Dell PowerEdge 2550 - Manual (Page 48)

The green link indicator (the indicator on the left) lights if the adapter is connected to a valid link partner. The amber activity indicator lights if network
data is being sent or received.
¡ If the link indicator is not on, check all connections at the adapter and link partner.
¡ Try changing the auto-negotiation setting on the link partner, if possible.
¡ Try another port on the network switch.
l If the activity indicator does not light, the network driver files may be damaged or deleted. Reinstall the drivers.
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