Installing the M320 Mounting Hardware for a Four-Post Rack or Cabinet

To prepare to install the M320 router in a four-post rack or cabinet, you install the large shelf and the spacer bars on the front rail, and the small mounting shelf on the rear rail (see Figure 1. You also remove the adjustable center-mounting brackets from the chassis.

1. Installing Cage Nuts (If Needed) for M320 Four-Post Racks or Cabinets
2. Installing the Large Mounting Shelf for M320 Four-Post Racks or Cabinets
3. Installing the Small Mounting Shelf for M320 Four-Post Racks or Cabinets
4. Removing the Adjustable Center-Mounting Brackets for M320 Four-Post Racks or Cabinets

Installing Cage Nuts (If Needed) for M320 Four-Post Racks or Cabinets

For racks without threaded holes, you must install cage nuts in the locations specified in Table 1. To install the cage nuts:

1. On the front rack rails, install cage nuts in the holes specified for the large shelf and the spacer bars.
2. On the rear rack rails, install cage nuts in the holes specified for the small shelf.

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.

Installing the Large Mounting Shelf for M320 Four-Post Racks or Cabinets

To install the large mounting shelf:

1. On the front of each front rack rail, partially insert a mounting screw into the lowest hole.
2. Install the large shelf on the front rack rails. Rest the bottom slot of each flange on a mounting screw.
3. Partially insert a mounting screw into the top hole in each flange of the large shelf.
4. Tighten all the screws completely.
5. The router is shipped with each spacer bar attached to the rear of each front-mounting flange. Remove each spacer bar by removing the seven screws that fasten the spacer bar to the front-mounting flange.
6. Place one of the spacer bars over an flange of the installed 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.
7. Insert a mounting screw into each of the nonthreaded holes in the recesses of the spacer bar to secure the spacer bar.
8. Repeat Steps 6 and 7 for the other spacer bar.
9. Tighten all the screws completely.

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

Installing the Small Mounting Shelf for M320 Four-Post Racks or Cabinets

1. On the back of each rear rack rail, partially insert a mounting screw into the lowest hole.
2. 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 should align with the bottom of the large shelf.
3. Partially insert screws into the open holes in the flanges of the small shelf.
4. Tighten all the screws completely.

Removing the Adjustable Center-Mounting Brackets for M320 Four-Post Racks or Cabinets

Two adjustable center-mounting brackets attached to the center of the chassis (in the mounting holes closest to the rear of the chassis). but are needed only for center-mounting in an open-frame rack. Before installing the M320 router in a four-post rack or cabinet, you must remove the adjustable center-mounting brackets.

To remove the adjustable center-mounting brackets:

1. Loosen the three screws at the top and bottom of each bracket (see Figure 2).
2. Remove the center-mounting bracket.

Figure 2: Center-Mounting Bracket Removal