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1-7
Cisco Catalyst 4900M Switch Installation Guid e
78-18350-02
Chapter 1 Product Overview
Catalyst 4900M Switch Chassis
Figure 1-4 Catalyst 4900M Chassis Airflow
There are five fans in the fan tray. If an individual fan fails, the other fans continue to run. Sensors
monitor the internal air temperatures. The number of fans in operation and their speed varies according
to the internal temperature for the quietest operation possible. If the air temperature exceeds a desired
threshold, the environmental monitor displays warning messages.
Note Individual fans in the fan tray cannot be replaced; the entire fan tray must be replaced.
Power Supplies
Note For complete power specifications for the Catalyst 4900M switch, see Appendix A, “Specifications.”
The Catalyst 4900M switch has two redundant internal 1 000 W AC-input or 1000 W DC-input power
supplies.
The internal power supplies have individual power cords and status LEDs (PS1 and PS2 on the front
panel). There are also LEDs on the power supplies that show status for the input (Input OK) and output
(Output OK) currents. A power cord is used to connect the power supplies to the site AC source. There
is a power switch on the AC-input power supplies; AC power is present when a power cord is plugged
into a power supply and the switch is set to the On position. DC-input power supplies attach to source
DC using customer-supplied cables.
The sw itch starts with only one power supply plugged in, but redundant failover and load sharing is not
available in this configuration. Cisco recommends that you always connect both power supplies to
separate AC or DC circuits for optimal power reliability.
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