D-Link 809TC - Hub - EN User Manual page 21

10BASE-T Ethernet Mini Hubs User's Guide
Note that, for Mini Hub model DE-809TP, UTP port labeled "9"
must be in the Normal position in order to be connectable to a
station, bridge or router. To connect this port to a UTP port of a
10BASE-T hub, the port must be in the Uplink position (see section
Cascading Hubs Through UTP Cable in this chapter for details).
The button to the right of the UTP port labeled "9" is used to switch
between the Normal and the Uplink position.
Installation 9