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Fast Track to Rack Installation and Power

This procedure guides you through the steps to install your MX2008 router in a four-post rack or cabinet using a router transport kit, and connect it to AC power.

Install the MX2008 Router for a Rack or Cabinet

The MX2008 Universal Routing Platform with standard cable managers and EMI cover measures 42in. (106.68cm) high, 19in. (48.26cm) wide, and 30.90in. (78.49cm) deep (from the front-mounting flanges to the rear of the chassis). An extended cable manager extends the total depth to 36.82in. (93.53cm). One router can be installed in a 24-U or taller open-frame or four-post rack if the rack can support the combined weight, which can be greater than 664.8lb (301.55kg).

The MX2008 router is 24-U tall. The MX2008 router has 10 dedicated line-card slots, which means a maximum of 10 Modular Port Concentrators (MPCs) including Adapter cards and Modular Interface Cards (MICs) can be installed on MX2008. ADCs provide housing to MPCs. The MPCs attach to the adapter cards, which in 1 turn connect to the backplane. Up to 2 MICs can be installed in each MPC.

Fully populated, the MX2008 router supports up to 20 MICs. The MX2008 host subsystem consists of two Routing and Control Boards (RCBs). The RCB is an integrated board and a single FRU that provides Routing Engine and Control Board functionality and supports virtualization. The router contains 8 SFBs that provide 7+1 redundancy.

We'll walk you through the steps to install the router in a four-post rack or cabinet.

Figure 1: MX2008 Rack Clearance and Router Dimensions for Four-Post Rack Installation Technical drawing of a server rack with dimensions labeled in inches and centimeters; 42.00 high, 19.00 wide, 30.90 deep.

Before you install, review the following:

CAUTION:

When mounting the router in a partially filled rack, load the rack from the bottom to the top with the heaviest component at the bottom of the rack.
CAUTION:

Before mounting the router in a rack, have a qualified technician verify that the rack is strong enough to support the router's weight and is adequately supported at the installation site.

Mount the router

To connect the MX2020 router to a four-post rack using a router transport kit (model number MX2K-TRNSPRT-KIT):

  1. Slide the four-post rack mounting shelf between the rack rails, resting the bottom of the shelf on the rack supports. The four-post rack mounting shelf installs on the rear rack rails, extending toward the front of the rack.

    Note:

    There must be a minimum of 45-U unobstructed front-to-back usable rack space when installing the MX2020 router into a four-post rack or cabinet.

  2. Partially insert screws into the open holes in the front ears of the four-post rack mounting shelf.

  3. Tighten all the screws completely.

  4. On the front of the rear rack rails, partially insert screws into the holes in each ear of the four-post rack mounting shelf.

    Figure 2: Mounting Hardware for a Four-Post Rack or Cabinet Mounting Hardware for a Four-Post Rack or Cabinet

  5. Tighten all the screws completely.

    Note:

    • The two rear flanges on the four-post mounting shelf are adjustable from 24 in. (60.96 cm) through 30 in. (76.2 cm) to accommodate different types of racks rails.

    • There must be a minimum of 24-U unobstructed front-to-back usable rack space when installing the MX2008 router into a four-post rack or cabinet.
  6. Remove the center-mounting brackets. The center-mounting brackets are not used for a four-post rack, and must be removed from the chassis:

    1. Loosen the screws from each bracket.

      Figure 3: Center-Mounting Bracket Removal Center-Mounting Bracket Removal

    2. Remove each bracket.

  7. Install the Router Transport Kit. See Installing the Router Transport Kit.

  8. Take each component out of its electrostatic bag, and identify the slot on the component where it will be connected.

    Note:

    Remove the shipping covers before installing router components.

  9. Slide each component into the chassis evenly so that it does not become stuck or damaged.

  10. Tighten the captive screws, and secure all levers for each component.

    Note:

    Make sure that all empty slots are covered with a blank panel before operating the router.

Connect to Power

The MX2008 routers supports a three-phase delta AC power system, three-phase wye AC power system, or a single-phase AC power system. The MX2008 routers are available in -48 V and 240 V China DC power configurations, three-phase (delta and wye) AC power configurations, single-phase power configurations, and high-voltage AC (HVAC) or high-voltage DC (HVDC) configurations. You can add additional power to the rack as needed.

In this section, we show you how to connect to power using a three-phase delta AC power distribution module.

CAUTION:

Do not mix AC, DC, 240 V China, or universal (HVAC/HVDC) PSMs or different PDM types within a single system. The MX2000 line of routers configured for three-phase wye AC input power must use only three-phase wye AC PDMs and threephase AC PSMs. The systems configured for three-phase delta AC input power must use only three-phase delta AC PDMs and AC PSMs. The systems configured for singlephase AC input power must use only single phase AC PDMS and AC PSMs. The 49 systems configured for universal (HVAC/HVDC) input power must use universal (HVAC/HVDC) PDMs and universal PSMs.

Ground the MX2008 Router

You ground the router by connecting a grounding cable to earth ground and then attaching it to the chassis grounding points by using two screws. To connect the grounding cable:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.

  2. Ensure that all grounding surfaces are clean and brought to a bright finish before you make grounding connections.

  3. Connect the grounding cable to a proper earth ground.

  4. Verify that a licensed electrician has attached the cable lug provided with the router to the grounding cable.

  5. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.

  6. Place the grounding cable lug over one of the grounding points on the rear of the chassis. The upper pair is sized for UNC 1/4-20 nuts, and the lower pair is sized for M6 nuts.

  7. Secure the grounding cable lug to the grounding points, first with the washers, and then with the nuts.

  8. Verify that the grounding cabling is correct, that the grounding cable does not touch or block access to router components, and that it does not drape where people could trip on it.

    Figure 4: Connecting the Grounding Cable Connecting the Grounding Cable

Connect AC Power to an MX2008 Router with Three-Phase Delta AC Power Distribution Modules

CAUTION:

Do not mix AC and DC power modules within the same router.

Warning:

Power connections must be performed by a licensed electrician only.

Note:

The MX2008, MX2010, and MX2020 routers support the same power modules (AC/DC PSMs and AC/DC PDMs).

You connect AC power to the router with three-phase delta AC power distribution modules (PDMs) by connecting the AC power cord from an AC PDM to an AC power source.

To connect an AC power cord to an AC power source:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
  2. Switch off the dedicated customer-site circuit breakers. Ensure that the voltage across the AC power source cable leads is 0 V and that there is no chance that the cable leads might become active during installation.
  3. Detach the ESD grounding strap from the approved site ESD grounding point, and connect the strap to one of the ESD points on the chassis.
  4. Move the power switches on all the power supply module (PSM) faceplates to the off (O) position.
  5. Verify that the correct three-phase delta PDMs are installed and secured in the chassis before connecting power cables.
    Note:

    The power cables must be uninstalled and removed from the three-phase delta PDM before removal of the PDM from the chassis.

  6. Using a number 2 Phillips (+) screwdriver, unscrew the four captive screws located on either side of the metal AC wiring compartment (four screws total per PDM).
  7. Remove the metal cover of the metal AC wiring compartment.
  8. Unscrew the retaining nut from the AC power cord.
  9. Place the retaining nut inside the metal wiring compartment.
  10. Insert the wires of the AC power cord through the hole of the retaining nut and rubber grommet.
  11. Insert the wires of the AC power cord through the hole of the metal wiring compartment.
  12. Connect the wires to the AC terminal block on the three-phase delta AC PDM (see Figure 5). Loosen the input terminal or grounding point screw, insert each wire into the grounding point input terminal, and tighten the screw (see Table 1 for approved AC wire gauge).
    Note:

    The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws.

    To connect wires to the terminal block that serves six PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A1.

    3. Insert the wire labeled L2 into the input terminal labeled B1.

    4. Insert the wire labeled L3 into the input terminal labeled C1.

    Figure 5: Connecting Power to a Three-Phase Delta AC Power Distribution ModuleConnecting Power to a Three-Phase Delta AC Power Distribution Module
    Note:

    The three-phase delta AC PDM terminal blocks will be flipped depending on which slot the PDM gets plugged into.

    Note:

    The color of each AC power wire might vary. The MX2008 chassis is not sensitive to phase rotation sequence—either CW or CCW will operate correctly.

    CAUTION:

    Wire label configuration is for Juniper Networks supplied cable only. If you are using your own cable, make sure you use the proper connections.

    To connect wires to the terminal block that serves three PSMs:

    1. Insert the grounding wire into the grounding point labeled GND.

    2. Insert the wire labeled L1 into the input terminal labeled A2.

    3. Insert the wire labeled L2 into the input terminal labeled B2.

    4. Insert the wire labeled L3 into the input terminal labeled C2.

    Warning:

    To protect power supplies from input voltage that might be caused by mis-wired PDMs, before reinstalling the metal cover to the wiring compartment apply AC voltage to the PDM (with disengaged PSM) make sure that two LEDs on the PDM are lit green and that the AC voltage between AC terminal blocks A1-B1, B1-C1, C1-A1, A2-B2, B2-C2, and C2-A2 for three-phase delta PDM is not more than 264 VAC when measured with a digital voltage meter (DVM). Then turn off the AC breaker, de-energizing the PDM, and install the metal cover and engage all AC PSMs.

    Note:

    The terminal connections have either slotted screws or hex screws. Use a 1/4-in. slotted screwdriver for the slotted screws. Use a 5/32-in. (4 mm) Allen wrench for the 5/16-in. hex screws

    Note:

    Three-phase delta AC wire assembly kits can be purchased from Juniper Networks.
    Table 1: Supported Three-Phase Delta AC Wire Gauge
    Wire Gauge Description

    4 x 6-AWG or equivalent

    4 conductor wires, each wire is 6-AWG
    Note:

    We recommend that you use the proper gauge wire in order for the cable clamps to hold the AC cables. Using smaller gauge wiring results in the cable clamps not tightening properly.

    Warning:

    Power connections must be performed by a licensed electrician only.

  13. Verify that the power cable connections are correct.
  14. Screw the retaining nut onto the AC power cord to secure it to the metal wiring compartment.
  15. Reinstall the metal PDM wiring cover, and using a number 2 Phillips (+) screwdriver, tighten the four captive screws on the metal AC wiring compartment.
  16. Use the provided plastic cable tie to fasten the AC power cord to the PDM.
  17. Verify that the AC power cord does not touch or block access to router components, and that it does not drape where people could trip on it.
  18. Repeat the procedure for the other three-phase delta AC PDMs.