Understanding the Cooling System

Purpose

Inspect the router cooling system to ensure that air is flowing through the router to cool the components installed in the router chassis. If the router temperature exceeds the critical level, the router automatically shuts down.

What Is the Cooling System

The cooling system includes the fans and impellers that provide cooling in the router chassis to keep the components operating at an acceptable temperature.

Table 68 describes the cooling system components for each routing platform.

Table 68: Router Cooling System Components per Routing Platform

Power Supply Characteristic	M5/ M10	M7i	M10i	M20	M40	M40e	M160	M320	T320	T640
Fan tray	1 with 4 fans	1 with 4 fans	2 with 8 fans each	3 front 1 rear		1	1 lower fan tray	2 front, 1 rear	2 front 1 rear	2 front 1 rear
Power supply integrated fan	_	_	_	2	2	_	Cooled by air flowing through the chassis	_	_	_
Impellers	_	_	_	_	2 pairs	1 central impeller 1 rear upper impeller 1 rear lower impeller	1 upper impeller 2 rear impellers	_	_	_
Fan assemblies	_	_	_	_	3	_	_	_	_	_
Air filter	_	_	_	_	1	1	1	1 front, 1 rear	1 front 1 rear	1 front 1 rear

The following sections describe the various routing platform cooling systems:

• M5 and M10 Router Cooling Systems
• M7i Router Cooling System
• M10i Router Cooling System
• M20 Router Cooling System
• M40 Router Cooling System
• M40e and M160 Router Cooling Systems
• M320 Router Cooling System
• T320 Router and T640 Routing Node Cooling Systems