D-Link DES-3010F Manual page 21

At the front of the Switch to the right is the slot for the optional module, as shown in Figure 2-7 and Figure 2-8. This slot
should be covered with a faceplate that can be easily removed by loosening the screws and pulling off the plate.
Take the module and gently slide it in to the available slot at the front of the Switch until it reaches the back, as shown in
the following figure. At the back of the slot is a plug that must be connected to the module. Gently, but firmly push in on
the module to secure it to the Switch. The module should fit snugly into the corresponding receptor.
The upgraded DES-3018 / DES-3026 is now ready for use.
DES-3010F/G / DES-3018 / DES-3026 Fast Ethernet Switch Manual
CAUTION: Before adding the optional module, make sure to disconnect all
power sources connected to the Switch. Failure to do so may result in an
electrical shock, which may cause damage, not only to the individual but to
the Switch as well.
Figure 2- 7. Optional Module slots at the front of the DES-3018
Figure 2- 8. Optional Module slot at the front of the DES-3026
Figure 2- 9. Inserting the optional module into the Switch.
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Optional Module Slots
Optional Module Slots