be sent in a second before it just becomes useless nonsense Duke Riley Youth Jersey , right? Well, yes, but the key to wireless networking is that it gets around this problem.


First of all, wireless transmissions are sent at very high frequencies, meaning that more data can be sent per second. Most wireless connections use a frequency of 2.4 gigahertz (2.4 billion cycles per second) -- a similar frequency to mobile phones and microwave ovens. As you might know, though Austin Hooper Youth Jersey , a frequency this high means that the wavelength must be very short, which is why wireless networking only works over a limited area.


In addition, wireless networks make use of a technique known as 'frequency hopping'. They use dozens of frequencies in the range they are given, and constantly switch between them. This makes wireless networks more immune to interference from other radio signals than they would be if they only transmitted on one frequency.


Access Points.


The final step is when it comes to all the computers on a network sharing Internet access. This is done using a special piece of wireless equipment called an access point. Access points are more expensive than wireless cards for one computer, as they contain radios that are capable of talking to around 100 computers at the same time, and sharing out access to the Internet between them. Dedicated access points are only really essential for larger networks Deion Jones Youth Jersey , though -- if you only have a few computers, it is possible to use one of them as the access point, or you could just get a wireless router.


They Understand Each Other.


That's all well and good, then, but how does wireless equipment made by entirely different companies manage to work together when this is all so complicated? Well, the answer is that there are standards that all wireless devices follow. These standards are technically called the 802.11 standards Keanu Neal Youth Jersey , and are set by the IEEE (Institute of Electrical and Electronics Engineers). It is thanks to people sticking to their standards that wireless networking is so easy and cheap to use today.


You Don't Need to Worry.


If all this talk of frequencies has you a little worried, you don't need to be -- wireless networking hardware and software handles all of this automatically, without you needing to do a thing. Don't think that you're going to have to tell one wireless device what frequency another is using, because it's just not going to happen, alright? Wireless networking, for all its complicated workings Takkarist McKinley Youth Jersey , is really far more simple to use than you'd ever expect.


DAMASCUS, Sept. 29 (Xinhua) -- The Islamic State (IS) group cut off the main road to Syria's eastern province of Deir al-Zour, as the Syrian army laid a siege on the IS militants in areas under their control inside the province's capital city, activists said.


A large number of IS militants attacked Sholah, Kabajeb in the countryside of Deir al-Zour, on the main road leading to the capital city on Thursday.


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The army secured those areas recently before the IS militants unleashed their surprise attack on Thursday.


The Observatory said Friday that the IS militants were advancing in the areas they attacked on Thursday.


The road from Damascus to Deir al-Zour stretches through the desert region in the remote eastern countryside of Homs province in central Syria all the way to reach Sholah and Kabajeb in the countryside of Deir al-Zour before entering the city.


The Syrian forces and its allies captured Sholah earlier this month when they broke the IS's three-year siege on Deir al-Zour capital city, and cleared the main road to the city.


Several checkpoints are set up across the road, surrounded by large swathes of desert, which makes it easy for IS militants to sneak in, particularly when the sun falls.


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