The LineSpeed Flex 100G Octal Retimer with integrated RS-FEC (MSH221) supports up to 4 full duplex lanes (8 channels) with independent rates up to 28 Gbps for high data rate line card applications up to terabits per second. The flexible, multi-protocol SerDes device includes an option for the Clause 91 RS-FEC specified in 802.3bj for 4x25G NRZ interfaces. When the RS-FEC is turned off, the MSH221 device functions as a standard multi-rate and multi-protocol retimer capable of passing data whether encoded or non-encoded. Each lane is independent and supports a broad range of frequencies compatible with 10G, 25G, 40G and 100G Ethernet and OTN standards. With the 100G 802.3bj RS-FEC encode, decode and correction functions enabled, the device will encode data in one direction and decode and correct data (if needed) in the other direction. The IEEE 802.3bj RS-FEC enables additional signal integrity and/or distance capability over copper or optical interconnects and has been specified in multiple standards and MSAs.

The device provides equalization, clock and data recovery, and retransmitter for up to 8 lanes of serial traffic from 10-15G or 25-28G25 Gbps. It supports multiple on chip error checking and monitoring capabilities, reference clocks and ability to monitor the optional 100G RS-FEC status.

The device is packaged in a small 12x12mm FCCSP for module or daughter card applications. The device is pinout compatible to the MSH221 Octal Retimer with FEC.


Application Example


Key Features

  • Full duplex 100G retimer (8 lanes)
  • Includes 802.3bj Clause 91 RS-FEC (4x25.78G)
  • Support of IEEE and OIF 10, 25, 40 and100G standards for Ethernet and OTN
  • Self-adapting equalizer and eye opening capability
  • Transmitter and TX pre-emphasis
  • Per lane PRBS generator and bit error rate checker
  • Small 12x12mm package

Product Brief

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