The KSZ8031RNLI is an Ethernet physical-layer integrated circuit (PHY) from Micrel Incorporated. It is an IEEE 802.3u compliant Fast Ethernet PHY that supports speeds of 10/100 Mbps. The KSZ8031 RNLI is designed for use in consumer applications such as IP phones, mobile internet devices (MIDs), residential gateways, and consumer electronics products. It features automatic crossover detection, power-down, energy detect, and loopback mode. The device supports low power modes and two LED pins used for activity and link indication. The KSZ8031 RNLI has 10BASE-T/100BASE-TX MAC interface and MDI/MDI-X auto-detection. The low power TMII interface is also supported. The pin-count of the KSZ8031 RNLI is 20pin, and it comes in a SSOP package.