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1-6
Cisco Catalyst 4900M Switch Installation Guide
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Chapter 1 Product Overview
Catalyst 4900M Switch Chassis
Chassis Cooling
The hot-swappable chassis fan tray (WS-X4992) provides cooling air for the internal chassis
components. The fans draw air in from the right side of the chassis and exhaust the heated air through
perforations on the right side of the chassis.
Caution When the fan tray is removed, internal circuitry is exposed that should not be touched by tools or fingers.
The system should n ot operate without a fan tray for longer than is necessary to replace a faulty fan tray
with a new fan tray.
Figure 1-4 shows the direction of airflow through the switch.
Fan
(front and rear)
FAN LED indicates the fan tray status.
• Green—Fan tray operational.
• Red—Fault detected. One or more fans not functional.
• Off—No power to the fan tray.
PS1 and PS2
(front)
PS1 and the PS2 LEDs indicates the internal power supply status.
• Off—No power to the power supply.
• Green—Operational.
1
• Red—Fault detected or the on/off switch is set to off while the
power supply is plugged in.
LINK A link status LED is located below the 10-GB uplink ports.
1. If either LED is green and the other is OFF the power supp ly is probabl y not plugged in. If it is red, the
supply is either plugged in and not switched on or it is faulty. It may be necessary to interrogate the system
for further status using the CLI.
Table 1-3 Front Panel LED Descriptions (continued)
LED Description

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