802.11b/g power setttings in 1242 / 1131 AP's

Unanswered Question
Jan 27th, 2009


In the US regulatory domain, 802.11b has a max power of 20dB (100mW) and 802.11g seems to have a max of 17dB (50mw). My question is, if in the LWAPP controller, you set global power levels to 1, what is the actual power level at for 802.11b and 802.11g? Does the radio have to switch based on the protocol of the client? Or is power level 1 and 2 the same on 802.11g?

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jeff.kish Wed, 01/28/2009 - 11:46

Rather than thinking about it in terms of radio or protocol, think of it in terms of the encoding protocol. OFDM is limited to 30mW (I thought, maybe it's 50 though). CCK is limited to 100mW. Therefore, you could have an 802.11g client operating at 100mW while using CCK at 11Mbps.

To answer your question, the power levels are adjusted per protocol, not per radio.

kevin.flynn Wed, 01/28/2009 - 12:18

That's kind of what I thought. The big question is, if I set a 1242 AP to Power Level 3 in the Cisco WLAN Controller, is the max power output lowered by 6dB for each protocol? Or is only the power ceiling lowered?


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