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Occasional Contributor I
Posts: 6
Registered: ‎05-26-2014

2.4 GHz channel selection

[ Edited ]

Hi guys,

I had a look around the place, and tried to understand what is best to do.
The auto channel still may work great, but want to have a little more understanding of the challenge.


Ok, so we know that in 3 channel scenario we have 1 6 11.
Assuming that everyone is using 20Mh channels.

 

Now scenarios :

 

1) After a scan I have 2 APs on each non overlapping channel.
The signal seen by my AP are :
Channel 1 : -70 & -80
Channel 6 : -60 & -70
Channel 11 : -50 & -60

Is it safe to say that I'm better off selecting channel 1? Or does it not matter?
If it does matter, what will be the consequences?

 

2) Same scenario as above,
Channel 1 : -70 & -80
Channel 6 : -60 & -70
Channel 11 : -50 & -60
The only difference now is that I see an adjacent channel interference on channel 3.
It makes sense to choose channel 11 right?

 

3) Same again
Channel 1 : -70 & -80
Channel 6 : -60 & -70
Channel 11 : -50 & -60

Now I see someone using channel 4 and channel 8. Is it safe to assume that I will be better off using 1 or 11? Or will it matter if I can hear one stronger than another?

 

I'm just trying to figure out what is the order of things that you need to consider then choosing a channel.

 

Number of channel interference?
Number of adjacent channel interference?
The number of 5Mhz that are overlapping?
Signal strength of the nearby SSID and so on?

 

And I think all comes down to time when the channel is busy?

 


Hope this makes sense :)

Cheers,
A

Aruba
Posts: 1,290
Registered: ‎08-29-2007

Re: 2.4 GHz channel selection


 

I'm just trying to figure out what is the order of things that you need to consider then choosing a channel.

 

Number of channel interference?
Number of adjacent channel interference?
The number of 5Mhz that are overlapping?
Signal strength of the nearby SSID and so on?



All of these things can change over time.  You really are best off leaving auto-selection on and not worry about it.


If my post is helpful please give kudos, or mark as solved if it answers your post.

ACCP, ACMP, ACMX #294
mclarke@arubanetworks.com
Occasional Contributor I
Posts: 6
Registered: ‎05-26-2014

Re: 2.4 GHz channel selection

Oh yes, I do agree that in most cases the auto channel will be best.


I just try to understand the ins on how it works and what thake priority over another.
There should be a login.


Does it make any difference if cochannel interference happens on 5Mhz or 10Mhz?

Aruba
Posts: 1,290
Registered: ‎08-29-2007

Re: 2.4 GHz channel selection

These links might explain things better than me.

 

http://community.arubanetworks.com/t5/07-19-13-Expert-Day/What-are-the-basic-parameters-used-by-ARM-to-select-channel/m-p/87232/highlight/true#M186

 

http://community.arubanetworks.com/t5/Video/VIDEO-How-ARM-works-amp-how-to-manually-change-Power-amp-Channel/ta-p/144211


If my post is helpful please give kudos, or mark as solved if it answers your post.

ACCP, ACMP, ACMX #294
mclarke@arubanetworks.com
Occasional Contributor I
Posts: 6
Registered: ‎05-26-2014

Re: 2.4 GHz channel selection

Ah, great! thanks.

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