IBM 7944, Installation And User Manual

Page: 36 / 150

-48V return
Ground
-48V
Power input LED
Power output LED
Power error LED
Figure 11. 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 27 .
•
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
“Power-supply LEDs” on page 27 .
•
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
“Power-
supply LEDs” on page 27 .
•
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
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
“Power-supply LEDs” on page 27 .
•
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.
•
System-error LED:
When this LED is lit, it indicates that a system error has occurred. An LED on the light
path diagnostics panel is also lit to help isolate the error.
•
Power-on LED:
When this LED is lit and not flashing, it indicates that the server is 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.
Flashing rapidly (4 times per second):
The server is turned off and is not ready to be turned on. The
power-control button is disabled. This will last approximately 20 to 40 seconds.
Flashing slowly (once per second):
The server is turned off and is ready to be turned on. You can
press the power-control button to turn on the server.
Lit:
The server is turned on.
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System x3550 M3Installation and User's Guide