Estimated Capacity very low on AP R710

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  • Updated 2 years ago
Hiya All :)

I have a big problem into a building here, with the WiFi. 

Actually users complain about speed of APs, so what I already did :

- Did a complet site survey with Ekahau Site Survey
- Move/remove a lot of APs for remove Overlapping and get a good strengh of signal
- Remove the 2.4 Ghz, like that users can connect only with 5 Ghz. 

Unfortunetly, the last step was a disaster... users complain more than before. 

Specialy some girls who are on a specific room. When I see the information of the concerned AP, OMM it's not normal at all. 



The estimated Capacity is very low and I dont know what's wrong and how I can solve the problem.

If anyone have an idea ?

Thanks a lot :)

JS.
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Jonathan SALVEMINI

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Posted 2 years ago

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Ahamed A

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Hi JS,

I checked the APs neighbour list and I see the overlap has come pretty less to 17 db and so. I am not sure how far the nearby APs are to Rolle -mo Rc access point.

I can also see 4,5 and 9 db which are apparently very less. Please make sure that 5 Ghz have shorter wavelength and they do not transverse through thick concrete walls. 

I would suggest to enable 2.4 Ghz first so that clients connects and then find the reason for low throughput. 

Check the throughput or speed using speedflex on both 2.4 and 5 ghz individually. Simultaneously check the wired speed by connecting a laptop to the switch.

By downloading the support file from the AP, check the phy errors and see if interfernce is not causing this.

If it is an issue with interference, try manual channels and see if that works.

Hope this helps.

Regards,
Ahamed.
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Jonathan SALVEMINI

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Hello Ahamed,

Thanks a lot for your reply.

I dont understand this sentence : 

I can also see 4,5 and 9 db which are apparently very less. Please make sure that 5 Ghz have shorter wavelength and they do not transverse through thick concrete walls. 

I am going to enable 2.4 Ghz for this moment, as you suggest.

What do you mean by using speedflex on both 2.4 and 5 ghz individually ?

Yes a second test will be the testinf of the wired. 

I am novice on that kind of product, that's why my question are a little bit stupid I guess, and I would like to apologize for that.

Thanks again Ahamed :)

Regards,
JS.
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Ahamed A

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Hi JS,

I meant to say 4 db, 5 db and 9 db in neighbor AP list. The APs are overlappiing with very less overlap. But then these are using 5 Ghz. 

Speedflex is nothing but a ruckus propreitary tool to test the speed. 
You can find the speedflex on the monitor >> access point page. You can also go to clients and check the speed using speed flex as shown below.



Speedflex is also available in app store for iOS and android devices. 

Hope this helps. 
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Matt

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It's best to confirm your wired layer is performing as a start.
Run a SpeedFlex to all your APs to confirm they're running gigabit speeds and that there isn't a backhaul issue.
Run a 10-15 second ping test from a machine at your core switch/AP switch to all AP's to ensure latency is good and there is no packet loss to APs.

Consider dropping your 5GHz from 80MHz channels down to 40MHz channels.

Walk around with a client laptop, one connected at 2.4GHz and one at 5GHz and run a ping check to test the latency in trouble areas.
Consider spectrum analysis in the trouble areas.
(Edited)
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Jonathan SALVEMINI

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Hello all :)

Well, this is the result of speedflex on an AP in that building (all results of the building are less or more the same)



Can someone explain to me what is this kind of test ? It's beetween the ZD to the AP, and then ?

Tomorrow I am going to test all my wired by your test Matt.

Could you also explain the signification of dropping the 5Ghz from 80MHz to 40MHz ?

Thanks again guys for your help,

Cheers,
JS.
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Robert Lowe

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OK I would suggest you go back to basics on this one. Cut the channel width back to 20MHz from the default 80 and then scan the unii 1 channels for availability and manually assign this channel on this AP and then test again. If the client devices near the AP don't support channel 112 then they won't hear the AP and will connect to another with most likey low quality signal in the area they are based.

Could you also advise what version of software you are running on the controller.
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Jonathan SALVEMINI

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This is the controller version : 9.12.0.0 build 336

What do you mean by "scan the unii 1 channels for availability" ?

Thank you,

JS.
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Robert Lowe

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Go to the location where the particular AP services and do another passive survey with Ekahau. Check the AP's auidiable in this area and see if any AP in the UNII 1 range (Ch 36-48) can be heard at a level greater than -85dbm. if not then set your AP to which ever of these channels is free in that area.