I need to limit radio signal pickup

Unanswered Question
Apr 16th, 2007

Where can I limit the signal level an LWAPP access point "sees"? I am filter out rogue APs with signal levels of less than -85. I thought I saw it somewhere, but now I cannot find it.

I am using an WCS and a Wism in a 6500.


I have this problem too.
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prakashj Tue, 04/17/2007 - 01:44


We can reduce the signal strenght,By reducing the Tx Power level from the WISM.

Pls follow up the way

WISM->Wireless-->then select the option from 802.2 B/G option from the left side.

You can see the AP list-->Configure

In that You can see Tx power level.Just change and see the differece.

I hope this hill help you.


Saji k.s

klgodfrey Thu, 04/19/2007 - 11:33

Thanks, but I thought I saw a threshold limit somewhere. I may be mistaken. Am I?


rob.huffman Thu, 04/19/2007 - 11:40

Hi Konrad,

Maybe this is the default value you were referring to?

Transmit Power Control Algorithm

The TPC algorithm, run at an un-modifiable ten-minute interval, is used by the RF Group Leader to determine APs RF proximities and adjust each band?s transmit power level downward, as necessary. this is performed in order to limit excessive cell overlap and co-channel interference.

Each AP reports an RSSI-ordered list of all neighboring APs. Provided an AP has three or more neighboring APs, the RF Group Leader applies the TPC algorithm on a per-band, per-AP basis in order to adjust AP power transmit levels downward such that the third loudest neighbor AP is heard at a signal level of -65dBm (default value) or lower.

Power changes are only made when the third loudest neighbor of a given AP is heard at a signal level higher than the default value of -65 dBm.

Note: When all APs boot up for the first time, the APs transmit at their maximum power levels. Also, if the APs do not see each other with a -65dBm (default value), they push the power level up to the maximum in order to achieve this. If you go to the Controller CLI and issue the show ap auto-rf 802.11b command, there is a Nearby APs section near the bottom of the command output. In this section, you find the dBm listing. If this dBm listing has values more than -65, then the AP transmit power is at the maximum. This is tweakable to an extent. You can issue the Config advanced 802.11b tx-power-control-thresh <-50 to -80> command.

From this excellent doc (Thanks Ben!);


Hope this helps!


john.preves Mon, 04/23/2007 - 21:45

Hey Rob,

I thought I was going crazy before, but now you just confirmed I'm ok.

I have the same doc saved to my files but the new doc online says the fourth loudest neighbor. I don't know if it's a typo or they are just tired of answering the phone when somebody's stuff doesn't work.


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