What are the transmission media commonly used in computer networks? In what network environment are they used?

Network transmission medium refers to the carrier that transmits information in the network. Common transmission media are divided into wired transmission media (twisted pair, coaxial cable and optical fiber, etc.). ) and wireless transmission media (radio waves, microwaves and infrared rays, etc. Different transmission media have different characteristics, and their different characteristics have great influence on the quality and speed of data communication in the network.

1 wired transmission medium

1, twisted pair is commonly used for point-to-point connection and multi-point connection.

It can be used to transmit analog or digital signals. Compared with other transmission media, twisted pair is limited in transmission distance, channel width and data transmission speed, but its price is lower. Usually used as a short-range transmission medium.

2. Coaxial cable can be used for point-to-point connection or multipoint connection.

There are two basic types of coaxial cable: baseband coaxial cable and broadband coaxial cable. Baseband coaxial cable is used to transmit digital signals, and broadband coaxial cable can transmit analog or digital signals. Used for transmission between devices over 500 meters.

3. Optical fiber transmits optical signals.

Optical signals carry user data. Optical fiber has the advantages of small optical signal attenuation, high bandwidth and strong anti-interference ability. Used for transmission between devices over 500 meters.

Two Common Wireless Media

Radio waves and microwaves

Wireless transmission does not need to lay a network transmission line, and the network terminal is convenient to move.