28-Port-Gigabit-Switch It features 24 auto-sensing 10/100/1000Mbps RJ45 ports, 2 10/100/1000Mbps uplink RJ45 ports, plus 2 1000Mbps fiber module slots. Each RJ45 port supports MDI/MDIX auto-crossover and wire-speed forwarding. Ports 1 to 24 support PoE power supply in compliance with IEEE 802.3af/at standards. As a Power Sourcing Equipment, it can automatically detect and identify standard-compliant Powered Devices and supply power over Ethernet cables. Designed for 19-inch standard rack mounting, it supports plug-and-play operation with no configuration required. Dynamic LED indicators provide straightforward status monitoring and troubleshooting. Four DIP switch modes are available, allowing users to enable or disable functions according to different application scenarios.