distance between AP 1815i and client wifi .

[Dhikra Marghli]

Hello

i want to know   how much distance between AP 1815i  and client wifi . 

Thanks 

[Dhikra Marghli]

i wait a reply

thanks

[Leo Laohoo]

[marce1000]

 - There's no fixed answer to that question ; it also depends on building structures (e.g.) and path obstacles (e.g.)

 M.

[JPavonM]

As @marce1000  said, it all depend on the walls and objects blocking signal, but also on the maximum transmission power on the device side (because all APs can transmit at maximum power but client cannot).

The only best way to grant that a device will be able to receive and transmit at a given distance, is to perform an active survey and test connectivity from different spots.

By the way, you can check Max TX Power settings for your adapter at FCC site https://fccid.io/ (i.e this is for Intel AX210 adapter where you can see that Max TX Power is limited to 23 dBm) 

[Rich R]

And Tx power may also be limited by the local Regulatory Domain and selected channel.

Refer to https://www.cisco.com/c/dam/en/us/products/collateral/wireless/access-points/sales-tool-c96-744090.pdf for links to the complete data for each regulatory domain and channel for each AP type.

[Scott Fella]

That is a question you should never ask.  What you should ask is what is the minimum client RSSI/SNR that I should be looking at.  This way you can survey the area to determine how many ap's you need and where they should be mounted for optimal performance.  You don't want someone to tell you 200' but you get -92dbm.  That doesn't help you.

[Dhikra Marghli]

Hello

i want to know  why band 5ghz covers short distance  and band 2.4 ghz covers long distance ?? 

I want to know  it depends on the band 5 ghz antenna??

i wait a reply from support expert wifi

Thanks 

[JPavonM]

This is just wave transmisssion physics and it is governed by Free Spase Path Loss (https://encyclopedia.pub/entry/31362#:~:text=The%20free%2Dspace%20path%20loss%20(FSPL)%20formula%20derives%20from,%CE%BB%204%20%CF%80%20d%20)%202).

This excellent article by a Wi-Fi colleague will help you a little bit to understand it with a real example (https://semfionetworks.com/blog/free-space-path-loss-diagrams/).

Transmission distance depend on 1) transmission energy, 2) how antenna focus that energy, and 3) receiver sesitivity, but 4) maximum transmitted energy (EIRP) is set to very specific values in all regions (https://wlan1nde.wordpress.com/2014/11/26/wlan-maximum-transmission-power-etsi/) You can try to know the RSSI of a signal on free space with the FSPL formula

[MHM Cisco World]

When wave frequency increases it wavelengths decrease 

So 5 ghz have rate data but less distance than 2.4ghz

Some AP can run both (dual antenna).

MHM