If the livestream link on the hockey schedule website takes you to a PAC12 page then you'd have to be a subscriber, I believe. Being I have the PAC12 DISH channel it likely just automatically takes me there, so maybe that has something to do with my access. Go to the ASU hockey website and typically there is a link to the livestream website at game time.
Otherwise you might have to do some googling to see how you can hack in or go to a bar that has PAC12 livestream.
The PAC12 channel does cast to ROKU, just watched ASU volleyball doing such.