Cisco 3900 series

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Cisco 2900 and 3900 Series Hardware Installation
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Chapter 3 Installing and Connecting the Router
Chassis Grounding
Figure 3-18 NEBS-Compliant Chassis Ground Connection on Cisco 2921 or Cisco 2951 Chassis
Figure 3-19 Chassis Ground Connection on Cisco 3900 Series Chassis
Step 4 Connect the other end of the ground wire to a known reliable earth ground point at your site.
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