Cable Management System - Juniper M40 Hardware Manual

Cable Management Sy stem
Airflow through the Chassis
Figure 10: Side View of Air Flow through the Chassis

Cable Management System

24 M40 Internet Router Hardware Guide
Figure 10 shows airflow through the chassis and the location of the cooling subsystems.
Exhaust for
Upper impellers
Packet Forwarding
Engine cooling
Exhaust for Routing
Fan tray
Engine and backplane
cooling
Routing
Engine
Rear of Chassis
Exhaust for
power supply
The cable management system is a row of staggered metal hooks located at the top of the
chassis front (see Figure 1). Each hook is draped with a rounded plastic shield and the row is
shielded by a removable cover. Threading PIC cables through the hooks keeps cables in place,
reduces tangling, prevents undue stress on a cable by distributing its weight evenly, and helps
maintain the proper bend radius for optical cables.
Packet
Forwarding
Engine
Lower impellers
Power supply
and Fans
Front of Chassis
Air intake for
Packet Forwarding
Engine cooling
Air intake for
Routing Engine cooling
Air intake for
power supply cooling