INTEGRATED 10/100/1000M/2.5G ETHERNET CONTROLLER FOR USB 3.0 APPLICATIONS ( Supports Realtek Dragon SW for bandwidth control )

General Description

The Realtek RTL8156BG-CG/RTL8156BSG-CG (hereafter referred to as the RTL8156B(S)G (except where differences exist) 10/100/1000M/2.5G Ethernet controller combines a four-speed IEEE 802.3 compatible Media Access Controller (MAC) with a four-speed Ethernet transceiver, USB 3.0 bus controller, and embedded memory. With state-of-the-art DSP technology and mixed-mode signal technology, the RTL8156B(S)G offers high-speed transmission over CAT 5e UTP cable or CAT 3 UTP (10Mbps only) cable. Functions such as Crossover Detection and Auto-Correction, polarity correction, MDI swap, adaptive equalization, cross-talk cancellation, echo cancellation, timing recovery, RFI protection, thermal management, loopback diagnostic capability, and error correction are implemented to provide robust transmission and reception capabilities. The RTL8156B(S)G features embedded One-Time-Programmable (OTP) memory that can replace the external EEPROM (93C46/93C56/93C66).

Only the RTL8156BSG provides a built-in switching regulator.

The RTL8156B(S)G features USB 3.0 to provide higher bandwidth and improved protocols for data exchange between the host and the device. USB 3.0 also offers more advanced power management features for energy saving. The RTL8156B(S)G is compatible with the IEEE 802.3u specification for 10/100Mbps Ethernet, the IEEE 802.3ab specification for 1000Mbps Ethernet, and the IEEE 802.3bz specification for 2500Mbps Ethernet.

Advanced Configuration Power management Interface (ACPI)—power management for modern operating systems that are capable of Operating System-directed Power Management (OSPM)—is supported to achieve the most efficient power management possible. In addition to the ACPI feature, remote wake-up (including AMD Magic Packet and Microsoft Wake-Up Frame) is supported in both ACPI and APM (Advanced Power Management) environments.

The RTL8156B(S)G supports Microsoft Wake Packet Detection (WPD) to provide Wake-Up Frame information to the OS, e.g., PatternID, OriginalPacketSize, SavedPacketSize, SavedPacketOffset, etc. WPD helps prevent unwanted/unauthorized wake-up of a sleeping computer.

The RTL8156B(S)G supports ‘RealWoW!’ technology to enable remote wake-up of a sleeping PC through the Internet. This feature allows PCs to reduce power consumption by remaining in low power sleeping state until needed.

Note: The ‘RealWoW!’ service requires registration on first time use.

The RTL8156B(S)G supports Protocol offload. It offloads some of the most common protocols to NIC hardware in order to prevent spurious wake-up and further reduce power consumption. The RTL8156B(S)G can offload ARP (IPv4) and NS (IPv6) protocols while in the D3 power saving state.

The RTL8156B(S)G supports the ECMA (European Computer Manufacturers Association) proxy for sleeping hosts standard. The standard specifies maintenance of network connectivity and presence via proxies in order to extend the sleep duration of higher-powered hosts. It handles some network tasks on behalf of the host, allowing the host to remain in sleep mode for longer periods. Required and optional behavior of an operating proxy includes generating reply packets, ignoring packets, and waking the host.

The RTL8156B(S)G supports IEEE 802.3az-2010, also known as Energy Efficient Ethernet (EEE). IEEE 802.3az-2010 operates with the IEEE 802.3 Media Access Control (MAC) Sublayer to support operation in Low Power Idle mode. When the Ethernet network is in low link utilization, EEE allows systems on both sides of the link to save power.

The RTL8156B(S)G is compatible with Microsoft NDIS5, NDIS6 (IPv4, IPv6, TCP, UDP) Checksum and Segmentation Task-offload (Large send and Giant send) features, and supports IEEE 802.1P Layer 2 priority encoding and IEEE 802.1Q Virtual bridged Local Area Network (VLAN). The above features contribute to lowering CPU utilization, especially benefiting performance when in operation on a network server.

The maximum supported jumbo frame length of the RTL8156B(S)G is 16384 bytes.

The RTL8156B(S)G is suitable for multiple market segments and emerging applications, such as desktop, mobile, workstation, server, communications platforms, docking station, and embedded applications.



  • Integrated 10M BASE-Te and 100/1000M/2.5G transceiver
  • Supports 2.5G and 1G Lite mode
  • Auto-Negotiation with Extended Next Page (XNP) capability
  • Compatible with NBASE-TTM Alliance PHY Specification
  • Supports pair swap/polarity/skew correction
  • Crossover Detection & Auto-Correction
  • Configurable MDI port ordering (MDI swap) for easy PCB layout
  • Supports USB 3.0 and 0
  • Supports CDC-ECM
  • Supports CDC-NCM
  • Supports LPM (Link Power Management), U1/U2/U3 at SuperSpeed, and L1/L2 at HighSpeed
  • Embedded OTP memory
  • Supports hardware CRC (Cyclic Redundancy Check) function
  • Transmit/Receive on-chip buffer support
  • Supports 25MHz Crystal or external Oscillator
  • Built-in switching regulator (RTL8156BSG only)
  • Generate reference clock from Crystal
  • Supports power down/link down power saving
  • Supports Customizable LEDs
  • Controllable LED Blinking Frequency and Duty Cycle
  • Self-Loopback diagnostic capability
  • Thermal management
  • 56-pin QFN ‘Green’ package
  • LAN disable/Link state with GPIO pin
  • Supports ECMA-393 ProxZzzy Standard for sleeping hosts (see Note 1)
  • Wake-On-LAN and ‘RealWoW!’ Technology (remote wake-up) support (see Note 1)
  • EEPROM Interface
  • SPI Flash Interface – supports auto-install driver
  • Supports WakeUp pin in on-board system

Note 1: Select between RealWoW! or ECMA; only one feature can be active at a time

  • TWSI Interface


  • Compatible with IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
  • Supports IEEE 802.1P Layer 2 Priority Encoding
  • Supports IEEE 802.1Q VLAN tagging
  • Supports IEEE 802.3az (Energy Efficient Ethernet)
  • Supports IEEE 802.3bz (2.5GBASE-T)
  • Supports Full Duplex flow control (IEEE 802.3x)

Software Offload

  • Microsoft NDIS5, NDIS6 Checksum Offload (IPv4, IPv6, TCP, UDP) and Segmentation Task-offload (Large send v1 and Large send v2) support
  • Supports jumbo frame to 16K bytes
  • Supports Protocol Offload (ARP & NS)

Microsoft AOAC (Always On Always Connected)/Modern Standby

  • Supports 32-set 128-byte Wake-Up Frame pattern exact matching
  • Supports link change wake up
  • Supports Microsoft WPD (Wake Packet Detection)

Intel CPPM (Converged Platform Power Management)

  • Supports L1 with 3ms BESL (USB 2.0)
  • Dynamic LTM messaging (USB 3.0)
  • Supports U1/U2/U3 (USB 3.0)
  • Supports selective suspend

Realtek Dragon Software

  • Smart Auto Adjust Bandwidth Control
  • Visual User Friendly UI
  • Visual Network Usage Statistics
  • Optimized Default Setting for Game, Browser, and Streaming Modes
  • User Customized Priority Control


  • USB 10/100/1000M/2.5G Ethernet on Motherboard, Notebook, or Embedded systems