Provide 1,600 W of AC power for Cisco NCS 57C3 systems with a chassis power supply module specified for the platform. NC57-1600W-ACFW= identifies the 1,600 W AC configuration, making the input-power type and power rating clear when matching a replacement or building out an NCS 57C3 chassis. It is a dedicated power component for the chassis rather than a network interface or routing module. The module uses port-side intake and front-to-back airflow. Airflow orientation is an important physical characteristic in router deployments because chassis cooling paths need to remain consistent with the surrounding rack and equipment layout. Selecting the stated airflow configuration helps maintain the intended direction of air movement through the power-supply area of the system. This NCS 57C3 power supply configuration is distinguished by its AC input, 1,600 W rating, and port-side intake/front-to-back airflow designation. Those characteristics separate it from power options that may use a different input type, power capacity, or cooling direction. Use it where the installed Cisco NCS 57C3 platform calls for this specific 1,600 W AC power and airflow arrangement.