M320 Cable Management System Description; Figure 19: Airflow Through The Chassis - Juniper M320 Hardware Manual

M320 Router Hardware Guide

Figure 19: Airflow Through the Chassis

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M320 Cable Management System Description

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The host subsystem monitors the temperature of the router components. When the
router is operating normally, the fans function at lower than full speed. If a fan fails or
the ambient temperature rises above a threshold, the speed of the remaining fans is
automatically adjusted to keep the temperature within the acceptable range. If the
ambient maximum temperature specification is exceeded and the system cannot be
adequately cooled, the Routing Engine shuts down some or all of the hardware
components.
M320 Cabinet Airflow Requirements on page 47
Maintaining the M320 Fan Trays on page 111
Troubleshooting the M320 Cooling System on page 129
The cable management system (see Figure 20 on page 39) consists of a row of nine
semicircular plastic bobbins mounted on the front of the router below the FPC card cage.
The PIC cables pass between the bobbins and into the tray, keeping the cables organized
and securely in place. The curvature of the bobbins also helps maintain the proper bend
radius for optical PIC cables.
You can pull the cable management system up and outward to lock it into the
maintenance position. This allows you to access the lower fan tray and the front air filter.
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