The Realtek RTL8411B/RTL8411BN is a highly integrated controller combining Gigabit Ethernet and multi-format card reader functions on a single chip. It supports 10/100/1000Mbps networking via an IEEE 802.3-compliant MAC and transceiver, connected through a PCIe 1.1 interface. The integrated card reader handles SD, MMC, and Memory Stick formats. Features include embedded OTP memory, ACPI power management, Wake-on-LAN, MSI/MSI-X interrupts, and Energy Efficient Ethernet (IEEE 802.3az). Protocol offload and proxy support for sleeping hosts further reduce power consumption while maintaining network presence in modern desktop and notebook systems.