System-locator LED: Use this LED to visually locate the server among other
servers. You can use IBM Director to light this LED remotely.
Power-on LED: When this LED is lit and not flashing, it indicates that the server is
turned on. When this LED is flashing, it indicates that the server is turned off and
still connected to an ac power source. When this LED is off, it indicates that ac
power is not present, or the power supply or the LED itself has failed.
Serial connector: Connect a 9-pin serial device to this connector. The serial port is
shared with the baseboard management controller (BMC). The BMC can take
control of the shared serial port to perform text console redirection and to redirect
serial traffic, using Serial over LAN (SOL).
SAS connector: Connect a serial-attached SCSI (SAS) device to this connector.
Internal connectors, LEDs, and jumpers
The illustrations in this section show the LEDs, connectors, and jumpers on the
internal boards. The illustrations might differ slightly from your hardware.
8 IBM System x3650 Type 7979 and 1914: Problem Determination and Service Guide