IBM Netfinity 7100 User's Reference Manual page 22

Ethernet transmit/receive activity light: When this green light is on, there is
activity between the server and the network.
Ethernet-link status light: When this green light is on, there is an active
connection on the Ethernet port.
Ethernet speed 100 Mbps: When this green light is on, the Ethernet speed is
100 Mbps. When the light is off, the Ethernet speed is 10 Mbps.
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IBM® Netfinity® 7100 User's Reference