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Chapter 1 Product Overview
Power Supplies
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Catalyst 4500 Series Switches Installation Guide
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For a 1400 W DC power supply, the main power switch has an input range of
–40.5 to –72 V DC, while the –48 V PoE operates over a range of –40.5 to
–56 V DC. The PoE either fails to start or shuts down if exposed to greater than
–56 V DC input. PoE recovers after you recycle input power within the proper
voltage range. If the PoE shuts down due to input overvoltage (greater than –56
V DC), the main converter section does not shut down.
The supervisor engine monitors the status of each power supply and provides a
status report through the switch software. For more details on how the supervisor
engine monitors the power supplies, refer to the “Environmental Monitoring and
Power Management” chapter of the Catalyst 4500 Series Switch Cisco IOS
Software Configuration Guide.
1400 W DC Triple-input Power Supply Operational Modes
The C4500 1400 W DC Triple Input SP Power Supply (data only) allows added
redundancy by providing terminals for two DC inputs rated at 15 A and one rated
at 12.5 A per power supply.
This power supply has five operational modes depending on the inputs receiving
power. When all three inputs are active, at input voltages greater than –44.0 V DC,
the power supply delivers 1400 W maximum total output. Table 1-8 provides
output information for these modes, given a single supply.
Table 1-8 Input Modes
Input
Mode
Input
Number Input Configuration
Maximum Total Output
Power
1 1 1 x 12.5 A 386 W @ –40.5 V DC
412 W @ –44.0 V DC
2 2 OR 3 1 x 15 A 466 W @ –40.5 V DC
495 W @ –44.0 V DC
3 1, 2 OR 3 1 x 12.5 A and
1 x 15 A
845 W @ –40.5 V DC
908 W @ –44.0 V DC
4 2, 3 2 x 15A 914 W @ –40.5 V DC
990 W @ –44.0 V DC
5 1, 2, 3 1 x 12.5A and
2 x 15 A
1294 W @ –40.5 V DC
1400 W @ –44.0 V DC