IBM eServer 342 xSeries Installation Manual page 37

Ethernet link status light: This green LED lights when there is an active connection
on the Ethernet port during typical operation, when the system is powered off the
LED remains green.
Information light: This amber light is on when the information log contains
information about certain conditions in your server that might affect performance.
System error light: This amber light is lit when a system error occurs. An LED on the
diagnostic LED panel will also be on to further isolate the error.
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Chapter 3. Server power, controls, and indicators