Diagnostic LEDs
                                                                    v1.00
      
      
      Link integrity
      ==============
      
      LNK light: Indicates the adapter is connected to a hub or switch
                 and is receiving link pulses. If the LNK light isn't
                 lit, check all connections at the adapter and the hub.
                 Also, make sure the adapter drivers are loaded.
      
      ACT light: Indicates read/write activity on the network. It doesn't
                 always mean there is activity on the adapter. If the ACT
                 light isn't lit, make sure the hub and network are
                 operating and the drivers are loaded.