Digital Output Cable Question

I know newsgroup people hate newbies... but I have a simple question. (I hope)

My brother owns the Boss bass processor GT-6B. It has a digital output which
uses an optical cable. I bought one and it fits my soundcard but not into his
processor. 

All that is listed in his instruction manual is the following:EIAJ CP1201, S/P
DIF

I can find it mentioned randomly online but I'm not tech wise enough to
understand if this is the part/size of the cable he needs to get or if it's
just specs on the output.

If anyone could point me in the right direction, be it a website that might
have the answer or sharing any knowledge that you might have on the subject I'd
be more then greatly appreciative.

Thanks
-Frank