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power local settings on Cisco 1042

Does anyone know what dbm or mw each of the power local settings are? I see on a 1042 from -1 thru 20 and am assuming 20dBm is 100mW. Anyone know the others?

OM-ess-lab-WLAN1(config-if)#power local ?        
  <-1 - 20>  One of: -1 2 5 8 11 14 17 20
  maximum    Set power to allowed maximum

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power local settings on Cisco 1042

Hi there...

This blog post I did might help you a little.

http://www.my80211.com/cisco-wlc-labs/2009/10/30/what-you-need-to-know-about-tx-power-and-80211a-5ghz-on-a-ci.html

However, you are correct 20 dBm is 100mW. And it will get 1/2 each step down, thats why you see 17,14,11 etc ...

Make sense ...?

__________________________________________________________________________________________ "Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin ___________________________________________________________

power local settings on Cisco 1042

Piggy backing George here.

Keep in mind that 802.11n does change the power scheme a bit, as it accounts for two transmitters not just one, as legacy 5GHz/2.4GHz does.

And finally, the 1-5 are subjective.  1 does not mean 20dBm, it means max power for that band + channel combo.

At one point I had been pushing for Cisco to show the actual dBm with/instead of the 1-5 designator, but I'm not sure where that is at.

HTH,

Steve

----------------------------------------------------------------------------------------------------------

Please remember to rate helpful posts or to mark the question as answered so that it can be found later.

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
6 REPLIES

power local settings on Cisco 1042

Hi there...

This blog post I did might help you a little.

http://www.my80211.com/cisco-wlc-labs/2009/10/30/what-you-need-to-know-about-tx-power-and-80211a-5ghz-on-a-ci.html

However, you are correct 20 dBm is 100mW. And it will get 1/2 each step down, thats why you see 17,14,11 etc ...

Make sense ...?

__________________________________________________________________________________________ "Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin ___________________________________________________________
New Member

power local settings on Cisco 1042

Ya, makes sense. Each 3 db doubles is what I used to remember. I used to know how to calculate this stuff but it has been a while. Thanks

power local settings on Cisco 1042

Piggy backing George here.

Keep in mind that 802.11n does change the power scheme a bit, as it accounts for two transmitters not just one, as legacy 5GHz/2.4GHz does.

And finally, the 1-5 are subjective.  1 does not mean 20dBm, it means max power for that band + channel combo.

At one point I had been pushing for Cisco to show the actual dBm with/instead of the 1-5 designator, but I'm not sure where that is at.

HTH,

Steve

----------------------------------------------------------------------------------------------------------

Please remember to rate helpful posts or to mark the question as answered so that it can be found later.

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

power local settings on Cisco 1042

Good Info as always, Cisco Forums ROCK!

Thanks guys

power local settings on Cisco 1042

If you find CSC helpful support the rating system!

__________________________________________________________________________________________ "Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin ___________________________________________________________

power local settings on Cisco 1042

Gerard you are right, CSC Rocks ... . Don't forget to mark this questions as Answered.

Regards,

Vinay Sharma

Community Manager

Thanks & Regards
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