IBM System x3500 Installation And User Manual page 41

The following illustration shows the LEDs on the rear of the server.
v Ethernet activity LEDs: When these LEDs are lit, they indicate that the server is
transmitting to or receiving signals from the Ethernet LAN that is connected to
the Ethernet port.
v Ethernet link LEDs: When these LEDs are lit, they indicate that there is an
active link connection on the Ethernet port.
v AC power LED: Each hot-swap power supply has an ac power LED. When the
ac power LED is lit, it indicates that sufficient power is coming into the power
supply through the power cord. During typical operation, the ac power LED is lit.
For any other combination of LEDs, see the Problem Determination and Service
Guide on the IBM System x Documentation CD.
v DC power LED: Each hot-swap power supply has a dc power LED and an ac
power LED. When the dc power LED is lit, it indicates that the power supply is
supplying adequate dc power to the system. During typical operation, both the ac
and dc power LEDs are lit. For any other combination of LEDs, see the Problem
Determination and Service Guide on the IBM System x Documentation CD.
v Power-supply error LED: When the power-supply error LED is lit, it indicates
that the power supply has failed.
Note: Power supply 1 is the default/primary power supply. If power supply 1
fails, you must replace the power supply immediately.
Chapter 1. The System x3500 M4 server
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