网络传输介质分类
计算机网络中的传输介质 (Transmission Mediums in Computer Networks)
Data is represented by computers and other telecommunication devices using signals. Signals are transmitted in the form of electromagnetic energy from one device to another. Electromagnetic signals travel through vacuum, air or other transmission mediums to move from one point to another(from sender to receiver).
数据由计算机和其他电信设备使用信号表示。 信号以电磁能的形式从一个设备传输到另一个设备。 电磁信号通过真空，空气或其他传输介质从一个点移动到另一点（从发送器到接收器）。
Electromagnetic energy (includes electrical and magnetic fields) consists of power, voice, visible light, radio waves, ultraviolet light, gamma rays etc.
电磁能（包括电场和磁场）由功率，声音，可见光，无线电波，紫外线，伽马射线等组成。
Transmission medium is the means through which we send our data from one place to another. The first layer (physical layer) of Communication Networks OSI Seven layer model is dedicated to the transmission media, we will study the OSI Model later.
传输介质是我们将数据从一个地方发送到另一个地方的手段。 通信网络OSI的第一层（物理层）七层模型专用于传输介质，我们将在以后研究OSI模型。
选择传输媒体时要考虑的因素 (Factors to be considered while selecting a Transmission Medium)
- Transmission Rate 传输速率
- Cost and Ease of Installation 成本和易于安装
- Resistance to Environmental Conditions 抵抗环境条件
- Distances 距离
翻译自: https://www.studytonight.com/computer-networks/transmission-mediums
网络传输介质分类