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Integrated 10/100/1000 Gigabit Ethernet Transceiver
General Description

This product is covered by one or more of the following patents:
US5,307,459, US5,434,872, US5,732,094, US6,570,884, US6,115,776, and US6,327,625.

The Realtek RTL8211B(L) is a highly integrated Ethernet transceiver that complies with 10Base-T, 100Base-TX, and 1000Base-T IEEE 802.3 standards. It provides all the necessary physical layer functions to transmit and receive Ethernet packets over CAT 5 UTP cable or CAT 3 UTP (10Mbps only) cable.

The RTL8211B(L) uses state-of-the-art DSP technology and an Analog Front End (AFE) to enable high-speed data transmission and reception over UTP cable. Functions such as Crossover Detection & Auto-Correction, polarity correction, adaptive equalization, cross-talk cancellation, echo cancellation, timing recovery, and error correction are implemented in the RTL8211B(L) to provide robust transmission and reception capabilities at 10Mbps, 100Mbps, or 1000Mbps.

Data transfer between MAC and PHY is via the Reduced Gigabit Media Independent Interface (RGMII) for 1000Base-T, and Media Independent Interface (MII) for 10Base-T/100Base-TX.

  • 1000Base-T IEEE 802.3ab Compliant
  • 100Base-TX IEEE 802.3u Compliant
  • 10Base-T IEEE 802.3 Compliant
  • IEEE 802.3 Compliant RGMII/MII
  • Supports Auto-Negotiation
  • Supports Parallel Detection
  • Crossover Detection & Auto-Correction
  • Automatic polarity correction
  • Transmit wave-shaping
  • DSP processing
  • Internal hybrids for 1000Base-T
  • Baseline Wander Correction
  • Supports half/full duplex operation
  • Transmission rate up to 1Gbps over industry standard CAT.5 UTP cable with BER less than 10-10 in 1000Base-T
  • The design transceiver capability target is up to 140m for CAT.5 cable in 1000Base-T
  • Supports 3.3V or 2.5V signaling for RGMII
  • Supports power down mode
  • Supports Link Down Power Saving
  • Supports 25MHz external crystal or OSC
  • Provides 125MHz clock source for MAC
  • Provides 6 network status LEDs
  • 64-pin QFN or 100-pin LQFP
  • 0.15µm process with very low power consumption
Network Interface Adapter, MAU (Media Access Unit), CNR (Communication and Network Riser), ACR (Advanced Communication Riser), Ethernet hub, Ethernet switch. In addition, it can be used in any embedded system with an Ethernet MAC that needs a UTP physical connection.


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