data transmission mode: SSC and HSC Computer Science Part 1

Transmission Modes

Data transmission mode refers to the method by which data is transmitted between devices. There are several different modes of data transmission, including:

(i) Simplex: 

Data is transmitted in one direction only. An example of this is a radio broadcast.

An example of simplex data transmission would be a one-way radio broadcast, where a radio station sends a signal out to listeners but does not receive any input from them.

(ii) Half-duplex: 

Data can be transmitted in both directions, but not simultaneously. An example of this is a CB radio.

Data transmission mode refers to the method by which data is transmitted between devices. There are several different modes of data transmission, including:

An example of half-duplex data transmission would be a walkie-talkie, where two parties can communicate with each other but only one can speak at a time.

(iii) Full-duplex: 

Data can be transmitted in both directions simultaneously. An example of this is a telephone conversation.

An example of full-duplex data transmission would be a telephone conversation, where both parties can speak and listen at the same time.

Data Transmission Modes

(iv) Multiplexing: 

Multiple channels of data are transmitted over a single communication line simultaneously. An example of this is cable television, where many channels are transmitted over a single cable.

 An example of multiplexing would be cable television, where many channels of video and audio are transmitted over a single cable to a subscriber's home.

In addition to these modes, there are also various protocols that are used to control and optimize the data transmission, such as TCP/IP, ATM, HDLC, SONET, and Fibre Channel.

synchronous data transmission Vs asynchronous data transmission

It's also important to note that data transmission can be further classified as either Synchronous or Asynchronous. In Synchronous mode, data is transmitted in fixed-size blocks, at a steady and predictable rate. In Asynchronous mode, data is transmitted without the use of an external clock reference and without a steady rate.

Synchronous: 

An example of synchronous data transmission would be streaming video, where data is transmitted in fixed-size blocks with a steady and predictable rate.

Asynchronous: 

An example of asynchronous data transmission would be emailed, where data is transmitted without the use of an external clock reference, and without a steady rate.

Diagrammetrical Representation of Synchronous And Asynchronous Transmission