ASUS 5-Port Gigabit Green Switch and VIP Port (GX-D1051/V2) Green Network Technology: Link Down Mode, Cable Length Detection, 5 x RJ-45 10/100/1000 Mbps Ethernet ports Complies with IEEE 802.3 (10Base-T), IEEE 802.3u (100Base-TX), IEEE 802.3ab (1000Base-T) standards Supports IEEE 802.3x flow control for Full Duplex mode and back pressure for Half Duplex mode IEEE 802.1p QoS Prioritization Supports automatic address learning and address aging