1-47
Catalyst 4500 Series Switches Installation Guide
78-14409-08
Chapter 1 Product Overview
System Architecture
4200 W of redundant data and PoE are required for a Cisco Catalyst 4500 Series
chassis in an AC-powered environment, Cisco offers an external AC power shelf
that houses two 2500 W AC power supplies. When two power shelves are
combined, they can produce 7500 W—the remaining 2500 W supply can be used
for N + 1 protection.
The Cisco Catalyst 4500 Series has two DC power options; one is optimized for
data-only deployments in service provider central offices (part number
PWR-C45-1400DC), and the other is used for high-power PoE deployments (part
number PWR-C45-1400DC-P).
Cisco Catalyst 4500 Series External AC Power Shelf and
1400 W DC Power Supply with Integrated Power Entry Module
The external AC power shelf must be used in conjunction with the 1400 W DC
power supply. In addition to providing power for the chassis, fans, and non-PoE
line cards, the 1400 W DC power supply contains a power entry module (PEM).
The PEM is used to pass additional power to the chassis backplane, power
demanded by the PoE line cards. The chassis power trace used for PoE is
independent from the one used by the supervisor engine(s), fan tray, and
backplane components. The 1400 W DC power supply can accept up to
7500 W DC for data and PoE applications. Up to 1400 W can be dedicated for
data (supervisor engine, fan tray, etc.), while the remaining power is passed
through via the PEM and is used for PoE.
When only one external AC power shelf is used (with two 2500 W AC power
supplies), it provides the 1400 W DC power supply with 5000 W of DC power in
total. When two AC power shelves are strapped together, the switch can provide
up to 7500 W of DC power (3 + 1 redundant).
Cisco Catalyst 4500 Series Service Provider DC Power Supply
The triple-input 1400 W DC power supply is optimized for service provider or
central-office deployments. By providing multiple inputs, the service provider
DC power supply enables central-office technicians to customize the output
power to meet their application needs. Many central-office deployments require
only a fraction of the 1400 W available in the service provider power supply. Low
current inputs mean technicians can connect the supply to smaller fuses and
breakers. The service provider power supply makes it possible to deploy a Cisco
