Abit KN9S User Manual page 34

Line-Out: Connects to the front left and front right channel in the 7.1-channel or regular
2-channel audio system.
Mic-In: Connects to the plug from external microphone.
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LAN1: Connects to Local Area Network.
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LAN2: Connects to Local Area Network. (For model "KN9 SLI" and "KN9 Ultra" only)
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USB1/USB2: Connects to USB devices such as scanner, digital speakers, monitor, mouse,
keyboard, hub, digital camera, joystick etc.
2-24 KN9 SLI, KN9 Ultra, KN9S