electrophone

With the development of cable and wireless communications and through the comparison of the two transmission technology, this paper focuses on their relationship in the evolution of technology, and then through the graphical chart, illus trates the replacement of fixed-line voice services by mobile voice services, including their fierce competitions.

文中通过有线通信和无线通信的发展历程,对比两种传输技术的特点,着重体现两者在各自技术演进中的相互关系。

Research on wired/wireless di-network security and alarm system;

有线/无线双网安防报警系统建设的研究

Integrated Telecommunication System providing both wired access and wireless access for Group Users;

一种有线无线一体化的集团用户接入系统及其实现

Now the wired directional control system is often used in engineering for its more accurate controlling,which applies to big directiona.

有线控向系统控制精度高,适用于在大、中型定向钻机上进行深、长管道穿越。

As a result,a series of negative consequences will take place such as wire line wringing,wreathe of hose and wired MWD cables,and other downhole accidents.

在推广复合导向钻井技术及新型PDC钻头施工过程中,常常出现动力钻具产生的反扭矩带动钻具逆时针旋转现象,使钻机大绳打扭,将水龙带、有线随钻电缆等缠绕在一起,导致电缆损坏,耽误生产以及导致井下复杂情况发生等严重后果。

Analysis of data transmission interrupt produced by wire shooting of seismograph and improving measures.;

地震仪有线放炮产生数传中断的分析及改进措施