Special Considerations For The 1400 W Dc Power Supply - Cisco Catalyst 4500 Series Configuration Manual

Power Management
PS1-2
PS2
PS2-1
PS2-2
Power supplies needed by system
Power supplies currently available : 2
Power Summary
(in Watts)
----------------------
System Power (12V)
Inline Power (-50V)
Backplane Power (3.3V)
----------------------
Total
Switch#

Special Considerations for the 1400 W DC Power Supply

Caution Do not mix the 1400 W DC power supply with any other power supply, even for a hot swap or other
short-term emergency. Doing so can seriously damage your switch.
Keep in mind the following guidelines when using a 1400 W DC power supply with your Catalyst 4500
series switch:
•
•
•
•
Configuring the DC Input for a Power Supply
To configure the DC input power for the 1400 W DC power supply or a power shelf, perform this task:
Command
Step 1
Switch# configure terminal
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
12-18
PWR-C45-4200ACV AC 4200W
Used
----
140
----
140 (not to exceed Total Maximum Available = 2728)
The 1400 W DC power supply works with a variety of DC sources. The DC input can vary from
300 W to 7500 W. Refer to the power supply documentation for additional information.
The supervisor engine cannot detect the DC source plugged into the 1400 W DC power supply. If
you are using the 1400 W DC power supply, use the power dc input command to set the DC input
power. For more information on this command, see the
Supply" section on page 12-18.
The software automatically adjusts between system power (for modules, backplane, and fans) and
PoE. Although PoE is 96 percent efficient, system power has only 75 percent efficiency. For
example, each 120 W of system power requires 160 W from the DC input. This requirement is
reflected in the "Power Used" column of the output for the show power available command.
The 1400 W DC power supply has a separate power on or off switch for PoE. The power supply fan
status and main power supply status are tied together. If either of them fails, both the power supply
and its fan report as bad/off. You should verify that the main power is on before turning on the power
for the inline switch. In addition, you should verify that the power for the inline switch is off before
turning off the main power.
Chapter 12
110V good
good good
110V good
110V good
: 2 Maximum Inputs = 3
Maximum
Available
---------
2400
0 2000
0 40
---------
Purpose
Enters configuration mode.
Environmental Monitoring and Power Management
good
"Configuring the DC Input for a Power
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