On a line equipped with ATP as shown above, each block carries an electronic speed code on top of its track circuit.
在线被装备AT P依照被显示以上，各个块运载一个电子速度代码在它的轨道电路顶部。
The design of the communication and controlling circuit that transmits DTMF code in AC220 inphase power line is presented. It forms a complete system with data picking and processing circuit.
介绍一种利用220伏同相电力线载波传送dtmf编码数据的系统中的通讯及控制电路的设计，它与数据采集电路及数据处理电路构成一个完整的系统。
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