Asus M4N82 Deluxe - Manual (Page 48)

2-28 Chapter 2: Hardware information
Chapter 2
2.7.3 Internal connectors
1. Digital audio connector (4-1 pin SPDIF_OUT)
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.
2. Optical drive audio connector (4-pin CD)
These connectors allow you to receive stereo audio input from sound sources such as
a CD-ROM, TV tuner, or MPEG card.