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Switch is a adjective which is used to qualify what commutes : Replace, modify, replace or change something. As a noun, the idea of ​​a switch can refer to different devices.

A switch can be a device that allows a electric current change of driver . To meet this goal the switch makes the electrons Follow a different path.

The operation of these switches is similar to that of the switches . While the switches are responsible for disconnecting an electrical circuit, the switches make the current Go to another conductor to connect a different circuit.

In the field of telephony , the machine that is responsible for connecting different telephone lines is called a switch. Also know as switchboard , the switch allows two points to be linked by different nodes. In other words, the switch determines the path that establishes the communication between two users, said path remaining "occupied" until the communication in question ends.

Switching in the context of a telephone network is not a simple action, but is made up of different stages , and all of them must be successful for communication to take place. First is the connection request , which must be approved to go to call establishment ; then begins the stage in which the data transfer between the different nodes; finally, the connection release .

Let's look at some of the advantages of using a switch for telephone communication:

* the transmission takes place in real time, something indispensable for this type of communication. At present, it is possible to establish a connection that transmits data of audio and video in real time, something that we can appreciate in the so-called video calls;

* throughout each session, the nodes that participate in the communication have exclusive access to the resources, and this guarantees an acceptable level of quality;

* does not exist containment . This means that since the circuit is established, the nodes can transmit the data at the maximum speed allowed by the medium, and should not share the usage time or bandwidth;

* once the circuit It is not necessary to devote time to performing calculations and routing of those nodes that are among the main ones, since the switch allocates a specific physical circuit to each communication session. In this way, intermediate nodes receive a single route for packets, both for incoming and outgoing.

Of course, the switch also has certain disadvantages, such as the following:

* the beginning of the communication is not immediate, since it is necessary to dedicate a weather to the early stages, so that it is not possible to transmit the data until they have been exceeded;

* While the parties are not using the resources assigned to them, they are wasted;

* the communication path is fixed and this prevents it from being readjusted according to the needs of each connection;

* If an intermediate node has a fault, the entire circuit is dropped and the process must be restarted.

For the computing , a switch is a logical digital element that serves to interconnect different sections of the network. The switches carry the data from one segment to another according to the MAC address destination of the different existing frames in the network.

Thanks to a switch of this type, you can connect several sections of a net So that they merge. Because they only transmit the data to the segments in which there is a recipient, they improve the security and performance of the so-called local area networks.

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