topic Re: wireless interference in Wireless

wireless interference

Pravin Pillai — Sun, 04 Jul 2021 07:37:08 GMT

Hi,

I have a 5508 WLC installed in an area of 1500 sq m. There are LAP which is active in that area. The users are complaining of weak signals in the area.

There is some iron construction going on in that area.

Would like to know whether that affects AP signal strength?

wireless interference

Leo Laohoo — Fri, 09 Aug 2013 03:43:59 GMT

Depends on how dense is the iron works.

Download inSSIDer and check out the wireless signal/propagation for yourself.

wireless interference

Pravin Pillai — Fri, 09 Aug 2013 04:10:33 GMT

The site is at remote location. I have asked the local to provide to S/N ratio

Need to know what is the threshold level for s/N ratio

wireless interference

Saurav Lodh — Fri, 09 Aug 2013 05:35:58 GMT

This document explains the possible causes of poor signal strength , and troubleshooting measures

http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a00800948cb.shtml

Re: wireless interference

Scott Fella — Fri, 09 Aug 2013 11:16:28 GMT

Well... If you have some sort of construction and they have equipment that naught cause interference and it might be blocking signal, then that's your issue. If it started when the construction began, then you have a good idea of why users are complaining. Unless you go out there and test, you will never know.

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wireless interference

Pravin Pillai — Fri, 09 Aug 2013 11:35:45 GMT

Could be due to power signal setting? The power the client is getting might be low?

How can i check the power which is allocated to client via some command on WLC

Re: wireless interference

Scott Fella — Fri, 09 Aug 2013 11:39:46 GMT

Look at the GUI under the wireless tab. On the left side is 802.11bgn or 802.11an. That will show you what power level the ap is using. That's what you need to look at. Again, your troubleshooting something that really requires a site visit. Making changes to something that was working can affect the rf later. Power Level of 1 is the highest power setting for an ap. so you can manually set that if you want.

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wireless interference

Pravin Pillai — Fri, 09 Aug 2013 11:50:00 GMT

I cant see the power setting.. I can see noise profile and interference profile etc.

For me to go to the site is not feasible.

Re: wireless interference

Scott Fella — Fri, 09 Aug 2013 11:53:12 GMT

You can see the power setting for the access points? It's in the GUI.

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wireless interference

Pravin Pillai — Fri, 09 Aug 2013 11:58:32 GMT

AP Name

Radio Slot#

Base Radio MAC

Sub Band

Operational Status

Load Profile

Radio Role

Noise Profile

Interference Profile

Coverage Profile

CleanAir Admin Status

CleanAir Oper

only these ar visible

Re: wireless interference

Scott Fella — Fri, 09 Aug 2013 12:01:26 GMT

You have AP's up? In the cli can you IAS a show advanced 802.11b summary and ski do one for 802.11a

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wireless interference

Pravin Pillai — Fri, 09 Aug 2013 12:18:05 GMT

Thanks got it. The Tx powr is as low as 2 dbm and -1 dbm for some LAP.

Is tht the cause?

Re: wireless interference

Scott Fella — Fri, 09 Aug 2013 12:20:11 GMT

Yes that is low. You will want to set the min tx power to say 14 dbm.

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Re: wireless interference

Pravin Pillai — Sat, 10 Aug 2013 12:45:46 GMT

thanks so much for the help

I wanna ask the power setting we apply to LAP is that same as Tx power or is there some other setting//

Is there any config command to increase or level the Tx power to 14 dbm frm as low as -1 dbm?

Re: wireless interference

Scott Fella — Sat, 10 Aug 2013 13:31:06 GMT

You can set the max TX and the min tx for each band. Here is where you can set it. You want the min around 11 dbm to start with.

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wireless interference

Scott Fella — Sat, 10 Aug 2013 13:35:19 GMT

Rmember that this is in dBm and that is the value you need to enter.

Thanks,

Scott

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Re: wireless interference

Pravin Pillai — Thu, 15 Aug 2013 14:01:17 GMT

Hi ,

I have not changed the min and max Tx power since RRM algo determines it. but for testing I changed the problematic LAP power to max TX power which is 1.

The client report that the client switches between different LAP even when they are in perimeter of coverage area.