Gigabyte Processor Motherboard GA-7N400S-L User Manual page 74

SPDIF Output Device (Optional Device)
A "SPDIF output" device is an optional device. The
SPDIF_IO cable with rear bracket could link to the
"SPDIF_IO" connector (As picture.) For the further
linkage to decoder, rear bracket provides coaxial cable
and Fiber connecting port.
STEP 1:
Secure the metal bracket of the SPDIF Output
device to the chassis back panel with a screw.
STEP 2:
Connect the SPDIF device cable to the SPDIF_IO
connector on the motherboard.
STEP 3:
Connect SPDIF to the SPDIF decoder.
GA-7N400S(-L) Motherboard - 74 -