Control panel closed
Part number 3500747,3500807,3500859
The LEDs on the front panel ,in order of left to right, are: Power LED, Network Interface Connector (NIC) LED, Fault LED, and the Drive Fault LEDs.
The power LED is capable of showing three power related states; Solid on, Blinking 1 hertz (Hz), Blinking 3 Hz. The BaseBoard Management Controller (BMC) interprets the state of 5V standby, 5V, the Power State, and the PS-ON signal and drives the Power LED according to the following table:
The NIC LED is illuminated when the server senses netowrk activity. It is off when it senses no network activity.
The Fault LED is not designed to detect all system faults. The puropse of the fault LED is to alert the System Administrator that a Power Fault has occurred. The BMC monitors whether the power supply is on and operational using the PWR_GD_PS from the power supply. The controller uses the PWR_GD_PS signal to confirm whther the actual system power state matches the intended system on/off power state that was commanded using PS-ON.
This signal generates an interrupt to the BMC, which it uses to detect loss of AC power. If AC power suddenly is lost, the BMC attempts to assert a system reset before to power is completely off.
If the BMC asserts PS-ON and PWR_GD_PS does not become asserted, the BMC asserts the Fault LED signal on the front panel connector. It then continues to wait for the power supply to assert PWR_GD_PS; if the supply does eventually drive the signal, the BMC clears the power fault state and then proceeds to take the system out of reset.
Drive Fault LEDs
The four drive fault LEDs are controlled by the micro-controller on the hot-swap backplane and are used to indicate a failure status for each drive. The position of the Drive Fault LEDs on the front panel correspond to the position of the drive connections on the SCSI backplane. The SCSI IDs are 0 and 1 for the top row, 2 and 3 for the bottom row.
A front panel interface connector is provided for an electrical path between the hot-swap SCSI backplane, drive fault LEDs, and front panel drive activity indication. During initialization, the micro-controller flashes the LEDs for 1 second as part of the POST.