Sample data flow direction.The medium of communication. Intermediary or intermediaries in the delivery of data media or channel that is used to import the data from the source to the destination. To connect a variety of devices (victory square expensive Mon. 2547:10-11) can be divided into two major types include: 1. in a medium category with cable. 2. in a medium category wireless. Twisted pair cable is threaded 1.1 (twisted pair) consists of a copper wire covered with plastic insulation, 2 thousand twisted around to reduce the interference from electromagnetic waves from a line side within the same cable, or external, because this allows Helix twisted pair cables, electrical signals via high frequency. For data transmission via twisted pair cable spiral depends on the thickness of the wire is copper wire with large diameter will be able to send an electrical signal strength. Enables sending data with high rates. In General, for sending digital data. The signal that is sent is characterized by square wave. Twisted pair cable is threaded can use data to hundreds of megabits per second. In less than a hundred meters because of a twisted pair cable is threaded with very affordable rates. Using the data thus has its widespread use. For example, the (A) twisted pair cables, spiral type, shielded (Shielded Twisted Pair: STP) twisted pair cable is threaded with braided wire, thicker layer in order to prevent the interference of electromagnetic waves. (B) double corkscrew type not insulated (Unshielded Twisted Pair: UTP) twisted pair cable is threaded with thin outer insulation layer, making it easy to bend, but it can prevent the interference of electromagnetic waves were less than the first, but it has a lower price is used to connect devices in the network. An example of twisted pair cable is not shielded-type spiral seen in everyday life is the telephone cable that used to be in the House. 1.2 coaxial cable (coaxial) as the central link, that looks just like the cable that goes from the antenna. Coaxial cable is used, there are two general types of 50 ohm, which used to send digital data and type 75 Ohm, which used analog data transmission. The cable consists of a copper wire at the core one is covered with one layer of insulation, to prevent leakage current is then covered with a conductor, which is made from copper wire braid pigtail to prevent interference of electromagnetic waves and other noise. Before the outer cladding, plastic insulation. Pigtail wire braided copper is the part that makes this line-frequency electric signals can pass through very advanced and widely used as an analog signal communication links through the underwater and underground. 1.3 light guide fibers (fiber optic) are the core of the cable, which consists of a small plastic or glass fiber, many lines are combined. Each fibre has a size of only a trickle of hair and hollow inside, and the fibers are wrapped with fiber, another type of outer cladding before. The transmission of information through the medium of this type is different from other types, which are used to transmit electrical signals, but the work of this type will use the laser medium, running through the chongkluang of each fiber lines and methodology used refractive glass-fibre outer layers, by a reflective mirror. Mobile Lighting glass pipe with the signal density rate is very high and is not disruptive of electromagnetic waves. Currently if using fiber optics with Ethernet systems are used by several hundred megabit speed. And due to data transmission with high density. Enables sending data, audio, video or graphics characters, all at the same time. It also has a high safety, however there is a disadvantage, because the twisting cables will cause broken fibres. Can't use this medium to travel in the building. Fiber light guide with special effects that are used for point to point links, making it ideal to be used with the link between terminals or between cities with the city. Fiber light guide is to use a wire core.
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