Concentrator

In general, a concentrating (in English, hub - this translation is often used in French, but it is a Anglicisme ) is the central node of a Data-processing network. It is about an electronic device making it possible to create a local data-processing network of the type Ethernet.

Function

This apparatus allows the connection of several apparatuses on the same line of communication, several computers in a network Ethernet, or several peripherals on a port USB, by regenerating the signal, and by reflecting the data transmitted by one towards the others, making so that they form one node.

Ethernet

By using a concentrator, each equipment attached to this one divides same the Domaine of diffusion as well as same the Domaine of collision. As in any segment of network Ethernet, only one of the connected machines can transmit to it at the same time. In the contrary case, a collision occurs, the machines concerned owe retransmettre their screen S after having waited a time calculated by chance by each transmitter.

This device is a simple repeater of data not allowing particular protection of the data, in opposition to the Commutateur network ( switch ), which directs the data only towards the machine recipient. It also makes it possible to extend a lan (LAN), but does not allow to transform it into a wide area network (WAN);

The hub has two types of “physical ports”, or connectors:

  • ports for the connection of the machines;
  • the port for extension of the network to which another concentrator is connected (it has only one by concentrator in general of them there). This type of port is in fact identical to the precedent, except for the wiring which is reversed, (one can also use a cable RJ45 crossed to connect only one additional computer to it).

USB

A hub USB behaves in the same way that a hub Ethernet, only the connector industry is different.

See too

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