What are the commonly used network transmission media?

The network transmission medium is the physical pathway between the sender and the receiver in the network, which has a certain impact on the data communication of the network. Commonly used transmission media are: twisted pair, coaxial cable, optical fiber, wireless transmission medium.

The network transmission medium is the carrier that transmits information in the network, and the commonly used transmission medium is divided into two categories: wired transmission medium and wireless transmission medium.

(1) wired transmission medium refers to the physical connection between the two communication devices to achieve the part, it can transmit the signal from one side to the other, wired transmission medium mainly twisted pair, coaxial cable and optical fiber. Twisted pair and coaxial cable transmission of electrical signals, optical fiber transmission of optical signals.

(2) Wireless transmission medium refers to the free space around us. We can achieve a variety of wireless communications by utilizing the propagation of radio waves in free space. Electromagnetic waves transmitted in free space can be categorized into radio waves, microwaves, infrared, lasers, etc., based on their frequency spectrum, and information is loaded on the electromagnetic waves for transmission.

A transmission medium is required for any information transmission and **** enjoyment, and computer networks are no exception. For the average computer network user, it may not be necessary to know too many details, such as what medium computers rely on for transmitting information to each other and in what encoding. However, for network designers or network developers. However, for network designers or developers, it is necessary to understand the underlying structure and workings of the network, because they must know how fast information decays when it is transmitted in different media and how to correct transmission errors when they occur. This section focuses on the various communication media used in computer networks and their related communication characteristics.

When deciding which transmission medium to use, it is important to match the networking requirements with the characteristics of the medium. This section describes the characteristics associated with all modes of data transmission. Later, you will learn how to select the right media for your network. In general, there are five characteristics that must be considered when choosing a data transmission medium (listed roughly according to importance): throughput and bandwidth, cost, size and scalability, connectors, and noise immunity. Of course, every networking situation is different; characteristics that are critical to one organization may be irrelevant to another, and you need to determine which aspect is most important to your organization.