Lenovo System x3550 M3 Problem Determination And Service Manual page 26

• Ethernet connectors: Use either of these connectors to connect the server to a network. When you use
the Ethernet 1 connector, the network can be shared with the IMM through a single network cable.
The following illustration shows the LEDs on the rear of the server.
Figure 7. Rear view LEDs
The following illustration shows the LEDs on a dc power supply.
Power input LED
Power output LED
Power error LED
Figure 8. DC power supply LEDs
• 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.
• Ethernet link LEDs: When these LEDs are lit, they indicate that there is an active link connection on the
10BASE-T, 100BASE-TX, or 1000BASE-TX interface for the Ethernet port.
• AC power LED: Each hot-swap ac power supply has an ac power LED and a dc 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
"Power-supply LEDs" on page
• IN OK power LED: Each hot-swap dc power supply has an IN OK power LED 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
• 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
supply LEDs" on page
• OUT OK power LED: Each hot-swap dc power supply has an IN OK power LED and an OUT OK power
LED. When the OUT OK power LED is lit, it indicates that the power supply is supplying adequate dc
System x3550 M3Problem Determination and Service Guide
14
-48V Ground -48V return
391.
"Power-supply LEDs" on page
391.
391.
"Power-