Juniper PTX3000 Quick Start Manual page 4

front of the chassis adds 1.9 in. (4.8 cm) to the depth, for a total depth of 10.6 in. (26.9 cm). The outer
edges of the mounting brackets extend the width to 19 in. (48.3 cm).
The rack must be strong enough to support the weight of the fully configured PTX3000, up to about
310 lb (140.6 kg).
You must allow sufficient clearance around the rack:
For the cooling system to function properly, the airflow around the chassis must be unrestricted.
For service personnel to remove and install hardware components, there must be adequate space at the
front of the chassis. At least 24 in. (61.0 cm) is required in front of the PTX3000. NEBS GR-63 recommends
that you allow at least 30 in. (72.6 cm) in front of the rack.
Additional clearance is required to accommodate the depth of the cable management system:
1.9 in. (4.8 cm) additional depth in the front of the chassis.
The compact form-factor of the chassis allows up to four PTX3000 routers to be installed in a single
four-post rack. For all configurations, there must be at least 10 in. (25.4 cm) between the PTX3000 and
neighboring devices to the side, and there must be no obstruction above the chassis that prevents airflow.
Depending on your installation, the required clearance at the rear of the chassis varies:
A standalone PTX3000 requires 2 in. (5.1 cm) of clearance at the rear (see
Two PTX3000 routers installed back-to-back require 4 in. (10.2 cm) of clearance between the routers
at the rear.
Four PTX3000 routers installed back-to-back and stacked in a single rack require 10 in. (25.4 cm) of
clearance between the routers at the rear (see
NOTE: These requirements have been designed to provide adequate cooling in deployments
with ambient temperatures up to 104°F (40°C).
Figure 2 on page 6).
Figure 1 on page 5).
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