Line In port (light blue). This port connects to a tape, CD, DVD player, or other audiosources.Line Out port (lime). This port connects to a headphone or speaker. In a 4.1 or5.1-channel configuration, the function of this port becomes Front Speaker Out.Microphone port (pink). This port connects to a microphone.Refer to the audio configuration table for the function of the audio ports in a 2.1, 4.1, or5.1-channel configuration.Rear panelUSB 3.1 ports type A. This Universal Serial Bus 3.1 (USB 3.1) port is for USB 3.1 device.LAN (RJ-45) port. This port allows Gigabit connection to a Local Area Network (LAN)through a network hub.LAN port LED indicationsActivity/Link LED Speed LEDStatus Description Status DescriptionOFF No link OFF 10Mbps connectionORANGE Linked ORANGE 100Mbps connectionBLINKING Data activity GREEN 1Gbps connectionLAN portSPEEDLEDACT/LINKLEDASUS K20CE / A20CE / F20CE15ENGLISHAudio 2.1, 4.1, or 5.1-channel configurationPort Headset 2.1-channel 4.1-channel 5.1-channelLight Blue (Rear panel) Line In Rear Speaker Out Rear Speaker OutLime (Rear panel) Line Out Front Speaker Out Front Speaker OutPink (Rear panel) Mic In Mic In Bass/Center