What are the three types of wired transmission media commonly used in computer networks?

The three commonly used wired transmission media in computer networks are twisted pairs, coaxial cables, and optical fibers. Twisted pair is the most commonly used transmission medium in comprehensive wiring projects; coaxial cable refers to a cable with two concentric conductors, and the conductor and shielding layer share the same axis; optical fiber is a cable made of glass or plastic Fibers can be used as light transmission tools.

The operating environment of this article: Windows 7 system, Dell G3 computer.

Computer network refers to the connection of multiple computers and their external devices with independent functions in different geographical locations through communication lines. Under the management and coordination of network operating systems, network management software and network communication protocols , a computer system that realizes resource sharing and information transfer.

Three types of wired transmission media commonly used in computer networks

1. Twisted pair

Twisted pair (TP) is a kind of comprehensive wiring The most commonly used transmission medium in engineering is composed of two copper wires with an insulating protective layer. Two insulated copper wires are twisted together at a certain density. The radio waves radiated by each wire during transmission will be offset by the radio waves emitted by the other wire, effectively reducing the degree of signal interference.

Twisted pair wire is generally made of two 22-26 gauge insulated copper wires twisted around each other, which is where the name "twisted pair wire" comes from. In actual use, twisted pairs are composed of multiple pairs of twisted pairs wrapped together in an insulated cable casing. If one or more pairs of twisted pairs are placed in an insulating sleeve, it becomes a twisted pair cable [1]. However, in daily life, "twisted pair cable" is generally called "twisted pair" directly.

Compared with other transmission media, twisted pair cables are subject to certain limitations in terms of transmission distance, channel width and data transmission speed, but the price is relatively low.

2. Coaxial cable

Coaxial cable (Coaxial Cable) refers to a cable with two concentric conductors, and the conductor and shielding layer share the same axis. The most common coaxial cable consists of copper wire conductors isolated by insulating material. Outside the inner layer of insulating material is another layer of ring conductors and their insulators. The entire cable is then sheathed by a polyvinyl chloride or Teflon material. .

Coaxial cables can be used for the transmission of analog and digital signals and are suitable for a variety of applications, the most important of which are television broadcasting, long-distance telephone transmission, short-distance connections between computer systems, and local area networks wait. Coaxial cable developed rapidly as a means of transmitting television signals to millions of homes, known as cable television. A cable TV system can carry dozens or even hundreds of TV channels, and its transmission range can reach tens of kilometers. Coaxial cable has long been an important component of long-distance telephone networks. Today it faces increasing competition from fiber optics, terrestrial microwave and satellites.

3. Optical fiber

Optical fiber is the abbreviation of optical fiber. It is a fiber made of glass or plastic and can be used as a light transmission tool.

The transmission principle is "total reflection of light".

If you want to read more related articles, please visit PHP Chinese website! !

The above is the detailed content of What are the three types of wired transmission media commonly used in computer networks?. For more information, please follow other related articles on the PHP Chinese website!