The Baseline Dual Speed Hub has 24 auto-sensing ports, which automatically detect the speed of the attached device and optimize network performance at either 10 Mbps or 100 Mbps. The SuperStack II Baseline Dual Speed Hub is unmanaged and works straight out of the box. Theres no need to set network speed. At last, plug and play that is truly plug and play! 24 RJ-45 10BASE-T/100BASE-TX connections. Auto sensing on each portautomatically senses the speed of the network device at the other end of the cable and optimizes performance. Integrated Ethernet to Fast Ethernet switch provides seamless integration between 10 Mbps and 100 Mbps segments. Conforms as a Class II Fast Ethernet repeater, which means that two SuperStack II Baseline Dual Speed Hubs can be cascaded in series (the maximum allowed according to the Fast Ethernet specification). MDI/MDIX switchable port allows for simple cascading of hubs without the need for a special crossover cable. 19 size for easy installation in a wiring closet. A rackmounting kit is supplied. The product can also be used free-standing. Diagnostic LEDs indicate port status, network traffic, and collisions on 10 Mbps and 100 Mbps segments, making it easy to spot-check faults and check individual port status. Connection for the SuperStack II Advanced Redundant Power System provides ultimate protection against network downtime.