TP-Link TL-SG1024 Gigabit Network Switch (48.3 cm (19 inches), 24x 1000MBit / s RJ45 ports, fanless passive cooling concept) [Amazon Frustration-Free Packaging] (Personal Computers)
Very useful gigabit switch. If the cooling fan is a bit noisy for use in an office, may possibly be replaced by another (Warning, loss of warranty!) Otherwise net throughput with 950Mbit / s. Update 08/01/2015: The newer versions have now no fan more