KEYWORDS: Telecommunications, Data communications, Design and modelling, Computing systems, Optical fibers, Data transmission, Data conversion, Optical communications, Data processing, Signal processing
Aiming at the characteristics of the self-designed and developed Fiber Tree Bus (FTB) terminal, such as more terminals, more interactive data and various node communication protocols, an intelligent data monitoring terminal is designed by using FPGA and QT software of host computer, a high-speed data transmission system is constructed, which is used to monitor and locate the data transmitted on the optical fiber bus. The system is divided into data transmission module, data analysis module, data transmission module receiving all data flow on fiber data bus, data analysis module caches all data, abnormal location. The test results show that the bus terminal satisfies the requirement of monitoring all terminal nodes on the self-designed FTB system, and the system runs RS422, gigabit network, CAN and other communication data. The monitoring terminal can receive all communication data, can locate the abnormal condition of each node, and the system runs smoothly.
KEYWORDS: Telecommunications, Data communications, Data transmission, Control systems, Data conversion, Data storage, System integration, Optical fibers, Field programmable gate arrays, Signal processing
Aiming at the characteristics of the self-designed and developed fiber tree bus (FTB) terminal, such as more terminals, more interactive data and various node communication protocols, This paper designs an efficient bus controller, a practical and efficient instruction list, and Constructs A high-speed data transmission system, which is used to manage and control the data transmitted on the fiber bus. FTB layered structure, bus topology and the performance of real-time transmission are introduced. According to the application requirements of military vehicle-borne photoelectric system, the model of photoelectric information transmission system based on FTB is built, and the transmission performance of FTB based on this bus controller is tested. The compared results of analysis and test show that, FTB has a variety of real-time information transmission capacity, but also verified that the bus controller is efficient and practical,Finally, Transmission Delay Index and information interaction index are analyzed and tested.
Optical fiber bus technology is an important research direction in communication systems of electronic devices in special vehicle platforms. According to the requirements for communication quality between devices in special vehicle platforms, an optical fiber bus based on gigabit passive optical network topology is proposed. A data cache-based predictive weighted interpolated polling dynamic bandwidth allocation method is presented and investigated for the optical fiber bus’s upstream bandwidth allocation. The network controller establishes a weighted buffer area for the communication requirements in the polling period according to the type and data volume of the network terminal (NT) data stream and dynamically allocates the bandwidth of each optical NT to better meet the communication requirements for different data within the special device platform. Verification is done by means of OPNET software simulation and the establishment of a NT simulation test system in the laboratory. This proves that the proposed dynamic bandwidth allocation algorithm can reduce the end-to-end delay of RS422 port data by more than 50% and meet the Ethernet and controller area network port data delay requirements.
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