CHAPTER 16
Installing the Mounting Hardware
•
Installing the Mounting Hardware for a Front-Mount Four-Post Rack or
Cabinet on page 119
•
Installing the Mounting Hardware for a Front-Mount Open-Frame Rack on page 121
•
Installing the Mounting Hardware for a Center-Mount Open-Frame Rack on page 123
Installing the Mounting Hardware for a Front-Mount Four-Post Rack or Cabinet
If you are installing the router in a front-mount four-post rack or cabinet, you must first
install the large mounting shelf, followed by the small mounting shelf and then the spacer
bars on the rack. In addition, you must remove the mounting brackets from the chassis.
Table 65 on page 119 specifies the holes in which you insert cage nuts and screws to install
the mounting hardware required in a four-post or cabinet rack (an X indicates a mounting
hole location). The hole distances are relative to one of the standard U divisions on the
rack. The bottom of all mounting shelves is at 0.04 in. (0.02 U) above a U division.
Table 65: Four-Post Rack or Cabinet Mounting Hole Locations for the M120 Router
Small
Shelf
Spacer
Bars
Large
ShelfDistance Above U DivisionHole
X8.86 U15.5 in. (39.4 cm)27
X6.86 U12.0 in. (30.5 cm)21
X3.86 U6.75 in. (17.1 cm)12
X1.86 U3.25 in. (8.3 cm)6
X0.86 U1.51 in. (3.8 cm)3
XX0.50 U0.88 in. (2.2 cm)2
X0.14 U0.25 in. (0.6 cm)1
To install the mounting shelves and spacer bars (see Figure 29 on page 121):
119Copyright © 2018, Juniper Networks, Inc.
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