The Brocade ICX 6400-EPS1500 is an external power supply source to provide additional power to the Brocade ICX switches. It also can be used for system power redundancy and increased PoE/PoE+ power budget to enable additional PoE/PoE+ ports. Each Brocade ICX 6400-EPS1500 can connect up to three Brocade ICX 6430 and 6450 switches.