Local area network and plastic optical fiber media
2021-06-09
Local Area Network (LAN for short) refers to a group of computers interconnected by multiple computers and other devices in a certain area. They are not far away from each other in physical location to allow users to communicate with each other and share printers and storage. A system in which computing resources such as devices are interconnected together. It is generally used for the transmission of data and information between short-distance computers. It belongs to a small-scale network such as a factory and office established by a department or a unit. Its low cost, wide application, convenient networking, and flexible use are popular with users. , Is currently the most active branch in the development of computer networks. The local area network covers a limited geographical area, generally the distance is 0.1km to 25km. It is suitable for the networking needs of computers, terminals and various information processing equipment within a limited range of institutions, companies, campuses, military camps, and factories. The local area network has a higher data transmission rate and a low bit error rate. Its transmission rate is generally 1Mb/s to 1000Mb/s, and its bit error rate is generally between 10-8 and 10-11. A local area network is generally owned by a unit and is easy to establish, maintain, and expand. The transmission medium usually used in the local area network is coaxial cable, twisted pair, etc. to establish the internal dedicated line of the unit. The local area network focuses on the processing of shared information. The construction of a local area network includes servers, workstations, transmission media, and network equipment. Common types of local area networks include: Ethernet (Ethernet), Fiber Distributed Data Interface (FDDI), Asynchronous Transfer Mode (ATM), Token Ring, Switching, etc. To Almost all local area networks today are built on copper media (coaxial cable or twisted pair). To meet the more stringent requirements of asynchronous transfer mode (ATM) communications, copper wire networks require expensive electronic components to maintain signal strength and integrity. In addition, copper wires are susceptible to electromagnetic interference and eavesdropping, which is not suitable in environments with high security requirements. To Nevertheless, copper wire is still a widely used technology for a long time because there is no low-cost alternative. Because of the high connection cost of quartz optical fiber, it is almost impossible to achieve fiber to the table (FTTD). But now, the spread of new technology makes plastic optical fiber very attractive in local area networks. Very simple, the installation labor cost of plastic optical fiber is lower than that of copper wire and quartz optical fiber. Plastic optical fiber is more versatile and a permanent solution to achieve high bandwidth and low cost. For example, with PMMA plastic optical fiber, 100 Mbps can be achieved for 100 meters. In short, plastic optical fiber has become the next-generation standard local area network transmission medium.
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