The OS6860-BP-PH is a modular AC PoE backup power supply. It provides system and PoE backup power to one 24-port PoE switch. This a 1+1 redundant, hot-swappable power supply. This supply unit is internal but removable to allow for easier maintenance and replacement. Also the power load-sharing for PoE between the primary and backup power supplies is supported to provide more power per switch. There is no interruption of service when another power supply is installed or an existing one replaced.