Time
31 hours 29 minutes
Difficulty
Beginner
CEU/CPE
30

Video Description

DSL Digital Line Subscriber This lesson covers Digital Line Subscriber (DSL) which is one of the most common connections for wide area networks. DSL sends data at high frequencies over telephone lines. There are a few types of DSL: SDSL: Symmetric DSL ADSL: Asymetric DSL VDLS: Very high bit rate DSL

Video Transcription

00:04
next up, we have the SL Now, D s l is going to be one of the most common connections that you're going to see for wide area networks. Gonna be our most common Internet connectivity and D s l stands for digital lines. Subscriber. Now D S L sins data again on the same lines over telephone.
00:23
But D s l is going to send data at higher frequencies,
00:27
so because it's sending at higher frequencies, it's able to send it. It's able to send it at a better rate, were able to send more data and were able to have less interference from other data or other other signals. Such a czar. Telephone signals on that telephone line. So R d s l is gonna be a much ah, much better standard to go. Go and use
00:46
now. R D s L. We have three subtypes. We have s d s l
00:51
A D S l N v g s L
00:53
S d s l stands for symmetric d s l. And the reason we call it symmetric BSL is because the types of devices that we that our Internet service provider uses on our on our d S L network are going to be symmetric up speeds and down speeds. So if we are uploaded a file to a server online
01:12
or for downloading a file from a server online,
01:15
we're going to be running at 1.6 megabits per second.
01:19
So it's symmetric are up, speeds are upload speeds and our download speeds are symmetric.
01:27
And then we have a BSL. We have asymmetric de eso now asymmetric D s. L, depending on our situation may actually be better for us. We are running at eight megabits per second down,
01:41
but we are only running at 1.544 megabits per second up. So we've stolen a little bit of speed from our upload speed
01:49
and given it to our download speed. Now, why might this be better? We're no longer. We're no longer symmetric. Well, if you're navigating the Internet as just a standard home user, chances are you are downloading more content than you're uploading. You're taking more from the Internet than you're really giving.
02:07
But when you're downloading, you are doing everything from stream movies to downloading files, too.
02:14
Pulling that work file down from your pulling from that work file down from your from your work computer. Um, we do a lot more. We do a lot more pulling on the Internet than we do pushing. We may upload the occasional picture to Facebook or E maiI, upload the occasional file and to email it to our friends. But
02:32
a lot of times these things that were up loading, at least for the standard home user,
02:37
are going to be smaller in size than the things that we download. We're not gonna be. Chances are we're not going to be uploading a two hour long movie to a two hour long movie to Netflix. We're not sending them our two hour long home movie, but we are streaming and we're downloading
02:54
that two hour long movie from Netflix.
02:58
So we wanna have faster downstream rates than we do upstream rates. So are downstream are download. Speed is going to be a max of eight megabits per second on a D. S. L. With a maximum up speed of 1.544 megabits per second up. So we see we lost some in our up speed,
03:17
but we gained a lot in our download speed.
03:20
So for many home users. If between S. D s L and A. D S L A D s l is the way to go So you may hear some people saying, Oh, our service offers the same upload speeds that does download speeds. Well, you may want to say, Well, what are your upload and download speeds versus the service that offers
03:38
better download speeds versus upload speeds?
03:40
Because chances are I'm not uploading unless you're content provider, which is that's a different case entirely. But chances are I'm not uploading
03:49
nearly as much as I'm downloading.
03:53
And then lastly, we have V D S L V D s l eyes gonna be our best of best of all, the world's, um,
04:00
is going to stand for very high bit rate D s l are very high bit rate D s l is going to be 52 megabits per second down and 12 megabits per second up. So it's still an asymmetric. It's still in asymmetric rate, but we don't call it a symmetric BSL because
04:19
even our upload speed on V. D. S L blows A. D s l's upload download speed out of the water.
04:27
So RV DSLR very high bit rate D s l remember is going to be 52 megabits per second down and 12 megabits per second.
04:36
So, uh, these this is a recap. These are all going to be our telephone line Connections pots P s tiene dial up 56 kilobits per second
04:48
up and down I s d N 128 kilobytes per 2nd 64 kilobytes per data channel Up and down
04:57
D S L we have s D s l 1.6 megabits per second up and down A D s l eight megabits per second, down 1.544 up
05:09
and V D s L 52 megabits per second, down 12 megabits per second.

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