Subject: 603479117 Discrepancies in A-Radio power on same and different model radios
This is Young Kim from the Cisco TAC regarding case 603479117. There are a few issues for the power discrepancies.
With the RM21A radio:
The RM21A radio antenna is basically two antennas built into one module:
5 dBi omnidirectional and 9 dBi patch antennas (AIR-RM-21A-x-K9)
When in omnidirectional mode you will have all available power settings, but in patch mode you will run into the same restrictions as the RM-22A radio modules.
The available power settings that you can use on the RM-22A and RM-21A in 9 dBi patch mode depends on which radio channel you are using.
Channel Freq Highest Power
149 5745 17
153 5765 17
157 5785 14
161 5805 11 <= power gets lower the higher in
frequency (closer to the band edge)
In order for the 802.11A radios to pass FCC emissions with the highest gain antenna that we offer
The device must pass ALL EMISSION TESTING WITH THE HIGHEST GAIN WE OFFER - when tested using the HIGHEST POWER SETTING available to our customers.
Therefore, the RM-21 radio (when in LOW gain antenna mode) and since it's antenna is built in will produce a full 17 dBm across the entire UNII-3 spectrum.
Since in this mode a user can not connect a higher gain antenna, it is permitted to run at full power however, when a connectorized model with external RP-TNC antenna ports are used, the power needs to be scaled back on channels 157 and 161 as
these channels are closer to the band edges.
channel 34 - 48 and 161 highest power level is 11
channel 157 highest output is 14
channel 52 - 60, 149 - 153 is 17
There is a documentation bug that has been opened for this lack of information. The bug ID is CSCeg70287:
show controller dot11 output undocumented
Here is also a useful URL that shows 802.11A transmit power based on band usage:
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(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
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