Technical Product Specification

Intel® Server Boards S4600LH2/T2 TPS
Revision 2.0
110
10.4
Post Code Diagnostic LEDs
A bank of eight POST code diagnostic LEDs are located on the back edge of the server next to the stacked
USB connectors. During the system boot process, the BIOS executes a number of platform configuration
processes, each of which is assigned a specific hex POST code number. As each configuration routine is
started, the BIOS displays the given POST code to the POST code diagnostic LEDs. The purpose of these
LEDs is to assist in troubleshooting a system hang condition during the POST process. The diagnostic LEDs
can be used to identify the last POST process to be executed. See Appendix D for a complete description of
how these LEDs are read, and for a list of all supported POST codes
10.5
12 Volt Stand-By Present LED
This LED is illuminated when a power cord (AC or DC) is connected to the server and the power supply is
supplying 12 Volt Stand-by power to the server board. This LED is intended as a service caution indicator to
anyone accessing the inside of the server system.
10.6
P12V1 LED
This LED is illuminated during run time when a power cord (AC or DC) is connected to the server and the
power supply is supplying 12 Volts to the server board. This LED is normally lit indicating that 12V is present
in on the Left side of the board. It is also intended as a service caution indicator to anyone accessing the
inside of the server system.
10.7
P121V2 LED
This LED is illuminated during run time when a power cord (AC or DC) is connected to the server and the
power supply is supplying 12 Volts to the server board. This LED is normally lit indicating that 12V is present
in on the Right side of the board. It is also intended as a service caution indicator to anyone accessing the
inside of the server system.
10.8
CPU Fan Fault LEDs
The server board includes a CPU Fan Fault LEDs (DS14-19) for all four CPUs. The LED has two states: On
and Off. The BMC lights a fan fault LED if the associated fan-tach sensor has a lower critical threshold event
status asserted. Fan-tach sensors are manual re-arm sensors. Once the lower critical threshold is crossed, the
LED remains lit until the sensor is rearmed. These sensors are rearmed at system DC power-on and system
reset.
10.9
System Power Good LED
The Power Good LED is illuminated when system power is turned on and DC power to the server board is
within acceptable limits.
10.10
CATERR LED
For processors that support the Intel
®
Quick Path Interconnect interface, the CATERR# signal is used to
indicate that a catastrophic error condition has been experienced by the processor. Should such an error
occur, the CATERR LED on the server board will illuminate.