I have NEVER seen an optical port that looked like that. The usual looks like this but has a cover.
I don't know how it could possibly act as both and optical out and a Mic port. BTW did you RTFM? xD I'm sure it covers it. If you don't have it anymore you can DL it at the creative website.
Originally Posted by G|F.E.A.D|Killa
there is no Xfi (creative) card that has optical on it with out the console. what your talking is the spdif out and it uses a normal 3.5mm jack that sends out digital data to a receiver usaully in the form of DTS or DD.
If you look at the card's PCI plate it clearly says Optical Out. I call shenanigans on Creative's part.