Technical Documentation

Installing the T1600 Mounting Hardware for a Four-Post Rack or Cabinet

Installing Cage Nuts, If Needed

To install the cage nuts, if needed, in the mounting holes specified in Table 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.

The front-mounting flanges have holes for rack-mounting screws, spaced at 5.25 in. (13.34 cm). Table 1 specifies the holes in which you insert 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. The bottom of all mounting shelves is at 0.04 in. (0.02 U) above a “U” division.

Table 1: Four-Post or Cabinet Rack Mounting Hole Locations

Hole	Distance Above “U” Division		Large Shelf	Spacer Bars	Small Shelf
60	34.75 in. (88.3 cm)	19.86 U		X
51	29.51 in. (74.9 cm)	16.86 U		X
42	24.26 in. (61.6 cm)	13.86 U		X
33	19.01 in. (48.3 cm)	10.86 U		X
24	13.76 in. (34.9 cm)	7.86 U		X
15	8.51 in. (21.6 cm)	4.86 U		X	X
12	6.76 in. (17.1 cm)	3.86 U			X
9	5.01 in. (12.7 cm)	2.86 U			X
6	3.26 in. (8.3 cm)	1.86 U		X	X
3	1.51 in. (3.8 cm)	0.86 U			X
2	0.88 in. (2.2 cm)	0.50 U	X

Installing the Large Mounting Shelf

To install the large mounting shelf:

On the front of each front rack rail, partially insert a mounting screw into the lowest hole specified in Table 1 for the large shelf and the spacer bars.
Install the large shelf on the front rack rails. Rest the bottom slot of each flange on a mounting screw.
Partially insert a mounting screw into the top hole in each flange of the large shelf.
Tighten all the screws completely.

Figure 1: Installing the Mounting Hardware for a Four-Post Rack or Cabinet

Installing the Small Shelf

To install the small shelf:

On the back of each rear rack rail, partially insert a mounting screw into the lowest hole specified in Table 1 for the small shelf.
Install the small shelf on the back rack rails. Rest the bottom slot of each flange on a mounting screw. The small shelf installs on the back of the rear rails, extending toward the center of the rack. The bottom of the small shelf on the rear rack rails must align with the bottom of the large shelf on the front rack rails.
Partially insert screws into the open holes in the flanges of the small shelf.
Tighten all the screws completely.

Installing the Spacer Bars

The router is shipped with each spacer bar attached to the rear of each front-mounting flange.

To install the spacer bars:

Remove each spacer bar by removing the screws that fasten the spacer bar to the front-mounting flange.
Place one of the spacer bars over a flange of the large shelf. Position the 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 Figure 2).
Insert a mounting screw into each of the nonthreaded holes in the recesses of the spacer bar to secure the spacer bar. Each hole should have a cage nut behind it.
Repeat Steps 2 and 3 for the other spacer bar.
Tighten all the screws completely.

Figure 2: Positioning the Spacer Bar on the Rack

Removing the Center-Mounting Brackets from the Chassis

You must remove the center-mounting brackets before installing the chassis in a four-post rack or cabinet.

To remove the center-mounting brackets (see Figure 3):

Loosen the screws at the top and bottom of each bracket.
Remove each bracket.

Figure 3: Removing the Center-Mounting Bracket

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