JUNOS Internet Software Network Operations Guide: Hardware
524 ! Understanding Redundant Cooling System Components
Understanding Redundant Cooling System Components
Purpose Inspect the router redundant cooling system components to ensure that air is
flowing through the router to cool the components installed in the router chassis. If
the router temperature exceeds a critical level, the router automatically shuts down.
What Are Redundant
Cooling System
Components
Redundant cooling system components are more than just one fan or impeller
installed in a router to ensure that the air is flowing through the router and that an
acceptable temperature is maintained to cool the components installed in the
chassis.
Table 114 describes the redundant cooling system components and characteristics
for each routing platform.
Table 114: Redundant Cooling System Components Characteristics Per Routing Platform
The following sections describe the various routing platform cooling systems:
! M5 and M10 Router Redundant Cooling System Components on page 525
! M7i Router Redundant Cooling System Components on page 526
! M10i Router Redundant Cooling System Components on page 527
! M20 Router Redundant Cooling System Components on page 527
! M40 Router Redundant Cooling System Components on page 529
! M40e and M160 Router Redundant Cooling System Components on page 531
! M320 Router Redundant Cooling System Components on page 533
! T320 Router Redundant Cooling System Components on page 534
! T640 Routing Node Redundant Cooling System Components on page 537
Cooling System
Component
M5 and
M10
M7i M10i M20 M40 M40e M160
M320/T320
/T640
Fan tray 1 fan tray
with 4
fans
1 2 3 front
1 rear
1 1 lower 2 front
1 rear
Power supply
integrated fan
___22 _ Cooled by air
flowing
through the
chassis
Cooled by air
flowing
through the
chassis
Impellers _ _ _ _ 2 pairs 1 central
1 rear
upper
1 rear lower
1 upper
2 rear
_
Fan assemblies____3 _ _ _
Air filter ____11 1 1 front
1 rear
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