Haha read your comment before I watched the video and thought it was a bit odd - which made me smile when he said it. Not to say I don’t watch random videos at random places and inappropriate times. I love and hate The internet for the way it’s changed our lives. Keep watching brother x
"Wifi is carrying a set of instructions to tell your computer what to do to each pixel on your screen"... come on guys, that's not what happens at all. that's a gross oversimplification and implies all processing is done remotely and that wifi can only be used for internet browsing. Why not explain TCP/IP first?
Skellious yes, I have a channel, but I don't have a proper camera and only record videos over the various DirectX9+ APIs (Nvidia ShadowPlay, previously Xfire) and process them. Besides, I'm quite bad at presenting for NeuroSocial-reasons. But I've expanded my post a bit. Also - since I'm i.a. SystemEngineer for Networks - I wrote a textbook during my studies/advanced training, of which I want to publish it's Table of Contents and some example-Chapters in Dropbox. I simply haven't yet time to do so (severe illness + was - and still am - in the process of moving to a new apartment (within germany)). Nowadays I'm more interested in holistic health (physical+mental; PersonalTraining, SportsMedicine, Psychosomatics, Medical Training (rehab/injuries/orthopedic reasons), Active Rest (for me Medical QiGong) and Language as translation (English at native levels, japanese, standard Chinese/Mandarine, and maybe Spainish).
I hoped for a more informative video on it's communication protocol... handshakes... data... etc. Seeing it broken down visually would have been good. This was OK though. Nothing to complain about. For more information do a search.
Not to confuse terminology, Wi-Fi is a name of a standard of WLAN networks that follow IEEE 802.11 standard. What you have explained is how Wireless Local Area Network works in general, and Wi-Fi is a WLAN network between Wi-Fi certificated devices by certain standards.
chaquator That extent then is a VERRRYYYY far stretch. I would like to see them make a video detailing from start to finish how the wifi data received turns into those "pixels on your screen". It's going to be a pretty lengthy video.
chaquator Yeah, exactly. They could have gone over at LEAST the basics. But they just went from point a to point b, IN A MAZE, without explaining the directions.
Thank you very much, I always wanted to know what WiFi is and how it works. Could you please make a video that explains how the router creates WiFi and how data works, like how does the router know the monthly WiFi it gives and how security works in the router that connects through data
the representation of the visual wifi signal is wrong though. You wouldn't be able to see the pulses move through the air. Just like light, you would see objects that reflect them into your eye, unless you look directly into the wave source, in which case many of the "wifi rays" hit your eyes directly, much like looking into a light bulb. In a sense, seeing wifi would look very much as if you are looking at a street with old school street lamps on (that emit light in all directions instead of a beam downwards). Only instead of light bulbs, you have wifi routers :P Okay, maybe more like light shining through windows into a dark street, with walls that are made of paper so a bit of light still passes through
please stop calling the waves wifi- wifi is just the name of the connection type, the waves are in the RF band, specifically the 2.4Ghz is in the UHF band, and the 5Ghz is in the SHF band, and they don't radiate in every direction like a bulb, they radiate only when the electron movement is visible as perpendicular to the angle of the observer, it should also be noted that light doesn't just go in a straight line- it refracts and defracts too, and as the RF band is significantly lower frequency these effects are much more pronounced
Marc Purkiss I know too many people, who have mentioned in conversation, on going problems with the wifi connection to their router disconnecting or taking too long and timing out... and of course the ever-popular complaint, of not being able to connect at all, in certain areas or rooms... I get them to show me where the router is located, and typically it will be sitting behindva monitor, on a desk against the outside-wall of a room, on the 2nd floor (or basement). Sometimes against the outside wall which faces the street, and they cant figure out why access in their backyard is poor. First thing I tell them, (if the modem and router are seperate devices, leave the modem where it is, but relocate the wifi router to the main floor, as close to the center of the house...on top of a cabinet for example.. and if possible, in line of sight to doorways.. of course now a Cat 6 cable will have to be run from the modem to the router, which I offer to do... but most of the time they don't like the idea of running lan cable through walls, because "oh that will make such a mess, and I hate seeing wires... and there will be a hole in the wall..."... I assure them no wires will be hanging out of the walls, and the drywall dust will be vacuumed up..and 'what hole? There will be a wall plate with an RJ45 jack behind where the router would be... and if they still don't want to do it, I tell them to get used to it and stop complaining...
Would WiFi work as a military application, in a broken building searching for enemies. The WiFi could perhaps calculate on and off bounces of moving objects and give you their location?
The speed at which EMR travels has NOTHING to do with the speed at which we can transmit data over wifi..... I HATE when people who are trying to educate people, simplify a concept so much that it becomes at it's core Wrong.... PLEASE fix this video to more accurately represent HOW wifi works, OR take it down.
binary data is represented in the electromagnetic wave medium instead of how it is on your computer, then other computers (routers or the client computer) can read the binary data and now they have the binary data that was meant to be transferred from one computer to another what's not to understand
I always thought physics was counter intuitive because it did not make sense to me, but the more I gained knowledge about physics in general the more it slowly started to make any logical sense
The signal is more like a donut than a dome or circus tent because the antenna isn't a point and is mostly directing the signal where its needed, around it not not into the sky. You came close to describing a microwave video sender, which replaces a composite cable, and could directly affect 'pixels' on a flat screen. Perhaps without going into the technical details, you could describe the wifi as a replacement for one shared cable, with collisions that arise when multiple devices try to transmit on it, and how the chosen frequency affects the range as wall penetration increases with wavelength. If the signal 'bumps' into antoher signal, it's corrupted, and not slowed down.
'tell your pixels what to do' He should of prefaced that with 'so say for example, you're streaming a video' I still feel like there's a ton of information missing. He spent ages explaining what EM waves are and how they work, but very little time actually explaining how information is actually transferred and processed by wifi hardware
***** "Heat" is just the vibrations of particles. Infrared heats things up because it's easily absorbed, causing the particles in that object (i.e our skin out in the day) to heat up. But infrared waves themselves aren't really "heat" i guess. If we're talking about heat travelling from one object to another, like convection/conduction, then you do need air the the vibrations to be passed along to adjacent particles, like sound.
***** I just explained it lol. Infrared rays are em waves and they can travel through space. They are absorbed by stuff here causing it to heat up. But I don't know if infrared would be classed as heat..It's like how a microwave heats things up, but if you open it, it's not hot inside unlike an oven.
Heat doesn't need air or other medium to be spread. However it is true that part of the heat is spread by contact and by circulation, part of heat is transmitted via IR radiation which doesn't need anything to be transmitted. In fact air makes IR transmission less efficient.
So, maybe this is a stupid question, but I understand how waves propagate in a medium such as water or air, but where there is essentially "nothing", what is the medium through which EM waves propagate. We understand that space is not an "ether" as they used to think. It's not a "stuff" at all, but just saying they "don't need air" to propagate doesn't answer the question of what they might do need. Basically the question is waves in what? Even saying "quantum foam" doesn't actually answer that question, because it all comes back to it being made out of space, which isn't a "thing".
Well light is an EM wave and science has come up with the "photon" as the light "particle" ... Electrical field + Magnetic field, coupled together. Not really "moving" or "travelling", simply existing in the form of waves and permeating the universe wherever there are electrical charges (moving and static) to generate them. Quantum physics however prefers to speak of "particles". The question isn't easy at all, nor is it stupid in my view. Trying to understand how the other 3 fundamental forces of the universe 'act' or are applied is equally mentally challenging.
I don't care about what frequency is or that it can't go through walls. I already know that stuff. What I came here hoping to learn is how that signal is turned into radio waves and then turned back into information.
I have been wondering about frequency division multiplexing. In a sense, it is like a group of Morse Code operators each their own key to a piano. But in an optical sense, it could be handled with different wavelengths of color. I mean... could we effectively double the bandwidth of fiber if we used red and blue light for the different ones and zeros, but used purple when both are on at the same time?
WiFi does not "control the pixels on your screen". What it does is gather all the signals in your house (and transmits some signals to your computer) via a WiFi router. Then, that router transmits and receives those signals on a higher frequency wave. In other words, it's the analog to a telephone pole transformer.
We do yes… for example infrared radiations or the black body radiations which are usually emitted from objects due to changing temperature of the body in contrast to the environment. And infrared radiations can be observed through gadgets such as night vision glasses which contain certain pixels reacting to the electromagnetic radiations in a certain way.
Could this be more inaccurate in terms of physics and computer science, this is way too over simplified. "Wifi is type of electromagnetic radiation" "Wifi is carrying information to your computer to tell it what to do for each pixel on the screen"
1) C++ and Wifi both links to computer technology. 2) He simplified it to ensure people with less knowledge understands it. He *doesn't* need to go into detail because that is irrelevant. Why would he go into talking about how the output of screens work?
Ok tech nazi. This is called vulgarisation and this is actually super helpeful to make people with no particular background understand the basics of a subject.
Heat is a result of the movement of particles but there you said that it can not travel without a medium. While that is essentially true it can be misleading as objects can be heated up using light (infrared) even in vacuum, thus heat can be transmitted through vacuum, not only physical contact with a medium made up out of particles. So I guess travelling is really a technicality since the energy itself can travel without a medium while the effect is only noticeable in actual matter.
I have a question that I havent been able to find the answer for. What is the rate wifi routers emits radio waves per second? How many times per second does my computer communicate with my router?
This video by Australian scientists explains it better. I’ve watched quite a few, this one makes wifi more understandable ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-esA9YhdgvIg.html
Why are X-Rays shown as having longer than visible light? (1:08) The given measurement is correct, but showing it as longer than visible light is rather confusing.
It doesn't matter, I got the gist of it - now I'm at least smarter than those who nitpick at technicalities and fail to understand this is a 4 minute video on a very complex technology.
As you started explaining how a Wi-Fi signal can be slowed down, the internet here did actually slow to the point of the video not playing. Funny coincidence.
Ehh, I do not think this was all that accurate: 0:38 Why is the top waveform not sinusoidal? It looks like a cube root function. 1:28 and 1:40 OK that is completly WRONG. We do not see light emitted from lights in that way, although that is the radiation pattern. We would see radio waves being emitted like the light from a light directly, and see it reflect and bounce off walls and stuff, a lot like standard light, if we could 'see' the 2.4GHz. The explanation for how it transmits data is also a bit poor, and oversimplified. Oh well, it is a fundamentals concept video, so I can't be too harsh in that regard.
Well for the internet to work it needs to go both ways, for example if you are playing a game and an object moves then your router will let you know but if you move that information will be sent to your router which will be given to the game and to the other players routers and their computers so they can see that you have moved.
@@milesnaguib4630 Wasn't thinking about online gaming..... but strangely enough I was originally thinking about the Evercade VS gaming device when I made my original post as it requires WiFi connectivity for updates but is not needed for the playing of actual games. The Evercade VS seemingly doesn't have an on/ off for the WiFi among its settings, so would it.... 1. Turn the WiFi off when a network isn't selected? Or 2. Continue to scan for a network hour after hour regardless of if the user is wanting to connect to WiFi or not? Even cheap mobile phones allow for WiFi to be turned off when not needed, but the Evercade VS seems to be designed to stay connected to your home WiFi regardless despite the product only ever going to need a firmware update once or twice. Seriously, who designs these products?
Just looking at your profile picture would have been enough for me to think "That's totally the kind of guy that has ethernet cables running all over his house, probably half-tucked under the carpet edges and duct taped around corners".
+Firstname Lastname Lol my room is like a spiderweb of ethernet cables atm... Sometimes feels like a James Bond scene where they have to not touch the red lasers.
It would've been cooler to know how Wi-Fi gets from my router through my walls to my phone. Does the signal actually go through the solid wall? I also have the same question for my so phone when I make phone calls. And my actually sending the signal through the walls of my house into the sky Out into space to hit at satellite has a graphical depictions?
+TrippBOOMOneFunnyGuy The signal goes through the wall, yes. Think of it like glass. We know that visible light (and some non-visible, of course) will pass right through glass, even though glass is solid. It is not too far off, then, to suppose that there are frequencies/wavelengths of light which will pass through wood or other solids which are opaque to visible light.
+TrippBOOMOneFunnyGuy Your phone does not send a signal to space using satellites, but relayed to comms towers on the ground. This is why some networks have better coverage because of better infrastructure. Satellite phones exist though for sure and are used where there is no ground network coverage in remote wilderness such as mountaineering or polar expeditions. Expensive rates though!
I like wifi, which I got to use, early last month, on a flight to Edmonton from Toronto. People should get the chance to check their email while in the air.
So what are the technological limitations? Why aren't there large hundred-km-radius domes around great metropolitan areas and such? Or have the consumer-grade routers just grown much faster for such a technology to not be obsolete?
3:06 WRONG. The high speed of Wifi signal, which is the speed of light, has nothing to do with the quantity of bits (data) transmitted. The quantity of data transmitted is accounted to the frequency of the signal. The higher the frequency, the more data you can send. If the frequency is low, it'll take ages for a video file to arrive completely.
+Nachiket Vartak What got me was the notion that heat, i.e., electromagnetic radiation in the infrared spectrum cannot be radiated through a vacuum. Sheesh!
BigBen Hebdomadarius heat itself is not electomagnetic radiation, it's the collision of matter particles, which by this action emit small traces of infrared radiation. You need matter in the first place to conduct heat. Infrared radiation is the result of heat, not the cause of it.
If we could see Wi-Fi radiation with our eyes, we wouldn't be able to see domes 20-30 metres across. The Wi-Fi routers, and mobile devices, would appear to be glowing. And walls would be transparent (or at least sort of translucent). And they're speaking really fast morse code*, and the devices can see each other through the walls and interpret the morse code*. And if you walk 20-30 metres away from the router, it's hard to see the router anymore. Where did Brit Lab get the idea of magic domes from? * Loosely speaking, they speak QAM-64 or similar instead of morse code.
How do wifi know which data is to be sent to a particular device when multiple devices are connected? Do it assign a particular frequency for each single device connected? please explain this in deep.
+nikhil chandhra It doesn't, it's broadcasted. That's why it can be dangerous to use Wifi networks with devices you don't trust, since the encryption key is shared between the devices on the same network (except for WPA Enterprise).
