About Designed for use with Power over Ethernet (PoE) devices, the SD4P4 switch provides up to 15.4W of power to 802.af PoE compatible devices connected to the switch's PoE ports. The switch's ports automatically negotiate between 10BASE-T and 100BASE-TX network speeds, as well as between full and half duplex modes, so any port can connect to a Fast Ethernet or Ethernet network. The ports also support Auto-MDIX, meaning the switch can use both straight-through and cross-over cable regardless of what device is connected to it.