Juniper Networks recommends that you use a standard EIA distribution rack. Refer to Equipment Rack Requirements in Chapter 3, Installation Guidelines and Requirements, for detailed rack information.
Before installing the systems in a rack, consider the following guidelines and refer to Figure 4-2:
- You can install up to three ERX-14xx models, six ERX-7xx models, or fourteen ERX-310 routers in a single 7-ft. (2.1 m) rack.
Installing multiple systems in a single rack allows you to maximize your available space.
- You can install an ERX-14xx model, an ERX-7xx model, and an ERX-310 router together in the same rack (see Figure 4-2).
If you install an ERX-7xx model or ERX-310 router directly above an ERX-14xx model in the same rack, you must install a plenum between the ERX-7xx model or ERX-310 router and the ERX-14xx model so that the air can circulate between the systems (see Figure 3-2). This plenum is available from Juniper Networks.
If you install an ERX-14xx model above an ERX-7xx model or ERX-310 router, there is no need to install a plenum between the units because the ERX-7xx models and ERX-310 routers vent air out the side of the chassis.
Warning: To maintain airflow requirements, a plenum must be installed above an ERX-14xx model before any other piece of equipment is installed above the router.
- Install heavier systems, such as an ERX-14xx model, on the bottom of the rack. Lighter systems, such as the ERX-310 router, should be mounted higher in the rack.
Figure 4-2 E-series routers installed in recommended order
Observe the following safety guidelines when mounting the router in a rack.
|Rack Installation Warning: Install equipment in the rack from the bottom upward. This will maintain the stability of the rack and reduce the chance of the rack's tipping over.
|Heavy-Equipment Warning: Three people are required to install the E-series router in a rack: two to lift the system into position and one to screw it to the rack.
|Branch Circuit Warning: Evaluate the overall loading of the branch circuit before you install any equipment into a rack.
|Ground (Earth) Warning: Connect the E-series router or rack to ground (earth), and ensure that a reliable grounding path is maintained in the rack.
|Lightning Activity Warning: Do not work on the system or connect or disconnect cables during lightning activity.
|DC Power Disconnection Warning: Before powering on the E-series router, remove power from the DC circuit by deactivating the circuit breaker on the panel board that services the DC circuit.
|Servicing Unit Warning: Before servicing the E-series router, turn off the power.
|Jewelry Removal Warning: Remove jewelry (including rings, necklaces, and watches) before working on equipment that is connected to power lines. Metal objects heat up when connected to power and ground and can cause serious burns or become welded to the terminals.
|Metal Objects Warning: Do not insert any metal object, such as a screwdriver, into an open slot or the backplane. Doing so may cause electric shock and serious burns.
|ERX-310 Router Power Cord Warning: The ERX-310 router AC model has more than one power-supply cord. Disconnect 2 power cords BEFORE servicing to avoid electric shock.
Preparing the Equipment Racks
Following your installation plan, use a tape measure and marking pen to measure and mark space on each equipment rack for each E-series router component. Horizontal spacing should follow NEBS requirements. If you choose not to install a plenum, be sure to include 2 U of space between the each chassis to allow for proper exhaust. A plenum, however, is highly recommended.
Installing the Router
To complete the installation of the router in a rack, you need:
- A Phillips screwdriver
- Depending on the router, up to eight 10-32 x 3/8 Phillips screws (provided with the router ) for each router to be installed
|Warning: Three people are required to install the E-series router in a rack: two to lift the system into position and one to screw it to the rack.
|Note: All persons handling an E-series router should wear an antistatic device.
To install the router in the rack:
- Position the router in its designated location in the equipment rack. Make sure the holes of the mounting brackets align evenly with the holes of the equipment rack on both sides.
|Note: One person should stand on the left side of the router, and another should stand on the right side when lifting.
- Starting at the bottom, secure the router in the equipment rack by using the 10-32 x 3/8 Phillips screws.
- Connect the necessary cables (see Chapter 6, Cabling E-Series Routers, for instructions on installing the cables).
Figure 4-2 illustrates a distribution rack with one ERX-310 router, one ERX-7xx model, and one ERX-14xx model installed.