Fiber-optic cable, twisted pair, cable difference

In the network hardware, there is a class can not be ignored is the network transmission medium, and we often referred to as network cable. Currently the more common twisted-pair cable broken down into small, fiber-optic cable, coaxial cable and coaxial cable and other coarse.

1 fiber-optic cable

Is a new generation of fiber-optic cable transmission medium, medium, compared with copper, fiber, whether in security, reliability, or network performance has greatly improved. In addition, the fiber transmission bandwidth far beyond copper cable, and its support for the maximum connection distance of up to two kilometers, is the formation of large-scale networks, the inevitable choice. As the fiber optic cable has good resistance to electromagnetic interference, confidentiality, speed, transmission capacity, etc., so its price is relatively expensive, rarely used in domestic situations. Currently, there are two more common types of fiber, respectively, single-mode fiber and multimode fiber (so-called "mold" refers to a certain angle into the fiber of a beam of light). Multimode fiber is generally used for the same office building or an area relatively close to the network connection. The single-mode fiber transmission of data of higher quality, longer transmission distance is usually used to connect geographically dispersed offices or between a wider network. If you use fiber optic cable as the network transmission medium, the need to increase the end transceivers, optical equipment, so the cost of investment in larger, less in general use applications.

2 twisted pair

Twisted-pair cable is a flexible communications, including a pair of insulated copper wire, which is characterized by cheap, it is widely used, such as our common telephone lines. Based on the maximum transmission rate of the different twisted pair can be divided into three categories, Category 5 and 5e. Category 3 twisted-pair rate is 10mb / s, 5 classes of up to 100mb / s, while Category 5 is as high as 155mb / s or more, you can fit the needs of the future of multimedia data transmission, it is recommended to use Category 5 or 5e double wire. Twisted-pair shielded twisted pair can be divided into (stp) and unshielded twisted pair (utp). Although the lower rate stp twisted pair (only 4mb / s), but the strong anti-interference ratio utp twisted pair, so the price should be a lot more expensive, and now these twisted a few dollars cheaper one meter, the thing may be your more than ten million or more to buy a meter. In contrast, utp twisted pair generally cost around $ in m 1, is relatively low. In addition, commonly used in 10m and 100m unshielded twisted pair is the popular name for 10base-t and 100base-t, we can often be seen in the market. And also supporting the use of twisted pair rj45 crystal head, for the production of twisted-pair interface between the network adapter rj45 connector, its quality is directly related to the stability of the entire network, can not be ignored.

3 coaxial cable

Coaxial cable is more familiar with a lot of friends of a class of transmission medium, it is by layers of insulated wire wrapped around the central copper conductor cable, it is most characteristic of anti-interference ability, stable transmission of data, and the price is cheap Therefore, once widely used, such as closed circuit television lines. However, before the coaxial cable used more, mainly because the bus structure composed of coaxial cable network costs low, but a single cable can cause damage to paralyze the entire network, maintenance is difficult, which is its biggest drawback. Ethernet applications is divided into thick coaxial cable coaxial cable (10base5) and thin coaxial cable (10base2) two. Now used much of the thick coaxial cable, thin coaxial cable and some markets. Thin coaxial cable is generally the market price a few dollars a meter, not too expensive. In addition, the coaxial cable is connected to the first and bnc, coaxial cable sold on the market are generally the first connection has been good and bnc finished, we can directly use.