Juniper T640 Hardware Manual page 126

T640 Core Router Hardware Guide
94
Table 39: T640 Four-Post or Cabinet Rack Mounting Hole
Locations (continued)
Hole Distance Above U Division
15 8.51 in. (21.6 cm)
12 6.76 in. (17.1 cm)
9 5.01 in. (12.7 cm)
6 3.26 in. (8.3 cm)
3 1.51 in. (3.8 cm)
2 0.88 in. (2.2 cm)
To install the mounting shelves and spacer bars:
Install cage nuts, if needed, in the mounting holes specified in
1.
On the front rack rails, install cage nuts in the holes specified for the large shelf and
the spacer bars.
On the rear rack rails, install cage nuts in the holes specified for the small shelf.
On the front of each front rack rail, partially insert a mounting screw into the lowest
2.
hole specified in Table 39 on page 93
Install the large shelf on the front rack rails. Rest the bottom slot of each flange on a
3.
mounting screw.
Tighten all the screws completely.
4.
The router is shipped with each spacer bar attached to the rear of each front-mounting
5.
flange. Remove each spacer bar by removing the screws that fasten the spacer bar
to the front-mounting flange.
Figure 4 on page 14 shows the front-mounting flanges.
Place one of the spacer bars over a flange of the installed large shelf. Position the
6.
notch in the rear of the spacer bar so the upper part of the bar is flush with the rack
rail and the lower part is flush with the flange of the shelf (see
Insert a mounting screw into each of the nonthreaded holes in the recesses of the
7.
spacer bar to secure the spacer bar. Each hole should have a cage nut behind it.
Repeat Steps 6 and 7 for the other spacer bar.
8.
Tighten all the screws completely.
9.
On the back of each rear rack rail, partially insert a mounting screw into the lowest
10.
hole specified in Table 39 on page 93
Large
Shelf
4.86 U
3.86 U
2.86 U
1.86 U
0.86 U
0.50 U X
for the large shelf and the spacer bars.
for the small shelf.
Copyright © 2013, Juniper Networks, Inc.
Spacer Small
Bars Shelf
X X
X
X
X X
X
Table 39 on page 93:
Figure 54 on page 95).