12.System panel connector (20-pin PANEL)

This connector accommodates several system front panel functions.

 

 

Speaker

Power LED

Connector

+5VSB

PLED

+5V

Ground Ground Speaker

P4SDR-VM

 

 

 

+5 V

MLED

ExtSMI# Ground PWR Ground

Reset Ground

MessageLED

 

Reset SW

ATX Power

SMI Lead

 

 

Switch*

* Requires an ATX power supply.

P4SDR-VM System Panel Connectors

•System Power LED Lead (3-1 pin PLED)

This 3-1 pin connector connects to the system power LED. The LED lights up when you turn on the system power, and blinks when the system is in sleep mode.

•System Warning Speaker Lead (4-pin SPEAKER)

This 4-pin connector connects to the case-mounted speaker and allows you to hear system beeps and warnings.

•System Message LED Lead (2-pin MLED)

This 2-pin connector is for the system message LED that indicates receipt of messages from a fax/modem. The normal status for this LED is ON, when there is no incoming data signal. The LED blinks when data is received. The system message LED feature requires an ACPI OS and driver support.

•System Management Interrupt Lead (2-pin SMI)

This 2-pin connector allows you to manually place the system into a suspend mode, or “green” mode, where system activity is instantly decreased to save power and to expand the life of certain system components. Attach the case-mounted suspend switch to this 2-pin connector.

•ATX Power Switch / Soft-Off Switch Lead (2-pin PWR)

This connector connects a switch that controls the system power. Pressing the power switch turns the system between ON and SLEEP, or ON and SOFT OFF, depending on the BIOS or OS settings. Pressing the power switch while in the ON mode for more than 4 seconds turns the system OFF.

•Reset Switch Lead (2-pin RESET)

This 2-pin connector connects to the case-mounted reset switch for rebooting the system without turning off the system power.

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Chapter 2: Hardware information