Week 2 : Data Communication

What is data communication?

Data communication happened between two devices that are connected by a point-to-point transmission medium. 

Data transmission.

• Data transmitted over the network can be in various ways.
• Factors that affect data transmission are bandwidth, types of signals, transmission type and timing and delivery method. 
• Bandwidth is amount of data that can be transferred in a given time period. Bandwidth can be measured by bits per second. 
• There are two types of signal in data transmission, they are analog and digital signals. 
• For analog, the data represent in continuous waves form. 
• there are two types of data transmission, serial transmission and parallel transmission. 

Source : https://www.slideshare.net/nisreenbmadanat/digital-communication-systems-28574971

• After data is sent, the reconstruction of data happened by synchronous transmission, asynchronous transmission, and isochronous transmission. 
• Synchronous is widely used and data comes in groups or blocks forms. 
• Whereas asynchronous is not widely used and there is a start bit and stop bit. 
• Isochronous is data sent at the same time, there is also initial communication to determine the bandwidth and other factors needed for data transmission. 
• There are three direction of transmission. 

Source : http://www.camiresearch.com/Data_Com_Basics/data_com_tutorial.html

• Last but not least is delivery method. In this part, there are three types of delivery method. Firstly, circuit switching, secondly packet switching and thirdly broadcasting.