AC LED(green)DC LED(green)Power-supplyerror LED(amber)Power-on LED (green)Locator LED (blue)System error LED (amber)Ethernetactivity LEDEthernetlink LEDQPI link LEDsv QPI ports: Insert either a QPI cable or a filler panel in each of these connectors.Attention: When you handle the QPI cables, take precautions to avoiddamaging the high density interface. Dropping and incorrectly connecting theQPI cables can damage the high density interface. Store the protective coversthat come on the end of the QPI cables for reuse when you perform maintenanceon the server or when you remove the cables for some reason.v PCI riser slot 1: Insert the PCI riser card with two slots or the PCI riser cardswith one slot into this slot. Standard models of the server come with two PCIExpress riser assemblies. See “Replacing an adapter” on page 275 for thesupported adapters for these riser-cards.v PCI slot 2: Insert the PCI riser card with three slots into this slot. Standardmodels of the server come with two PCI Express riser assemblies. See“Replacing an adapter” on page 275 for information about adapters that thisriser card supports.v Power connector: Connect the power cord to this connector.v AC power LED: Each hot-swap power supply has an ac power LED and a dcpower LED. When the ac power LED is lit, it indicates that sufficient power isbeing supplied to the power supply through the power cord. During normaloperation, both the ac and dc power LEDs are lit. For any other combination ofLEDs, see “Power-supply LEDs” on page 78.v DC power LED: Each hot-swap power supply has a dc power LED and an acpower LED. When the dc power LED is lit, it indicates that the power supply issupplying adequate dc power to the system. During normal operation, both theac and dc power LEDs are lit. For any other combination of LEDs, see“Power-supply LEDs” on page 78.v System-error LED: When this LED is lit, it indicates that a system error hasoccurred. An LED on the light path diagnostics panel is also lit to help isolatethe error. This LED is functionally equivalent to the system-error LED on thefront of the server.v Power-on LED: When this LED is lit and not flashing, it indicates that the serveris turned on. This LED is functionally equivalent to the Power-on LED on thefront of the server. The states of the power-on LED are as follows:Off: AC power is not present, or the power supply or the LED itself hasfailed.Chapter 2. Introduction 15