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Cisco 860 Series, Cisco 880 Series, and Cisco 890 Series Integrated Services Routers Hardware Installation Guide
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Chapter 3      Connecting the Router
  Installing the 3G Adapter for Extended Cable/Antenna
Step 2 Locate the hooks on the adapter as shown in Figure 3-15.
Figure 3-15 Locating the Hooks on the Adapter
Step 3
Align and insert the hooks of the adapter into the air vent holes on the left side router body as shown in 
Figure 3-16.
Figure 3-16 Inserting the Hooks
1 Hooks on the adapter 
1 Hooks aligned and inserted into the router.