3-9
Cisco Catalyst 4900M Switch Installation Guide
78-18350-02
Chapter 3 Installing the Switch
Connecting DC-Input Power to the Catalyst 4900M Switch
Step 6Verify 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 power command to display the power supply and system 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.
Warning
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Warning
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
Warning
This product requires short-circuit (overcurrent) protection, to be provided as part of the building
installation. Install only in accordance with national and local wiring regulations.
Statement 1045
Warning
Hazardous voltage or energy may be present on DC power terminals. Always replace cover when
terminals are not in service. Be sure uninsulated conductors are not accessible when cover is in
place.
Statement 1075
To connect source DC to the DC-input power supply, perform the following steps:
Step 1Set 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 2Verify that the power switch is in the off (0) position on the power supply that you are installing.