Rack Requirements For Acx5400 Routers - Juniper ACX5448-D Hardware Manual

Table 31: Cabinet Requirements for ACX5400 Routers (continued)
Cabinet Requirement
Cabinet airflow requirements

Rack Requirements for ACX5400 Routers

The ACX5400 routers are designed to be installed on four-post racks.
Table 32 on page 72 provides the rack requirements and specifications for ACX5400 routers.
Table 32: Rack Requirements for ACX5400 Routers
Rack Requirement Guidelines
Rack type Use a four-post rack that provides bracket holes or hole patterns spaced at 1-U increments
(1.75 in. or 4.45 cm) and that the rack meets the size and strength requirements to support the
weight.
A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment
(document number EIA-310–D) published by the Electronics Industry Association.
Mounting bracket Ensure that the holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm) so that
hole spacing the router can be mounted in any rack that provides holes spaced at that distance.
Guidelines
When you mount the router in a cabinet, ensure that ventilation through the
cabinet is sufficient to prevent overheating.
Ensure that the cool air supply you provide through the cabinet adequately
dissipates the thermal output of the router (or routers).
Ensure that the cabinet allows the chassis hot exhaust air to exit 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.
The ACX5400 router fans exhaust hot air either through the vents on the
port panel or through the fan modules and PSMs. Install the router in the
cabinet in a way that maximizes the open space on the FRU side of the
chassis. This maximizes the clearance for critical airflow.
Route and dress all cables to minimize the blockage of airflow to and from
the chassis.
Ensure that the spacing of rails and adjacent cabinets allows for the proper
clearance around the router and cabinet.
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