A communication channel is an integral part of every information transfer system . In the general case, this concept conceals a set of devices that are designed to provide signal transmission with certain properties from one point to another.
The communication channel contains such an important detail as the communication line through which electromagnetic waves transmitted from the transmitter to the receiver are transmitted. What does it mean? One channel in the General case may contain a number of lines. You can say about the opposite moment. Typically, the same communication line is simultaneously included in a number of channels. But that is not all. In addition to lines, equipment that is mounted at intermediate and final points is included in the composition of the channels. Depending on the task, the same devices can belong to different elements.The classification of communication channels is carried out according to various criteria: the technical nature of the signals, the purpose of the system, the lines used, and other parameters.
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And in that case, if we consider the communication channel, all the characteristics are set. After all, they are usually standardized and described in great detail, and their type does not depend on anything at all. To a certain extent, the communication line is similar to the railway, and the channel in this case is comparable to a carriage with a clearly defined payload.There is another concept. A dedicated communication channel is an element with a fixed bandwidth and bandwidth that constantly connects a pair of subscribers. Subscribers can be individual devices or entire networks. This type is usually rented from companies, and large corporations can build their own.
The communication channel can be analog or digital, and it is selected depending on what needs the subscriber is experiencing. In the case of a "dedicated" company focuses on a certain level of needs. Different lines are used to organize channels.