Cisco Catalyst 4500-X 750W AC Back-to- Front Cooling Power SupplyIn enterprise networks and data centers, power reliability is as critical as data throughput. The Cisco Catalyst 4500 X 750W AC Back to Front Cooling Power Supply delivers a high efficiency, hot swappable solution purpose built for the Catalyst 4500 X chassis. Providing a steady 750W of AC power, this unit is engineered to work in harmony with the chassis cooling design, using back to front airflow to maintain stable temperatures even under peak load.