D-Link DI-308 - Manual (Page 117)

DI-308 ISDN Remote Router
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3. Verify with your network administrator that the IP address and the IP subnet mask
configured in the Network Configuration, IP Configuration, IP Stack
Configuration, LAN submenu of the console program are valid for that LAN.
4. Check the physical Ethernet cable, and make sure the connections on the router
and the switch or station are secure.
5. Check to make sure an end station IS NOT connected to the Uplink port or that a
switch or hub IS connected to the Uplink port using straight-through cables.
6. Check to make sure the wires in the cable are attached to the appropriate pins in
the RJ-45 connector.