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We using AIR-LAP1142N-A-K9- AP's and WISM controllers SW 188.8.131.52.
Our Laptops have A/B/G NIC Cards. How do or can I measure
the difference in throughput? How can I tell if we are even
taking advantage of the "N" radio?
A good and easy way is to use Jperf (Iperf) an grapical tool wich provides you the actual througput of the network. Install this tool on a wired PC and a wireless client.
note; JAVA shoud be installed on both wireless client and fixed PC.