When you are not connected to any network, this is the mode that will be displayed. The default mode of these USB 3.0 devices according to diagnostics is USB 2.0. These devices are backward compatible with older networks that have speeds below 480 mbps, such as 802.11n 150 and 300 mbps networks. The reason this happens is because the driver switches between USB 2 and USB 3 modes as needed. So the adapter is not really 867 capable after all….hmmmmm.but wait, actually it is. So you just received your brand new 802.11ac USB adapter, capable of 867 mbps, and you plug it in and run a diagnostic program and wait, what’s this? It says it is a USB 2.0 device? You run another diagnostic program and it says the same thing! You know that USB 2.0 is only capable of 480 mbps.
