Installing The Mounting Hardware For A Front-Mount Open-Frame Rack; Figure 29: Installing The M120 Mounting Hardware For A Four-Post Rack Or; Table 66: Open-Frame Rack Mounting Hole Locations For The M120 Router - Juniper M120 Hardware Manual

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Installing the Mounting Hardware for a Front-Mount Open-Frame Rack

Copyright © 2018, Juniper Networks, Inc.
Figure 29: Installing the M120 Mounting Hardware for a Four-Post Rack or Cabinet
M120 Rack Mounting Requirements on page 83
M120 Site Preparation Checklist on page 81
Installation Safety Warnings for Juniper Networks Devices on page 322
If you are installing the router in a front-mount open-frame rack, you must first install
the large mounting shelf on the rack and remove the mounting brackets from the chassis.
The small mounting shelf and the spacer bars are not needed.
Table 66 on page 121 specifies the holes in which you insert screws to install the mounting
hardware in an open-frame rack (an X indicates a mounting hole location). The hole
distances are relative to one of the standard U divisions on the rack. For reference, the
bottom of all mounting shelves is at 0.04 in. (0.02 U) above a U division.

Table 66: Open-Frame Rack Mounting Hole Locations for the M120 Router

Hole Distance Above U Division
30 17.26 in. (43.8 cm)
Chapter 16: Installing the Mounting Hardware
Large Shelf
9.86 U X
121