Cisco ASR 920 series

Figure 2: Shows how to attach the brackets on the Cisco ASR 920 Series Router for a 23-inch cabinet.
Figure 3: Attaching Mounting Brackets for a 23-inch Cabinet (Front, Middle, and Rear Positions)
Cisco ASR 920 Series Aggregation Services Router Hardware Installation Guide
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Installing the Cisco ASR 920 Series Router
Installing the Chassis Brackets