Juniper Networks M160 manual Maintaining the Fan Tray and Impellers, Installing the Air Filter

M160 Internet Router Hardware Guide

is attached to a proper earth ground. For more information about ESD, see “Preventing Electrostatic Discharge Damage” on page 226.

2.Grasp the sides of the air filter and push it firmly into place over the air intake vent.

3.Tighten the thumbscrew at each corner of the air filter cover.

Figure 63: Installing the Air Filter

Air filter cover

1218

Air filter

Maintaining the Fan Tray and Impellers

The fan tray is attached to the back of the cable management system and installs into the front of the chassis, as shown in Figure 1. There are also three separate, non-interchangeable impeller assemblies. The front impeller is located behind the craft interface (shown in Figure 1) and works together with the fan tray to cool the FPCs and midplane. The upper and lower impellers on the rear of the chassis (shown in Figure 2) work together to cool the components that install into the rear of the chassis.

To check the status of the impellers and the fans in the fan tray, issue the

show chassis environment command. The output includes an entry for each impeller (which it refers to as a Blower) and for each fan in the fan tray:

user@host> show chassis environment
Class	Item		Status	Measurement
...
Fans	Rear Bottom Blower		OK	Spinning at normal speed
	Rear Top	Blower	OK	Spinning at normal speed
	Front Top Blower		OK	Spinning at normal speed
	Fan Tray	Rear Left	OK	Spinning at normal speed
	Fan Tray	Rear Right	OK	Spinning at normal speed
	Fan Tray	Front Left	OK	Spinning at normal speed
	Fan Tray	Front Right	OK	Spinning at normal speed
...

130 Maintaining Cooling System Components