JUNOS Internet Software Network Operations Guide: Hardware
528 ! Understanding Redundant Cooling System Components
The fans operate in unison to maintain an acceptable operating temperature for the
Routing Engine and midplane. Each cooling subsystem maintains a separate
airflow, and each is monitored independently for temperature control. Figure 212
shows the M20 router cooling system components and airflow.
Figure 212: M20 Router Cooling System and Airflow
Both front and rear fan trays are hot-removable and hot-insertable. You can remove
and replace these components without powering down the system and disrupting
routing functions. Figure 213 shows the M20 router cooling system components.
Figure 213: M20 Router Cooling System Components
Front fan trays
Front of router
Rear fan tray
Side of chassisFront of chassis
Fan
Fan
Fan
Craft interface display
SSB
SSB
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Upper fan
Middle fan
Bottom fan
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Front fan tray(s)
Upper fan
Middle fan
Bottom fan
RearFront
Rear fan tray
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