In the network hardware, there is another kind of not to ignore is the network transmission medium, we usually call the network line. Now, the comparison of the network cable is divided into two strands, fiber optic cable, coaxial cable and rough coaxial cable.
1. Fiber optic cable
Fiber optic cable is the transmission medium of the new generation. Compared with copper medium, optical fiber has made great progress in safety, reliability and network function. In addition, the bandwidth of optical fiber transmission is much higher than that of copper cable, and the maximum connection interval of the fiber is more than two kilometers, which is the inevitable choice for the larger planning network. Because fiber optic cable has the advantages such as good anti-electromagnetic interference, strong confidentiality, fast speed and large transmission capacity, its quotation is also more valuable, which is seldom used in domestic occasions. Today, there are two different types of optical fibers, single mode fiber and multimode fiber. Die & throughout; That is, a beam of light that enters the fiber with a certain point of view. Multimode fiber is usually used for network connection in the same office building or in a relatively close area. Single-mode fiber delivers higher quality, longer transmission intervals, and is often used to connect buildings or to a wider network. If the optical fiber optic cable is used as the network transmission medium, it needs to add the optical transceiver and other equipment, so the investment is larger and less used in the normal use.
2. The twisted pair
The twisted pair is a flexible communication cable, consisting of a pair of insulated copper wires, which are characterized by cheap quotes, so they are widely used, such as the telephone lines we see more often. According to the maximum transmission rate, the twisted pair can be divided into 3 categories, 5 classes and 5 classes. The rate of 3 kinds of twisted pair of 10 MB/s, 5 kinds of up to 100 MB/s, and the five types of more than 155 MB/s, able to fit the need of the multimedia data transmission in the future, so recommend to choose 5 classes and five types of twisted-pair cable. The twisted pair can also be divided into shielded twisted pair (STP) and unshielded twisted pair (utp). STP twisted-pair although rate is low (as long as the 4 MB/s), but the anti-interference than utp twisted-pair is strong, so the price also is much expensive, now this kind of twisted pair of cheap a few dollars a metre, expensive, maybe more than ten yuan to buy a meter. In contrast, the utp twisted-pair quotation is usually at the mercy of a meter and a low price. Other, commonly used 10m and 100m non-shielded double stranded wires are known as 10base-t and 100base-t, which we often see on the market. It also has rj45 crystal head, which is used to make the joint between the double stranded wire and the network card rj45 interface. The quality is directly related to the stability of the whole network, not to be ignored.
3. Coaxial cable
Coaxial cable is familiar with many brothers contrast type of transmission medium, it is made of layers of insulation copper conductor cable line around the center, it is the best feature of good anti-interference ability, stable data transmission, and the price is cheap, so had been widely used, such as closed-circuit television (CCTV) line. But once coaxial cable selection is more, primary because bus structure consisting of coaxial cable network capital is low, but a single cable damage may cause the entire network paralysis, maintenance is also hard for you, this is the biggest drawbacks. The coaxial cable used in Ethernet is primarily divided into coaxial cable (10base5) and fine coaxial cable (10base2). Nowadays, coaxial cable is not used much, and there are some stores in the coaxial cable. Fine coaxial cable is usually a few yuan a meter, not too expensive. Other, coaxial cable is used to connect with BNC head, the coaxial cable that sells in the market is the product that has connected with BNC head normally, we can choose directly.
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