The Realtek RTL8309SB-LF is a layer 2 switch-on-a-chip (SoC) device that enables wire-speed performance in 10/100 Ethernet applications. It features a 10/100 Mbps MDI/MDX crossbar and a 5-port, 10/100 Mbps switch core with frame forwarding rate of up to 2.2Mpps. It also provides an advanced QoS feature set which includes a programmable queue scheduler, priority classes and 802.1Q/P VLANs. The RTL8309SB-LF integrates an RMON statistic engine and a MIB counter engine with an TMAC engine to achieve low power consumption, making it an ideal choice for embedded or low power applications. Additionally, features such as a diagnostic LEDs, JTAG port and embedded core processor for device configuration make the RTL8309SB-LF a cost-effective and easy to implement solution.