IBM System x3550 M3 Type 4254 Installation And User Manual page 42

The following illustration shows the LEDs on a dc power supply.
Power output LED
v Ethernet activity LEDs: When these LEDs are lit, they indicate that the server is
v Ethernet link LEDs: When these LEDs are lit, they indicate that there is an
v AC power LED: Each hot-swap power supply has an ac power LED and a dc
v IN OK power LED: Each hot-swap dc power supply has an IN OK power LED
v DC power LED: Each hot-swap power supply has a dc power LED and an ac
v OUT OK power LED: Each hot-swap dc power supply has an IN OK power LED
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IBM System x3550 M3 Types 4254 and 7944: Installation and User's Guide
Power input LED
Power error LED
transmitting to or receiving signals from the Ethernet LAN that is connected to
the Ethernet port.
active link connection on the 10BASE-T, 100BASE-TX, or 1000BASE-TX
interface for the Ethernet port.
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,
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.
and an OUT OK power LED. When the IN OK power LED is lit, it indicates that
sufficient power is coming into the power supply through the power cord. During
typical operation, both the IN OK and OUT OK power LEDs are lit. For any other
combination of LEDs, see the Problem Determination and Service Guide on the
IBM System x Documentation CD.
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.
and an OUT OK power LED. When the OUT OK power LED is lit, it indicates that
the power supply is supplying adequate dc power to the system. During typical
operation, both the IN OK and OUT OK power LEDs are lit. For any other
combination of LEDs, see the Problem Determination and Service Guide on the
IBM System x Documentation CD.
-48V Ground -48V return