Figure 309: M5 And M10 Router Cooling System And Airflow - Juniper M Series Monitoring And Troubleshooting Manual

M Series and T Series Routers Monitoring and Troubleshooting Guide

Figure 309: M5 and M10 Router Cooling System and Airflow

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Documentation
M7i Router Redundant Cooling System Components
626
alarm LED on the craft interface lights. If the router temperature exceeds the critical level,
the router automatically shuts down.
CAUTION: Do not operate the router for more than 1 minute without a fan
tray.
Checklist for Monitoring Redundant Cooling System Components on page 623
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
310 on page 627.)
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.
CAUTION: Do not operate the router for more than 1 minute without a fan
tray.
Figure
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