Time
8 hours 39 minutes
Difficulty
Beginner
CEU/CPE
9

Video Transcription

00:00
this is less than 13.4 wireless standards. We're gonna look at wireless networking and protocols that's going to get started.
00:07
Our objective in this. Listen, Like I said, we're gonna look at some wearing a standard. Somewhere in this protocols, we're gonna look at the $802.11 A. You know, two down 11 b
00:16
you know to 11 g and you know to 11 in and finish off with, you know, 2 11 a. C. So let's go and get just jump right in to get started.
00:25
Wireless networking is under the 80 to doubt 11 Standard, managed by the IEEE Land Man Standards Committee. The IEEE A. No. To
00:34
over the years, there's been many updates to the wireless standards, as you'll see here as we progress from the earlier standards and come to where we're at today.
00:43
There's a lot of WiFi devices that's on the market today, and you may see a WiFi icon or a WiFi logo on that box of those devices. To get that compatibility have to go through an inter operability, testing to brand the WiFi trademark to get that trademark. So
01:00
their standards and testings that they have to do to be so certified
01:04
for wireless standards. So let's go through the wireless standards and you'll see where we started from and where we were at today.
01:12
802.11 a was introduced in October of 1999.
01:17
It's throughput is 54 megabits. Second, it's the throughput on the speeds that it can achieve
01:23
has a smaller coverage rain than 802 down 11 B, which will talk about here in a moment. And this operated on the five gigahertz range on and also operates on other frequencies with special licensing. When NATO to down 11 a first came out. It wasn't really a
01:40
an overall success due to some limited for device capabilities.
01:46
Devices at that time were not rated highly for the five giver her spectrum so therefore, it was a not very popular spectrum at that time.
01:56
Later on, we came up to the 802 down 11 B, and that was introduced in October of 1999 as well. It was 11 minutes loving megabits per second. Is this throughput now? Had the better range than NATO to not 11 a meaning it could propagate further longer range coverage
02:14
operates up again at the range of 2.4 gigahertz
02:16
frequency issues with the attitude 11. 11 be with this frequency, the 2.4 gigahertz range. There was a lot of other devices that used that same frequency and still do today. Baby monitors, microwaves, Cordless phones. A lot of devices used the 2.4 gigahertz, so they cause a lot of interference.
02:37
When you look at a
02:38
2.4 gigahertz device, you could see a lot of devices in the near field when you're looking to find the S S I. D. For that access point on that device
02:49
so problematic for the 2.4 gigahertz ranges. Other devices using the same frequency,
02:54
um, June of 2003. There was an upgrade made to the 18 to 11. Be ah, you know to 11 g. It came out and operated in 2.4 as well, so this was a different frequency. Different range. Within the 2.4 gigahertz, it was backwards compatible to the $802. 11 b.
03:14
But it had the same conflicts. Asked the 11 802 11 b as well
03:21
later on. As of June of 2003 we came out with the ADA to 11 g. This was an upgrade to the you know to 11 B
03:30
802 11 g operated in 2.4 gigahertz. It was backwards compatible, but yet it still had the same wireless conflicts. Asked Adle to 11 B as well.
03:43
Then we came out with a tow to 11 Ian. Now this was an update to a no to his 11 A, B and G.
03:50
This was introduced in October of 2009 and it operates at five gigahertz, or 2.4 gigahertz. So both of those frequencies that operates on the 40 channel 40 megahertz channel with more throughput Theoretical of 600 megabits theoretical speeds.
04:09
400 megahertz mold with foreign Tana since Han it's configured
04:13
now. 802 11. Ian also introduced a technology card. My MO in my bowl stands for multiple end, multiple out transmit. It transmits with multiple antennas and receives multiple signals and transmit multiple signals as well.
04:30
Because of them, the multiple in multiple out it was able to achieve
04:34
Maur and higher throughput speeds Onda again. This was that five gigahertz and 2.4 gigahertz. So there was definitely a triumph over the frequency problems that the earlier A, B and G experienced.
04:50
And as of today we have the 802 11 a. C, and this was approved as of January 2014. It operates in a five to give the Hertz spectrum as well, and it's up to 160 megahertz channel bandwidth, which increase the channel bonding the sorts of larger band with the usage in this frequency.
05:11
Also, signal modulation was changed as well. Faster data speeds was able to achieve faster data speeds. Also, it has eight multi user My mo streams, twice as many as the Edo to 11 in So the theoretical speeds here are nearly seven gigabits a second.
05:30
So we have the wireless standards summary. And he's how the summaries of all those standards that we just spoke of the Edo to 11 a frequencies again five gigahertz know my MO. At that time, maximum throat theoretical throughput was 54 megabits maximum total throughput. 54 megabits
05:47
that we went up to the 0 to 11 B
05:49
2.4 gigahertz. No mind, no At that time, 11 megabits was the maximum through their radical throughput, and the total throughput was 11 megabits as well.
06:00
You know, to 11 G 2.4 gigahertz know my mo 54 megabits. A second and total was 54 megabits as well
06:11
that we stepped up to the 802 11 in that was five finger hurts as well as 2.4 gigahertz streams. There was four. My most dreams 150 megabits a second, a big jump there, and theoretical total was 600 megabits.
06:27
802 11 a sees we're at today five gigahertz channel that it operates on.
06:31
And it was eight multi user and my most streams. Theoretical throughput is 866.7 megabits and a total of 6.8 gigabits, nearly seven gigabits. So there you have it. That's our wireless standards, where we started out on where we ended up today.
06:50
So in today's lesson, what we did is we talked about the wireless standards and we started from the 8 to 11 day and walked away to the president Current time of the 802 11 a sea. So now you know, as far as the wireless standards and where we're at today. So that is the end of this lesson, and we will see you in the next lesson.

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