... Back PressureIEEE 802.3af Power Over EthernetIEEE 802.3at Power Over Ethernetswitching structureBack-plane( switch ) 1.0GbpsTransfer Rate ... POE04 switch )POE PINsSupport A B modePositive (VCC+) : RJ-45 pin 1,2,4,5Negative (VCC-) : RJ-45 pin 3 ... ,6,7,8Data (1,2,3,6)ProtocolsCSMA/CDPower supply External Power ... condensing Factory price 10/100M POE power switch 4 port