With the development of fiber optic cable technology, transmitting relay protection signal through optic cable are getting more and more popular.
随着光纤技术的迅猛发展，利用光纤传输继电保护信号，已获得了业内人士的普遍欢迎。
The invention also provides a system for transmitting data in mobile communication, wherein, the base station and more than one relay stations are contained in the cell;
本发明还提供了一种移动通信中传输数据的系统，在小区中包括一个基站以及一个以上中继 站；
732 medium- and short-wave broadcasting transmitting and relay stations, covering 92.1 percent of the population;
共有中、短波广播发射台和转播台732座，广播综合人口覆盖率达到92．1％；
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