IBM x3105 - System - 4347 Service Manual page 24

AC power LED
Video connector
Parallel connector
Serial connector
Ethernet link status LED
USB connectors
Ethernet connector
Ethernet activity LED
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IBM System x3105 Type 4347: Problem Determination and Service Guide
When this green LED is lit, it indicates that the server is connected to an ac
power source.
Connect a monitor to this connector.
Connect a parallel device to this connector.
Connect a 9-pin serial device to this connector.
This LED is on the Ethernet connector. When this LED is lit, it indicates that
there is an active connection on the Ethernet port.
Connect USB devices to these connectors.
Use this connector to connect the server to a network.
This LED is on the Ethernet connector. When this LED is lit, it indicates that
there is activity between the server and the network.