Tp-link TL-SG108PE, Protocols IEEE 802.3i, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3af, IEEE 802.3x, IEEE 802.1q, IEEE 802.1p, Interface 8 10/100/1000Mbps RJ45 Ports AUTO Negotiation/AUTO MDI/MDIX, External Power Adapter 100VAC ~ 240VAC (Output: 48VDC / 1.25A), Capacity 16Gbps, MAC Address Table 4K, Buffer 1.5Mb, Jumbo Frame15KB. 4 of the 5 Auto-Negotiation RJ45 ports (Port 1 to Port 4) of the switch support Power over Ethernet (PoE) function. These PoE ports can automatically detect and supply power with those IEEE 802.3af compliant Powered Devices (PDs).