通信线路

Therefore, in order to ensure the transmission quality, reliability and economical efficiency, we must master the rainfall attenuation influence of earth station setting areas accurately while the designing the earth-space satellite communication links.

因此，在设计地—空卫星通信线路时，为了保证通信系统传输质量、提高可靠性及经济性，就必须要准确地掌握地面站设置区域的降雨衰减所产生的影响。

This paper constructs a new practical distance learning system that is low cost and high speed by the means of satellite LOG combining with ground connection well.

因此，本论文从实用角度出发，充分考虑各教育部门的现状，通过高速卫星通信线路和地面低速线路的

The big disadvantage of this correspondence is the LOC can not be too long and the remote control is unable achieved.

这种通信方式的最大缺点是通信线路不能太长，无法实现远程控制的需求。

Developing the LOC patrol system can greatly improve the management and efficiency of patrolling LOG.

开发通信线路巡检系统对提高线路巡检的管理水平和效率具有重要的意义。

A logical communications circuit that is established only for the duration of communications.

逻辑通信线路，仅在通信发生时建立。

So data communication through power line need not to impropriate wireless channel resources and pave definite-purpose communication line. It also can take full advantage of electric facilities and exert power resources.

利用它进行数据通信，传递各种信息，不占用无线频道资源，亦无需铺设专用通信线路，省工、省钱、维护简单，从而能够充分利用电力设施，发挥电力资源优势，发展电力通信产业。

And also widely using in the power management system,technology aytomation control system,distant control system,brained space and so on .

利用电力线作为通信媒介，无需另外架设通信线路，也不占用现有的频谱资源。

Power line ; communication line ; underground pipeline ; induced current ; damage effect ; screening.

电力线路；通信线路；地下金属管道；感应电流；危险影响；屏蔽

At first, an outer surface electric intensity integral equation, involving the resistive coupling of earth, is put forward for the buried finite-length conductor segment.

本文研究通信线路附近存在金属导体系统时，电力线路对通信线路的电磁危险影响问题，本文研究内容和结果如下： 1。

Adopting multiplexing technique and making use of communication line between CSC and CS to achieve simultaneous transmission of ISDN signal and electric power. According to the variation of circuit equivalent resistance to design detection circuit, which can judge that the line is short circuit or open circuit and the commercial power is working normally or failure. When the reserve power supply is working, the system judges its operation status by voltage and current detection circuit. Making use of the characteristic of the gas discharge tube to achieve suspension system detection of power line touching. Transmitting information collected up to PC by RS485 for the purpose of centralized monitoring.

采用复用技术，利用基站控制器和基站间的通信线路实现ISDN信号和电力的共同传输；根据线路等效电阻的变化设计探测电路，来判断开路、短路、市电供电、市电停电等情况；在后备电源工作时，通过电压、电流采样电路判断电源的运行情况；利用气体放电管的特性实现悬浮系统动力线搭接的检测；采用RS-485通信方式将采集到的现场信息上传以实现集中监控。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。