DATA Transmission Modes Explained ft. Simplex, Duplex, Synchronous, Asynchronous, Serial, Parallel

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DATA Transmission Modes Explained ft. Simplex, Duplex, Synchronous, Asynchronous, Serial, Parallel HorizonTech4You - https://goo.gl/sI6Swo Facebook - https://goo.gl/BgRPWj Twitter - https://goo.gl/bTSYL9 Google+ - https://goo.gl/FqtJiC Subscribe - https://goo.gl/sI6Swo A given transmission on a communications channel between two machines can occur in several different ways. The transmission is characterized by: the direction of the exchanges the transmission mode: the number of bits sent simultaneously synchronization between the transmitter and receiver Simplex, half-duplex and full-duplex connections There are 3 different transmission modes characterized according to the direction of the exchanges: A simplex connection is a connection in which the data flows in only one direction, from the transmitter to the receiver. This type of connection is useful if the data do not need to flow in both directions (for example, from your computer to the printer or from the mouse to your computer...) Simplex connection A half-duplex connection (sometimes called an alternating connection or semi-duplex) is a connection in which the data flows in one direction or the other, but not both at the same time. With this type of connection, each end of the connection transmits in turn. This type of connection makes it possible to have bidirectional communications using the full capacity of the line. Half-duplex connection A full-duplex connection is a connection in which the data flow in both directions simultaneously. Each end of the line can thus transmit and receive at the same time, which means that the bandwidth is divided in two for each direction of data transmission if the same transmission medium is used for both directions of transmission. Full-duplex connection Serial and parallel transmission The transmission mode refers to the number of elementary units of information (bits) that can be simultaneously translated by the communications channel. In fact, processors (and therefore computers in general) never process (in the case of recent processors) a single bit at a time; generally they are able to process several (most of the time it is 8: one byte), and for this reason the basic connections on a computer are parallel connections. Parallel connection Parallel connection means simultaneous transmission of N bits. These bits are sent simultaneously over N different channels (a channel being, for example, a wire, a cable or any other physical medium). The parallel connection on PC-type computers generally requires 10 wires. Parallel connection These channels may be: N physical lines: in which case each bit is sent on a physical line (which is why parallel cables are made up of several wires in a ribbon cable) one physical line divided into several sub-channels by dividing up the bandwidth. In this case, each bit is sent at a different frequency... Since the conductive wires are close to each other in the ribbon cable, interference can occur (particularly at high speeds) and degrade the signal quality... Serial connection In a serial connection, the data are sent one bit at a time over the transmission channel. However, since most processors process data in parallel, the transmitter needs to transform incoming parallel data into serial data and the receiver needs to do the opposite. Serial connection These operations are performed by a communications controller (normally a UART (Universal Asynchronous Receiver Transmitter) chip). The communications controller works in the following manner: The parallel-serial transformation is performed using a shift register. The shift register, working together with a clock, will shift the register (containing all of the data presented in parallel) by one position to the left, and then transmit the most significant bit (the leftmost one) and so on: parallel-serial transformation The serial-parallel transformation is done in almost the same way using a shift register. The shift register shifts the register by one position to the left each time a bit is received, and then transmits the entire register in parallel when it is full: serial-parallel transformation Synchronous and asynchronous transmission Given the problems that arise with a parallel-type connection, serial connections are normally used. However, since a single wire transports the information, the problem is how to synchronize the transmitter and receiver, in other words, the receiver can not necessarily distinguish the characters (or more generally the bit sequences) because the bits are sent one after the other. There are two types of transmission that address this problem:

DATA Transmission Modes Explained ft. Simplex, Duplex, Synchronous, Asynchronous, Serial, Parallel

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• published: 18 Jul 2016
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DATA Transmission Modes Explained ft. Simplex, Duplex, Synchronous, Asynchronous, Serial, Parallel HorizonTech4You - https://goo.gl/sI6Swo Facebook - https://goo.gl/BgRPWj Twitter - https://goo.gl/bTSYL9 Google+ - https://goo.gl/FqtJiC Subscribe - https://goo.gl/sI6Swo A given transmission on a communications channel between two machines can occur in several different ways. The transmission is characterized by: the direction of the exchanges the transmission mode: the number of bits sent simultaneously synchronization between the transmitter and receiver Simplex, half-duplex and full-duplex connections There are 3 different transmission modes characterized according to the direction of the exchanges: A simplex connection is a connection in which the data flows in only one direction, from the transmitter to the receiver. This type of connection is useful if the data do not need to flow in both directions (for example, from your computer to the printer or from the mouse to your computer...) Simplex connection A half-duplex connection (sometimes called an alternating connection or semi-duplex) is a connection in which the data flows in one direction or the other, but not both at the same time. With this type of connection, each end of the connection transmits in turn. This type of connection makes it possible to have bidirectional communications using the full capacity of the line. Half-duplex connection A full-duplex connection is a connection in which the data flow in both directions simultaneously. Each end of the line can thus transmit and receive at the same time, which means that the bandwidth is divided in two for each direction of data transmission if the same transmission medium is used for both directions of transmission. Full-duplex connection Serial and parallel transmission The transmission mode refers to the number of elementary units of information (bits) that can be simultaneously translated by the communications channel. In fact, processors (and therefore computers in general) never process (in the case of recent processors) a single bit at a time; generally they are able to process several (most of the time it is 8: one byte), and for this reason the basic connections on a computer are parallel connections. Parallel connection Parallel connection means simultaneous transmission of N bits. These bits are sent simultaneously over N different channels (a channel being, for example, a wire, a cable or any other physical medium). The parallel connection on PC-type computers generally requires 10 wires. Parallel connection These channels may be: N physical lines: in which case each bit is sent on a physical line (which is why parallel cables are made up of several wires in a ribbon cable) one physical line divided into several sub-channels by dividing up the bandwidth. In this case, each bit is sent at a different frequency... Since the conductive wires are close to each other in the ribbon cable, interference can occur (particularly at high speeds) and degrade the signal quality... Serial connection In a serial connection, the data are sent one bit at a time over the transmission channel. However, since most processors process data in parallel, the transmitter needs to transform incoming parallel data into serial data and the receiver needs to do the opposite. Serial connection These operations are performed by a communications controller (normally a UART (Universal Asynchronous Receiver Transmitter) chip). The communications controller works in the following manner: The parallel-serial transformation is performed using a shift register. The shift register, working together with a clock, will shift the register (containing all of the data presented in parallel) by one position to the left, and then transmit the most significant bit (the leftmost one) and so on: parallel-serial transformation The serial-parallel transformation is done in almost the same way using a shift register. The shift register shifts the register by one position to the left each time a bit is received, and then transmits the entire register in parallel when it is full: serial-parallel transformation Synchronous and asynchronous transmission Given the problems that arise with a parallel-type connection, serial connections are normally used. However, since a single wire transports the information, the problem is how to synchronize the transmitter and receiver, in other words, the receiver can not necessarily distinguish the characters (or more generally the bit sequences) because the bits are sent one after the other. There are two types of transmission that address this problem: