topic Yes that's true. on the other in Wireless

choosing power

wyfy-2015 — Mon, 05 Jul 2021 12:02:40 GMT

Hi,

When building a high density deplyment , what is the right power to choose for 2.4 and 5 ghz

Some site survey tool says for 2,4 ghz choose 3dBm

and for 5 ghz choose 16dBm

What is the best practice from cisco

Most important thing is how

Rasika Nayanajith — Thu, 12 May 2016 20:04:46 GMT

Most important thing is how you do channel re-use in these sort of environment. It is best if you could avoid any channel reuse (ie 3 CH for 2.4GHz and max 24 CH in 5GHz with 20Mz). If you have to reuse channels, then you have to reduce RF foot print of each AP by choosing right antenna types.(directional)

Therefore power level should be based on how you use these frequencies. If you re-use same channel for more than 1 AP then you have to control power in order to reduce CCI (Co Channel Interference)

Typically 8 -14dBm for 5GHz and 0-7dBm for 2.4GHz common

Again end of the day depend on your setup you have to decide power level of APs .

HTH

Rasika

*** Pls rate all useful responses ***

Hi

wyfy-2015 — Fri, 13 May 2016 05:00:42 GMT

"Again end of the day depend on your setup you have to decide power level of APs "

Can you give one example setup

Thanks

If you have already deployed

Rasika Nayanajith — Fri, 13 May 2016 07:48:06 GMT

If you have already deployed this, then share how your design looks like (ie how many AP & what channels are they in). So we can give some advice.

Even if it is propose design, share that info, so we can give some suggestions.

What site survey tools did you use ? If you have Ekahau product, you can model these & see how those power changes impacting

HTH

Rasika

Hi,

wyfy-2015 — Fri, 13 May 2016 10:19:55 GMT

Hi,

Thank you rasika for your help .

We have around 250 AP's , channels are Channels are UNII-1 and UNII-2 UNII-3

But i could not see DCA assigned UNII- 3 channels ? .

" What site survey tools did you use ? If you have Ekahau product, you can model these & see how those power changes impacting "

If i model in ekahau by adjusting power , as long as i am using auto tpc and dca

how do i incorporate in my deployment ?

In 240 feet i have 4 AP'S deployed , Almost every 60 feet one AP.

Thanks

Hi,

wyfy-2015 — Wed, 18 May 2016 04:14:00 GMT

Hi,

The information provided is enough ?

Thanks

In my network I have set up

Rasika Nayanajith — Thu, 19 May 2016 20:05:41 GMT

In my network I have set up TPC min/max for 5GHz as 8dBm/17dBm.

In 2.4GHz band, i would reduce this further 3dBm - 11dBm as singal goes long when frequency is low.

HTH

Rasika

Hi,

wyfy-2015 — Thu, 19 May 2016 20:56:14 GMT

Hi Rasika

I have attached the design , can i go with it ?

Thanks

Hi,

wyfy-2015 — Thu, 19 May 2016 21:01:34 GMT

Hi,

It would be great if you provide how did you reach this value ? .

And moreover that in my proposed design there is only one value for 5 ghz and 2.4 Ghz (No maximum or minimum specified )

Thanks

Hi,

Rasika Nayanajith — Thu, 19 May 2016 23:26:22 GMT

Hi,

These are the setting I have done on WLC (under Wireless -> 802.11a/n/ac ->RRM -> TPC)

Then leave RRM to decide power level dynamically within this range.

In survey tool (Ekahau) use 7 or 10dBm as 5GHz AP radio power & work it out number of APs required (also considering bandwidth/capacity requirement)

HTH

Rasika

Hi,

wyfy-2015 — Mon, 23 May 2016 12:01:29 GMT

Hi,

Maximum Power Level Assignment(-10 to 28 dBm) ==== 28
Minimum Power Level Assignment(-10 to 30 dBm) ==== -10
most of the AP shows power level is 1

In the above scenario can I assume that all the AP'S which shows power level '1' is pushing maximum 30 dBM

Thanks

No, Power level 1 specific to

Rasika Nayanajith — Mon, 23 May 2016 20:37:13 GMT

No, Power level 1 specific to the AP model

On your WLC if you look "show advanced {802.11a|802.11b} txpower" output it will tells you what those power level are.

Typically it would be 20/23dBm & depend on the regulatory domain of AP belongs & what frequency it operates. See below example, even though AP operates in power level 1, it is on 15dBm as that is the max it allows to go.

AP Name Channel TxPower Allowed Power Levels 
-------------------- ---------- ------------- ------------

AP05-L2APT62 *(36,40) *1/5 (15 dBm) [15/12/9/6/3/3/3/3]
AP04-L3APT59 *(52,56) *1/5 (16 dBm) [16/13/10/7/4/4/4/4]
AP06-L3APT26 *(40,36) *1/5 (15 dBm) [15/12/9/6/3/3/3/3]

TPC max 30dBm means WLC allow AP to increase upto 30, if regulatory domain allows such a value.

HTH

Rasika

Hi Rasika ,

wyfy-2015 — Wed, 25 May 2016 04:12:13 GMT

Hi Rasika ,

show ap dot11 5ghz summary,show ap dot11 24ghz summary is not giving much details like show advanced {802.11a|802.11b} txpower .

Country power level maximum show 20 dBm

But the channel 36 Maximum transmit power level is 23 dBM

In that case What will happen ? . ( Country's maximum power level will not be override ?)

Thanks

Hi,

wyfy-2015 — Fri, 24 Jun 2016 00:10:31 GMT

Hi,

Let's say Supported Country Maximum Power is 20 dBm , Tpc value max is 11 dBm
and Channel 36 Max is 23 dBm
So at the end what will be the power value

Thanks

If you leave RRM to choose

Rasika Nayanajith — Fri, 24 Jun 2016 06:02:31 GMT

If you leave RRM to choose power level, then it will capped to 11dBm

HTH

Rasika

Hi,

wyfy-2015 — Sat, 25 Jun 2016 02:24:35 GMT

Hi,

It means EIRP is 11 dBm

Thanks

Hi Rasika,

wyfy-2015 — Mon, 27 Jun 2016 08:13:16 GMT

Hi Rasika,

By reducing the tpc max and min are we reducing the cell size

Thanks

Yes that's true. on the other

Rasika Nayanajith — Mon, 27 Jun 2016 08:34:15 GMT

Yes that's true. on the other hand having a large cell won't help at all. Everything determine by averaged client capability (typically 10-14dBm).

If you have AP transmit high power, client will hear it. But when client communicate back from a cell edge, AP won't hear it.

HTH

Rasika

Hi Rasika

wyfy-2015 — Mon, 27 Jun 2016 10:19:04 GMT

Hi Rasika

Reducing the cell size will reduce the coverage also ?

Thanks