Installation Guidelines

Before installing the systems in a rack, consider the following guidelines and refer to Figure 15:

• You can install up to 3 ERX-14xx models, 6 ERX-7xx models, or 14 ERX-310 routers in a single 7-ft. (2.1 m) rack.

  Installing multiple systems in a single rack enables 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 15.)

  Caution: 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 53.) 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.

• Install heavier systems, such as an ERX-14xx model, on the bottom of the rack. Mount lighter systems, such as the ERX-310 router, higher in the rack.

  Figure 15: ERX Routers Installed in Recommended Order

  

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