Specifications

1-7
Cisco ONS 15454 Installation and Operations Guide, R3.2
January 2005
Chapter 1 Hardware Installation
Rack Installation
The shelf assembly comes preset for installation in a 23-inch rack, but you can reverse the mounting
bracket to fit the smaller, 19-inch rack. The following steps describe how to reverse the shelf assembly
mounting bracket to fit a 19-inch rack.
Procedure: Reverse the Mounting Bracket to Fit a 19-Inch Rack
Step 1 Remove the screws that attach the mounting bracket to the side of the shelf assembly.
Step 2 Flip the detached mounting bracket upside down.
Text imprinted on the mounting bracket will now also be upside down.
Step 3 Place the widest side of the mounting bracket flush against the shelf assembly (see Figure 1-2).
The narrow side of the mounting bracket should be towards the front of the shelf assembly. Text
imprinted on the mounting bracket should be visible and upside down.
Step 4 Align the mounting bracket screw holes against the shelf assembly screw holes.
Step 5 Insert the screws that were removed in Step 1 and tighten them.
Step 6 Repeat the procedure for the mounting bracket on the opposite side.
Figure 1-2 Reversing the mounting brackets (23-inch position to 19-inch position)
1.3.2 Mounting a Single Node
Mounting the ONS 15454 in a rack requires a minimum of 18.5 inches of vertical rack space (and one
inch for air flow). To ensure the mounting is secure, use two to four #12-24 mounting screws for each
side of the shelf assembly. Figure 1-3 shows the rack mounting position for the ONS 15454.
Top of unit Side of unit
Top of unit
. (482.6 mm) position
23 in. (584.2 mm)
mounting holes
. (584.2 mm) position
47869
Mounting
L brackets
Mounting
L brackets
Rear
Front
19 in. (482.6 mm)
mounting holes