Cisco WS-C4928-10GE Installation Guide - Page 33

Chassis Cooling

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Chapter 1 Product Overview Switch Components Table 1-1 LED Functions (continued) LED Color or State Description FAN Off Green Red No power to the switch or fans (the tray may not be plugged in especially if one or more of the power supplies status LED is green) Fan tray operational Fault detected PS1 and PS2 Off Green Red No power to the PS Operational1 Fault detected or the on/off switch is set to off while the power supply is plugged in 1. If either LED is green and the other is OFF the power supply is probably 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 use the CLI for further status information. Chassis Cooling Note For environmental specifications, see Chapter 2, "Site Planning." The hot-swappable system fan tray provides cooling air for the internal chassis components. The fans exhaust air to the rear, and fresh air is drawn in from the sides 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 not be left operating without a fan tray for longer than is necessary to replace a faulty fan tray with a new one. Figure 1-8 shows the direction of airflow going in and out of the switch. 78-18039-02 Catalyst 4900 Series Switch Installation Guide 1-11

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1-11
Catalyst 4900 Series Switch Installation Guide
78-18039-02
Chapter 1
Product Overview
Switch Components
Chassis Cooling
Note
For environmental specifications, see
Chapter 2, “Site Planning.”
The hot-swappable system fan tray provides cooling air for the internal chassis
components. The fans exhaust air to the rear, and fresh air is drawn in from the
sides 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 not be left operating without a fan
tray for longer than is necessary to replace a faulty fan tray with a new one.
Figure 1-8
shows the direction of airflow going in and out of the switch.
FAN
Off
Green
Red
No power to the switch or fans (the tray may
not be plugged in especially if one or more of
the power supplies status LED is green)
Fan tray operational
Fault detected
PS1 and
PS2
Off
Green
Red
No power to the PS
Operational
1
Fault detected or the on/off switch is set to
off while the power supply is plugged in
1.
If either LED is green and the other is OFF the power supply is probably 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 use
the CLI for further status information.
Table 1-1
LED Functions
(continued)
LED
Color or State
Description