D-Link DSS-24+ Manual page 11

After removing the plain bracket, slide the module in the guide
rails all the way into the slot and secure the screws.
When properly installed, the Slot LED will be lit after powering on
the Switch (see Chapter 3 for more information about LEDs,
including a diagram).
Note: Always remember to turn off the power before a module is
inserted or removed.
Figure 2.4 Removing the plain bracket
Figure 2.5 Sliding the module into position
10/100 Fast Ethernet Switch Manual
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