A pair of data optical fiber transmission equipment based on CPLD is designed and developed. The video, gigabit network, RS422 and other multi-channel data are formed into high-speed data stream, and then the multi-channel digital stream is carried out wavelength division multiplexing and transmitted through the transceiver integrated optical terminal machine. The receiving optical terminal is demultiplexed and restored to multiplex individual digital signals, At full load, one channel of video, two channels of gigabit networks and five channels of RS422 are transmitted. Duo to the complex application environment of the optical terminal computer, the state of bidirectional data transmission information needs to be reported in real time. In this paper, a real-time fault detection method is designed for the entire optical fiber transmission link. The video locking state of optical terminal machine, the output voltage state of linear voltage regulator and the transmission fiber between two optical terminal machines are monitored in real time and is applied to a certain type of vehicle photoelectric system. The fault location is accurate and timely, and the application effect is good.
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.
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