AT&T Merlin II Feature Module 2 Installation Ans Getting Started Manual page 19

The Expansion Slots
Once you removed the cover from your PC, you are ready to insert the CMS
expansion card.
In your PC there are seven expansion slots (Figure 4). At the front of the PC
there's a plastic guide aligned with each expansion slot. The CMS expansion
card must fit into an expansion slot receptacle and its corresponding plastic
guide.
FIGURE 4 The expansion slots in the PC.
Plastic guide
Expansion Slots
14 3:
Step lnstalling Your Hardware