Cambridge DAC Magic 2 Question from Newbie

Hi- I'm a real newbie. I aquired a DAC Magic 2 (british version 220v) it has two DMC inputs- one labelled "CD" and the other labelled "DAT". There is a third labelled "Optical".

I am looking to hook up my airport express to this. Can I hook it up to the DAT DMC? Can I hook it up to the optical?

I can't quite figure out which type of cable to use for the optical. It's not DMC, Toslink or mini-toslink. I took the lid off and th input is labelled "RX176".

I understand the Airport Express is a mini-toslink, but what is the "optical input" I have?

Your help would be GREATLY appreciated.I can send pics if anyone can help.