Study On Flex E Physical Layer Mapping And Its Implementation In PGA

5G services have multiple scenarios and differentiated features,so they require more throughput,more types of services,and higher efficiency.When transmitting the service data,the traditional bearer network often mixes the services in the physical layer.In order to provide the application requirements for the vertical industry,the 5G bearer network constructs independent end-to-end logical channels for different types of services by slicing on the same physical network.As one of the hard-slicing technologies,the FlexE technology can solve the problem of excessive cost of multiple high-speed interfaces because it can bundle interfaces of different rates at the physical layer and carry multiple services under one IP network.For each type of service,dedicated resources such as network bandwidth,quality of service,and security can be fully guaranteed.Because services are isolated from each other,transmission errors within one service do not affect the communication of other services.And the resources within each business can be managed by their own customer.This not only ensures efficiency,but also saves costs and improves system throughput.The essay first studies the FlexE protocol,briefly introduces the composition of the FlexE Shim layer defined in the protocol and its implementation basis-100 G BASE-R Ethernet PCS layer,and studies the mux and demux functions of FlexE on account of the Caledar transmission mechanism.On this basis,the implementation scheme and functional model of FlexE Shim layer mapping to 100 G PHY are proposed.The functional model decomposes the FlexE Shim layer into several functional modules: the 64B/66 B codec module,the multiplexing and demultiplexing module based on the Calendar mechanism,and the overhead insertion and extraction module.The time slot allocation and mapping of flexible Ethernet during transmission,efficient reading,transmission of overhead modules,and alignment are studied in detail.Finally,the signals are aggregated to the user side of the MAC layer for data exchange.Then,from the signal point of view,the key modules were logically designed using Verilog HDL language and simulated with Questa Sim simulation tool.The complete system can distribute the different rates and different kinds of services of the MAC layer to different time slots for transmission and then map to the PHY through PMA loopback.This design has great reference value for the research of 100 G flexible Ethernet mapping and the development of related equipment.