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Catalyst 3750-E and Catalyst 3560-E Switch Hardware Installation Guide
OL-9774-03
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.
Tab l e 1-14 Catalyst 3560E-12D and 3560E-12SD Switch Power-Supply Module LEDs
AC-Power-Supply Module LEDs
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.
1
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 LEDs1
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.
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 Catalyst 3560E-12D switch has four internal hot-swappable 12-V fan modules that insert in the
switch rear panel. The Catalyst 3560E-12SD switch has two internal hot-swappable 12-V fan modules
that insert in the switch rear panel. Each fan module (part number C3K-FAN-16CFM=) has a green LED
that shows that it is operating. The LED is off when there is a fan failure.
The Catalyst 3560E-12D or 3560E-12SD switch continues to operate when there is one failed fan, either
a power-supply fan or a chassis cooling fan. If one fan fails, the switch returns an error message. If a
second fan fails, either a power supply fan or a chassis cooling fan, the switch returns an error message,
writes a failure log to flash memory, and shuts down.
For more information about installing a fan module and the module specifications, see Chapter 3,
“Power Supply and Fan Module Installation,” and Appendix A, “Technical Specifications.”
AC OK Description PS OK Description