JUNOS Internet Software Network Operations Guide: Hardware
526 ! Understanding Redundant Cooling System Components
M7i Router Redundant Cooling System Components
The M7i router cooling system consists of a fan tray containing four individually
fault-tolerant fans. The fan tray inserts into the left side of the chassis (left fans 1
through 4) and connects directly to the router midplane. If a single fan fails, the
remaining fans continue to function indefinitely. The fan tray provides side-to-side
cooling. (See Figure 210.)
The fan tray is hot-removable and hot-insertable. You can remove and replace these
components without powering down the system and disrupting routing functions.
The cooling system is fault-tolerant. The router can tolerate the failure of a single fan
for approximately 36 hours. If a fan fails, the router issues a yellow alarm and the
yellow alarm LED on the craft interface lights. If the router temperature exceeds the
critical level, the router automatically shuts down.
Figure 210: M7i Router Cooling System and Airflow
CAUTION: Do not operate the router for more than 1 minute without a fan tray.
g002290
Fan tray
Front of chassisFans
6" (15.2 cm)
for airflow
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