System designers face a never-ending challenge of increasing system throughput and density. By aggregating two lower speed serial links together with a serial Mux/Demux device, designers can:

  • Halve the required number of physical lanes for the same throughput
  • Double system throughput with the same number of physical lanes or pins

The below diagram illustrates how pairs of 12.5Gb/s links are combined to form a bidirectional 25Gb/s link. An example application includes multiplexing the 4x10G lanes of a 40GbE link to 2x20G, thus either doubling the density of 40Gb Ethernet ports
or halving the number of signals.


  • Supports industry communication standards
  • Protocol independent data payloads for datacom, telecom, storage, or other applications
  • Strong signal integrity ensuring reliable data transfer
  • Support Forward Error Correction (FEC) payloads for high-reliability
  • Package and power options supporting line card, daughter card and module applications are key to system integration, power and heat issues


The MoSys MSH420S device is an ideal solution for multiplexing and demultiplexing high-speed serial links.

  • Two serial links transported across a single faster (2x) serial link provides:
    • Half the required number of physical lanes for the same payload
    • Double the payload for same number of physical lanes
  • Up to 5, Bi-directional, Mux/Demux channels in a single MSH420 device
    • Or up to 2 channels in a single, smaller MSH422S device (contact factory)
  • Supports critical industry standards, such as:
    • IEEE and OIF 10G, 25G, 40G and 100G standards
    • Protocol independent payload supports Datacom, Telecom, Storage applications
  • Independent PLLs per lane support different data rates per Mux/Demux channel within a single device
  • Signal integrity is key to ensuring reliable transfer of data
    • MoSys self-adapting RX equalizers for ease of connection
    • Reduce board design and bring-up time by eliminating per-lane “tuning”
  • Cost/performance must be considered in any system design:
    • Some devices are available in volume at less than $50 each


  • Mux/Demux of serial links can double the throughput or halve the number signals in your system design.
  • Adherence to industry standards for interoperability with other available industry devices
  • Strong signal integrity and package/power options support cable, backplane, printed circuit boards and module level solutions.


  • Datacom, Telecom, 5G Networks
  • Datacenter and Cloud Interconnects
  • Storage and Data Acquisition Systems

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