Rack-Mounted Installation
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.
Installation Guidelines
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.
