carlo67,
More reading still required
Ausstar's digital service will deliver a digital signal to the Ausstar set top box (STB). From the STB the signal is analogue. You can not just plug the Ausstar feed into your MCE somehow and expect it to turn up. What you need to do is take the analogue output of the STB and accept that into your MCE via an abnlogue capture / tuner card which is setup in MCE.
I hope this little bit of info helps you back onto a research path that enables you to move forward. I think you still have a long way to go in your journey - enjoy it.