Juniper M Series User Manual

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 309: M5 and M10 Router Cooling System and Airflow
Related
Documentation
Checklist for Monitoring Redundant Cooling System Components on page 623•
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
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.
Copyright © 2012, Juniper Networks, Inc.626
M Series and T Series Routers Monitoring and Troubleshooting Guide

Juniper M Series Specifications

General

Brand	Juniper
Model	M Series
Category	Network Router
Language	English