Juniper MX10003 Hardware Manual page 69

Table 25: Cabinet Requirements and Specifications for an MX10003 Router (continued)
Cabinet Requirement
Cabinet airflow requirements
Guidelines for the MX10003 Router
When you install the router in a cabinet, you must ensure that ventilation through
the cabinet is sufficient to prevent overheating. Consider the following
requirements to when planning for chassis cooling:
Airflow must always be from front to back with respect to the rack. If the device
has side to rear airflow, then provisions must be made to ensure that fresh air
from the front of the rack is supplied to the inlets, and exhaust exits from the
rear of the rack. The device must not interfere with the cooling of other systems
in the rack. Fillers must be used as appropriate in the rack to ensure there is
no recirculation of heated exhaust air back to the front of the rack. Care must
also be taken around cables to ensure no leakage of air in situations where
recirculation might result.
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 with removing the hot air exhaust. For an illustration
of chassis airflow, see Figure 20 on page
Ensure that the cool air supply you provide through the cabinet can adequately
dissipate the thermal output of the router.
Route and dress all cables to minimize the blockage of airflow to and from the
chassis.
Ensure that the spacing of rails and adjacent racks allows for the proper
clearance around the router and rack as specified in
Clearance Requirements for Airflow and Hardware Maintenance" on page
Install the router as close as possible to the front of the cabinet so that the
chassis just clears the inside of the front door. This maximizes the clearance in
the rear of the cabinet for critical airflow.
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