User's Manual

1-6
Cisco Catalyst 4900M S witch Inst allati on Guide
78-18350- 0 2
Chapter 1 Product Overview
Catalyst 4900M Switch Chassis
Chassis Cooling
The hot-swappable chassis f an tray (WS-X4992) provide s cooling air for the inte rnal 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 oper ate without a fan t ray for lo nger th an is nec essary to replace a faulty fa n tray
with a new fan tray.
Figure 1-4 shows the direction of airflow through the switc h.
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 th e
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 i s OFF the pow er supply i s probably not plugged in. If it is re d, the
supply is either plugged in and not switched on or it is faulty. It may be necessary t o interrogate t he system
for further status using the CLI.
Table 1-3 Front Pane l LE D De scr ipti ons (c onti nue d)
LED Description