Special Considerations For The 1400 W Dc Power Supply - Cisco Catalyst 4500 series Administration Manual

Chapter 13 Environmental Monitoring and Power Management
Power supplies currently available : 2
Power Summary
(in Watts)
----------------------
System Power (12V)
Inline Power (-50V)
Backplane Power (3.3V)
----------------------
Total

Special Considerations for the 1400 W DC Power Supply

Do not mix the 1400 W DC power supply with any other power supply, even for a hot swap or other
Caution
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
Step 2
Switch(config)# power dc input watts
Step 3
Switch(config)# end
The same configuration is applied to both power slots. For example, if you set the dc power input to
1000 W, the switch expects 1000 W as the external DC source for both slot 1and slot 2 (if present).
The following example shows how to set the external DC power source to 1000 W:
Switch# configure terminal
Switch (config)# power dc input 1000
OL_28731-01
Used
----
1323
----
1363 (not to exceed Total Maximum Available = 7412)
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 13-21.
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.
Maximum
Available
---------
2646
0 6022
40 67
---------
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
Power Management
"Configuring the DC Input for a Power
Purpose
Enters configuration mode.
Sets the capacity of the DC input source.
Exits configuration mode.
13-21