How do you investigate the proper value of "Maximum Transmit Power"?

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  • Updated 11 months ago
Hi there,

I have a question about "Maximum Transmit Power".

HiveManager NG has values from 10 to 20, but the impact is hard to understand.
How do you investigate the proper value of "Maximum Transmit Power"?

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Wataru Yamamoto

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Posted 12 months ago

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Photo of Carsten Buchenau

Carsten Buchenau, Champ

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You are asking for the pinnacle of Wifi deployments :-)

There is lots of information about this in here already, please just search a bit more.... very briefly, a few hints:

Impact: If the power is too high, you are likely to have interference with other APs on the same channel. You will also run into the "hidden node" problem. And: You will have clients being able to see this signal (and connect), although they are in proximity of a much better radio -> Not good

Some rules of thumb:
- Ideally all your radios should transmit with the same power
- Never go over 15dB, your clients cannot send back with more than 15dB anyway
- On 2.4 in a high-density deployment we normally never use more than 10 or 11dB
- Set all your radios' power on auto and the max inside the radio profile on, say 15. Come back after a day and see where you are (make sure the channel distribution is good, too). If they are all on 15 - leave it. If they are between 10 and 15, well, try again with, say, 12. Your goal here is to find the max value that works for all radios, with automatic adjustments of maybe 1, maximum 2 dB lower (as exception)

A proper site-survey with tools like Ekahau would help, of course, too :-)