The basics - how a packet is forwarded on the RF support - help please
Hello world
Please could you help me understand a concept that can be the basis for most of you, but for me, I don't understand.
When a packet is transmitted to a NETWORK card wireless on a PC to an AP, is a copy of the package even get transmitted several times in many directions by the wireless NETWORK card or antenna?
Please can you be kind and look at the photo I created.
This is how it works.
Also, if this is correct, the number of copies of the antenna package would send?
Thx a lot for all your help,
Kind regards
Ken
Hi Ken,
Here's a useful analogy that could be a bit overused, but I think it is still good :)
Imagine a lake with calm waters. You pick up a stone in the Chuck and it creates waves that radiate outward. It is a very ideal situation for the wireless, with no obstacles and no impedance, the waves continue outward far enough, depending on the size of the stone (the power of radio, if you want).
Now imagine you have an obstacle, say a big rock sticking above the surface of the water. If you chuck now a stone in, waves radiate outward like before. However, when they hit the rock, what happens? You probably already know - the kind of waves to bounce off the rock, but they did this also around him. In fact, apart from a small "shadow" directly behind the rock, the waves actually bend around and 'cover' behind him. In the end, you will see those concentric circles that extends well beyond the rock, once again as long as there was enough power behind the stone falling into the water.
When the waves wireless struck a barrier, there are differences, but the concepts are essentially the same. Some waves will bounce, and others will bend around it. Some go through the object if possible. That's why the WiFi waves can spread throughout a building. This wavelength waves work a little differently than visible light. The color blue, for example, is about 450 nm in length. It is not really possible for the color to penetrate opaque objects and refract around so much as a wave of 12 cm is able to do. You can't really think WiFi waves such as visible light.
Finally, this stone fall to created a disturbance, but it was a unique force which disappeared pretty quickly. Now, imagine a large mast which ensures the pump vertically in the middle of the Lake. As it pumps up and down, it creates wave radiating outward. If she pumped up and down, it can create big waves, but if it goes up and down, it can create small. Regardless of the size of the wave that is created, it's the same wave that spreads everywhere.
Wireless is a kind of push/pull the concept, where electricity is applied to an antenna and it pushes a wave wireless outwards. The electricity is off and the wave interrupts as well. So anything that radiates outwards will always be the same wave, until this wave hits a barrier or obstacle, as described above.
Sorry, that was a bit long. :( Who help me at all, and which is what you are looking for?
The f
Tags: Cisco Wireless
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