Cudy GS2048PS4-720W 48-Port Managed Gigabit POE+ Layer 2 Switch with 4 10G SFPHigh Quality TPS PoE chipset inside ensure High performance and stable operation of the product. The port power prioritization technology ensures the continuous power supply of the key nodes. Supports up to 128 aggregation groups, each group supports up to 8 ports Control number of port based MAC address learning. Fully compatible with CISCO's UDLD protocol. Specification Conforms to IEEE802. 3, IEEE 802. 3u, IEEE802. 3ab, IEEE802. 3x, IEEE802. 3z,