Available Power For Power Supplies; Power Management Limitations - Cisco WS-C2950SX-48-SI Configuration Manual

Understanding How Power Management Works on the Catalyst 4500 Series Switches

Available Power for Power Supplies

Table 28-1
Table 28-1 Available Power
Power Supply
1000 W AC
1300 W AC
1400 W DC
2800 W AC
1. The chassis power includes power for the supervisor engine(s), all line cards, and the fan tray.
2. The backplane consumes 10 W in both redundant and combined mode.
3. The backplane consumes 10 W in redundant mode.
4. The 1400 W DC power supply has 0.75 efficiency. The inline power has 0.96 efficiency.
5. The DC input can vary for the 1400 W DC power supply and is configurable. For more information, see the

Power Management Limitations

This section describes the power-management limitations for the Catalyst 4500 series switches.
Note To compute the power requirements and verify that your system has enough power, add the power that
is consumed by the supervisor engine(s), the fan trays, and the installed modules (including the inline
power). For more information, see the
•
•
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
28-4
lists the power that is provided by the power supplies for the Catalyst 4500 series switches.
Redundant Mode (W)
Chassis
Inline = 0
2
Chassis (max) = 1000
Inline (max) = 800
Chassis + inline + backplane < 1300
3
Chassis (min) = 200
Chassis (max) = 1360
Inline (max)
[Chassis (min) + backplane] / 0.75) *
0.96
Chassis = 1360
In-line = 1400
Management Limitations" section on page
You can set the power requirements for the installed modules to exceed the power that is provided
by the power supplies.
If you insert a single power supply into the switch and then set combined mode, the switch displays
this message:
Insufficient power supplies present for specified configuration
1
= 1000
4 5
= (DC input
28-4.
"Power Consumption for Modules" section on page
Chapter 28 Power Management
Combined Mode (W)
Chassis = 1667
Inline = 0
Chassis (min) = 767
Chassis (max) = 1667
Inline (min) = 433
Inline (max) = 1333
Chassis + inline + backplane < 2166
N/A
Chassis = 2473
Inline = 2545
.
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Release 8.1
"Power
28-9.
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