Multiplexing and Demultiplexing of High-Speed Serial Links with MoSys LineSpeed™ Flex PHY
Thursday October 22, 2020By Scott Irwin
Vice President, LineSpeed Products
MoSys, Inc.
The MoSys MSH420 and MSH422 devices support a “Mux/Demux” mode which allows two lower-speed serial links to be multiplexed together to form a single link at twice the baud rate. This is illustrated in the figure below, where the two 12.5Gb/s serial links are multiplexed to a 25Gb/s link. This “bit-level” mux/demux function is agnostic to the data payload of the two lower-speed links, however they must be operating at the same baud rate (i.e. “0 ppm” frequency offset). Up to 5 bidirectional channels of 2:1 Mux/Demux function are supported in a single device (MSH420).
An example use case of the Mux/Demux function is the transport of a 40Gb Ethernet stream. A typical implementation carries the 40GbE link across 4 physical lanes, each operating at 10.3125Gb/s. The Mux/Demux allows link transport across only two serial lanes at 20.625Gb/s, as show in the following figure. This can be use in conjunction with either a 40GbE host or with a peer MSH420/MSH422 device.
Features and benefits of the MSH420/MSH422 Mux/Demux device include:
The MSH420 and MSH422 devices are the perfect solution for either reducing the number physical links required to transport a given amount of payload or doubling the payload transport for the same number of lanes.
Additional Resources:
If you are looking for more technical information or need to discuss your technical challenges with an expert, we are happy to help. Email us and we will arrange to have one of our technical specialists speak with you. You can also sign up for updates. Finally, please follow us on social media so we can keep in touch.
