Zyxel GS1920-48v2 Switch. 2 x GbE SFP slots. 48-port GbE Smart Managed Switch. 48 × GbE RJ-45 Ports. 4 × GbE combo ports. The GS1920v2 Series includes fanless and built-in smart fan models. The smart fan is designed to automatically adjust speeds based on the device temperature, starting at 26 dBA max at 25°C ambient with GS1920-48v2.
eBay