Juniper Networks E-Series - Manual (Page 57)

Rack-Mounted Installation
E-Series Routers
4-3
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.