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The idea from duplex it is used to name something that is double (that is, it has the same thing twice or twice as much). The term is used in different contexts.

It is called a duplex building containing two independent houses . These dwellings can be joined in parallel or placed one above the other. A duplex, therefore, has more than one floor or floor.

Each unit of a duplex has its own door. Beyond the private environments of each family , this type of buildings usually has common spaces for all owners, such as a garden or a patio.

"Duplex" it is also the title of a movie whose story takes place in a house of this class. With address of Danny De Vito and the performances of drew Barrymore and Ben Stiller , tells the adventures of a couple who have problems living with the neighbor who occupies the upper floor of the duplex.

In the field of communications , it is known as duplex to the system that can receive and send signals simultaneously . In this way, the messages circulate in two ways.

In order for a duplex to develop, it is necessary to have a means, medium that can carry out the transmission in both directions; a system that allows reception and simultaneous delivery; and a protocol in the terminal equipment organized by the communication. In general, all modern systems can operate in duplex since they allow receiving and sending signals simultaneously.

As possible to transmit in duplex mode in whole or in part, we can talk about the following categories of communications: simplex, half-duplex and duplex .

He duplex is also called full duplex, and is the most common today, as it allows channels able to send and receive data simultaneously. To achieve this simultaneity, it is possible to use different cables or appeal to the frequency multiplexing (the use of separate frequencies). It is expected that there will be no collisions in full duplex mode in Ethernet (a standard for local networks for computers that defines physical characteristics and data formats).

With respect to half-duplex , it is an alternate connection in which data can flow only in one direction, that is, it does not allow simultaneous reception and sending like the previous one. What benefit can it offer us, being that at first glance it is less "capable" than the full duplex? Well, it allows us to take advantage of the line one hundred percent in each transmission , since you should not use part of the frequency to send and part to receive.

A very easy example to understand is that of portable transceivers , also known as portable communicators or walkie-talkies, which cannot send and receive data simultaneously: each user must send their message , give the receiver the indication to start sending his own, and wait for the next turn.

Finally we have the simplex , which only offers the possibility of transmitting data in one direction. Although it may seem impractical, there are many cases in which it is not necessary for a system to send and receive information. In addition, its maintenance is simpler and its cost, much lower than the other two. Until a few decades ago, the optical fiber It was perhaps the most common example of simplex, although it is now possible to take advantage of different wavelengths to achieve duplex communication, something used by Internet providers.

Duplex, finally, is the denomination of a sexual practice which implies the participation of a man And two women. The duplex, in this framework, constitutes a trio .

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