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3-9
Cisco Catalyst 4900M Switch Installation Guid e
78-18350-02
Chapter 3 Installing the Switch
Connecting DC-Input Power to the Catalyst 4900M Switch
Step 6 Verify power supply operation by looking at the chassis front panel power supply LEDs:
• The PS1 or PS2 LED is lit green when the power supply and fans are functioning normally.
• The PS1 or PS2 LED is lit red when the power supply is not functioning normally. The on/off switch
may be set to off while the power supply is plugged in, or the power supply may be defective and
not providing DC power to the switch. There may also be a fan failure.
• The PS1 or PS2 LED is off when there is no power supply installed.
From the system console, enter the show pow er command to display the power supply and sy stem status.
For more information on this command, see the command reference publication for your software
release.
If the LEDs or show power command indicate a power or other system problem, see Chapter 4,
“Troubleshooting the Installation,” for troubleshooting information.
Connecting DC-Input Power to the Catalyst 4900M Switch
Before you connect the power supply to a power source, ensure that all of the site power and grounding
requirements described in Chapter 2, “Site Planning,” have been met and the chassis is properly
grounded as described in the “Grounding Requirements” section on page 2-7.
Wa r ni n g
Before performing any of the followin g procedures , ensure that power is rem oved from the DC circuit.
Statement 1003
Wa r ni n g
This unit is intended for installation in restricted access areas. A restricted access area can be
accessed only through the use of a special tool, lock and key, or other means of security.
Statement 1017
Wa r ni n g
This product requires short-circu it (overcurrent) protection, to be prov ided a s part of th e buildin g
installation. Install only in accordance with national and local wiring regulations.
Statement 1045
Wa r ni n g
Hazardous volt age or energy m ay be present on DC power termina ls. A lways replace cover wh en
terminals are not in service. Be sure uninsulated conductors are not accessible when cover is in
plac e.
Statement 1075
To connect source DC to the DC-input power supply, perform the following steps:
Step 1 Set the power switch or circuit breaker to the off (0) position on the source DC circuit that feeds the
power supply that you are installing.
As an added precaution, place the appropriate safety flag and lockout devices at the source power circuit
breaker, or place a piece of adhesive tape over the circuit breaker handle to prevent accidental power
restoration while you are working on the circuit.
Step 2 Verify that the power switch is in the off (0) position on the power supply that you are installing.

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