At present, the wiring system materials usually use cable and fiber optic cable as the transmission medium. The types of cables are mainly divided into shielded twisted pair and unshielded twisted pair. The fiber is also divided into multimode fiber and Single mode fiber. Fiber optic cable has the advantages of strong anti-interference performance, long transmission distance and high security.
First: unshielded twisted pair UTP is the most widely used wiring system in China. It is suitable for network applications with transmission bandwidth below 250MHz and no special performance requirements. Its advantages are good overall performance, low price, convenient construction and maintenance. . Category 6 cabling systems have reached the performance limits of unshielded twisted pair.
Second, the aluminum foil shielded twisted pair FTP has a large bandwidth and strong anti-interference performance, and has the characteristics of low smoke and no halogen. In contrast, the shielded wire has a higher price and installation cost than the unshielded wire, and the cable bending performance is slightly worse. This type is used in Category 6 and previous shielding systems.
Third, optical cables, especially single-mode optical cables, can be used for high-speed network transmission, and have the advantages of innate electromagnetic interference immunity, high reliability, and support for long-distance transmission. They are ideal network transmission media in the future, and their status is increasingly important. However, optical cable equipment, materials and termination costs are relatively expensive and the installation is relatively complicated, so it is generally suitable for long-distance and large-capacity wiring. At present, 62.5/125μm multimode optical cable has become the mainstream wiring medium in the integrated wiring trunk system, and its application in horizontal systems has become increasingly widespread.
Fourth, the independent shielded twisted pair STP, each pair of wires has an aluminum foil shielding layer, four pairs of wires together and a common metal braided shielding layer, which is the standard structure of the seven types of network cables. It is suitable for high-speed network applications, providing highly secure transmission, supporting future new applications, helping to unify the wiring platform of current network applications, enabling all kinds of information from email to multimedia video to be in the same high-speed system. In transit. The extra shield makes the Category 7 line have a larger wire diameter. These features require special care when designing the routing and termination space, leaving a large amount of space and a large bend radius. Moreover, due to its excellent shielding design and high bandwidth, a typical seven-channel channel can even provide a pair of 862MHz bandwidth for transmitting cable TV signals, analog audio signals for another pair, and then third. Four-wire pair transmission of high-speed LAN information. This kind of application is unimaginable at present, but will soon be implemented by a Category 7 cabling system.
Compared to fiber-optic LANs, the seven-category cable system solution provides the desired performance and bandwidth, but the overall cost is only a fraction of the fiber. Some people think that fiber optic systems can bring enough bandwidth to people, and fiber optic cable is close to the price of Category 7 cable. However, if the cost of fiber routers, optical switches, and optical network cards is taken into account, the price advantage of fiber will be quickly lost.
In summary, for the choice of network integrated wiring system, it is necessary to have different choices due to different needs, and it is a rational choice for oneself.