Power LED:

This 3-pin connector attaches to the power LED.

HDD Activity LED:

This 2-pin connector attaches to the LED of the hard disk. The LED lights up

 

when HDD is active.

Power Switch:

This 2-pin connector attaches to the power button of the system.

Reset Switch:

This 2-pin connector attaches to the case-mounted reset switch for rebooting your

 

computer without turning on/off your power switch.

ACPI Sleep Switch:

This 2-pin connector connects to the switch that can take the system into standby

 

mode when pressed.

NMI to CPU Switch:

This 1-pin connector connects to the switch that send Non-Maskable Interrupt to

 

the CPU. User can customize the button to perform a particular function.

5 VSB:

This connector provides the user with power to any extra devices that uses 5 volt

 

power.

Cooling Fault LED:

This connector connects to the LED that lights up when a problem arises with

 

cooling system.

System Fault LED:

This connector connects to the LED that lights up when a problem arises with the

 

system.

LAN#1 Activity LED:

This connector connects to the LED that lights up when there is activity on the

 

LAN 1 port.

SMBus SDA:

A private bus to BMC chip for serial data, for use with BMC only.

SMBus SCL:

A private bus to BMC chip for serial clock, for use with BMC only.

Chassis Intrusion:

This connects to the mechanical switch that indicates whether the chassis had

 

been opened. User can activate it if desired.

LAN#2 Activity LED:

This connector connects to the LED that lights up when there is activity on the

 

LAN 2 port.

# Pin-27 to Pin-34 are reserved for OEM purpose

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Intel LH500 user manual Computer without turning on/off your power switch