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Elements of the communication

The main objective of any system is adapted to communication is to exchange information between two entities. A particular example of communication between a workstation and a server over a public telephone network. Another possible example is the exchange of voice signals between two telephones via the same network before. Key elements of this model are:Source or Transmitter (Sender). This device generates data to be transmitted, for example phones or personal computers.
Transmitter Power Syst. Transmission or destination channel receiver block diagram generally target System Theory System source of telecommunications

Transmitter. Transforms and encodes the information, generating electromagnetic signals
capable of being transmitted through atransmission system. For example, a modem converts the bit strings generated by a personal computer and converted into analog signals that can be transmitted through the telephone network.

Transmission system. You can be anything from a simple transmission line to a
complex network connecting the source to the destination.
Receiver. Accepts the signal from the transmission system and transformsit so that it can be handled by the target device. For example, a capture the analog modem network or transmission line and converted to a string of bits.

Destination (Consignee) ("Destination"). Take the data receiver.
Although the model presented above may seem simple, actually involves very complex. To get an idea of ​​the magnitude of it then a brief explanation of some of the key tasks tobe performed in a communication system.

Using the transmission system. Refers to the need to make effective use
resources used in the transmission, which typically are usually shared among a number of communication devices.
Attachment of the interface. For a device that can transmit will do so through the interface with the transmission medium.

Signal generation. This will be needed oncethe interface is established, the signal characteristics, such as the shape and intensity should be such that: 1) to be propagated through the transmission medium and 2) be performed at the receiver as data.

Synchronization. The signals must be generated not only considered to be met
requirements of the transmission system and the receiver, but should allow some way to synchronize the receiverand transmitter. The receiver must be able to determine when to begin and end the received signal. Also, you must know the duration of each signal element.

Exchange management. This is if you need to exchange data over a
period, the two parties (sender and receiver) must cooperate. In the devices for data processing, certain conventions are needed in addition to simply connect. Should beestablished when both devices are communication link Workstation Modem Modem Media Server simulcast transmission or whether they should make them in turn, must decide the amount and format of data transmitted each time, and must specify that do if they are given certain contingencies.

Detection and correction of errors. Is necessary in circumstances where there may be
tolerate errors is, when thetransmitted signal is distorted in some way before reaching its destination.

Flow control. Used to prevent the source does not saturate the transmitting destination
data faster than the receiver to process or absorb.

Addressing and routing. Used when a resource is shared by
more than two devices, the source system must somehow tell that share the identity of the destination. Thetransmission system must ensure that such a fate, and only that, it receives data.

Recovery. Is used when a transaction in a database or the
a file transfer is interrupted by a fault, the objective will therefore either be able to continue broadcasting from where the interruption occurred.

Elementos de la comunicación

El objetivo principal de todo sistema es adaptarse a la comunicación, es...