Controller or a remote management program to change the state of the system ID LEDs to assist in visually
locating the server among other servers.
If the XClarity Controller USB connector is set to have both the USB 2.0 function and XClarity Controller
management function, you can press the system ID button for three seconds to switch between the two
functions.
5 System error LED
The system error LED provides basic diagnostic functions for your server.
Status Color
Description Action
On
Yellow An error has been detected on the server.
Causes might include one or more of the
following errors:
• The temperature of the server reached
the non-critical temperature threshold.
• The voltage of the server reached the
non-critical voltage threshold.
• A fan has been detected to be running at
low speed.
• A fan has been removed.
• The power supply has a critical error.
• The power supply is not connected to
the power.
Check the event log to determine the exact
cause of the error.
Off None The server is off or the server is on and is
working correctly.
None.
6 Opening for temperature sensor
Used to detect the surrounding temperature.
7 XClarity Controller USB connector
Depending on the setting, this connector supports USB 2.0 function, XClarity Controller management
function, or both.
• If the connector is set for USB 2.0 function, you can attach a device that requires a USB 2.0 connection,
such as a keyboard, a mouse, or a USB storage device.
• If the connector is set for XClarity Controller management function, you can attach a mobile device
installed with the application to run XClarity Controller event logs.
• If the connector is set to have both functions, you can press the system ID button for three seconds to
switch between the two functions.
8 USB 3.0 connector
Used to attach a device that requires a USB 2.0 or 3.0 connection, such as a keyboard, a mouse, or a USB
flash drive.
Rear view
The rear of the server provides access to several connectors and components.
18
ThinkSystem ST550 Maintenance Manual
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