Posted by | Posted in Custom Software, Enterprise Software, IT news | Posted on 27-04-2011
There will be no exaggeration to say that one of the most important issues for any business is information. Also the transfer of data to the persons concerned is important. Communication between computers was faster and easier to make computer networks. Offers not only a faster communication, it allows users access to Remoteprogramme and remote databases from the same undertaking or other organizations.
Apart from that there are other reasons for computer networks use. Over computer networks, hardware and software resource sharing and the reduction of microcomputer based networks instead of central computers costs can be reduced by the. Collect information from multiple resources, simplified the reliability of the data provided.
According to the definition of computer networks is nothing but the process of connecting multiple computers to the communication, so that the information and resources of all connected devices could be shared.
Categorization of computer networks can be as media communication, scale, topology network used on a variety of functions, communication protocol, and so on.
Use media of computer networks
A medium is inevitable for the communication between two devices. There are more than one medium, the electrical cables, fiber optic and radio waves are used for networks. Electrical and optical fiber are in wireline technology used during radio waves wireless technology.
Wireline technology is twisted-pair cable the medium in most commonly used for communication. Twisted-pair cable consists of metal wire that are twisted pairs. Wireless computer networks 4 contains few wires that are used for data and voice. Using twisted objectives through electromagnetic induction and crosstalk caused to minimize noise. There are two pairs of wires twisted, i.e. unshielded twisted pair, and twisted-pair. The twisted-pair cable speed range 2 million bits per second at 10 billion bits per second.
Another in wireline technology is a coaxial cable. It is mainly for local networks, cable-TV systems, etc. He is made of wire, coated layer of flexible material with a high dielectric constant, are enclosed by a conductive layer of isolation. The insulating layer on objectives, to minimize noise and signals.
Optical fiber is invented in the second half of the 20th century, the other means of communication. Its components are filaments of glass fiber coated with layers of protection and which transfers data with pulses of light. It carries the light signals over long distances. Electromagnetic signals can be affected, which transported it. Maximum transmission speed may reach trillions of bits per second.
For all types of dysfunction of the cable, the network support is provided by numerous service providers.
There are several wireless technologies that are widely used, such as the wireless LAN technology, satellite communications technology, infrared communication technology, terrestrial microwave, etc.
Wireless LAN technology employs hi frequency that is similar to digital mobile phones, low-frequency radio technology. This spread spectrum technology connects multiple devices in a limited area. In an Office or home wireless LAN could be solved easily with the help of many providers of PC support.
Communications satellites use microwave as a means to communicate signals, because microwave radio signals are less of the Earth’s atmosphere. Linguistic data, and television signals transmitted and received radio with microwave technology.
Infrared communication technology is used for the conveyance of signals between devices at a short distance. The maximum distance, which is the subject of this technology typically 10 meters.
Terrestrial microwave technology employs gigahertz, which limited the line of sight transmission range of signal low. The maximum distance between the stations of the relays for the microwave signal is 48 km.