Installing The T4000 Mounting Hardware For An Open-Frame Rack; Installing The Cage Nuts, If Needed; Installing The Large Mounting Shelf; Table 76: Open-Frame Rack Mounting Hole Locations - Juniper T4000 Hardware Manual

Installing the T4000 Mounting Hardware for an Open-Frame Rack

Installing the Cage Nuts, if Needed

Installing the Large Mounting Shelf

Copyright © 2018, Juniper Networks, Inc.
In an open-frame rack, center-mounting is generally preferable to front-mounting because
the more even distribution of weight provides greater stability. If you center-mount the
chassis, you use the center-mounting brackets attached to the chassis. If you front-mount
the chassis, you use the front-mounting flanges, and must remove the center-mounting
brackets.
1. Installing the Cage Nuts, if Needed on page 133
Installing the Large Mounting Shelf on page 133
2.
Removing the Center-Mounting Brackets from the Chassis on page 134
3.
Removing the Spacer Bars on page 135
4.
Check that cage nuts are installed in the mounting holes specified in
1.
Table 76 on page 133.
Install cage nuts, if needed.
2.
Table 76 on page 133 specifies the mounting holes in which you insert the mounting screws
(an X indicates a mounting hole location), and cage nuts if needed. 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 76: Open-Frame Rack Mounting Hole Locations

Hole Distance Above U Division
59 34.13 in. (86.7 cm)
53 30.63 in. (77.8 cm)
50 28.88 in. (73.3 cm)
44 25.38 in. (64.5 cm)
41 23.63 in. (60.0 cm)
35 20.13 in. (51.1 cm)
32 18.38 in. (46.7 cm)
31 17.75 in. (45.1 cm)
To install the large mounting shelf (see
Chapter 16: Installing the Mounting Hardware
19.50 U
17.50 U
16.50 U
14.50 U
13.50 U
11.50 U
10.50 U
10.14 U
Figure 34 on page 134) in an open-frame rack:
Large Shelf
X
X
X
X
X
X
X
X
133