Asus P6-P5G41E - Manual (Page 35)

3-6 Chapter 3: Motherboard info
3. Digital Audio connector (4-1 pin SPDIF_OUT)
This connector is for the S/PDIF audio module to allow digital sound output.
Connect one end of the S/PDIF audio cable to this connector and the other
end to the S/PDIF module.
The S/PDIF out module is purchased separately.
SPDIF_OUT
+5
V
SPDIFOUT GND
P5QPL10T
P5QPL10T Digital audio connector
4. Serial port connectors (10-1 pin COM1)
The connector is for a serial (COM) port. Connect the serial port module
cable to the connector, then install the module to a slot opening at the back of
the system chassis.
The serial port bracket (COM1) is purchased separately.
P5QPL10T Serial port (COM1) connector
COM1
P5QPL10T
PIN 1