Design of Long-line High-speed Transmission Transceiver Module Based on PCM
In order to solve the transmission reliability problems of PCM signal with the increase of communication speed and distance,a long-line high-speed data transmission scheme based on PCM transceiver module is proposed in flight test.The design uses Kintex7 series FPGA of Xilinx as the control chip and differential line driver DS26C31 to drive the PCM code differential out-put to realize the logic level conversion,and uses the optocoupler FODM8071 for isolated communication to improve the high noise resistance of data receiving.In order to further ensure the accuracy and reliability of long-distance high-speed data receiving,the logic design of PCM code receiving unit is optimized,and the link status flag is observed in real time when the data is sent,and the link reconnection and retransmission mechanism is added when the transmission is abnormal,which solves the problem that PCM data is easy to lose when it is sent back.After a lot of tests,the circuit works stably and has strong anti-interference ability.It can re-alize the stable transmission of 30 m twisted-pair wire with the highest speed of 10 Mb/s.
FPGAPCMdecoding and receivingdifferential output drivehigh speed transmissionlink reconnection
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