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Wan Light Lyrics


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In the heart of sarah freeman After glory comes the pain Well you tried too hard And the…


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Todd T

NO.


Broad band cable means MULTIPLE SIGNALS BEING TRANSMITTED on cable at the same time. Broadband is not unique to cable.


DSL is a TRANSMISSION TECHNIQUE and it isn't limited to phone wiring.


Fibre Optics is a PHYSICAL MEDIUM for transmitting light.


Cable internet travel over a hybrid fibre-coaxial network whereby the coaxial is in the access layer, which is where the customers will connect. Any sharing of data capacity is done at the main office. Sharing of the network capacity, which is not the same thing is done locally in the neighbourhood, which are not the same thing. This is a capacity based network where the modems are limited by a configuration file given to them by a server when they registered on the network. If a modem has a very high data need, the system can let that modem use data in the neighbourhood that other modems aren't using. Comcast calls this speedboost. You will be able to exceed your subscribed speed almost all the time due to internet's usage being bursty and not a consistent need. If your cable company puts too many people on one link, it can get slow, but that is their fault, not the technology. They need to either segment the users or add more capacity.


DSL uses a DSLAM (Digital Subscriber Line Access Multiplexer) that has to be within 2-3 miles of the homes because the further you get from the DSLAM, the slower the speed will be. Also you would feed a 48 port DSLAM with a singe 100 megabit connection. The DSLAM will chop that up and send it to 48 houses. Each line cannot borrow unused data from the other lines, so you get what you get and nothing more. If you want to add a 49th customer, you add another DSLAM. Then you would ... remove the 100mb connection from the first DSLAM and stick it into a switch and use two outputs from the switch and feed both DSLAMs. A switch has a 95% switching efficiency so each DSLAM gets 95 megabits....aaand chops that up into little pieces aaaand suffers from distance loss. This is why stuff like U-Verse puts the DSLAMs deep in your neighbourhood so you don't suffer any loss due to distance. but now you have ugly DSLAM "refrigerator cabinets" on every block. The more DSL users per cable bundle, the more interference you get. So if a main phone cable going to a specific subdivision has more than 79 percent of it's phone subscribers subscribing to DSL, they will cause interference with each other because unshielded copper is susceptible to noise interference.


Fibre Optics, like I said is not a technique but a transmission medium. Fibre has no speeds. Fibre is not fast, the equipment on the end, which runs on electricity is what makes the network fast or slow. That is the limit. Fibre has an advantage of carrying those signals from the equipment great distances with little to no resistance at the quickest speeds possible. Fibre uses less energy to do so because it uses photons instead of electrons. Fibre has the advantages of using different lightwaves to deliver multiple data streams over the same piece of fibre and they cannot interfere with each other so it has the greatest capacity over the greatest distance. If the transceivers on each end can't modulate and demodulate the signals faster than the speed of light, there is your limitation to speed. The most common last mile technology that fibre uses to get to your house is called a PON (passive optical network). Whereby many people SHARE a single data source which can be switched at great speeds. It is, in basic terms, a copy of a cable companies coaxial network. The system must be segmented or there will be too many people per segment causing not only speed issues but interference with each other.


If you take away one thing from this, I hope it is that you understand a network shares resources. At no time are you on any network and you are not sharing. Anybody who tells you anything less is a complete moron. Guess what happens when you are on the internet? (interNETWORK).


Finally fibre has NO speeds. It is not fast. It is a medium that provides the fastest possible connection between two or more devices. Those devices are what talks fast....



Warp Speed Power

Your video is a great educational tutorial as always. You explain very, very well. But we need to expand this a bit because what happens in the real world is not as basic as your explanation.

A.) Basic DSL (no fibre support) has been marketed by the telcos as being faster at all times since the early days. As you indicate correctly, each customer has a dedicated connection, as opposed to a shared connection with cable Internet. The reason why the telcos push this so strongly is to hide the deficiencies with this technology. 1. You are connected to your local interchange (building that houses equipment that controls the phone line connections in your area). If you are more than 4km away from this building, then your connection speed (bandwidth) will drop below the maximum that can be provided. The further away you are, the less bandwidth you can expect. Which is why all the telcos state "up to XXMbps". Now the distance from your location to the interchange isn't measured in a straight line (geographically speaking). It is measured by the length of the phone lines from the interchange to you. Hence, you could be 2km away from the interchange (geographically), but the phone lines could measure 6km or more. They zig-zag throughout your community. The telcos however still charge customers for bandwidth packages that cannot be delivered. Since most people are not tech-savvy enough to understand how this works, they don't check the connection and therefore (usually) don't complain. Example of how this works: The telco can deliver a maximum of 100Mbps over 4km of phone line. The customer is located within a 4km radius of the interchange, but the phone lines to their location measure 8km. The customer orders a 50Mbps connection from their telco, and the customer service person says "yeah, that should work fine since you're within a 4km radius of the interchange". Customer gets the DSL connection installed and pays the 50Mbps price/month. In reality the customer is only getting 15Mbps maximum because the 8km of phone line cannot support more than that. (I'm making these numbers up just for demonstration purposes, but this is the typical situation you may encounter). If the customer isn't tech-savvy enough, then he/she will never figure this out. And so the telcos essentially cheat customers into paying for something that they cannot deliver, which I would suggest is criminal fraud. A quick test using Speedtest.net will confirm what you are actually getting. At least 80% of the homes that I have tested over the years do not get what they are paying for ladies and gentlemen. 2. If the interchange is set up to handle a maximum of 500 connections at a time (for example), and yet the telco has 1000 customers for that interchange, then what do you think will happen? If more than 500 try to connect simultaneously with their username and password, the server will allow them to connect, hence giving the impression that you are "connected to the Internet". Yet for some reason you can barely surf the Internet. It works, then it doesn't work, then it works again. What's going on here? Well folks, they've set the connection server up in such a way that it will control the data flow like an intersection with green and red lights. They stop you to let another person go, then they stop the other person to let you go. And so it keeps on going and going. Another instance of fraud being committed against the paying customer. 3. If the building and/or area that you are located in has very old copper wiring, then you can expect not only lower bandwidth, but poor signal stability. Even an old phone jack can cause problems. When I say very old, I mean before the 1970's.

B.) With basic cable Internet (no fibre support) you usually don't have the problem of lower bandwidth because of distance. With cable the ISP can install boosters along their lines in order to maintain bandwidth speeds. Boosters cannot be used with DSL, I've asked. Where I live the cable ISP has always done this and I've never ever had a problem with bandwidth. In essence you actually get the bandwidth that you are paying for! The only problem that the cable ISP usually has is with existing cables running from the pole to your building. Either they're simply old, damaged by weather and corrosion, or the squirrels have chewed through them. In my area the local cable ISP instructs their technicians to replace existing cables "if in doubt" and to then test them with a digital meter. In the past they wouldn't do this, and the customers would complain about bad connections. Resulting in the ISP having to pay the technician for a 2nd visit. Therefore now they just take care of it on the first visit. They've also switched to cables that have a different outer skin which the squirrels don't find as tasty.

C.) In larger urban centers both telcos and cable providers have installed fibre optic cables as a network backbone in order to provider more stable connections, and to also allow for far, far more customer connections. 1. In the case of the telcos it's a big improvement. If the fibre cables actually make it to a control box close to your location, then you usually won't have lower bandwidth due to the 4km limitation. That's called FTTC and it usually suffices. Most people don't really need to have fibre optic cables running right up to their homes. Certain businesses might need this. But this might change as more 4k programming becomes available either via digital TV or streaming services. 2. Cable ISPs have only marginally increased their line stability as it was already very good before. The biggest benefit for them is increased bandwidth. Where I live we can get up to 940Mbps via cable Internet. This is accomplished with fibre up to the pole, and coax cable to the home. But eventually the cable ISP will also offer more fibre to the home/business when 4k services become more standardized.

D.) The presenter in the video states that DSL is usually cheaper than cable Internet. Well, where I live it's more the opposite. You tend to get less bang for the buck with DSL, whether it's basic copper or supported by fibre. And the biggest telco here in Canada (Bell) are professional rip-off artists.



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Mr. Yan Lucena

This guy has done more for me than my professors

Game Asylum

Geez....

Woxineau Crows

lol that tells me everything about your inteligence and good luck in life son. hehehe

Kara

Well a degree is also about researching for yourself snd being independent of the professors. I guess you get a pass then 👍:)

Its Professor snape to you

Lmao damn

Lennon McLean

@Sumita Singh just because two YouTube channels cover the same topic doesn’t mean they copied

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the905dblockcrew

This video should be shown by every ISP to its customers before they sell you anything. Your way of explaining the technology and details of the equipment is so easy to understand. You gave actual facts and explained how the bandwidth and connections different types of internet can have pros or cons. Best video I’ve ever watched when I’m trying to understand something. Amazing job

abc defg

A little bit of suppliment to the video for those who want to follow a path in networking.Almost all ISPs in the world actually use fiber up to their POP (point of presence). This video is mainly discussing about the „last mile” segment of the network, so dont make the mistake of thinking that your DSL/Cable is going all the way to the ISP hundreds of miles away. For DSL the terminator is the DSLAM, for cable it is the CMTS and for fiber mostly OLT. Thats why these networks are called hybrids. With this out of the way, another thing to remember is the fact that nowadays the transport medium (coax/ethernet/twisted copper (phone), fiber and so on) are no longer relevant for the types of services it can support. Phone lines, television and internet access can all run on the same line. Another thing to keep in mind (especially if you want to get network certified) is the fact that the end device nomenclature can get very confusing (mainly just to make cosumers understand them a bit). A typical modem is actually much more than that, inside it there is an actual modem which „translates” signal ,a router behind it (which is internally connected) and behind that router „port” a switch for the lan and a „port” for a wireless access point).

Jordan Bentley

You make it so easy to just passively absorb this information, I feel like so many cracks in my knowledge are being filled in just binge watching your videos

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