4  Dedicated XClarity Controller (XCC) network connector 
Used to attach an Ethernet cable to manage the system using XClarity Controller.
5  6  Ethernet connectors 1 and 2
Used to attach an Ethernet cable for a LAN. Each Ethernet connector has two status LEDs to help you 
identify the Ethernet connectivity and activity. For more information, see 
“Rear view LEDs” on page 22. 
Ethernet 1 connector can be set as XClarity Controller Network connector.
To set Ethernet 1 connector as XClarity Controller Network connector, start Setup Utility and select BMC 
Settings ➙ Network Settings ➙ Network Settings Network Interface Port : Shared. Then, click Shared 
NIC on and select Onboard Port 1.
7  8  USB 3.2 Gen 2 connectors
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.
9  PCIe slots
There are four PCIe slots on the system board to install appropriate PCIe adapters. For information about the 
PCIe slots, see 
“Specifications” on page 3.
Rear view LEDs
The illustration in this section shows the LEDs on the rear the server.
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ThinkSystem ST250 V2 Setup Guide