How could change a interface's type and bandwidth in a device?

How could change a interface's type and bandwidth in a device?

Hi,
I'm doing same test monitoring several Alvarion Wimax devices. This devices have one ethernet interface and one radio interface. The radio interface is discovered like a ethernet interface.
Could be posible change this interface's bandwidth and type?

The radio Interface's bandwidth of this devicas can be 8Mbps and 54Mbps but detect 8Mbps for all and although I change in the radio interface the bandwidth to 54Mbps I have an alarm when bandwith is up to 8Mbps' 90%.

Thanks.
Regards.
Luis.

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