Asus Xonar D2/PM - Manual (Page 8)

8 ASUS Xonar D2 Installation Guide
English
For Digital Speakers
7.1 Speakers
SPDIF Out
You can also use a coaxial cable for a S/PDIF connection. Just plug the coaxial
RCA male connector to the S/PDIF-Out combo jack and connect the other end
into the coaxial S/PDIF input on your decoder.
Plug the optical TOSLINK adaptor into the S/PDIF-Out combo connector. Then,
connect your MD/CD/DVD player’s S/PDIF in port to the optical adaptor with the
TOSLINK optical cable