radio mode


I'm checking clients in cnmaestro. I would like to know what radio mode are tehy working.

I open system - clientes and I see the colunm "Radio Mode" with "g", "gn", "bgn", ect.

How is the interpretations? What is the difference? How could a client use bgn standards in the same time?

In other vendor I find "b", "g" or "n" at time.