基于FPGA的数字直放站链路切换设计

Design of the link switching of digital repeater based on FPGA

针对数字光纤直放站系统的远端单元给出了一种简单高效的链路切换设计方案。首先对通信链路进行检测,其次切换同步时钟,最后改变物理接口与上下行数据的映射关系,并使用FPGA进行实现。实验平台测试表明,在光纤故障和设备故障等通信链路故障时,通过链路切换实现了环网自愈,系统组网更为灵活,大大提高了系统的可靠性,可应用于安全性要求高的场合。

This paper proposed a simple and efficient link switching scheme for remote unit （RU） in digital fiber repeater. The key steps are as follows. Firstly, the proposed system detects communication links, and then switches the synchronous clock. Finally, the system changes mapping relation between physical interfaces and uplink and downlink data. The whole process is realized by FPGA. Experimental results show that when communication link failure （e.g., fiber failure and equipment failure） happens, ring network can be recovered by switching link. This link switching scheme makes system networking more flexible, and increases the reliability of system. This scheme can be used in the situation which requires high security.