Fan Modules - Cisco Catalyst 3850 Hardware Installation Manual

Chapter 1 Product Overview
The power supply modules have two status LEDs.
Table 1-16
AC-Power Supply Module LEDs
AC OK
Off
Green
DC-Power Supply Module LEDs
DC OK
Off
Green
For information about replacing a power supply module, wiring a DC power supply module, and module
specifications, see

Fan Modules

The switch has three internal hot-swappable 12-V fan modules. The air circulation system consists of
the fan modules and the power supply modules. The airflow patterns vary depending on the power supply
configuration.
Figure 1-8
flow, and the red arrow shows warm air flow. When the fan modules are operating properly, a green LED
is on at the top left corner of the fan assembly (viewed from the rear). If the fan fails, the LED turns to
amber. The switch can operate with two operational fans, but the failed fan should be replaced as soon
as possible to avoid a service interruption due to a second fan fault.
Three fans are required for proper cooling.
Note
OL-26779-02
Switch Power Supply Module LEDs
Description
No AC input power.
AC input power present.
Description
No DC input power.
DC input power present.
Chapter 4, "Power Supply Installation,"
shows the airflow patterns for the 24- and 48-port switches. The blue arrow shows cool air
PS OK Description
Off Output is disabled, or input is
outside operating range (AC LED
is off).
Green Power output to switch active.
Red Output has failed.
PS OK Description
Off Output is disabled, or input is
outside operating range (DC LED
is off).
Green Power output to switch active.
Red Output has failed.
and Appendix A, "Technical Specifications."
Catalyst 3850 Switch Hardware Installation Guide
Rear Panel
1-21