S3900-24F4S-R is an advanced Layer 2 Plus (Layer 3 Lite) Gigabit managed stackable switches with 8x 1G RJ45/SFP Combo, 16x SFP ports, 4x 10G SFP+ uplinks, dual redundant power supplies and dual fans design guarantees the stable operation of the switch, providing improved ease of use, highly secure business operations, improved sustainability, and a borderless network experience. The S3900 series switches support stacking capability with 1 and 10 Gigabit connectivity and advanced QoS to the network edge, while maintaining simple management. The S3900 series are ideal Gigabit access and aggregation switches designed for SMB, enterprise, midmarket, and branch office networks to provide lower total cost of ownership.