3Com SuperStack II 10005622 Getting Started Manual page 24

2-4 C 2: I
HAPTER NSTALLING THE
To find the top of the pattern, locate the midpoint
between any two holes that are spaced
Figure 2-3 shows the universal mounting hole
pattern.
Top of the pattern
or top of the rack
Universal
mounting
hole pattern
= 1U
= 1 3/4 inches
Bottom of the pattern
Figure 2-3 Universal Mounting Hole Pattern
Determine which holes to use to mount your system.
4
Two Switch 3900s are designed to mount in any 3U
space of the rack (that is, the space occupied by three
instances of the universal mounting hole pattern).
S
YSTEM
1
/ inch apart.
2
1/2"
5/8"
1U
5/8"
1/2"
5/8"
1U
5/8"
1/2"
5/8"
1U
5/8"
1/2"
Figure 2-4 illustrates the positions of two Switch
3900s, one attached to holes 1 and 4 and the other
attached to holes 6 and 9.
To mount only one Switch 3900, use either position.
Placement of
Switch 3900
(position 1)
3U
(5.25")
Placement of
Switch 3900
(position 2)
Figure 2-4 Placement of Switch 3900s in a Distribution Rack
Repeat the process on the other rail.
5
Be sure to select holes that are parallel to each other
on the mounting rails.
Hole 1
Hole 3
Hole 6
Hole 8