Power Supply Unit Management in Network Devices

Devices, systems, methods, and processes for operating a plurality of power supplies of a network device using cold redundancy are described herein. Traditionally, redundant power supplies are operated in parallel with primary power supplies, thus making power supply system less efficient. To address these issues, an analog architecture is provided for implementing cold redundancy in a network device. Each power supply includes two pins: one for designating the power supply as primary or secondary, and the other pin for configuring an activity state of the power supply. The activity state can be an active state or a sleep state. The secondary power supplies are further ranked in an order of priority using different voltage levels for assignment. In response to surge in load demand, activity states of one or more secondary power supplies are changed to the active state without requiring a signal from a centralized control software.