Asus Striker Extreme - Manual (Page 60)

2-34 Chapter 2: Hardware information
9. S/PDIF output connector (4-1 pin SPDIF_02)
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.
The S/PDIF module is purchased separately.
STRIKER EXTREME
®
STRIKER EXTREME SPDIF OUT connector
+5V
SPDIFOUT
GND
SPDIF_O2