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Catalyst 4500 E-Series Switches Installation Guide
OL-13972-02
Chapter 2 Preparing for Installation
Site Requirements
• Verify that the enclosed or partially enclosed rack allows an adequate flow of air through the switch
chassis as follows:
–
If the difference between the measured intake air temperature and the exhaust air temperature
does not exceed 10°C (18°F), there is sufficient airflow in the rack.
–
If the difference in air temperature exceeds 10°C (18°F), there is insufficient airflow to cool the
chassis.
Note The 10°C (18°F) temperature differential between the intake and the exhaust must be determined
by taking measurements using external digital temperature probes. Do not use the chassis
internal temperature sensors to measure the temperature differential.
• Plan ahead. Your Catalyst 4500 E-series switches currently installed in an enclosed or partially
enclosed rack might meet ambient air temperature and airflow requirements now. However, if you
add more chassis to the rack or you add more modules to a chassis in the rack, the additional heat
generated might cause the ambient air temperature within the rack to exceed 104°F (40°C) and can
cause minor alarms.
Fan Tray Assembly
The chassis fan tray assembly provides cooling air for the supervisor engines and the switching modules.
The fan tray assembly is a FRU and can be removed and installed in the chassis while the system is
online. The number of individual fans per fan tray varies:
• Catalyst 4503-E fan tray assembly (WS-X4593-E)—Two fans
• Catalyst 4506-E fan tray assembly (WS-X4596-E)—Four fans
• Catalyst 4507R-E and Catalyst 4507R+E fan tray assembly (WS-X4597-E)—Eight fans
• Catalyst 4510R-E and Catalyst 4510R+E fan tray assembly (WS-X4582-E)—Ten fans
The fan tray assemblies draw in room air from the right side of the chassis and exhaust the air on the left
side of the chassis. Catalyst
4500 E-series airflow is shown in Figure 2-1.
Caution You must install module filler plates on unused switching module slots to ensure proper airflow and
cooling through the chassis.
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