Data Communication 101 Communicating means sharing information, it may be remote or local. The definition of telecommunication means communicating at a distance. Data Communication is the exchange of information between devices via some form of transmission medium such as a wire cable. The potency of Information Communication system depends on three important features:. Delivery: This is when the message sent by the source System is correctly delivering to the right destination. Accuracy: The device must deliver the message correctly on the destination System, if any data transmitting to some other system gets altered and the same bits that are uncorrected are received on the destination system, it is of no use to see the message.
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Timeliness: The message must deliver the information in a timely manner. It is useless if the information is transmitted and delivered late to the destination systems.
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The five network components that Data Communication deals with are: Message: The message is data or the information to be transmitted or communicated form source system to the address system. This message is in the form of an image, audio, text, or a combination of these. Sender: The sender is the source system or device that sends the message. It can be a work station, a computer, phone etc. Receiver: The receiver is the destination system which gets the message from source system or sender device. It could be a computer, workstation, phone etc. Medium: A transmission medium is a physical path through which a message travels from sender device to the receiver device or from the source to destination system. Protocol: A protocol is set of regulations and rules that regulate the data communication. It represents a link establishment which will convey between the source systems and the destination system. Without this protocol the connection might not be established between destination system and the source system or between the sender and the receiver device. In communicating, data representing may be in pictures, text, images audio and video. The text is represented as bit patterns, a sequence of bits. Different sets of bits patterns have been designed to symbolize by text symbols. These data portrayal follow few standards: ASCII: The American-National-Standards-Institute (ANSI) developed a code called American-Standard-Code-for-Information-Interchange (ASCII). This code uses 7 bits for each symbol to represent it. Extended ASCII: This really is just like the ASCII but chooses 1bit more than ASCII code to create size of each pattern 1 byte (8- bits). This Extended ASCII adds zero to form a pattern of 1 byte, for example, 01111111. UNICODE: This Unicode was developed to understand a variety of languages, since before developed codes only comprehended English. A coalition of software and hardware design is known as Unicode. This is 16 bits and can represent up to 65536 symbols. ISO: This is International Organization for Standardization, they designed a code a pattern of 32 bits. Numbers & Images also use bit patterns, an image is divided into matrix of pixels.