IBM Netfinity 4500R Type 8656 Hardware Maintenance Manual page 18

Ethernet Transmit/Receive Activity Light: When this green light is on, there is
transmit or receive activity to or from the server.
Information Light: This amber light is on when the information log contains
information about certain conditions in your server that might affect performance. For
example, the light will be on if your server does not have redundant power. A light on
the diagnostic LED panel on the system board will also be on.
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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Hardware Maintenance Manual: Netfinity 4500R Type 8656