D-Link DES-1008M - Manual (Page 34)

DES-1008M User’s Guide
24 Making Network Connections
4. Remove the protective covers from the connectors of the selected
port.
5. Using the fiber cable, connect the Rx connector of the selected port
to the Tx connector of the node. Then, connect the Tx connector of
the port to the Rx connector of the node.
6. Repeat the same procedure to connect the other nodes.