### CompTIA Network+

Course
Time
31 hours 29 minutes
Difficulty
Beginner
CEU/CPE
30

### Video Description

Wireless Standards: Frequencies (part 2) - Channels This lesson covers channels which are basically different decimal points on a frequency band. Channels allow us to have different access points even though devices are communicating on the same frequency. There are 14 channels in the USA and we have access to 1-11; while the rest of for military and government access. This lesson also discusses how to set up channels so interference doesn't occur.

### Video Transcription

00:04
Now we know what our frequency bands are 2.4 or five gigahertz. We know why they're referred to as 2.4 and five gigahertz and what a gigahertz is the measure of cycles per second over a point.
00:15
And we know what a frequency is.
00:18
Now let's take a look at our channels now. We talked a little bit about channels just just a second ago, but channels are essentially additional decimal points on our frequency band, so it's slightly modifying the way that that frequency functions
00:36
when we're changing our channel.
00:39
The good thing about our channels, however, allow us to have different wireless access points in the same area that don't cause interference with each other, even though they're talking on the same frequency
00:50
because they're talking well. They're talking on the same frequency band. There's talking on slightly different channels so their radio waves aren't aren't aren't encountering each other. They aren't causing interference because they're on different channels
01:03
now are 2.4 gigahertz. Frequency is goingto have 14 channels available to us are 14 channels available to us
01:12
scientifically speaking, but only 11 channels in the United States available to us
01:19
legally speaking
01:22
our devices in the United States. We could only use channels one through 11 because channels 14 channel 14 is you utilized by some military systems and as well as we're gonna mention here, we need a We want a two channel buffer
01:38
between us and the next channel being used because we overlap a little bit. Our channels are going to our channel. They're gonna cross over a little bit because they're going to utilize
01:48
Maur. They're gonna utilize a little bit of extra spectrum.
01:51
So we can't. We aren't just using just Channel one just channel to just Channel three were essentially utilizing channels 123 or channels
02:01
45678
02:02
So if we were to utilize channel 13 our frequency would bleed a little bit into that Channel 14 which is used by Middle Merrill military purposes. So we don't use channel. We don't use channels
02:15
12 13 or 14 in the United States. We can only channels one through 11 if we have our channels. One through 11.
02:23
One,
02:24
23456789 10 11 United States. So we can't use
02:34
12
02:35
13 or 14 and we need to channels of separation between each channel that we choose and we can go night and we can use negative separation.
02:44
So if we're on Channel one,
02:46
we can set the Channel one that's going to cover Spectrum of 23 and then back into our negatives.
02:53
So our next channel, we we need to go 12 and we can use Channel six as another common channel,
03:00
and that would cover 45678
03:04
So them bump, too, and we can use Channel 11
03:07
and that's gonna bleed over into nine and 10 and 11 and 12. But that's okay, are 12 and 13 but that's OK that it bleeds into 12 and 13.
03:15
There's no the regulations in the United States that dictate which channels that we can use.
03:23
Which 11 channels we can use state that we can't set our Channel two channels 12 13 or 14. It's okay if we're on Channel 11 and that bleeds over a little bit into 12 and 13 or 14.
03:37
So when we're talking about our 2.4 gigahertz frequency band, you're going to very commonly hear that what channel were set on, referred to as channels one,
03:49
six
03:51
or 11.
03:52
We thought we also talked about we talked about this more when we were in our module of setting up how to set up different wireless access points, setting up and figuring wireless access points. But we will just mention it again because we are in their wireless module
04:08
that when we're setting up art, our wireless access points, typically our wireless access points will go out, and they will try to auto auto, determine what other wireless access points are in the area or what other channels might currently be. Our might currently be used
04:25
and they'll go out and detect, and they're going to want to try and news channels one,
04:30
six or 11 in order to keep things standardized.
04:34
Now we can manually change what channel were set on to channel tow anything through one through 11. But it's very heavily recommended that we stick to either channels 16 or 11 because it would be better for us to be overlapping someone. So if there was some interference being caused by, say, say, we have four
04:55
neighbors, each with wireless access point,
04:58
so
04:59
there's there's five people competing for there's five people competing for frequency space. There's only three main channels 16 and 11 that we can use. Well, then you may say, Well, hey, I'll just put myself over to Channel four, then I only have a little bit of overlap with my two neighbours. Well,
05:15
that we don't want that. We don't want that. We would rather be directly over someone else's channel.
05:21
So we would rather set ourselves up on the same channel someone else is on,
05:26
then be overlapping two different channels. Think of it as if you're at a party and you're having a conversation.
05:34
Um, if you're standing in the middle of ever standing in the middle of the large area, you're having a conversation with someone, and then so you're in the middle of
05:44
you're in the middle and you're having a conversation. But there are two conversations going on next to you. There's a conversation going on to your left, and there's a second conversation going on to your right
05:54
and you're trying to talk to your friend. But there are two other conversations going on at the same time. Then it's gonna be harder for you to talk because you're gonna be here in the little bits of those conversations going on. That's what happened with our wireless. They're here and little bits of both of these other conversations going on.
06:10
But if our wireless knows it's on the same channel,
06:13
it's directly on someone else's channel. It can consort of Take Turns with that other wireless access point. So it would be like if you just said, Hey, look, I can't I can't deal with standing here and having to other conversations going on next to me So why don't we just move over closer to this other conversation and then just sort of
06:31
join in with them and say, Hey,
06:33
why don't we all take turns talking? So I'll take turns talking to my friend, and then when I'm taking a break, you can talk to your friend and it makes it a little bit easier. Our conversations might go slower, but it's easier to understand, and we'll have less interference.
06:46
So if we have to set up so that we have interference with another channel, we would rather be directly on top of someone someone else's channel than crossing between
07:00
two channels or overlapping a channel. So remember that
07:03
so long. Story short, we want to set up on channels one,
07:08
six
07:09
or 11.
07:11
This is gonna be for our 2.42 point four gigahertz frequency band.
07:15
Now, each of these channels correspond with again additional decimal points. We won't go into all of the additional decimal points, but what we will just say is that each of these spreads
07:28
covers 22 22 megahertz of space.
07:32
Each of these spreads cover 22 megahertz of frequency space that we're talking in,
07:39
and our main channels 16 and 11 are going to be 2.4.
07:46
We're gonna have 2.412
07:50
as Channel one,
07:53
2.436 as Channel six
07:57
and 2.462
08:01
as Channel
08:03
11.
08:05
So that's where are different. That's where different channels or set up. That's why we have different channels on our 2.4 gigahertz frequency band. But all we really need to know for that is that it has Maur interference. It has a typically a longer range and that
08:22
in the United States we have 11 channels that we can use
08:26
and the next that we have our five Giga Hertz frequency band now are five Giga Hertz frequency band we talked about. We can send out more data per radio. We have a shorter range and less interference on. We also have more channels that we can set upon now are two points are five Giga Hertz Frequency Band
08:43
has has a lot more channels that we're gonna set up on, so we're not gonna draw him all out like we did for 2.4 gigahertz Frequency band,
08:48
however, just know that are five Giga Hertz frequency band.
08:54
We do have channels available to us, but
08:56
there are additional channels that may be available to our business. If we decide to have a professional set up our five Giga Hertz frequency device, there are additional channels that can be used,
09:09
but they need to be set up professional be professionally because they may interfere with certain systems that utilize radar. So we need to make sure that we're having those having those particular channels professionally set up. But there are there are out of the box devices. There are out of the box channels
09:28
that we can use with five Giga Hertz frequency devices

### CompTIA Network+

This CompTIA Network+ certification training provides you with the knowledge to begin a career in network administration. This online course teaches the skills needed to create, configure, manage, and troubleshoot wireless and wired networks.

### Instructed By

Anthony Harris
Senior Systems Engineer at ZenPoint Solutions
Instructor