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Catalyst 3750-E and Catalyst 3560-E Switch Hardware Installation Guide
OL-9774-04
Chapter 1 Product Overview
Rear Panel Description
The power-supply modules have two status LEDs. Table 1-14 lists the LED colors and their meanings.
For more information about replacing a power-supply module, wiring a DC power-supply module, and
for module specifications, see
Chapter 3, “Power Supply and Fan Module Installation, and Appendix A,
“Technical Specifications.
Fan Modules
The 24- and 48-port switch models have one internal hot-swappable 12-V fan module that inserts in the
switch rear panel (part number C3K-BLWR-60CFM=). The air circulation system consists of the fan
module and the power supply modules. The airflow patterns vary depending on the power supply
configuration.
Ta b l e 1-14 Catalyst 3560E-12D and 3560E-12SD Switch Power-Supply Module LEDs
AC-Power-Supply Module LEDs
1
1. If one power-supply module is installed but not turned on, the module LEDs continue to operate because of the shared voltage
between the power-supply modules. If the only operating power-supply module fails or is turned off, the LEDs for neither
module are on.
AC OK Description PS OK Description
Off No AC input power to either power
supply, or both power supplies are
turned off.
Off No AC input power to either
power supply, or both power
supplies are turned off.
Green AC input power present. Green Power output to switch is active
with no fault conditions.
Red No AC input power or power supply
is turned off.
Red AC OK LED is red, no output
power to the switch, or the power
supply or power supply fan has
failed.
DC-Power-Supply Module LEDs
1
DC IN Description PS OK Description
Off No DC input power to either power
supply.
Off No DC input power to either
power supply.
Green DC input power present. Green Power output to switch is active
with no fault conditions.
Red No DC input power. Red DC IN LED is red, no output
power to the switch, or the power
supply or power supply fan has
failed.
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