Asus P7F-C/SAS - Manual (Page 51)

ASUS P7F-C Series 2-33
13. Auxiliary panel connector (20-pin AUX_PANEL1)
This connector is for additional front panel features including front panel
SMB, locator LED and switch, chassis intrusion, and LAN LEDs.
1. Front panel SMB (6-1 pin FPSMB)
These leads connect the front panel SMBus cable.
2. LAN activity LED (2-pin LAN1_LED, LAN2_LED)
These leads are for Gigabit LAN activity LEDs on the front panel.
3. Chassis intrusion (4-1 pin CHASSIS)
These leads are for the intrusion detection feature for chassis with
intrusion sensor or microswitch. When you remove any chassis
component, the sensor triggers and sends a high-level signal to these
leads to record a chassis intrusion event. The default setting is short
CASEOPEN and GND pin by jumper cap to disable the function.
4. Locator LED (2-pin LOCATORLED1 and 2-pin LOCATORLED2)
These leads are for the locator LED1 and LED2 on the front panel.
Connect the Locator LED cables to these 2-pin connector. The LEDs will
light up when the Locator button is pressed.
5. Locator Button/Swich (2-pin LOCATORBTN)
These leads are for the locator button on the front panel. This button
queries the state of the system locator.