I am assuming you are using the shub in router mode. Go to
http://192.168.0.1 and enter your username/pass (it is admin/changeme or the other way around, I cant remember). They have changed the GUI since I last used it but you need to click on something like a "connection" tab and "status" and it will listeach of the 8 downstream channels, the two upstream channels and what speed you are provisioned for.