Complies with IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3z, and IEEE 802.3x standards Provides 48 10/100/1000 Mbps Base-T Ethernet ports and support auto MDI/MDIX Provides 2 independent 1000 Mbps SFP slots and support 20 km long-distance networking Support 16 K MAC address table and MAC address auto-learning Support full duplex IEEE 802.3x flow control and half duplex back pressure flow control Support unblocked wire speed forwarding for all ports  Support 12 Mb large buffer queue Integrated professional lightning protection circuit offers 6 kV lightning protection for the built-in power supply and all Ethernet ports One-key VLAN function helps isolate broadcast storms effectively Feature a 19-inch/1U standard rack-mount shell design