The TP-MS4G-VHP mid-span PoE power sources are used for supplying PoE and data to multiple devices from a central location such as an operations room or equipment cabinet. The PoE devices feature a separate data-in port coupled with a data out/PoE port. The PoE function is considered 4 Pair Passive PoE, which is sometimes referred to as ?High PoE.? The units support Gigabit Ethernet and are backward compatible to 10/100MB. The mid-span features Universal Voltage (UniVolt?) PoE outputs where the PoE voltage equals the input voltage. All ports will have the same PoE voltage. PoE DC Voltage (20V-60V) is supplied on pins 1,2 (V-), 3,6 (V+) and 4,5 (V+) and 7,8 (V-). The unit can accept + or ? voltage on input; however, the design is non-isolated. The maximum power output per port is 1.8A. The individual outputs are over current, over/under voltage and short circuit protected. The midspan is DIN Rail mountable with the included DIN Rail brackets.