M120 Cabinet Requirements; M120 Cabinet Size And Clearance Requirements; M120 Cabinet Airflow Requirements - Juniper Networks Hardware Manual

M120 Multiservice Edge Router Hardware Guide
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M120 Cabinet Requirements

M120 Cabinet Size and Clearance Requirements

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M120 Cabinet Airflow Requirements

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M120 Router Chassis Description on page 6
M120 Router Physical Specifications on page 225
General Safety Warnings for M Series, MX Series, and T Series Routers on page 190
Installation Safety Warnings for M Series, MX Series, and T Series Routers on page 195
M120 Chassis Lifting Guidelines on page 195
M120 Cabinet Size and Clearance Requirements on page 38
M120 Cabinet Airflow Requirements on page 38
The minimum size cabinet that can accommodate the router is 600 mm wide and
800 mm deep. A cabinet larger than the minimum requirement provides better airflow
and reduces the chance of overheating. To accommodate a single router, the cabinet
must be at least 12 U (21 in. or 53.4 cm) high. If you provide adequate cooling air and
airflow clearance, you can stack four routers in a cabinet that has at least 48 U (84 in. or
2.1 m) of usable vertical space.
The minimum front and rear clearance requirements depend on the mounting
configuration you choose. The minimum total clearance inside the cabinet is 30.70 in.
between the inside of the front door and the inside of the rear door.
NOTE: If you mount the router in a cabinet, be sure that sufficient room is
provided for cable management and cables.
M120 Cabinet Airflow Requirements on page 38
Installing the Mounting Hardware for a Front-Mount Four-Post Rack or Cabinet on
page 49
When you mount the router in a cabinet, you must ensure that ventilation through the
cabinet is sufficient to prevent overheating. Following is a list of requirements to consider
when planning for chassis cooling:
Ensure that the cool air supply you provide through the cabinet can adequately dissipate
the thermal output of the router. Table 25 on page 227 lists the router's environmental
specifications, including its operating temperature and thermal output.
Ensure that the cabinet allows the chassis hot exhaust air to exit from the cabinet
without recirculating into the router. An open cabinet (without a top or doors) that
employs hot air exhaust extraction from the top allows the best airflow through the
chassis. If the cabinet contains a top or doors, perforations in these elements assist
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