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Mount a QFX5120-48T, QFX5120-48Y, or QFX5120-48YM Switch in a Recessed Position from the Front Posts of a Rack or Cabinet

 

You can mount a QFX5120 switch on four posts of a four-post 19-in. rack or in a cabinet that contains a four-post 19-in. rack, flush with the front posts, by using a four-post rack mount kit. (The remainder of this topic uses rack to mean rack or cabinet.) You can mount QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches in a recessed position inside a four-post rack by using the recessed mounting brackets. You can also mount QFX5120-48YM switches on a two-post rack by using a separately orderable two-post rack mount kit.

This topic describes the procedure to mount QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches in a recessed position from the front posts of a four-post rack. If you want to mount the switch flush with the front posts of a four-post rack, see Mount a QFX5120-48T, QFX5120-48Y, or QFX5120-48YM Switch Flush with the Front Posts of a Rack or Cabinet. If you want to mount a QFX5120-48YM switch on a two-post rack, see Mount a QFX5120-48YM Switch on a Two-Post Rack.

Note

The protective earthing terminal on QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches mounted in a recessed position from the front posts of a rack is accessible through the slot on the left rear bracket only if the distance between the front posts and the rear posts is 25 in. (63.5 cm) through 32.25 in. (81.9 cm).

Before you mount a QFX5120-48T, QFX5120-48Y, or QFX5120-48YM switch:

Ensure that you have the following parts and tools available:

  • Number 2 Phillips (+) screwdriver—not provided

  • Eight screws to secure the mounting brackets to the rack—not provided

  • Electrostatic discharge (ESD) grounding strap—not provided

  • Front mounting bracket assembly for mounting the switch flush with the front posts of a rack—2 (provided with the four-post rack mount kit)

    (The front mounting bracket assembly is made up of a side rail to which an L-shaped bracket is attached.)

  • Flat head 4x6-mm Phillips screws for attaching the front mounting brackets to the chassis—12 (provided with the four-post rack mount kit)

  • Rear mounting brackets—2 (provided with the four-post rack mount kit)

  • Recessed mounting brackets for mounting the switch in a recessed position from the front posts of a rack—2 (provided with the four-post rack mount kit)

  • Flat head 4-40 Phillips screws for attaching the recessed mounting brackets to the side rails—6 (provided with the four-post rack mount kit)

Note

One person must be available to lift the switch while another person secures the switch to the rack.

Caution

If you are mounting multiple units on a rack, mount the heaviest unit at the bottom of the rack, and then mount the other units from the bottom of the rack to the top in decreasing order of the weight of the units.

To mount a QFX5120-48T, QFX5120-48Y, or QFX5120-48YM switch in a recessed position from the front posts of a four-post rack:

  1. Place the switch on a flat, stable surface.
  2. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end of the strap to a site ESD point.
  3. Unscrew and detach the L-shaped bracket from the side rail in the front mounting bracket assembly provided with the four-post rack mount kit (see Figure 1).
    Figure 1: Unscrew and Detach the L-Shaped Bracket from the Side Rail
    Unscrew and Detach the L-Shaped Bracket from the Side Rail
      1
    Side rail
      2
    L-shaped bracket
  4. Attach the recessed mounting brackets provided with the four-post rack mount kit to the side rails by using the flat head 4-40 Phillips screws provided with the four-post rack mount kit (see Figure 2).
    Figure 2: Attach the Recessed Mounting Bracket to the Side Rail
    Attach the
Recessed Mounting Bracket to the Side Rail
      1
    Side rail
      2
    Recessed mounting bracket
  5. Align the recessed mounting bracket assembly along the side panel of the switch.
  6. Insert the flat head 4x6-mm Phillips screws for attaching the recess mounting bracket assembly (provided with the four-post rack mount kit) into the aligned holes on the chassis (see Figure 3, Figure 4, and Figure 5). Tighten the screws.
    Figure 3: Attach the Recessed Mounting Bracket Assembly to the QFX5120-48T Switch Chassis
    Attach the
Recessed Mounting Bracket Assembly to the QFX5120-48T Switch Chassis
    Figure 4: Attach the Recessed Mounting Bracket Assembly to the QFX5120-48Y Switch Chassis
    Attach the
Recessed Mounting Bracket Assembly to the QFX5120-48Y Switch Chassis
    Figure 5: Attach the Recessed Mounting Bracket Assembly to the QFX5120-48YM Switch Chassis
    Attach
the Recessed Mounting Bracket Assembly to the QFX5120-48YM Switch
Chassis
  7. Decide which end of the switch you want to place at the front of the rack. Position the switch so that the AIR IN labels on the fan modules are facing the cold aisle, or the AIR OUT labels on the fan modules are facing the hot aisle.
  8. Have one person grasp both sides of the switch, lift the switch, and position it in the rack, aligning the holes of the mounting brackets with the threaded holes in the front post of the rack. Align the bottom hole in both the mounting brackets with a hole in each rack rail, making sure that the chassis is level.
  9. Have a second person secure the front of the switch to the rack by using the screws appropriate for your rack. Tighten the screws (see Figure 6, Figure 7, and Figure 8).
    Figure 6: Secure the QFX5120-48T Switch to the Front Posts of a Rack
    Secure the
QFX5120-48T Switch to the Front Posts of a Rack
    Figure 7: Secure the QFX5120-48Y Switch to the Front Posts of a Rack
    Secure the
QFX5120-48Y Switch to the Front Posts of a Rack
    Figure 8: Secure the QFX5120-48YM Switch to the Front Posts of a Rack
    Secure the
QFX5120-48YM Switch to the Front Posts of a Rack
  10. Slide the rear mounting bracket blades into the side rails of the recess mounting bracket assembly attached to the switch chassis (see Figure 9, Figure 10, and Figure 11).
  11. Ensure that the chassis is level. Align the holes of the rear mounting brackets with the threaded holes in the rear post of the rack. Align the bottom hole in both the mounting brackets with a hole in each rack rail. Align the bottom hole in both the rear mounting brackets with the bottom hole in the front mounting brackets.
  12. Secure the rear mounting brackets to the rear post of the rack by using screws appropriate for your rack (see Figure 9, Figure 10, and Figure 11).
    Figure 9: Secure the QFX5120-48T Switch to the Rear Post of the Rack by Using the Rear Mounting Brackets
    Secure the QFX5120-48T Switch to the Rear Post of the Rack by Using
the Rear Mounting Brackets
    Figure 10: Secure the QFX5120-48Y Switch to the Rear Post of the Rack by Using the Rear Mounting Brackets
    Secure the QFX5120-48Y Switch to the Rear Post of the Rack by Using
the Rear Mounting Brackets
    Figure 11: Secure the QFX5120-48YM Switch to the Rear Post of the Rack by Using the Rear Mounting Brackets
    Secure the QFX5120-48YM Switch to the Rear Post of the Rack by Using
the Rear Mounting Brackets

    Your switch is now installed on a four-post rack.