Chassis airflow – Cisco CRS-1 User Manual
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Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
OL-5802-09
Chapter 2 Power and Cooling
Chassis Airflow
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Wye power cord has a 5-pin IEC 60309 plug (3 wire + neutral + protective earthing conductor
(ground wire) [3W+N+PE]). The cord is rated for 415 VAC, 16 A, and plugs into a similarly
rated IEC 60309 receptacle.
•
Grounding-type AC power outlet is required. The PDUs are shipped with AC power cords that have
a grounding-type plug. As a safety feature, the plugs fit only a grounding-type AC power outlet.
show the plugs for the power cords on the AC Delta and Wye PDUs.
Figure 2-17
AC Delta Power Cord Plug
Figure 2-18
AC Wye Power Cord Plug
For detailed Cisco CRS Power Distribution Unit AC power specifications, see the
Chassis Airflow
The Cisco CRS 8-slot line card chassis has two fan trays, with four fans each, 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, as shown
in
In addition, each fixed configuration 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 side
of the chassis. How often you should replace the air filters 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.
116876
To AC outlet
116877
To AC outlet