Cisco PWR-4502= Power Supply Unit Battery And Power Supply

Cisco Catalyst 4500 E-Series External AC Power Shelf and 1400-WDC Power Supply with Integrated Power Entry Module

The Cisco Catalyst 4500 E-Series external AC power shelf must be used in conjunction with the 1400-WDC-P power supply. In addition to providing power for the chassis, fans, and non-PoE line cards, the 1400-WDC power supply contains a power entry module (PEM). The PEM is used to pass additional power through 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-WDC power supply can accept up to 7500 WDC for data and PoE applications. Up to 1400W can be dedicated for data (supervisor[s], fan tray, etc.), while the remaining power is passed through the PEM and is used for PoE.
When only one external AC power shelf is used (with two 2500-WAC power supplies), it provides the 1400-WDC power supply with 5000W of DC power. When two AC power shelves are strapped together, the Cisco Catalyst 4500 Series can provide up to 7500W of DC power (3 + 1 redundant).