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Cisco Integrated Services Router Hardware Installation Guide
 
Chapter 3      Connecting the Router
  Cisco 860, 880, 890 Series
Step 3 Slide the opened locking bracket under the 3G card. The locking bracket should align with the notches 
on either side of the 3G card, as shown in Figure 3-15, and the pins on the locking bracket should be 
inserted into the corresponding holes in the router. 
Figure 3-15 Installing the Locking Bracket
1 3G card 3 Notch on the 3G card
2 Locking bracket