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Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Installation Guide
OL-6256-17
Chapter 1 Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Overview
Chassis Cooling System
Figure 1-8 shows the cable management bracket.
Figure 1-8 Cable Management Bracket
Chassis Cooling System
The chassis has two fan trays, each with four fans, that cool the chassis card cages. Cool air flows in at
the bottom front of the chassis and flows through the chassis card cages and through the fans in the fan
trays before being exhausted through the bottom rear of the chassis (see Figure 1-9). In addition, each
AC or DC power module at the bottom of the chassis has self-contained fans that pull in cool air from
the front of the chassis and exhaust warm air out the rear.
A replaceable air filter is located on the front of the chassis below the PLIM card cage. Each fixed
configuration power module also has a replaceable air filter that attaches to the module at the front
(PLIM) side of the chassis. How often the air filters should be replaced depends on the facility
environment. In a dirty environment, or when you start getting frequent temperature alarms, you should
always check the intake grills for debris, and then check the air filters to see if they need to be replaced.
Note We recommend that you check the air filters once a month. Replace a filter when you notice a significant
amount of dust.
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