In the network hardware, there is a kind of can not be ignored is the network transmission media, we are often called cable.
At present, the more common network cable divided into thin twisted-pair, fiber-optic cable, coaxial cable and coarse coaxial cable and so on.
1. Fiber optic cable Fiber optic cable is a new generation of transmission media, compared with the copper medium, fiber, whether in the security, reliability or network performance has been greatly improved. In addition, the bandwidth of optical fiber transmission is far beyond the copper cable, and its support of the maximum connection distance of more than two kilometers, is a necessary choice for the formation of large-scale networks. Because fiber optic cable has good electromagnetic interference, confidentiality, speed, high transmission capacity, so its price is also more expensive, rarely used in home occasions. At present, there are two different types of optical fiber, respectively, Single-mode fiber and multimode fiber (the so-called "mold" refers to a certain angle into the optical fiber of a beam of light). Multimode fiber is generally used in the same office building or in a relatively close area of the network connection. Single-mode fiber transmits data with higher quality and longer transmission distances, and is often used to connect offices or geographically dispersed networks.
If the use of fiber optic cable as a network transmission media, but also need to increase the optical transceiver and other equipment, so the cost of more investment in the general application of less.
2. Twisted pair Twisted pair is a flexible communication cable that contains paired insulated copper wires, which are characterized by low prices and are therefore widely used, such as our common telephone lines. According to the maximum transmission rate, the twisted pair can be divided into 3 classes, 5 types and Super 5 types. 3-type twisted pair of 10mb/s,5 can reach the 100mb/s, and the Super 5 class is up to 155mb/s above, can be suitable for the future needs of multimedia data transmission, it is recommended to use 5 or even Super 5-type twisted pair. Twisted pair can also be divided into shielded twisted pair (STP) and unshielded twisted pair (UTP). STP Twisted-Pair Although the rate is low (only 4mb/s), but anti-jamming than UTP twisted Cable strong, so the price is much more expensive, now this kind of twisted pair of cheap a few yuan a meter, expensive it may be more than more than 10 yuan to buy a meter. By contrast, UTP twisted-pair prices are generally around 1.1-meter yuan, relatively inexpensive. In addition, the commonly used 10m and 100m unshielded twisted pair of the popular term is 10base-t and 100base-t, you can often see in the market.
and twisted pair of matching the use of RJ45 crystal Head, for the production of twisted pair and Nic RJ45 interface between the connector, its quality is directly related to the stability of the entire network, can not be ignored.
3. Coaxial cable Coaxial cable is a kind of transmission medium that many friends are familiar with, it is a layer of insulating wire wrapped around the central copper conductor cable, its biggest feature is good anti-interference ability, transmission data stability, and the price is also cheap, so once widely used, such as closed-circuit television line. However, the coaxial cable used more, mainly because coaxial cable composed of bus structure network cost is low, but a single cable damage may cause the entire network paralysis, maintenance is difficult, this is its biggest disadvantage. The coaxial cable used in Ethernet is mainly divided into coarse coaxial cable (10BASE5) and fine coaxial cable (10BASE2). Now the coarse coaxial cable is not used much, and there are some markets for the thin coaxial cable. Fine coaxial cable general market price a few yuan a meter, not too expensive. In addition, coaxial cable is used to connect with BNC head, the market to sell coaxial cable is generally and BNC head connected to the finished product, we can directly choose.