Installing the T4000 Mounting Hardware for an Open-Frame Rack
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.
Installing the Cage Nuts, if Needed
- Check that cage nuts are installed in the mounting holes specified in Table 1.
- Install cage nuts, if needed.
Table 1 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 1: Open-Frame Rack Mounting Hole Locations
Hole | Distance Above U Division | Large Shelf | |
|---|---|---|---|
59 | 34.13 in. (86.7 cm) | 19.50 U | X |
53 | 30.63 in. (77.8 cm) | 17.50 U | X |
50 | 28.88 in. (73.3 cm) | 16.50 U | X |
44 | 25.38 in. (64.5 cm) | 14.50 U | X |
41 | 23.63 in. (60.0 cm) | 13.50 U | X |
35 | 20.13 in. (51.1 cm) | 11.50 U | X |
32 | 18.38 in. (46.7 cm) | 10.50 U | X |
31 | 17.75 in. (45.1 cm) | 10.14 U | X |
Installing the Large Mounting Shelf
To install the large mounting shelf (see Figure 1) in an open-frame rack:
- On the rear of each rack rail, partially insert a mounting screw into the lowest hole specified in Table 1 for the large shelf.
- Install the large shelf on the rack. Rest the bottom slot of each flange on a mounting screw.
- Partially insert screws into the open holes in the flanges of the large shelf.
- Tighten all the screws completely.
Removing the Center-Mounting Brackets from the Chassis
Before front-mounting the router in an open-frame rack, you must remove the center-mounting brackets from the chassis.
To remove the center-mounting brackets (see Figure 2):
- Loosen the screws at the top and bottom of each bracket.
- Remove each bracket.
Removing the Spacer Bars
The router is shipped with each spacer bar attached to the rear of each front-mounting flange. If you are installing the chassis in an open-frame rack, removing the spacer bars is optional.
To remove the spacer bars:
- Remove the screws that fasten the spacer bar to the front-mounting flange
- Remove the spacer bars.