The following illustration shows the LEDs on a dc power supply.-48V returnGround-48VPower input LEDPower output LEDPower error LEDv Ethernet activity LEDs: When these LEDs are lit, they indicate that the server istransmitting to or receiving signals from the Ethernet LAN that is connected tothe Ethernet port.v Ethernet link LEDs: When these LEDs are lit, they indicate that there is anactive link connection on the 10BASE-T, 100BASE-TX, or 1000BASE-TXinterface for the Ethernet port.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 iscoming into the power supply through the power cord. During typical operation,both the ac and dc power LEDs are lit. For any other combination of LEDs, seethe Problem Determination and Service Guide on the IBM System xDocumentation CD.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 typical operation, both the acand dc power LEDs are lit. For any other combination of LEDs, see the ProblemDetermination and Service Guide on the IBM System x Documentation CD.v Power-supply error LED: When the power-supply error LED is lit, it indicatesthat the power supply has failed.Note: Power supply 1 is the default/primary power supply. If power supply 1fails, you must replace the power supply immediately.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 isolate theerror.v Power-on LED: When this LED is lit and not flashing, it indicates that the serveris turned on. The states of the power-on LED are as follows:Off: Power is not present, or the power supply or the LED itself has failed.28 IBM System x3550 M2 Types 4198 and 7946: Installation and User’s Guide
