Since the 1050 only has 2 digital optical connections and 1 digital coax connection... is it possible to convert a digital optical cable to digital coax?

Here's my problem...

DVD = Digital Optical
DirecTivo = Digital Optical
Xbox = Digital Optical

None of these has the option to use a Digital Coax connection! I don't want to run my Xbox analog... what can I do? Switching cables manually is not a choice and switching them with a switch box is out the window as well. I just bought a component switch box and am not about to shell out more money for an optical switch box now. lol

Help!

Thanks.

Larry