The Study Of Real-time Data Transmission Based On Optical Fiber Reflective Memory Network

This thesis puts forward a project of optical fiber Reflective Memory Network(RMN) to meet the real-time transmission demand of massive data in photoelectricmeasuring system. It first introduced the advantages of optical fiber communication,operating principle and real-time properties of RMN. Then, research status on RMNwas reviewed to clear the significance and methodology of this research subject.Firstly, by analyzing standard protocols based on the ISO/OSI (Open SystemInterconnection) reference model (RM), physical layer (PL) and data link layer (DLL)were taken as research emphasis of RMN custom protocol.Secondly, Xilinx Rocket I/O Transceiver was selected with contrast of differentsynchronous technologies. Then, the function of Rocket I/O module was introducedbriefly, and Rocket I/O Transceiver based on optical fiber was determined as thehigh-speed transmission scheme of PL. In addition, tests were conducted to evaluatethe bit error ration (BER) of this PL communication scheme.Furthermore, compared with connection-oriented communication, connectionlesscommunication was chosen in real-time application field, and an optical-bypass ringtopology was proposed to ensure the fault-tolerant reliability on the basis of logic ringwith star topology and reverse rotation dual ring topology. Then the DLL functionspecification of ISO/RM was tailored in accordance with the real-time transmissiondemand to define the DLL function standard in our custom RMN protocol model.In the end, RMN was implemented in VHDL and the function of relevant designmodules was explained. Besides, network tests were conducted when the functionsimulation had fulfilled expected goals.The test results show that the optical fiber RMN in this design can satisfy thereal-time indexes of high-speed with3.125Gbps, reliability with BER below10-15,and predictability with processing delay108.8ns while transmission delay192ns.Moreover, the analysis of test results reveals factors restricting the improvement ofthese indexes, and predicts the real-time transmission performance in theory.