Twisted pair is a kind of flexible communication cable, which contains a pair of insulated copper wires. It is characterized by low price, so it is widely used, such as our common telephone lines. According to the difference of the maximum transmission rate, twisted pair can be divided into 3 types, 5 types and super 5.
Fiber optic cables are a new generation of transmission media. Compared with copper media, optical fibers have greatly improved in terms of safety, reliability, and network performance. In addition, the bandwidth of optical fiber transmission greatly exceeds that of copper cables, and the maximum connection distance it supports is more than two kilometers, which is an inevitable choice for building a larger network. Because the optical fiber cable has the advantages of good anti-electromagnetic interference, strong confidentiality, fast speed, large transmission capacity, etc., its price is also relatively expensive, and it is rarely used in household occasions. At present, there are two different types of optical fibers that are more common, namely single-mode optical fibers and multi-mode optical fibers (the so-called “mode” refers to a beam of light entering the optical fiber at a certain angle). Multimode fiber is generally used for network connections in the same office building or in a relatively close area. The single-mode optical fiber transmits data with higher quality and longer transmission distance, and is usually used to connect office buildings or geographically dispersed networks. If optical fiber and cable are used as the network transmission medium, it is necessary to add equipment such as optical transceivers, so the cost investment is greater, and it is less used in general applications.