Asus P5B Premium Series Hardware User Manual page 63

12. Optical drive audio connector (4-pin CD)
This connector allows you to receive stereo audio input from sound sources
such as a CD-ROM, TV tuner, or MPEG card.
P5B PREMIUM Internal audio connector
13. Digital audio connector (4-1 pin SPDIF)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF)
port(s). Connect the S/PDIF Out module cable to this connector, then install
the module to a slot opening at the back of the system chassis.
P5B PREMIUM Digital audio connector
The S/PDIF module is purchased separately.
ASUS P5B Premium Series
CD
(black)
SPDIF_OUT
GND
SPDIFOUT
+5V
2-35