Grandstream GWN7831 Enterprise Layer 3 Managed Aggregation Switch, 20 x SFP, 4 x SFP/GigE Combo, 4 x SFP+, Redundant PSU The GWN7830 series are Layer 3 aggregation switches that allow enterprises to build scalable, secure, high-performance, and smart business networks that are fully manageable and support maximum capacity. * 2/4