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Effects on transmit power on access points

carl_townshend
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Hi All

Can anyone tell me the benefits of increasing TX power on an access point? does it allow the signal to go further? or faster etc ?

 

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Accepted Solutions

Transmit power is directly translated to energy of the wave, so higher the transmit power, you will see wave goes further. This sounds like increase Tx power is a good idea.

 

Actually it is not a good idea though. You have to always remember other end is client devices (phones, tablet, pc) which usually does not have that much Tx power (due to handheld devices and battery life time is so important)

 

As you can see below, if AP Tx power is too high, you will get a good signal strength for client, then client try to transmit higher data rate. But as clients has low Tx power, AP cannot hear it well. So communication problem occurs. So you have to balance AP Tx power to match clients to get better results.

 

AP-CLIENT-Power.JPG

As example, your AP may be capable of Tx 23dBm, but phone 10-14dBm, in that case better to limit your AP Tx power 8-17dBm range rather increase it to max 20 or 23dBm

 

AP-CLIENT-Power2.JPG

Pls check this Ciscolive presentation for better understanding above concepts.

 

HTH

Rasika

*** Pls rate all useful responses ***

 

 

View solution in original post

5 Replies 5

Ryo Kato
Level 1
Level 1

It changes the range, high power to run big cells (coverage area), low power for many small cells in a high density environment. Beside that, you can lower the transmit power in 2.4Ghz and help chose the clients the 5GHz cell with stronger signal.

Transmit power is directly translated to energy of the wave, so higher the transmit power, you will see wave goes further. This sounds like increase Tx power is a good idea.

 

Actually it is not a good idea though. You have to always remember other end is client devices (phones, tablet, pc) which usually does not have that much Tx power (due to handheld devices and battery life time is so important)

 

As you can see below, if AP Tx power is too high, you will get a good signal strength for client, then client try to transmit higher data rate. But as clients has low Tx power, AP cannot hear it well. So communication problem occurs. So you have to balance AP Tx power to match clients to get better results.

 

AP-CLIENT-Power.JPG

As example, your AP may be capable of Tx 23dBm, but phone 10-14dBm, in that case better to limit your AP Tx power 8-17dBm range rather increase it to max 20 or 23dBm

 

AP-CLIENT-Power2.JPG

Pls check this Ciscolive presentation for better understanding above concepts.

 

HTH

Rasika

*** Pls rate all useful responses ***

 

 

Hello Rasika, would you have the Cisco Live presentation that you mentioned above? Page was not found.

If you still have it, could you kindly send it to me, if possible? luiggimoreira@gmail.com

Thank you so much!

 

 - @luiggi-moreira :   https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2024/pdf/BRKEWN-2926.pdf

   M.



-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
    When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Thank you so much, @marce1000 ! I appreciate.

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