User Guide

1.10 Connectors
1.10.1 Rear panel connectors
1. Coaxial S/PDIF Out port. This port connects an external audio output device via an
coaxial S/PDIF cable.
2. Video Graphics Adapter (VGA) port
This 15-pin port is for a VGA monitor or other
VGA-compatible devices.
3. USB 2.0 ports 3 and 4.
These two 4-pin Universal Serial Bus (USB) ports are
available for connecting USB 2.0 devices.
4. LAN (RJ-45) port.
This port allows Gigabit connection to a Local Area Network (LAN)
through a network hub.
5. RCA Out port (right-channel). This port connects a receiver or a TV via an RCA
cable.
6. Center/Subwoofer port (orange).
This port connects the center/subwoofer speakers.
7. Rear Speaker Out port (black).
This port connects the rear speakers in a 4-channel,
6-channel, or 8-channel audio conguration.
8. Line In port (light blue).
This port connects the tape, CD, DVD player, or other audio
sources.
9. Line Out port (lime).
This port connects a headphone or a speaker. In 4-channel,
6-channel, and 8-channel conguration, the function of this port becomes Front Speaker Out.
10. Microphone port (pink).
This port connects a microphone.
11. Side Speaker Out port (gray).
This port connects the side speakers in an 8-channel
audio conguration.
Refer to the audio conguration table on next page for the function of the audio ports in 2,
4, 6, or 8-channel conguration.
LAN port LED indications
Status Left LED Right LED
OFF OFF OFF
10 Mbps connection
Orange (blinking during
data activity)
OFF
100 Mbps connection OFF
Orange (blinking during
data activity)
1 Gbps connection OFF
Green (blinking during
data activity)
Right
LED
Left
LED
LAN port
1-18 ASUS M4A78-HTPC