The Cisco Catalyst 4500 Series offers a variety of power supplies and accessories to meet the diverse needs of Enterprise and Service Provider customers. The Cisco 1400W internal DC power supply option meets the power needs of all Cisco Catalyst 4500 Series configurations. The 1400W DC power supply can accept 7500W DC from either a direct connection to a DC power plant or from the new external AC power shelf. In addition to providing power for the chassis, fans, and non inline-powered line cards, the 1400W DC power supply contains a Power Entry Module (PEM). The PEM is used to pass-through additional power to the chassis backplane-power demanded by the inline-power line cards. The chassis power trace used for inline power is independent from the one used by the Supervisor(s), fan tray, and backplane components. The 1400W DC Power Supply can provide up to 1400W of incoming power for data applications (Supervisor(s), fan tray, and so on). The remaining power is passed through the power supply via the PEM and placed on the inline-power trace.