A multi channel data transmission card has been designed and implemented using synchronous optical transmission technique.
采用同步光传输技术，设计和实现了用于高速数据可靠传输的多通道数据传输卡。
Along with the wide spread of data-channel such as optical fiber in UHV transmission line protection, it is more important to improve protection's principle.
随着光纤等数字通道在高压输电线路保护中的逐渐推广应用，充分利用数字通道来完善成套保护的原理就显得尤为重要。
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