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    MX960 Acoustic Cover Installation Instructions

    This document describes how to remove and replace the acoustic noise covers on a Juniper Networks MX960 3D Universal Edge Router. The upper fan tray cover and DPC cover make up the acoustic noise components. The two acoustic covers are designed to reduce the system sound level to comply with the Network Equipment Building System (NEBS). The covers and all associated mounting hardware are available as an optional upgrade kit.

    Tools required:

    • Number 2 Phillips screwdriver
    • 7/16” wrench

    Table 1: Parts List for Acoustic Noise Cover Kit

    Component

    Quantity

    12–24 1 1/4 in. screws

    4

    12–24 nylon lock nuts

    4

    Star washer

    1

    Card cage cover mounting bracket

    2

    Upper fan tray cover

    1

    DPC Card cage cove

    1

    Installing the Upper Fan Tray Cover

    The upper fan tray cover is installed below the craft interface and covers the upper fan tray. To install the upper fan tray cover, use the following procedure (see Figure 1).

    Note: The upper fan tray cover obstructs the existing electrostatic discharge (ESD) jack located above the upper fan tray on the front of the chassis. A second ESD jack is located on the lower rear of the chassis. An optional ESD jack has been provided in the installation kit and may be installed in an available rack mounting hole. Ensure that the mounting surface is conductive and free of paint. Secure the optional ESD jack with the star washer and nut provided in the installation kit.

    1. Before placing the cover onto the router, rotate the latch knobs counterclockwise until they stop turning. This will ensure that the latch is open enough to hook behind the lip of the fan tray.
    2. Place the cover over the upper fan tray.
    3. Secure the lip of the cover in the groove directly below the craft interface.
    4. Rotate the latch knobs clockwise, and hand tighten them until they are secure.

      Figure 1: Upper Fan Tray Cover and Optional ESD Grounding Jack

      Upper Fan Tray Cover and
Optional ESD Grounding Jack

    Installing the DPC Card Cage Cover Center-Mount Brackets

    The DPC card cage cover is installed directly over the DPC Card cage. The installation of the brackets depends on whether the router is center or front mounted.

    To install the center-mount brackets for the DPC card cage cover on routers that are center mounted, use the following procedure (see Figure 2).

    1. Locate the tab on the rear surface of the mounting bracket.
    2. Place the rear surface of the bracket against the mounting flange. Vertical alignment is correct when the tab rests on top of the flange.
    3. Locate the highest available mounting hole on the bracket and insert the first screw through the bracket and flange. Secure it with a nylock nut.
    4. Locate the lowest available mounting hole on the bracket and insert the second screw through the bracket and flange. Secure it with a nylock nut.
    5. Use a screwdriver and a wrench to hand tighten the screws and nylock nuts. Do not overtighten the screws. Overtightening may cause damage to the plastic bracket.
    6. Repeat the above steps with the second bracket.

    Figure 2: Installing the DPC Card Cage Cover

    Installing the DPC Card
Cage Cover

    Installing the DPC Card Cage Cover Front-Mount Brackets

    To install the brackets for the DPC card cage cover on routers that are front-mounted, use the following procedure:

    1. Locate the tab on the rear surface of the mounting bracket.
    2. Place the rear surface of the bracket against the mounting flange. Vertical alignment is correct when the tab rests on top of the flange.
    3. Locate the highest available mounting hole on the bracket and insert the first screw through the bracket and threaded rack flange.
    4. Locate the lowest available mounting hole on the bracket and insert the second screw through the bracket and threaded rack flange.
    5. Use a screwdriver to hand tighten the screw . Do not overtighten the screws; overtightening may cause damage to the plastic bracket.
    6. Repeat the above steps with the second bracket.

    Installing the DPC Card Cage Cover

    To install the DPC card cage cover, use the following procedure (see Figure 2).

    1. Look through the front of the cover and align the four hooks on either side of the acoustic cover with the rail slots on the outside of the card cage.
    2. Slide the cover into the rail slots.
    3. Gently push the cover down to secure it in place.

    Removing the Upper Fan Tray Cover

    The upper fan tray cover is installed below the craft interface and covers the upper fan tray. To remove the upper fan tray cover, use the following procedure (see Figure 1).

    1. Rotate the latch knobs counterclockwise until the cover is released or until the knobs stop turning.
    2. Remove the cover.

    Removing the DPC Card Cage Cover

    To remove the DPC card cage cover, use the following procedure (see Figure 3).

    1. Press the cover catch release area marked with the instruction label on each side of the cover.
    2. Slide the cover up until it stops; then pull the cover toward you to remove.

      Figure 3: Removing the DPC Card Cage Cover

      Removing the DPC
Card Cage Cover

    Published: 2014-03-25