Asus Z9PE-D8 WS - Manual (Page 61)

ASUS Z9PE-D8 WS 2-39
13. 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.
14. IEEE 1394a port connectors (10-1 pin IE1394_1/2)
These connectors are for IEEE 1394a port. Connect the IEEE 1394a 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.
The IEEE 1394a module is purchased separately.
Never connect a USB cable to the IEEE 1394a connector. Doing so will damage
the motherboard!