New! Hewlett-Packard Single-port 802.3at Gigabit PoE Midspan Power Supply. These are Gigabit POE Power supplies for any Power over Ethernet requirement where you do not have a POE switch. This unit goes between your existing Gigabit switch and the device requiring POE and this device will work with any 802.3af or 802.3at compliant devices. It is Gigabit (802.3at) but also backward compatible to 10/100 (802.3af).