Asus Xonar D2/PM - Manual (Page 9)

9 ASUS Xonar D2 Installation Guide
English
SPDIF In
Connecting headphone / microphone
You can also use a coaxial cable for a S/PDIF digital connection. Just plug the
coaxial RCA male connector to the S/PDIF-In combo jack and connect the other
end into the coaxial S/PDIF output on the player.
Plug the optical TOSLINK adaptor into the S/PDIF-In combo connector. Then,
connect your MD/CD/DVD player’s S/PDIF out port to the optical adaptor with the
TOSLINK optical cable