D-Link DES-1008M User Manual page 32

DES-1008M User's Guide
You may also use a 50-ohm BNC terminator if you wish. However, only
one of these termination methods can be used at a time.
6. Repeat the same procedure to connect the other nodes.
For information about the indicators on the slide-in port modules, see
Appendix C, Slide-in Port Modules.
22 Making Network Connections