Rear view LEDsThe following illustration shows the LEDs on the rear of the server. For moreinformation about solving power-supply problems, see the Problem Determinationand Service Guide.DC!ACDC!ACAC powerLED green( )DC powerLED green( )Power-supplyerror LEDamber( )Ethernet activityLEDEthernet linkLEDSystem-errorLEDLocatorLEDEthernet linkLEDEthernet activityLEDAC 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, boththe ac and dc power LEDs are lit. For any other combination of LEDs, see theProblem Determination and Service Guide.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 sufficient 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.Power-supply error LED: When the power-supply error LED is lit, it indicates thatthe power supply has failed. See the Problem Determination and Service Guide fordetailed information about power-supply errors.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 to theEthernet port.For the system-management port, this LED is on to indicate that there is an activelink connection on the 100BASE-T. When this LED is off, this indicates an activelink connection on the 10BASE-TX interface.Ethernet link LEDs: When these LEDs are lit, they indicate that there is an activelink connection on the 10BASE-T, 100BASE-TX, or 1000BASE-TX interface for theEthernet port.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. This LED is functionally equivalent to the system-error LED on the front of theserver.16 IBM System x3755 M3 Type 7164: Installation and User’s Guide
