The Research And Implementation Of A Data Unit Mapping Method In Optical Transmission

In recent years, the business carried by communication networks has undergone tremendous changes. The rapid development of data services, especially the development of broadband, IPTV and video business, proposed new requirements of the transmission network of the operators.As a new type of optical transport network technology, OTN (Optical Transport Network, optical transport network) inherits the advantages of SDH and DWDM and develops a new transmission of large particles, multi-level of TCM and other new features. Therefore, OTN will be the next generation transmission network.This paper describes in brief the basis of OTN technology, by conducting a detailed analysis of the structure and rate of the ODU signals, OTN signals and TFI-5 bus (Time Division Multiplexing Fabric To Framer Interface, time division multiplexing structure to the framer interface bus).this paper proposes a method of optical data unit mapping, by block processing, which uses virtual containers C4_KC as an intermediate signal on the rate configuration rate of ODU1 and ODU2 client signal, and the conversion of data width, and ultimately mapps ODU1 and ODU2 client signal to bus TFI5.According to the proposed design method, this paper designs the overall circuit architecture of the mapping device, and defines the functions of each module, and use VerilogHDL language to complete RTL-level hardware description for each module of the design. Through the establishment of simulation platform, and the co-simulation of Modelsim and Debussy software, this design completes the functional verification. The design as a device connects the SDH business chip with the cross-device. Their codes are verified by Xilinx XC5VLX110 FPGA chip.Through the simulation and verification, results show that the clock frequency of the design meets the system requirements of the 311MHz. The design supports multiple user signals, and the structure of the circuit is simple. It can real-time detect errors, automaticlly recover and it is reliability. The technology can accelerate the development of OTN devices, and keep existing customers investment and promote the optical communication technology to the evolution of OTN network.