Tx Power Bug?

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May 4th, 2010
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I have an 1142 on a 2106 running 5.2.157.0.  I have set the A radio to channel 149 and power level 1 (full).  Unless I am misunderstanding the data sheets, that means the AP should be at 20 dBm for that channel and power setting.  However, when I go to the command line and issue 'show ap config 802.11a <Cisco AP>' the output shows a max of 17 dBm.  Is that output just a scripted output showing the power levels for the controller and not specific to my AP?  Is my AP really at 20 dBm?  The max power setting on the same 1142 when in autonomous mode at channel 149 was 20 dBm.  How can I confirm this?


Regards,
Scott

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dancampb Tue, 05/04/2010 - 08:58
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Different channels on 802.11a radios are allowed to transmit at different power levels.  This is per the regulatory bodies like the FCC.  The maximum an 1142 can transmit in the US is at 17dBm.  Channel 149 is one of the channels that can go upto 17dBm.  You can see the maximum tx power per channel under "show controller d1" on the AP.

Scott Pickles Tue, 05/04/2010 - 09:55
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Then why does the autonomous 1142 allow 20 dBm on channel 149 in the US, but not on the controller?

andypenning Wed, 06/02/2010 - 10:55
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scottpickles, did you ever find out the answer to your question? I am seeing the same thing on our 1142s, although they were never autonomous.

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