3com Switch 7750 External PoE Power Rack 2500W Black,Silver power supply unit

Provisions Power for 3Com Switch 7750 PoE Support
The 3Com Switch 7750 External PoE Power Rack is an external rack-mounted power supply that provides DC power for Power over Ethernet (PoE) modules in the 3Com Switch 7758, 7757, and 7754 chassis.
One 2,500W PoE power supply is included. Up to two additional power supplies can be added for full chassis PoE port capabilities with N+1 power redundancy.
Cannot be used with the 3Com Switch 7708R or legacy Switch 7700 7-slot and 4-slot chassis. Chassis must be operating with the 3Com Switch 7750 96 Gbps Switch Fabric.
Provides DC power for Power over Ethernet modules in the 3Com Switch 7758 8-Slot, 3Com Switch 7757 7-Slot, and Switch 7754 4-Slot Chassis.
Up to two additional power supplies can be added for full chassis PoE port capabilities with N+1 power redundancy.